JP2013134299A - Development apparatus, process cartridge and resin conjugate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technology for reducing the number of decomposition processes in an image forming apparatus.SOLUTION: A development apparatus has: a first frame body 29 which supports a developer regulation member; a fixation member 52 which fixes the developer regulation member to the first frame body 29; and a second frame body 51 which is coupled to the first frame body 29 by a resin molding part 54 to be formed by injection of molten resin in a space which is formed at a junction with the first frame body 29, and supports a developer carrier, compatibility between the first frame body 29 and the resin molding part 54 is low so as to be freely separated from each other, the fixation member 52 has a first regulation part 52b which engages into the resin molding part 54 to regulate that the resin molding part 54 comes off from the first frame body 29, the second frame body 51 has a second regulation part 51i which regulates movement of the second frame body 51 to the resin molding part 54, and becomes separable from the first frame body 29 by a fact that the resin molding part 54 becomes separable from the first frame body 29 by a fact that regulation by the first regulation part 52b is eliminated.

Description

  The present invention relates to a developing device, a process cartridge, and a resin joined body in an image forming apparatus.

Conventionally, an electrophotographic image forming apparatus employs a process cartridge system in which an electrophotographic photosensitive member and process means acting on the electrophotographic photosensitive member are integrally formed into a cartridge, and the cartridge can be attached to and detached from the main body of the image forming apparatus. (See Patent Document 1). Here, the electrophotographic image forming apparatus (hereinafter referred to as an image forming apparatus) forms an image on a recording medium using an electrophotographic image forming process. Examples of the image forming apparatus include an electrophotographic copying machine, an electrophotographic printer (for example, an LED printer, a laser beam printer), an electrophotographic facsimile apparatus, an electrophotographic word processor, and the like. In addition, the process cartridge integrally includes an electrophotographic photosensitive drum (hereinafter referred to as a photosensitive drum) that is an image carrier and at least a developing roller that is a developer carrier as a process unit that acts on the photosensitive drum. It is a cartridge. The developing device is a cartridge in which the developer accommodating portion and the developing roller are integrally formed so as to be detachable from the image forming apparatus. The image forming apparatus main body is a part obtained by removing the process cartridge and the developing device from the image forming apparatus.
According to this process cartridge system, since the apparatus can be maintained by the user himself / herself without depending on the service person, the operability can be remarkably improved. For these reasons, the process cartridge system is widely used in image forming apparatuses.
The process cartridge is divided into a developing unit and a photosensitive drum unit. In the developing unit, a developer regulating member that regulates the developer layer on the developing roller is fixed to the developing frame that is the first frame by screws. Further, a bearing, which is a second frame that supports the developing roller, is fixed by screws at two ends of the first frame in the developing roller axial direction (hereinafter referred to as the longitudinal direction). As described above, the developing roller and the developer regulating member are positioned and integrated with each other.
As a method of fixing the second frame to the first frame, it is also known to use resin bonding instead of using screws in order to improve the space efficiency of the fixing portion. In this method, molten resin is poured between the first frame and the second frame, and the molten resin is cooled and solidified to fix the first frame and the second frame. Furthermore, a method is also known in which a protrusion is provided on the first frame, a molten resin is fixed to the protrusion, and the first frame and the second frame are more firmly fixed (see Patent Document 1).
In the photosensitive drum unit, a cleaning member that removes the developer on the photosensitive drum is fixed to a cleaning frame that is a first frame. Further, bearings that are the second frame for supporting the photosensitive drum are provided at two positions on both ends of the axial direction of the photosensitive drum of the first frame (which is the same as the developing roller axial direction, hereinafter referred to as the longitudinal direction). Secured with screws. Thus, the photosensitive drum and the cleaning member are positioned and integrated.
Also in the photosensitive drum unit, a method of fixing the second frame body to the first frame body using resin bonding is known as in the developing unit.
Such process cartridges are collected and recycled when the product lifetime is reached. In order to recycle, the development unit is disassembled into parts. Each disassembled part is sorted by material, recycled, and reused. Similarly, the photosensitive unit is also disassembled into parts. Each disassembled part is sorted by material, recycled, and reused.

JP 2006-44025 A

  However, if the process cartridge is to be disassembled into parts for recycling, the developing unit removes the second frame supporting the developing roller from the first frame and the developing blade from the first frame. In some cases, these two steps were required. Further, when resin bonding is used for fixing the second frame, an operation of cutting the second frame from the first frame is necessary. Similarly, in the photosensitive drum unit, there are cases where two steps, a step of removing the second frame supporting the photosensitive drum from the first frame and a step of removing the cleaning blade from the first frame, are necessary. Further, when resin bonding is used for fixing the second frame, an operation of cutting the second frame from the first frame is necessary.

  An object of the present invention is to provide a technique capable of reducing the number of decomposition steps in an image forming apparatus.

