JPH09127851A - Process cartridge and electrophotographic image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the operability of a protection cover provided on a process cartridge such as a drum cartridge to be exchanged by user. SOLUTION: When the cartridge C is pushed into a device main body, it is stopped in a state that only the protection cover 14 is not pushed into because the interference part 14b1 of the cover 14 abuts on the device main body. As the result, the loading of the cartridge is finished in the state where the cover 14 is made to project. Thus, the visibility and the operability of the user are enhanced. Besides, the releasing state of a developing unit is surely held when the cartridge is inserted by guiding the projected line 14b of the cover 14 by a groove provided on the developing unit and pressing it by an obliquely provided projected line 14c. Since the cover 14 is pulled out while the projected line 14b is guided, the cover 14 is hardly deformed and such possibility that a photoreceptor drum is damaged by the cover 14 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process cartridge and an electrophotographic image forming apparatus of an electrophotographic image forming apparatus adopting an electrophotographic system such as a laser printer and a copying machine.

Here, the electrophotographic electrophotographic image forming apparatus is
An image is formed on a recording medium by using an electrophotographic image forming process, such as an electrophotographic copying machine, an electrophotographic printer (for example, an LED printer, a laser beam printer, etc.), an electrophotographic facsimile machine, and an electrophotographic word processor. Is included.

As the process cartridge, a charging means, a developing means or a cleaning means and an electrophotographic photosensitive member are integrally made into a cartridge, and the cartridge can be attached to and detached from the main body of the electrophotographic image forming apparatus. Also, at least one of the charging means, the developing means, and the cleaning means and the electrophotographic photosensitive member are integrally made into a cartridge which can be attached to and detached from the main body of the electrophotographic image forming apparatus. Furthermore, it means that at least the developing means and the electrophotographic photosensitive member are integrally made into a cartridge and can be attached to and detached from the main body of the electrophotographic image forming apparatus (hereinafter referred to as the image forming apparatus main body).

In the following description, the longitudinal direction means the direction intersecting with the conveying direction of the recording medium, and the lateral direction means the direction intersecting with the longitudinal direction, both of which are mainly used in the part relating to the process cartridge.

[0005]

The present invention is a further development of the prior art described below.

The present invention relates to a process cartridge in which a protective cover for protecting an electrophotographic photosensitive member is removably provided, and a process cartridge and an electronic device in which the protective cover is easily removed when the process cartridge is attached to the main body of the electrophotographic image forming apparatus. An object is to provide a photographic image forming apparatus.

Another object of the present invention is to provide a reliable means for holding the protective cover when the protective cover is removed.

Further, the present invention further provides a process cartridge and an electrophotographic image having a constitution capable of avoiding contact between the electrophotographic photosensitive member and the developing means when the developing means is provided in the main body of the electrophotographic image forming apparatus. An object is to provide a forming device.

[0009]

Means for Solving the Problems A first invention of the present invention is:
In a process cartridge detachable from the main body of an electrophotographic image forming apparatus, an electrophotographic photoconductor, a process unit acting on the electrophotographic photoconductor, an electrophotographic photoconductor and a cartridge frame containing the process unit, and an electrophotographic photoconductor. A protective cover having an interference portion that covers the portion exposed to the outside and is attachable to and detachable from the cartridge frame body and that abuts on the main body of the electrophotographic image forming apparatus when the process cartridge is partially inserted into the main body of the electrophotographic image forming apparatus. A process cartridge characterized in that the cartridge frame is mounted on the main body of the electrophotographic image forming apparatus while leaving the protective cover in the middle of mounting.

A second aspect of the present invention is a process cartridge detachable from the main body of an electrophotographic image forming apparatus,
A cartridge frame provided with an electrophotographic photosensitive member, a process unit that acts on the electrophotographic photosensitive member, and a guide unit that includes the electrophotographic photosensitive member and the process unit and that engages with a linear guide of the main body of the electrophotographic image forming apparatus. And an electrophotographic image forming apparatus in which a process cartridge is detachably attached to a cartridge frame body by fitting a linear guide provided in parallel with a guide portion of the cartridge frame body to cover the exposed portion of the electrophotographic photoreceptor. A protective cover having an interference portion that comes into contact with the main body of the electrophotographic image forming apparatus when it is partially inserted into the linear motion guide of the main body,
And the cartridge frame is mounted on the main body of the electrophotographic image forming apparatus while leaving the protective cover in the middle of mounting.

A third aspect of the present invention is characterized in that the protective cover has a protrusion that fits in a groove shorter than the length of the process cartridge provided in the main body of the electrophotographic image forming apparatus in the attaching / detaching direction. The process cartridge according to the second invention.

According to a fourth aspect of the present invention, there is provided a developing unit which can be attached to and detached from the main body of the electrophotographic image forming apparatus, and which can advance and retreat with respect to the electrophotographic photosensitive member in the attached state.
A third aspect of the present invention is characterized in that the developing unit is provided with the groove and the protective cover is provided with one element member of the wedge device that retracts the developing unit by a wedge action when the process cartridge is mounted. It is a process cartridge.