In order to achieve the above object, a developing device according to the present invention provides:
A developing device used in an image forming apparatus,
A developer carrying member carrying the developer;
A developer regulating member that regulates the amount of developer carried on the developer carrying body;
A first frame for supporting the developer regulating member;
A fixing member for fixing the developer regulating member to the first frame;
A second frame for supporting the developer carrier;
A resin molding part formed by injecting molten resin into a space formed by the first frame body and the second frame body, wherein the resin molding part is associated with the first restriction part of the fixing member protruding into the space. In combination, a resin molded portion that joins the first frame and the second frame,
A second restricting portion provided in the second frame, wherein the resin molded portion and the first restricting portion are disengaged to separate the first frame and the second frame. A second restricting portion for restricting the resin molded portion from moving from the second frame and allowing the resin molded portion to be separated from the first frame;
It is characterized by having.

In order to achieve the above object, a process cartridge according to the present invention comprises:
A process cartridge that can be attached to and detached from the main body of the image forming apparatus,
A photoreceptor,
A cleaning member for removing the developer from the photoreceptor;
A first frame that supports the cleaning member;
A fixing member that fixes the cleaning member to the first frame;
A second frame for supporting the photoreceptor;
A resin molding part formed by injecting molten resin into a space formed by the first frame body and the second frame body, wherein the resin molding part is associated with the first restriction part of the fixing member protruding into the space. In combination, a resin molded portion that joins the first frame and the second frame,
A second restricting portion provided in the second frame, wherein the resin molded portion and the first restricting portion are disengaged to separate the first frame and the second frame. A second restricting portion for restricting the resin molded portion from moving from the second frame and allowing the resin molded portion to be separated from the first frame;
It is characterized by having.

In order to achieve the above object, the resin joined body according to the present invention is:
A resin joined body in which the first frame body and the second frame body are coupled to each other;
A fixing member for fixing a component supported by the first frame to the first frame;
A resin molding part formed by injecting molten resin into a space formed by the first frame body and the second frame body, wherein the resin molding part is associated with the first restriction part of the fixing member protruding into the space. In combination, a resin molded portion that joins the first frame and the second frame,
A second restricting portion provided in the second frame, wherein the resin molded portion and the first restricting portion are disengaged to separate the first frame and the second frame. A second restricting portion for restricting the resin molded portion from moving from the second frame and allowing the resin molded portion to be separated from the first frame;
It is characterized by having.

  According to the present invention, it is possible to reduce the number of decomposition steps in the image forming apparatus.

Explanatory drawing of the fixing method of the image development frame and non-driving side bearing in the Example of this invention 1 is a schematic sectional view of an image forming apparatus according to an embodiment of the present invention. Schematic cross-sectional view of a process cartridge according to an embodiment of the present invention The perspective view which looked at the process cartridge which concerns on the Example of this invention from the non-driving side The perspective view which looked at the developing device concerning the example of the present invention from the non-driving side Positioning explanatory drawing of the developing device frame and the non-driving side bearing in the embodiment of the present invention The enlarged view which looked at the image development frame in the Example of this invention from the front of the image development blade. Explanatory drawing of the fixing method of the image development frame and non-driving side bearing in the Example of this invention Explanatory drawing of the disassembling method of the developing device frame and the non-driving side bearing in the embodiment of the present invention Explanatory drawing of the disassembling method of the developing device frame and the non-driving side bearing in the embodiment of the present invention

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the invention is applied and various conditions. That is, it is not intended to limit the scope of the present invention to the following embodiments.

Example 1
[General description of image forming apparatus]
Embodiment 1 of the present invention will be described below with reference to the drawings. In the following embodiments, a full-color image forming apparatus in which four process cartridges can be attached and detached is illustrated as an image forming apparatus. Note that the number of process cartridges attached to the image forming apparatus is not limited to this. It is appropriately set as necessary. For example, in the case of an image forming apparatus that forms a monochrome image, the number of process cartridges attached to the image forming apparatus is one. In the embodiments described below, a printer is exemplified as one aspect of the image forming apparatus.

[Schematic configuration of image forming apparatus]
FIG. 2 is a schematic sectional view of the image forming apparatus according to the embodiment of the present invention. As shown in FIG. 2, the image forming apparatus 1 is a four-color full-color laser printer using an electrophotographic image forming process, and forms a color image on a recording medium S. The image forming apparatus 1 is a process cartridge type, and a process cartridge is detachably attached to the image forming apparatus main body 2 to form a color image on the recording medium S.

Here, regarding the image forming apparatus 1, the side on which the front door 3 is provided is the front surface (front surface), and the surface opposite to the front surface is the back surface (rear surface). Further, when the image forming apparatus 1 is viewed from the front, the right side is referred to as a driving side, and the left side is referred to as a non-driving side. FIG. 2 is a cross-sectional view of the image forming apparatus 1 as viewed from the non-driving side. The front side of the paper is the non-driving side of the image forming apparatus 1, the right side of the paper is the front of the image forming apparatus 1, and the back side of the paper is the driving of the image forming apparatus 1. Become the side.