A fifth aspect of the present invention is characterized in that an interference portion, which comes into contact with the front wall of the main body of the electrophotographic image forming apparatus in the mounting direction of the process cartridge, is provided in the protective cover midway in the mounting direction of the process cartridge. 2 is a process cartridge according to the second invention.

According to a sixth aspect of the present invention, the process cartridge comprises a charging means, a developing means or a cleaning means and an electrophotographic photosensitive member which are integrally formed into a cartridge.
It is the process cartridge according to the first aspect of the invention, wherein the cartridge is detachable from the main body of the electrophotographic image forming apparatus.

According to a seventh aspect of the present invention, in the process cartridge, at least one of a charging means, a developing means, and a cleaning means and an electrophotographic photosensitive member are integrally formed into a cartridge, and the process cartridge is attached to the main body of the electrophotographic image forming apparatus. The process cartridge according to the first aspect of the present invention is detachable.

An eighth invention of the present invention is the first invention, wherein the process cartridge is a cartridge in which at least a developing means and an electrophotographic photosensitive member are integrally formed and can be attached to and detached from the main body of the electrophotographic image forming apparatus. It is the described process cartridge.

A ninth aspect of the present invention is an electrophotographic image forming apparatus in which a process cartridge is attachable / detachable and forms an image on a recording medium. The electrophotographic photosensitive member, the process means acting on the electrophotographic photosensitive member, the cartridge frame body containing the electrophotographic photosensitive body and the process means, and the portion where the electrophotographic photosensitive member is exposed to the outside are covered and can be attached to and detached from the cartridge frame body. And a mounting means for detachably mounting the process cartridge having a protective cover having an interference portion that interferes with the main body of the electrophotographic image forming apparatus when the process cartridge is partially inserted into the main body of the electrophotographic image forming apparatus. B. An electrophotographic image forming apparatus comprising: a conveying unit for conveying the recording medium; and c, an abutting portion that abuts an interference portion of the process cartridge.

A tenth aspect of the present invention is an electrophotographic image forming apparatus in which a process cartridge is attachable / detachable and forms an image on a recording medium. A cartridge frame provided with an electrophotographic photosensitive member, a process unit that acts on the electrophotographic photosensitive member, and a guide unit that engages with a linear motion guide of an electrophotographic image forming apparatus main body including the electrophotographic photosensitive member and the process unit. And the electrophotographic photosensitive member covers the portion exposed to the outside and is fitted into the linear motion guide parallel to the guide portion provided on the cartridge frame, and is attachable to and detachable from the cartridge frame to form the electrophotographic image of the process cartridge. A linear motion provided as a mounting means for detachably mounting a process cartridge having a protective cover having an interference portion that interferes with the electrophotographic image forming apparatus main body when it is inserted into the linear motion guide of the apparatus main body halfway Guidance, b. A transport means for transporting the recording medium, c. An electrophotographic image forming apparatus, comprising: an abutting portion that abuts an interference portion of the process cartridge.

The eleventh invention of the present invention is the ninth or tenth invention, characterized in that the developing unit is detachably provided, and the developing unit is provided with an abutting portion for abutting the interference portion of the process cartridge. The described electrophotographic image forming apparatus.

A twelfth aspect of the present invention is one of a wedge device in which a developing unit is detachably attached and which is capable of moving back and forth in a mounted state, and which retracts the developing unit when a process cartridge is mounted. An electrophotographic image forming apparatus according to the eleventh invention, characterized in that the element member of (1) is included in the developing unit.

[0021]

2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus using an electrophotographic image forming process, an electrophotographic photosensitive member and process means acting on the electrophotographic photosensitive member are integrally formed into a cartridge, and this cartridge is used as an electronic device. A process cartridge system that can be attached to and detached from the photographic image forming apparatus main body is employed. According to this process cartridge system, the maintenance of the apparatus can be performed by the user himself without relying on a serviceman, so that the operability can be remarkably improved. Therefore, this process cartridge system is widely used in electrophotographic image forming apparatuses.

In some of such process cartridges, a protective cover that covers the electrophotographic photosensitive member is detachably provided when the process cartridge is removed from the main body of the electrophotographic image forming apparatus.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A typical embodiment of the present invention is as follows.
In a process cartridge detachably mountable to the main body of an electrophotographic image forming apparatus, an electrophotographic photosensitive drum, a process unit acting on the electrophotographic photosensitive drum, an electrophotographic image forming apparatus main body incorporating the electrophotographic photosensitive drum and the process unit Of the cartridge frame body provided with a guide portion that engages with the linear motion guide of the electrophotographic photosensitive drum and the linear motion guide provided in parallel with the guide portion of the cartridge frame body to cover the exposed portion of the electrophotographic photosensitive drum. And a protective cover having an interference portion that comes into contact with the electrophotographic image forming apparatus body when the process cartridge is partially inserted into the linear guide of the electrophotographic image forming apparatus body. However, only the cartridge frame body is a process cartridge that is mounted on the main body of the electrophotographic image forming apparatus while the protective cover is left in the middle of mounting.