  The image forming apparatus main body 2 includes four process cartridges P (PY, PM, PC, and PK), which are a first process cartridge PY, a second process cartridge PM, a third process cartridge PC, and a fourth process cartridge PK. It is arranged horizontally. Each of the first to fourth process cartridges P (PY, PM, PC, PK) has the same electrophotographic image forming process mechanism, and the color of the developer is different. The first to fourth process cartridges P (PY / PM / PC / PK) receive a rotational driving force from a drive output unit (not shown) of the image forming apparatus main body 2. A bias voltage (charging bias, developing bias, etc.) is supplied from the image forming apparatus body 2 to each of the first to fourth process cartridges P (PY, PM, PC, PK) (not shown).

  FIG. 3 is a schematic cross-sectional view of the process cartridge P according to the embodiment of the present invention. As shown in FIG. 3, each of the first to fourth process cartridges P (PY, PM, PC, and PK) of this embodiment is a photosensitive drum 4 and a process unit that acts on the photosensitive drum 4. The cleaning unit 8 includes a charging unit and a cleaning unit. Each of the first to fourth process cartridges P (PY, PM, PC, PK) includes a developing device 9 including a developing unit that develops the electrostatic latent image on the photosensitive drum 4. The cleaning unit 8 and the developing device 9 are coupled to each other. Further, a charging roller 5 is used as the charging means, a cleaning blade (cleaning member) 7 is used as the cleaning means, and a developing roller 6 is used as the developing means. A more specific configuration of the process cartridge will be described later.

  The first process cartridge PY contains a yellow (Y) developer in the developer accommodating portion 49 of the developing frame 29 and forms a yellow developer image on the surface of the photosensitive drum 4. The second process cartridge PM contains a magenta (M) developer in the developer containing portion 49 of the developing frame 29 and forms a magenta developer image on the surface of the photosensitive drum 4. The third process cartridge PC accommodates cyan (C) developer in the developer accommodating portion 49 of the developing frame 29, and forms a cyan developer image on the surface of the photosensitive drum 4. The fourth process cartridge PK contains a black (K) developer in the developer containing portion 49 of the developing frame 29 and forms a black developer image on the surface of the photosensitive drum 4.

  Above the first to fourth process cartridges P (PY, PM, PC, PK), a laser scanner unit LB as an exposure unit is provided. The laser scanner unit LB outputs a laser beam Z corresponding to the image information. Then, the laser beam Z passes through the exposure window 10 of the process cartridge P and scans and exposes the surface of the photosensitive drum 4.

  Below the first to fourth process cartridges P (PY, PM, PC, PK), an intermediate transfer belt unit 11 as a transfer member is provided. The intermediate transfer belt unit 11 includes a driving roller 13, a turn roller 14, and a tension roller 15, and a transfer belt 12 having flexibility is stretched over the intermediate transfer belt unit 11.

The lower surface of the photosensitive drum 4 of each of the first to fourth process cartridges P (PY, PM, PC, PK) is in contact with the upper surface of the transfer belt 12. The contact portion is a primary transfer portion. A primary transfer roller 16 is provided inside the transfer belt 12 so as to face the photosensitive drum 4. A secondary transfer roller 17 is brought into contact with the turn roller 14 via the transfer belt 12. A contact portion between the transfer belt 12 and the secondary transfer roller 17 is a secondary transfer portion. A feeding unit 18 is provided below the intermediate transfer belt unit 11. The feeding unit 18 includes a paper feeding tray 19 and a paper feeding roller 20 in which the recording media S are stacked and stored.

  A fixing unit 21 and a discharge unit 22 are provided at the upper left in the image forming apparatus main body 2 in FIG. The upper surface of the image forming apparatus main body 2 is a discharge tray 23. The recording medium S is fixed with a developer image by a fixing unit provided in the fixing unit 21 and is discharged to a discharge tray 23.

[Image forming operation]
The operation for forming a full-color image is as follows. The photosensitive drum 4 of each of the first to fourth process cartridges P (PY / PM / PC / PK) is rotationally driven at a predetermined speed (in the direction of arrow D in FIG. 3, counterclockwise in FIG. 2). The transfer belt 12 is also rotationally driven at a speed corresponding to the speed of the photosensitive drum 4 in the forward direction (direction of arrow C in FIG. 2) with respect to the rotation of the photosensitive drum. The laser scanner unit LB is also driven. In synchronization with the driving of the laser scanner unit LB, the charging roller 5 uniformly charges the surface of the photosensitive drum 4 to a predetermined polarity and potential in each process cartridge. The laser scanner unit LB scans and exposes the surface of each photosensitive drum 4 with a laser beam Z according to the image signal of each color. As a result, an electrostatic latent image corresponding to the image signal of the corresponding color is formed on the surface of each photosensitive drum 4. The formed electrostatic latent image is developed by a developing roller 6 that is rotationally driven at a predetermined speed (in the direction of arrow E in FIG. 3, clockwise in FIG. 2).