Further, in a typical embodiment of the present invention, a linear guide of a mounting means for removably mounting the above-mentioned process cartridge, a roller and a guide for transporting the recording paper, An electrophotographic image forming apparatus comprising: an abutting portion that abuts an interference portion of the process cartridge.

The interference part of the above-mentioned process cartridge is
The protrusion is a protrusion that fits in a groove shorter than the length of the process cartridge of the main body of the electrophotographic image forming apparatus in the attaching / detaching direction and is provided on the protective cover.

Further, when the protective cover is provided with a ridge, a wedge device for retracting the developing unit with respect to the developing unit detachably attached to the main body of the electrophotographic image forming apparatus and capable of advancing and retracting with respect to the photosensitive drum. There is a mode in which one of the element members is provided in the protective cover.

Further, there is a mode in which the protective cover is provided with an interfering portion to be brought into contact with the front wall of the electrophotographic image forming apparatus.

In the detailed description of the embodiments described later, the process cartridge is described as being attached to and detached from the main body of the electrophotographic image forming apparatus by linearly moving from the longitudinal direction. It is obvious that the process cartridge can be attached to and detached from the main body in the longitudinal direction in the intersecting direction, and the detachable protective cover can be provided in the cartridge frame body of the process cartridge in the intersecting direction. Even when the process cartridge is rotationally attached to or detached from the main body of the electrophotographic image forming apparatus in the longitudinal direction, for example, an arc guide is provided on the cartridge frame to protect the arc guide. The present invention also includes the case where the cover is fitted and the protective cover is detachable from the cartridge frame.

[Detailed Description of Embodiment] Next, a process cartridge and an electrophotographic image forming apparatus according to an embodiment of the present invention will be specifically described with reference to the drawings.

(Embodiment A) Embodiment A will be described with reference to FIGS. 1 to 5. 1 is a perspective explanatory view of the process cartridge, FIG. 2 is a sectional view of the protective cover, FIG. 3 is a structural explanatory view of the image forming apparatus in which the process cartridge is mounted, and FIGS. 5 is an explanatory view of the structure of the process cartridge, and FIG. 5 is an explanatory view of the mounting structure of the process cartridge.

As the order of the description, the overall structure of the process cartridge and the image forming apparatus will be described first, and then the structure of the protective cover of the process cartridge will be described.

{Overall Configuration} In this electrophotographic image forming apparatus (hereinafter referred to as image forming apparatus) A, as shown in FIG. 3, the original placed on the original platen glass 1d is read by the original reading means 1. That is, the original is irradiated with light by the light source 1a, and the reflected image light is moved together with the light source 1a in the direction of arrow a. The mirror 1b1 and the folding mirror 1b2 move in the same direction as the mirror 1b1 at a speed half that of the mirror 1b1. The image light reflected and transmitted through the zoom lens 1c is reflected by the fixed mirror 1b3 to form an image on the photosensitive drum 6 which is an image carrier. The photosensitive drum 6 is rotating in the direction of the arrow in the figure, and is uniformly charged beforehand by the charging means 7 to form an electrostatic latent image by the exposure. A process means is arranged around the photosensitive drum 6, and a developer (hereinafter referred to as “toner”) is applied to the electrostatic latent image by the developing means 8 to form a visible image. In synchronism with this image formation, the recording medium 2 is conveyed by the conveying means 3 and the toner image is transferred.

In the construction of the conveying means 3, a paper feed cassette 3a is detachably attached to the lower part of the apparatus, and a recording medium 2 such as paper is loaded on an intermediate plate 3a1 in the cassette 3a.
The recording medium 2 is brought into contact with the feeding roller 3b by a pressure structure (not shown). When the feeding roller 3b rotates, it is fed from the uppermost recording medium 2, and the feeding roller 3b
And the separation pad 3c, the sheets are separated and fed one by one. Then, it passes through the reverse conveyance path 3d to reach the registration roller pair 3e, is conveyed to the transfer means 4 in synchronization with the image formation, and the recording medium 2 on which the image is transferred by the transfer means 4 is fixed by the conveyance belt 3f. The recording medium 2 on which the image has been fixed is conveyed to the discharge tray 3i by the discharge roller pair 3g.

The transfer means 4 is composed of a roller member in this embodiment, and by applying a voltage having a polarity opposite to that of the toner image to the transfer roller 4, the toner image on the photosensitive drum 6 is recorded on the recording medium 2. Is to be transferred to.