  By the electrophotographic image forming process as described above, a yellow developer image corresponding to the yellow component of the full color image is formed on the photosensitive drum 4 of the first process cartridge PY. Then, the developer image is primarily transferred onto the transfer belt 12. Similarly, a magenta developer image corresponding to the magenta component of the full-color image is formed on the photosensitive drum 4 of the second process cartridge PM. The developer image is primary-transferred superimposed on the yellow developer image already transferred onto the transfer belt 12. Similarly, a cyan developer image corresponding to the cyan component of the full-color image is formed on the photosensitive drum 4 of the third process cartridge PC. Then, the developer image is primary-transferred superimposed on the yellow and magenta developer images already transferred onto the transfer belt 12. Similarly, a black developer image corresponding to the black component of the full color image is formed on the photosensitive drum 4 of the fourth process cartridge PK. Then, the developer image is primary-transferred superimposed on the yellow, magenta, and cyan developer images already transferred onto the transfer belt 12. In this way, a four-color full-color unfixed developer image of yellow, magenta, cyan, and black is formed on the transfer belt 12.

  On the other hand, the recording medium S is separated and fed one by one at a predetermined control timing. The recording medium S is introduced into a secondary transfer portion that is a contact portion between the secondary transfer roller 17 and the transfer belt 12 at a predetermined control timing. Thus, the four color superimposed developer images on the transfer belt 12 are sequentially and collectively transferred onto the surface of the recording medium S while the recording medium S is conveyed to the secondary transfer unit.

[Overall configuration of process cartridge]
FIG. 4 is a perspective view of the process cartridge P according to the embodiment of the present invention as viewed from the non-driving side. In the present embodiment, the first to fourth process cartridges P (PY, PM, PC, PK) have the same electrophotographic process mechanism, and the developer color and developer filling amount stored therein are the same. Each is different. The process cartridge P includes a photosensitive drum 4 and process means that acts on the photosensitive drum 4. Here, the process means includes a charging roller 5 as a charging means for charging the photosensitive drum 4, and a developer carrying body for carrying and transporting the developer as a developing means for developing the latent image formed on the photosensitive drum 4. The developing roller 6 is included. Also included is a cleaning blade 7 as a cleaning means for removing residual developer remaining on the surface of the photosensitive drum 4 (on the photosensitive member). The process cartridge P is divided into a drum unit 8 and a developing device 9 (hereinafter, developing unit 9). FIG. 5 is a perspective view of the developing device 9 according to the embodiment of the present invention as seen from the non-driving side.

[Drum unit configuration]
As shown in FIGS. 3 and 4, the drum unit 8 includes a photosensitive drum 4, a charging unit 5, a cleaning blade 7, a cleaning frame 26, a waste developer storage unit 27, and cartridge cover members 24 and 25. The photosensitive drum 4 is rotatably supported by a driving side cartridge cover member 24 and a non-driving side cartridge cover member 25 provided at both longitudinal ends of the process cartridge P. Here, the axial direction of the photosensitive drum 4 is defined as the longitudinal direction. The cartridge cover members 24 and 25 are fixed to the cleaning frame body 26 at both ends in the longitudinal direction of the cleaning frame body 26. As shown in FIG. 4, a coupling member 4 a for transmitting a driving force to the photosensitive drum 4 is provided on one end side in the longitudinal direction of the photosensitive drum 4. The coupling member 4 a is engaged with a coupling (not shown) as a drum drive output unit of the apparatus main body, and a driving force of a drive motor (not shown) of the apparatus main body is transmitted to the photosensitive drum 4. The charging roller 5 is supported by the cleaning frame 26 so as to be in contact with the photosensitive drum 4 and be driven to rotate. Further, the cleaning blade 7 is fixed to the cleaning frame 26 with screws so as to come into contact with the peripheral surface of the photosensitive drum 4 with a predetermined pressure. The residual transfer developer removed from the peripheral surface of the photosensitive drum 4 by the cleaning 7 is stored in a waste developer storage portion 27 in the cleaning frame 26. The cartridge cover members 24 and 25 are provided with support holes 24a and 25a for supporting the developing unit 9 so that the developing unit 9 is swingable (movable). These support holes 24a and 25b are rotatably engaged with the cylindrical portion 32a of the developing cover member 32 (see FIG. 5) on the driving side of the developing unit 9 and the swing shaft 51k of the non-driving side bearing 51, respectively. ing.

[Positioning of development frame and bearing]
Next, a method for positioning and fixing the non-driving side bearing 51 and the developing frame 29 will be described. The developing frame 29 and the non-driving side bearing 51 are configured such that a molten resin filling space is formed at a joint portion between them, and the resin formed by solidifying the molten resin injected into the filling space. They are connected to each other by the molding part. Hereinafter, the positioning method and the fixing method will be described using the first frame body as the developing frame body 29 and the second frame body as the non-driving side bearing 51 with reference to FIGS. 1, 6, 7, and 8. A similar configuration can be used for a positioning method and a fixing method of the developing frame 29 and the driving side bearing 50 (see FIG. 5) on the driving side.

  FIG. 6 is an enlarged view of the developing frame 29 on the non-driving side when the non-driving side bearing 51 is assembled. As shown in FIG. 6, the developing frame 29 to which the base metal plate 31b of the developing blade 31 is fixed has a positioning hole 29c, a rotation stop hole 29d, and a developing frame side long abutting surface 29e. The developing blade 31 is a developer regulating member that regulates the developer layer on the developing roller. Furthermore, the developing device frame 29 has an injection recess 29f that is an injection part into which molten resin can be injected. At the entrance of the injection recess 29f, the developing device frame side long abutting surface 29e is arranged in a cylindrical shape, and there is a notch 29g in which a part of the developing device frame side long abutting surface 29e is cut out. The non-driving side bearing 51 has a positioning boss 51a, a rotation-stop boss 51b, and a bearing-side longitudinal abutment surface 51c. Further, the non-driving side bearing 51 has a support hole 51e for supporting the developing roller 6 and an injection path 51d for guiding the molten resin.

When the non-driving side bearing 51 is assembled to the developing device frame 29, the positioning hole 29c and the positioning boss 51a are fitted, and the rotation stopping hole 29d and the rotation stopping boss 51b are fitted. Further, the non-driving side bearing 51 is positioned with respect to the developing frame 29 by closely contacting the developing frame side long abutting surface 29e and the bearing side long abutting surface 51c. At this time, the developing roller 6 is supported by the support hole 51 e of the non-driving side bearing 51 and positioned with respect to the developing blade 31. Further, the axial direction of the injection path 51 d of the non-driving side bearing 51 coincides with the axial direction of the injection recess 29 f of the developing frame 29.

[Method for fixing development frame and bearing (resin bonding method)]
Next, a resin bonding method for fixing the non-driving side bearing 51 to the developing frame 29 with a molten resin (resin molding portion 54) will be described. FIG. 7 is an enlarged view of the developing device frame 29 as seen from the front direction of the developing blade 31 (the arrow W direction in FIG. 6). 8 is a cross-sectional view of the molten resin injection path of the developing frame 29 and the non-driving side bearing 51 in the A direction in FIG. 8A is a cross-sectional view before assembling the developing blade 31 and the non-driving side bearing 51, and FIG. 8B is a cross-sectional view after the developing blade 31 and the non-driving side bearing 51 are assembled. FIG. 1 is a cross-sectional view in the A direction of FIG. 7 in a state in which a fixing molten resin is injected (a state where a resin molding portion 54 is formed).

  As shown in FIG. 8A, the non-driving side bearing 51 has an injection path 51d for guiding the molten resin in the direction of arrow Q in FIG. The diameter M of the upstream flow path in the arrow Q direction of the injection path 51d is larger than the diameter N of the downstream flow path. Further, the non-drive side bearing 51 has a second restricting portion 51i that restricts the molten resin injected into the injection path 51d. The second restricting portion 51i is a surface facing the direction in which the molten resin is injected (the direction of arrow Q in FIG. 8). That is, the injection path 51d has a portion that becomes narrower in the direction in which the molten resin is guided, and this portion regulates the movement of the non-driving side bearing 51 with respect to the resin molded portion 54 after the molten resin is solidified. The restricting part 51i is formed.

  The developing frame 29 has an injection recess 29f for receiving the molten resin injected in the direction of arrow Q in FIG. Further, a notch 29g is provided in a part of the inner surface of the injection recess 29f. Further, the developing device frame 29 has a non-driving side blade fixing hole (through hole) 29a in the direction of arrow J which intersects the direction in which the molten resin is injected (direction of arrow Q in FIG. 8A). Yes. The non-driving side blade fixing hole 29a penetrates (opens) the injection recess 29f. As shown in FIG. 8B, screws 52 as fixing members for fixing the base metal plate 31b of the developing blade 31 to the developing frame 29 are inserted into the non-driving side blade fixing holes 29a. When the screw 52 is inserted into the non-driving side blade fixing hole 29a and the base sheet metal 31b of the developing blade 31 is fixed to the developing frame 29, it protrudes into the injection recess 29f by a length L. This protruding portion is a part of the width U inside the injection recess 29f, and forms a width R portion that is narrower than the width U and is made of the bottom 52a of the screw 52 and the inner surface of the injection recess 29f. When the molten resin (not shown) is injected into the injection recess 29 after fixing the screw 52 to the developing frame 29 in this way, the portion protruding into the injection recess 29 of the screw 52 becomes the injected molten resin (not shown). It becomes the 1st control part 52b which controls (illustration). The first restricting portion 52b is in a state of being engaged with the resin molded portion 54 so that the resin molded portion 54 is restricted from being detached from the developing device frame 29 after the molten resin is solidified.