The fixing means 5 comprises a driving roller 5a and a fixing member 5c which is a rotatable endless sheet member to which heat is applied by a heater 5b. The recording medium 2 passes between the driving roller 5a and the fixing member 5c. In doing so, heat and pressure are applied to transfer onto the recording medium 2 to fix the toner.

As shown in FIGS. 3 and 4, the image forming portion comprises a photosensitive drum 6, a charging means 7, a developing means 8, a cleaning means 9 and the like, and toner is supplied in accordance with the information read by the original reading means 1. In order to form an image, the photosensitive drum 6 having a photosensitive layer is rotated, and the surface thereof is uniformly charged by applying a voltage to the charging roller 7 which is the charging means 7. The image is exposed on the photosensitive drum 6 through the exposure unit to form an electrostatic latent image, and the electrostatic latent image is developed by the developing unit 8.

In the developing means 8, the toner in the toner storage portion is fed by the toner feeding member 8a, the developing roller 8b having a fixed magnet is rotated, and the developing blade 8 is used.
A toner layer to which a triboelectric charge is applied by c is formed on the surface of the developing roller 8b, and the toner is transferred to the photosensitive drum 6 according to the latent image to form a toner image and visualize it. Then, after a voltage having a polarity opposite to that of the toner image is applied to the transfer roller 4 to transfer the toner image onto the recording medium 2, the cleaning blade 9a scrapes off the toner remaining on the photosensitive drum 6 and the waste toner reservoir 9b. The residual toner on the photoconductor drum 6 is removed by the cleaning means 9 which collects the toner.

In this embodiment, the developing unit B integrally including the developing roller 8b having the image forming section and the toner storage section for storing toner, the photosensitive drum 6, the charging means 7, The developing unit B is divided into process cartridges C that integrally have cleaning means 9.
And the process cartridge C are the image forming apparatus main body 1
It can be attached to and detached from 0.

The mounting means of the developing unit B is an electrophotographic image forming apparatus main body (hereinafter referred to as image forming apparatus main body) 10
The guide parts 8d and 8e that can be inserted and removed in the front and back directions of the paper surface of FIG. 4 are engaged with the hook portions 10a and 10b of the linear motion guides extending in the direction perpendicular to the paper surface of FIG. While having the guide portions 8d and 8e on the hook portions 10a and 10b, the guide portions 8d and 8e are movable in the direction of arrow a in FIG. 4 by a predetermined amount. Then, it is biased in the direction opposite to the arrow a by a biasing means such as a spring (not shown). A cam member 11 that abuts the developing unit B is rotatably attached to the image forming apparatus main body 10 by a shaft 11b. A handle 11c is attached to the shaft 11b.

As shown in FIG. 4B, when the handle 11c is rotated counterclockwise from the position where the position corresponding to the basic circle of the cam member 11 contacts the developing unit B,
As shown in FIG. 4A, when the cam member 11 rotates and the cam protrusion 11a pushes the developing unit B, the unit B moves in the direction of arrow a against the urging force of the urging means (not shown). And the developing roller 8b comes into contact with the photosensitive drum 6. In this contact, a spacer (having an outer diameter slightly larger than that of the developing roller 8b) attached to the developing roller 8b is brought into contact with the photosensitive drum 6, and the photosensitive drum 6 and the developing roller 8b have a minute gap. Come to separate.

On the other hand, when the handle 11c is rotated clockwise from FIG. 4 (a), the cam member 1 is moved as shown in FIG. 4 (b).
When 1 rotates and the cam convex portion 11a does not push the developing unit B, the developing unit B is moved in the direction opposite to the arrow a by the urging force of the urging means (not shown), and the developing roller 8b is separated from the photosensitive drum 6. Separate. At this time, the process cartridge C becomes detachable from the image forming apparatus main body 10.

The structure of the mounting means for mounting and dismounting the process cartridge C with respect to the image forming apparatus main body 10 is such that the linear guides extending at right angles to the plane of FIG. Portions 12a and 12b are provided, and correspondingly, the image forming apparatus main body 10 is provided with hook portions 10c and 10d serving as guide portions. Therefore, as shown in FIG. 5, the process cartridge C is inserted into and removed from the image forming apparatus main body 10 by inserting and removing the process cartridge C so that the locking portions 12a and 12b are fitted to the hook portions 10c and 10d. Can be attached and detached.

Here, the process cartridge C has an opening 13a (FIG. 3) in a part of the cartridge frame 13 so that the photosensitive drum 6 comes into contact with the transfer roller and the developing roller 8b when the process cartridge C is mounted in the image forming apparatus main body 10. 2) is provided, and a part of the photoconductor drum 6 is exposed from the opening 13a. Therefore, if it is left as it is, the photosensitive drum 6 is exposed to the external light and deteriorates before being mounted on the image forming apparatus main body 10, and the photosensitive drum 6 is directly touched by the hand during mounting.

Therefore, in the embodiment B, the process cartridge C is installed in the image forming apparatus main body 10 as shown in FIG.
Before the mounting, the protective cover 14 is attached to cover the portion of the photosensitive drum 6 exposed from the frame opening 13a.

By attaching the protective cover 14, the photoconductor drum 6 can be attached before the image forming apparatus main body 10 is attached.
Is not exposed to external light, and since the photosensitive drum 6 is covered with the protective cover 14 when mounted,
As shown in FIG. 5, the user directly touches the photosensitive drum 6 with the hand H.
You will not be touched by.

As shown in FIG. 2, the cartridge frame 13 is provided with a charging means 7, a cleaning blade 9a, and a cleaning means 9 having a waste toner reservoir 9b. A corner 13b is provided above the portion of the cartridge frame 13 facing the developing unit B.
A ridge 13c having a key-shaped cross section is provided over the entire length in the direction perpendicular to the plane of FIG. A guide 13d is provided.

The protective cover 14 is the protective cover guide 13 described above.
From the guide portion 14d that is slidably engaged with d, it has a hanging portion 14e that descends downward along the cartridge frame body 13, and subsequently has a drum protecting portion 14f that follows the photosensitive drum 6, and further has a hanging portion 14e. Also, there are provided ridges 14b and 14c protruding from the drum protection portion 14f toward the developing unit B. The ridges 14b have the same height in a direction perpendicular to the paper surface, but the ridges 14c have a root portion in a direction perpendicular to the paper surface, and the ridges 14c have a rear surface side (back side) of the paper surface of FIG. 2 from the front side. Also, the height is low, and the top surface of the protrusion 14c is provided with a gradient in the crossing direction with respect to the plane of FIG.

The protective cover 14 is made of a molded product such as plastic. In front of the protective cover 14, there is provided a knob portion 14a that a user can grip when removing the protective cover 14 from the process cartridge C.

As opposed to the protrusions 14b and 14c of the protective cover 14 which project toward the developing unit B, the protrusion 14b is slidably engaged with the frame of the developing unit B as shown in FIGS. A lower wall 41 having a slope in the longitudinal direction is provided so that the slopes of the groove 40 and the top surface of the protrusion 14c are in contact with each other over the entire surface. The depth of the groove 40 is shorter than the entire length of the developing unit B in the longitudinal direction. In this example, as shown in FIG. 6, the depth of the groove 40 is defined by the rib 40a. However, the limitation of the depth of the groove 40 need not be ribs when integrally provided in the frame of the developing unit B. Further, a stopper such as a small screw may be provided in the groove 40 of the frame of the developing unit B.

The tip end surface of the protrusion 14b contacts the rib 40a provided in the groove 40 of the developing unit B, and the interference portion 14b1.
It has become.

When the user holds the process cartridge C by the operation as shown in FIG. 5 and inserts the guide portions 12a and 12b of the cartridge frame 13 into the hook portions 10c and 10d of the image forming apparatus main body 10, In addition, the protrusion 14 b of the protective cover is provided with the groove 40 provided in the developing unit B.
Then, the other protrusion 14c contacts the lower wall 41 of the developing unit B. By providing these ridges 14b and 14c, the developing unit B can be reliably operated when the process cartridge C is inserted into the image forming apparatus main body 10.
In FIG. 2, since it moves in the direction of arrow f, there is no risk of damaging the developing roller 8b and the like in the developing unit B with the cartridge frame 13 and the like. By providing the ridges 14b and 14c, the process cartridge C is protected from the protective cover 14
In order to reliably guide the protective cover 14 when pulling out the protective cover 14, the protective cover 14 has a relatively thin wall thickness and a long and slender shape, and even when the strength thereof is relatively weak, the protective cover 14 is pulled out from the process cartridge C. There is no risk of damaging the photosensitive drum 6 and the developing roller 8b due to twisting, deformation, etc. Forming the cartridge frame 13 of the process cartridge C with a thin wall thickness has the effect of reducing the weight of the process cartridge C.

On the other hand, the rib 40 is provided in the groove 40 provided in the developing unit B into which the protrusion 14b of the protective cover 14 is inserted.
As shown in FIG. 5, when the protective cover 14 and the process cartridge C are inserted into the main body 10 of the image forming apparatus, the interference portion 14b1 of the ridge 14b on the protective cover 14 becomes the rib 40a. At the end, protective cover 14
However, when the process cartridge C is further pushed in, the engaging portion such as a notch device (not shown), which is a kind of notch device (not shown) between the process cartridge C and the protective cover 14 is disengaged, and finally the process cartridge C is released. At the time when the process cartridge C is mounted, only the protective cover 14 is in a state of protruding from the image forming apparatus main body 10 (see FIG. 7). Therefore, the user can easily visually recognize the existence of the protective cover 14 and avoid forgetting to remove it. After that, the user may grasp the knob portion 14a of the protective cover 14 with the hand H and pull out the protective cover 14 to the front.