  As described above, when the non-driving side bearing 51 is positioned in the developing frame 29, the axial direction of the injection path 51d coincides with the axial direction of the injection recess 29f of the developing frame 29, and from the upstream side in the arrow Q direction. In order, the injection path 51d and the injection recess 29f are aligned with each other. At this time, the resin outlet 51g on the downstream side in the arrow Q direction of the injection path 51d is in the injection recess 29f in the arrow Q direction with respect to the abutment surface of the development frame body side long abutment surface 29e and the non-drive side bearing longitudinal abutment surface 51c. Only a depth X is inserted in. Furthermore, the distance T between the resin outlet outer 51h on the outer wall of the resin outlet 51g and the inner surface of the injection recess 29f is the width R between the bottom 52a of the screw 52 and the inner surface of the injection recess 29f, or the first restricting portion 52b of the screw 52. It is installed so as to be smaller than the width S with the inner surface of the injection recess 29f.

As shown in FIG. 1, when the developing blade 31 is fixed to the developing frame 29 with screws 52 and then molten resin is injected in the arrow Q direction from the resin injection port 51f upstream of the injection path 51d in the arrow Q direction, the molten resin is injected. Pass through the road 51d. The molten resin further passes between the bottom 52a of the screw 52 and the inner surface of the injection recess 29f (width R portion) and between the first restriction portion 52b of the screw 52 and the inner surface of the injection recess 29f (width S portion). Then, the injection path 51d and the injection recess 29f are filled. At this time, the second restricting portion 51i and the molten resin are in close contact with each other in the injection path 51d, and the first restricting portion 52b and the molten resin are in close contact within the injecting recess 29f. Further, the molten resin passes between the resin outlet exterior 51h and the inner surface of the injection recess 29f (width T portion), and is provided between the notch 29g and the developing frame 29 and the non-driving side bearing 51. 55, and a part of the buffer unit 55 is filled. Even when there is a variation in the amount of molten resin injected or a variation in the molding of the injection path 51d and the injection recess 29f, a large amount of molten resin is injected to reliably fill the injection path 51d and the injection recess 29f. That is, an amount of molten resin larger than the amount satisfying the maximum volume of the injection path 51d and the injection recess 29f flows through the injection path 51d and the injection recess 29f. The buffer portion 55 has a volume in which excess molten resin can be accommodated, and the molten resin does not leak from the buffer portion 55. Further, the space between the bottom 52a of the screw 52 and the inner surface of the injection recess 29f (width R portion) and the space between the first restriction portion 52b of the screw 52 and the inner surface of the injection recess 29f (width S portion) It is wider than the space between the inner surface of the injection recess 29f (width T portion). Thereby, molten resin flows into the width R part and the width S part before the width T part. Therefore, the molten resin does not pass through the width T portion and fill the buffer portion 55 before passing through the width R portion and the width S portion and filling the injection path 51d and the injection recess 29f. Further, since the developing frame side long abutting surface 29e and the non-driving side bearing longitudinal abutting surface 52c are in contact with each other, the molten resin does not leak to other portions.

  When the molten resin filling the injection path 51d and the injection recess 29f is cooled and solidified to form the resin molded portion 54, the second restricting portion 51i and the first locked portion 54a of the resin molded portion 54 are in close contact with each other, The non-driving side bearing 51 is restricted from moving in the direction of arrow V in FIG. Similarly, the first restricting portion 52b and the second locked portion 54b of the resin molding portion 54 are in close contact with each other, and the development frame 29 is restricted from moving in the direction of arrow Q in FIG. . Accordingly, the non-driving side bearing 51 cannot move in the direction of arrow V in FIG. 1 with respect to the developing device frame 29 and is coupled to the developing device frame 29.