As shown in FIG. 8, a front cover 43 is attached to the lower side of the front wall 10e of the image forming apparatus main body 10 by a hinge 43a with a stay, and the front cover 43 is in a standing position to cover the front wall 10e. Thus, the front wall 10e can be opened in a substantially horizontal position. Normally, the replacement work of these process cartridges C is performed by opening the front cover 43 of the image forming apparatus main body 10. Therefore, even if the user forgets to remove the protective cover 14,
It becomes impossible to close the front cover 43, which also prevents forgetting to remove the protective cover 14. In addition, in such an image forming apparatus, it is usually prevented in the electric circuit from operating the apparatus with the front cover 43 left open.
It is possible to prevent the device from operating without forgetting to take it.

(Embodiment B) Embodiment B is shown in FIG.

This embodiment relates to a process cartridge D in which a developing means, a photosensitive drum, a charging means, and a cleaning means are integrated into a cartridge.

The process cartridge D has longitudinal guide portions 12f and 12g at the upper corners of the frame body. The guide portions 12f and 12g extend in a direction perpendicular to the conveying direction of the recording medium 2 provided in the image forming apparatus main body 10. Linear motion guide 10f, 10g
It is designed to slide into. On the lower side of the frame of this process cartridge D, wide T-grooves 15 are provided in the longitudinal direction on both sides of the photosensitive drum 6, so that the photosensitive drum 6 (and the developing roller 8b and the developing roller) may not be exposed. ) Is fitted with a protective cover 14 that is not easily touched by the user. The protective cover 14 has a flat plate portion 14i that slides into the T-shaped groove 15, and a protrusion 14h is provided on the lower surface of the flat plate portion 14i from the front side in the longitudinal direction to the midway. The rear end surface of the protrusion 14h contacts the front wall 10e of the image forming apparatus main body 10 with the interference portion 1.
It is 4d1. The interference portion 14d1 may be a protrusion.

Guide portion 12 of process cartridge D
f and 12g are linear motion guides 10f of the image forming apparatus main body 10,
When inserted into 10 g, the interference portion 14 of this ridge 14h
The mounting of the process cartridge D is completed when h1 hits a part of the image forming apparatus main body 10, for example, the front wall 10c, and only the protective cover 14 projects. The user
It is the same as the above-mentioned example that the protective cover 14 may be removed by hand.

(Other Embodiments) The above-mentioned image carrier is not limited to the above-mentioned photosensitive drum, but includes the following, for example. First, a photoconductor is used as the photoconductor, and examples of the photoconductor include amorphous silicon, amorphous selenium, zinc oxide, titanium oxide, and organic photoconductor (OPC). The shape on which the photoconductor is mounted includes, for example, a rotating body such as a drum or a belt, and a sheet. In general, a drum-shaped or belt-shaped one is used. For example, in the case of a drum-type photoconductor, a photoconductor is deposited or coated on a cylinder of an aluminum alloy or the like. It is.

As the developing method, various known developing methods such as a two-component magnetic brush developing method, a cascade developing method, a touchdown developing method and a cloud developing method can be used.

As for the structure of the charging means, the so-called contact charging method was used in the above-mentioned embodiment, but as another structure, a tungsten wire conventionally used as another structure is provided with a metal shield such as aluminum around the three sides, It goes without saying that a configuration may be used in which positive or negative ions generated by applying a high voltage to the tungsten wire are moved to the surface of the photosensitive drum to uniformly charge the surface of the drum.

The charging means may be of a blade type (charging blade), a pad type, a block type, a rod type, a wire type or the like, other than the roller type.

As a method of cleaning the toner remaining on the photosensitive drum, a fur brush, a magnetic brush or the like may be used as the cleaning means.

The above-mentioned process cartridge is
It is provided with, for example, an electrophotographic photosensitive member as an image carrier, and at least one of processing means. Therefore, as the mode of the process cartridge, in addition to the embodiment described above, for example, the image carrier and the charging unit are integrally made into a cartridge, which can be attached to and detached from the apparatus main body. A device in which the image carrier and the cleaning means are integrally formed into a cartridge and can be attached to and detached from the apparatus main body. Further, there is a type in which an image carrier and two or more of the above-mentioned process means are combined into a cartridge to be detachable from the apparatus main body.

Further, although the electrophotographic copying machine is exemplified as the image forming apparatus in the above-mentioned embodiment, the present invention is not limited to this, and other image forming such as a laser beam printer, a facsimile machine, a word processor or the like is possible. Of course, it can also be used in a device.

[0065]

[Embodiments] These are described together with the embodiments.

[0066]

EFFECTS OF THE INVENTION According to the present invention, (1) the protective cover that is removable from the cartridge frame is provided with an interference portion that interferes with the main body of the image forming apparatus, so that the protective cover can be automatically removed halfway. Therefore, the protective cover can be easily removed. And it can be easily visually confirmed that the protective cover is not removed. (2) A protective cover for protecting the electrophotographic photoconductor or the electrophotographic photoconductor and the developer carrying member by attaching the process cartridge to the linear motion guide of the image forming apparatus main body and providing the linear motion guide on the cartridge frame of the process cartridge. Can be inserted in the linear motion guide of the cartridge frame, and when the protective cover is inserted into the linear motion guide partway, by providing the protective cover with an interference portion that interferes with the image forming apparatus main body,
When the process cartridge is mounted, the protective cover is partially left outside the main body of the image forming apparatus in the linear movement direction, and it can be easily visually recognized that the protective cover is not removed. In addition, it is easy to manufacture and requires no special cost. (3) In the above (2), the image forming apparatus main body is provided with a groove shorter than the length in the process cartridge attaching / detaching direction,
By providing the protective cover with a protrusion that fits into the groove, the protective cover can be guided when the process cartridge is attached or detached, so that deformation of the protective cover during attachment or detachment can be prevented even when the protective cover is thin and thin. Therefore, in the process of removing the protective cover, the protective cover does not touch the electrophotographic photosensitive member and the developer carrying member. (4) In the above (3), when the image forming apparatus main body has a developing unit that can move back and forth with respect to the electrophotographic photosensitive member, if a wedge device for attaching and detaching the process cartridge is provided between the process cartridge and the developing unit, When the process cartridge is mounted, the electrophotographic photosensitive member and the developer carrying member of the developing unit can be separated from each other, and the contact of the protective cover with the developer carrying member can be eliminated. (5) In (2) above, if the contact portion of the interference portion of the protective cover is the front wall of the image forming apparatus main body, it is not necessary to provide a member for contacting the interference portion on the image forming apparatus main body side.

[Brief description of the drawings]

 The drawings show embodiments of the present invention.

FIG. 1 is a perspective view of a process cartridge according to an embodiment a.

FIG. 2 is a vertical cross-sectional view of the process cartridge according to the first embodiment.

FIG. 3 is a vertical cross-sectional view for explaining the configuration of the image forming apparatus.

4A and 4B are vertical cross-sectional views each schematically showing a structure of a process cartridge.

FIG. 5 is a perspective view illustrating mounting of the process cartridge according to the first embodiment.

FIG. 6 is a perspective view of the developing unit according to the first embodiment.

FIG. 7 is a perspective view illustrating mounting of a process cartridge.

FIG. 8 is a perspective view illustrating mounting of the process cartridge in the image forming apparatus.

FIG. 9 is a perspective view illustrating mounting of the process cartridge according to the embodiment B.

[Explanation of symbols]

1 ... Document Reading Means 1a ... Light Sources 1b1, 1b2 ...
Mirror 1b3 ... Fixed mirror 1c ... Zoom lens 1
d ... Original platen glass 2 ... Recording medium 3 ... Conveying means 3a ... Paper feed cassette 3a1 ... Middle plate 3
b ... Feed roller 3c ... Separation pad 3d ... Reverse conveyance path 3e ... Register roller pair 3f ... Conveyor belt 3g ... Ejection roller pair 3i ... Ejection tray 4 ... Transfer means (transfer roller) 5 ... Fixing means 5a ... Drive roller 5b ... Heater 5c
... Fixing member 6 ... Photoreceptor drum 7 ... Charging means (charging roller) 8 ... Developing means 8a ... Toner feeding member 8b ... Developing roller 8c ... Developing blades 8d, 8e ... Guide portion 9 ... Cleaning means 9a ... Cleaning blade
9b ... Waste toner reservoir 10 ... Image forming apparatus main body 10a, 10b, 10c, 1
0d ... Hooking part 10e ... Front wall 10f, 10g ... Linear motion guide 11 ... Cam member 11a ... Convex part 11b ... Shaft 11c ...
Handles 12a, 12b ... Locking portions 12f, 12g ... Guide portions 13 ... Cartridge frame body 13a ... Openings 13b ... Incised corner portions 13c ... Protrusions 13d ... Protective cover guides 14 ... Protective cover 14a ... Knob portions 14b, 14c
… Slits 14b1… Interference part 14d… Guide part 14
d1 ... Interference part 14e ... Hanging part 14f ... Drum protection part 14h ... Projection 14h1 ... Interference part 14i ... Flat plate part 15 ... T groove 40 ... Line groove 41 ... Lower wall 43 ... Front cover A ... Image forming device B ... Development unit C ... Process cartridge D ... Process cartridge H ... Hand

Claims (12)