  The resin used as the molten resin for forming the resin molded portion 54 is polyacetal (POM), and the molten resin melts at about 190 ° C. to 210 ° C., and solidifies when cooled to become the resin molded portion 54. The material of the developing frame 29 of the first frame and the non-driving side bearing 51 of the second frame is polystyrene (HIPS). The resin frame of the present invention is constituted by the developing frame 29, the non-driving side bearing 51 and the resin molding portion 54 made of the resin material. Since polystyrene (HIPS) has low compatibility with the polyacetal (POM) of the molten resin forming the resin molding portion 54, the materials do not melt together between the molten resin and the injection recess 29f of the developing frame 29, Hard to generate force. Further, when the molten resin reaches the inner surface of the injection recess 29f of the developing frame 29, the molten resin is melted so that the resin temperature is lower than the melting point of polystyrene (HIPS) forming the injection recess 29f of the developing frame 29. Resin is being injected. Therefore, since the inner surface of the injection recess 29f is not melted by the heat of the molten resin, the materials are not melted between the melt resin and the injection recess 29f of the developing frame 29, and a bonding force is hardly generated. As described above, since a bonding force is not easily generated between the resin molding portion 54 and the injection recess 29f of the developing device frame 29, they are separable. As described above, the non-driving side bearing 51 and the developing device frame 29 can be kept connected without being separated by the second restricting portion 51i and the first restricting portion 52b. In this embodiment, polyacetal (POM) and the developing frame 29 are used for the resin molded portion 54 and polystyrene (HIPS) is used for the non-driving side bearing 51. However, the material used for the resin molded portion 54 and the developing frame 29 is used. Other resin materials may be used as long as they have low compatibility and are separable. Further, the configuration is not limited to the above as long as at least a portion in contact with the resin molding portion 54 in the developing frame 29 is configured to have a melting point higher than the temperature of the injected molten resin.

As described above, in the present invention, the non-driving side bearing 51 is fixed to the developing frame 29 by bringing the resin molding portion 54 into close contact with the screw 52 that fixes the developing blade 31 to the developing frame 29. In this method, a conventional space for fixing the non-driving side bearing 51 to the developing frame 29 (screw fixing space or a conventional resin bonding space) and a fixing blade 31 for fixing the developing blade 31 to the developing frame 29 are provided. There is no need to provide separate spaces. Therefore, a smaller process cartridge can be provided.

  Also in the drum unit 8, the first frame can be used as the cleaning frame 26 and the second frame can be used as the cartridge cover members 24 and 25, and the same configuration can be used. Therefore, the developing frame 29 and the non-driving side bearing can be used. The configuration is not limited to 51 fixing.

[Development unit disassembly method]
Next, a method of disassembling the developing blade 31, the developing roller 6, and the non-driving side bearing 51 from the developing frame 29 will be described with reference to FIGS. Hereinafter, the developing frame 29 is used as the first frame, and the non-driving side bearing 51 is used as the second frame. However, the developing frame 29 is used as the first frame, and the driving bearing 52 is used as the second frame. However, it can be decomposed by the same decomposition method. FIG. 9 is a cross-sectional view of the molten resin injection portion of the developing frame 29 and the non-driving side bearing 51 in the direction of FIG. 7A when the screw 52 is removed from the developing frame 29. FIG. Before the non-driving side bearing 51 is separated from the frame 29, FIG. 9B shows the state after the separation. FIG. 10 is a perspective view of the developing unit 9 at the time of disassembly. As shown in FIGS. 9 and 10, when the screw 52 is removed from the non-driving side blade fixing hole 29a in the direction of the arrow Y in the axial direction of the non-driving side blade fixing hole 29a, the base sheet metal 31b becomes the developing frame body. 29, the developing blade 31 is detached from the developing frame 29. Then, when the non-driving side bearing 51 is moved in the V direction in the drawing, since the screw 52 has already been removed, the second restricting surface 52b acting on the second locked portion 54b of the resin molded portion 54 is eliminated. Therefore, the non-driving side bearing 51 is detached from the developing device frame 29. At this time, since the resin molded portion 54 and the injection recess 29f have low compatibility and can be separated from each other, the resin molding 54 and the injection recess 29f are not fixed. Further, since the first restricting surface 51 i and the first locked portion 54 a of the resin molding portion 54 are in close contact with each other, the resin molding portion 54 is detached from the developing frame 29 together with the non-driving side bearing 51. Then, the developing roller 6 supported by the non-driving side bearing 51 is removed from the non-driving side bearing 51.

  As described above, in the present embodiment, the coupling between the developing frame 29 and the non-driving side bearing 51 is released in one process such as removing the screw 52 that has fixed the developing blade 31 to the developing frame 29. That is, since the resin molded portion 54 can be separated from the developing frame 29 by eliminating the restriction of the screw 52 by the first restricting portion 52 b, the non-driving side bearing 51 can be separated from the developing frame 29. Thereby, the developing blade 31, the non-driving side bearing 51, and the developing roller 6 can be disassembled simultaneously from the developing frame 29. Therefore, the process of removing the non-driving side bearing 51 from the conventional developing frame 29 and the process of removing the developing blade 31 from the developing frame 29 can be reduced to one, thereby improving the process cartridge decomposability. Can be made.

  In the drum unit 8 as well, the first frame body can be used as the cleaning container 26 and the second frame body can be used as the cartridge cover members 24 and 25 and can be disassembled by the same disassembling method. In other words, the configuration is not limited to the disassembly of the developing frame 29 and the non-driving side bearing 51 in the developing unit 9.

  DESCRIPTION OF SYMBOLS 1 ... Electrophotographic image forming apparatus (image forming apparatus), 2 ... Apparatus main body, 6 ... Developing roller, 9 ... Developing unit, 29 ... Developing frame, 31 ... Developing blade, 51 ... Non-driving side bearing, 52 ... Screw, 54 ... Resin molding part

Claims (15)

A developing device used in an image forming apparatus,
A developer carrying member carrying the developer;
A developer regulating member that regulates the amount of developer carried on the developer carrying body;
A first frame for supporting the developer regulating member;
A fixing member for fixing the developer regulating member to the first frame;
A second frame for supporting the developer carrier;
A resin molding part formed by injecting molten resin into a space formed by the first frame body and the second frame body, wherein the resin molding part is associated with the first restriction part of the fixing member protruding into the space. In combination, a resin molded portion that joins the first frame and the second frame,
A second restricting portion provided in the second frame, wherein the resin molded portion and the first restricting portion are disengaged to separate the first frame and the second frame. A second restricting portion for restricting the resin molded portion from moving from the second frame and allowing the resin molded portion to be separated from the first frame;
A developing device comprising:   2. The developing device according to claim 1, wherein at least a portion in contact with the resin molding portion is made of a resin having a melting point higher than a temperature of the molten resin. The first frame has an injection part which is a part of the space filled with the molten resin, and a through hole into which the fixing member connected to the injection part is inserted,
The second frame has an injection port of the molten resin, and an injection path that is a part of the space for guiding the molten resin from the injection port to the injection portion,
The developing device according to claim 1, wherein the through hole extends in a direction intersecting a direction in which the molten resin is guided in the injection path.   The said 2nd frame has a part which becomes narrow toward the said injection | pouring part from the said injection hole in the said injection | pouring path, This part forms the said 2nd control part, It is characterized by the above-mentioned. The developing device according to 1.   The developing device according to claim 1, wherein the fixing member is a screw. A process cartridge that can be attached to and detached from the main body of the image forming apparatus,
A photoreceptor,
A cleaning member for removing the developer from the photoreceptor;
A first frame that supports the cleaning member;
A fixing member that fixes the cleaning member to the first frame;
A second frame for supporting the photoreceptor;
A resin molding part formed by injecting molten resin into a space formed by the first frame body and the second frame body, wherein the resin molding part is associated with the first restriction part of the fixing member protruding into the space. In combination, a resin molded portion that joins the first frame and the second frame,
A second restricting portion provided in the second frame, wherein the resin molded portion and the first restricting portion are disengaged to separate the first frame and the second frame. A second restricting portion for restricting the resin molded portion from moving from the second frame and allowing the resin molded portion to be separated from the first frame;
A process cartridge comprising: The process cartridge according to claim 6, wherein at least a portion of the first frame that is in contact with the resin molding portion is made of a resin having a melting point higher than a temperature of the molten resin. The first frame has an injection part which is a part of the space filled with the molten resin, and a through hole into which the fixing member connected to the injection part is inserted,
The second frame has an injection port of the molten resin, and an injection path that is a part of the space for guiding the molten resin from the injection port to the injection portion,
The process cartridge according to claim 6, wherein the through hole extends in a direction intersecting a direction in which the molten resin is guided in the injection path.   The said 2nd frame has a part which becomes narrow toward the said injection | pouring part from the said injection hole in the said injection | pouring path, This part forms the said 2nd control part, It is characterized by the above-mentioned. Process cartridge according to.   The process cartridge according to claim 6, wherein the fixing member is a screw. A resin joined body in which the first frame body and the second frame body are coupled to each other;
A fixing member for fixing a component supported by the first frame to the first frame;
A resin molding part formed by injecting molten resin into a space formed by the first frame body and the second frame body, wherein the resin molding part is associated with the first restriction part of the fixing member protruding into the space. In combination, a resin molded portion that joins the first frame and the second frame,
A second restricting portion provided in the second frame, wherein the resin molded portion and the first restricting portion are disengaged to separate the first frame and the second frame. A second restricting portion for restricting the resin molded portion from moving from the second frame and allowing the resin molded portion to be separated from the first frame;
A resin joined body characterized by comprising:   The resin joined body according to claim 11, wherein at least a portion in contact with the resin molding portion is made of a resin having a melting point higher than the temperature of the molten resin. The first frame has an injection part which is a part of the space filled with the molten resin, and a through hole into which the fixing member connected to the injection part is inserted,
The second frame has an injection port of the molten resin, and an injection path that is a part of the space for guiding the molten resin from the injection port to the injection portion,
The resin joined body according to claim 11 or 12, wherein the through hole extends in a direction intersecting a direction in which the molten resin is guided in the injection path.   The second frame body has a portion whose width becomes narrower from the injection port toward the injection portion in the injection path, and the portion forms the second restricting portion. The resin joined body described in 1.   The resin joined body according to any one of claims 11 to 14, wherein the fixing member is a screw.

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