[Claims] 1. A process cartridge attachable to and detachable from a main body of an electrophotographic image forming apparatus, comprising: an electrophotographic photosensitive member; process means acting on the electrophotographic photosensitive body; and a cartridge frame body containing the electrophotographic photosensitive body and the process means. , Having an interference portion that covers a portion of the electrophotographic photosensitive member exposed to the outside and is attachable to and detachable from the cartridge frame body, and that abuts on the main body of the electrophotographic image forming apparatus when the process cartridge is partially inserted into the main body of the electrophotographic image forming apparatus With a protective cover,
And a cartridge frame that is mounted on the main body of the electrophotographic image forming apparatus while leaving the protective cover in the middle of mounting. 2. A process cartridge detachably mountable to a main body of an electrophotographic image forming apparatus, comprising an electrophotographic photosensitive member, a process unit acting on the electrophotographic photosensitive member, an electrophotographic photosensitive member and a process unit. The cartridge frame body is provided with a guide part that engages with the linear motion guide of the main body of the device, and the linear motion guide that is provided in parallel with the guide part of the cartridge frame cover the part where the electrophotographic photosensitive member is exposed to the outside. A protective cover that is removable from the cartridge frame and has an interference portion that comes into contact with the electrophotographic image forming apparatus main body when the process cartridge is partially inserted into the linear motion guide of the electrophotographic image forming apparatus main body. Then, the process cartridge is characterized in that the cartridge frame is mounted on the main body of the electrophotographic image forming apparatus while leaving the protective cover in the middle of mounting. 3. The protective cover is provided with a protrusion that fits in a groove shorter than the length of the process cartridge provided in the main body of the electrophotographic image forming apparatus in the mounting / removing direction. Process cartridge. 4. A developing unit, which is detachable from the main body of the electrophotographic image forming apparatus and is capable of advancing and retreating with respect to the electrophotographic photosensitive member in the mounted state, is provided with the groove and the process cartridge. When
The process cartridge according to claim 3, wherein the protective cover is provided with one element member of the wedge device that retracts the developing unit by a wedge action. 5. The protective cover is provided with an interference portion that comes into contact with the front wall of the main body of the electrophotographic image forming apparatus in the mounting direction of the process cartridge in the middle of the mounting direction of the process cartridge. Process cartridge. 6. The process cartridge, wherein a charging unit, a developing unit or a cleaning unit and an electrophotographic photosensitive member are integrally formed into a cartridge, and the cartridge is detachable from the main body of the electrophotographic image forming apparatus. 1. The process cartridge according to 1. 7. The process cartridge, wherein at least one of a charging unit, a developing unit, a cleaning unit and an electrophotographic photosensitive member is integrally formed into a cartridge, which is attachable to and detachable from the main body of the electrophotographic image forming apparatus. 1. The process cartridge according to 1. 8. The process cartridge according to claim 1, wherein at least the developing means and the electrophotographic photosensitive member are integrated into a cartridge so that the process cartridge can be attached to and detached from the main body of the electrophotographic image forming apparatus. 9. An electrophotographic image forming apparatus in which a process cartridge is detachably mountable and which forms an image on a recording medium, comprising: a. Electrophotographic photosensitive member, process means acting on the electrophotographic photosensitive body, cartridge frame body containing the electrophotographic photosensitive body and process means, and a part that is exposed to the outside of the electrophotographic photosensitive member is covered and removable to the cartridge frame body When the process cartridge is partially inserted into the main body of the electrophotographic image forming apparatus, a protective cover having an interference portion that interferes with the main body of the electrophotographic image forming apparatus, and mounting means for detachably mounting the process cartridge having B. A transport means for transporting the recording medium, c. An electrophotographic image forming apparatus comprising: an abutting portion that abuts an interference portion of the process cartridge. 10. The process cartridge is detachable,
An electrophotographic image forming apparatus for forming an image on a recording medium, comprising: a. A cartridge frame body provided with an electrophotographic photosensitive member, a process unit that acts on the electrophotographic photosensitive member, and a guide unit that engages with a linear motion guide of an electrophotographic image forming apparatus main body including the electrophotographic photosensitive member and the process unit. And the electrophotographic photosensitive member covers the portion exposed to the outside and is fitted into a linear guide that is parallel to the guide portion provided on the cartridge frame, and can be attached to and detached from the cartridge frame to form an electrophotographic image on the process cartridge. A protective cover having an interference portion that interferes with the electrophotographic image forming apparatus main body when the electrophotographic image forming apparatus main body is inserted partway into the linear motion guide, and a process cartridge having a protective cover provided as a mounting means for detachably mounting the process cartridge. A moving guide; b, a transporting means for transporting the recording medium; c, an abutting portion that abuts on an interference portion of the process cartridge. And an electrophotographic image forming apparatus. 11. The electrophotographic image forming apparatus according to claim 9, wherein the developing unit is detachably provided, and the developing unit is provided with an abutting portion that abuts the interference portion of the process cartridge. 12. A developing unit, which is detachable and has a position capable of advancing and retracting in a mounted state, and which retracts the developing unit when a process cartridge is mounted. The electrophotographic image forming apparatus according to claim 11, wherein the electrophotographic image forming apparatus comprises: