JP3599674B2 - Process cartridge and image forming apparatus to which the process cartridge can be attached and detached - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a process cartridge and an image forming apparatus to which the process cartridge can be attached and detached.
[0002]
Here, examples of the image forming apparatus include an electrophotographic copying machine, a facsimile machine, a laser beam printer, a word processor, and the like.
[0003]
(Background technology)
2. Description of the Related Art In an electrophotographic image forming apparatus, a process cartridge is formed by integrating image forming process devices such as a photosensitive drum, a developing device, and a cleaning device, and the process cartridge is detachably mountable in a main body of the image forming device. Some are arranged in. This process cartridge is intended to facilitate maintenance and the like by exchanging the entire process cartridge when the toner in the developing device is exhausted or when the cleaning device is full of waste toner. For example, JP-A-51-2433).
[0004]
[Problems to be solved by the invention]
In such a process cartridge, it is desired that the process cartridge mounted on the apparatus main body can be easily removed from the apparatus main body.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a process cartridge and an image forming apparatus in which operability when removing the process cartridge from the image forming apparatus main body is further improved.
[0006]
Another object of the present invention is to provide a process capable of easily releasing the engagement between a body gear provided in an apparatus main body and a driven gear provided in a process cartridge when the process cartridge is taken out of the image forming apparatus main body. An object of the present invention is to provide a cartridge and an image forming apparatus.
[0007]
[Means for Solving the Problems]
A main invention for solving the above problems is a process cartridge detachably mountable to an image forming apparatus main body, wherein a cartridge frame, a photosensitive drum, a process means acting on the photosensitive drum, and the process cartridge are attached to the image forming apparatus. A first protruding portion provided to protrude from the cartridge frame provided at one end and the other end in the axial direction of the photosensitive drum for guiding the process cartridge when mounted on the main body; The process cartridge is provided on the image forming apparatus main body for guiding the process cartridge when the process cartridge is mounted on the image forming apparatus main body and when the process cartridge is mounted on the image forming apparatus main body. A front end for engaging the main body drum bearing to position the process cartridge. A second protrusion provided on one end and the other end in the axial direction of the photoconductor drum, the second protrusion being provided to protrude from the cartridge frame, and provided on a coaxial line with the axis of the photoconductor drum. When the process cartridge is positioned with respect to the image forming apparatus main body when the second projecting section, the main body drum bearing section and the second projecting section are engaged with each other, the process cartridge is provided on the image forming apparatus main body. Body drive gear Ya And the driving force for rotating the photosensitive drum is Ya Driven gear to receive from Ya A driven gear provided coaxially with the axis of the photosensitive drum. Ya And removing the process cartridge from the image forming apparatus main body by lifting the upstream side of the process cartridge in the mounting direction in which the process cartridge is mounted to the image forming apparatus main body, and rotating the image forming apparatus. The first projection is provided on the first projecting portion, which comes into contact with a main body support surface provided on the main body and becomes a rotation fulcrum. Lower end And wherein the process cartridge is provided above the second protruding portion in a state where the process cartridge is mounted on the image forming apparatus main body at a downstream side of the second protruding portion in the mounting direction. Lower end And having the following.
[0008]
According to another aspect of the present invention, there is provided an image forming apparatus in which a process cartridge is detachable. Ya (B) a main body support surface, (c) a main body drum bearing portion, (d) a cartridge frame, a photoconductor drum, a process unit acting on the photoconductor drum, and forming the process cartridge in the image forming process. First protrusions provided at one end and the other end in the axial direction of the photosensitive drum for projecting the process cartridge when mounted on the main body of the apparatus, the first protrusions being provided to protrude from the cartridge frame. And a unit for guiding the process cartridge when the process cartridge is mounted on the apparatus main body, and engaging with the main body drum bearing portion when the process cartridge is mounted on the image forming apparatus main body. The cartridge provided at one end and the other end in the axial direction of the photosensitive drum for positioning the process cartridge A second protruding portion protruding from the frame, wherein the second protruding portion is provided coaxially with the axis of the photosensitive drum, and the main body drum bearing portion and the second protruding portion are related to each other. When the process cartridge is positioned with respect to the apparatus main body, the main body driving gear Ya And the driving force for rotating the photosensitive drum is Ya Driven gear to receive from Ya A driven gear provided coaxially with the axis of the photosensitive drum. Ya In order to remove the process cartridge from the apparatus main body, in the mounting direction in which the process cartridge is mounted on the apparatus main body, when lifting and rotating the upstream side of the process cartridge, the process cartridge comes into contact with the main body support surface. A rotation fulcrum, provided on the first protrusion Lower end And wherein the process cartridge is mounted above the second protruding portion in a state where the process cartridge is mounted on the apparatus main body, downstream of the second protruding portion in the mounting direction. Lower end And a mounting portion for removably mounting a process cartridge having the following.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
[0010]
First, a first preferred embodiment to which the present invention is applied will be described with reference to FIGS.
[0011]
FIG. 1 shows a side cross section of the image forming apparatus. In FIG. 1, reference numeral 1 denotes a process cartridge which integrally includes an image forming process device such as a photosensitive drum, a developing device, a cleaning device, and a charging device, and is detachably disposed in the apparatus main body 100. The process cartridge 1 is pressed and positioned at a mounting position in the apparatus main body 100 via a guide member 10 and a pressing member 20 provided in the apparatus main body 100. In the state shown in FIG. 1, the process cartridge 1 has not been mounted in the apparatus main body 100 yet. In the center of the apparatus main body 100, the position of the photosensitive drum 1a of the process cartridge 1 when positioned at the mounting position is indicated by a two-dot chain line.
[0012]
On the paper supply side of the photosensitive drum 1a, a paper supply cassette 2, a paper supply roller 3, a registration roller 4, a transfer guide 5, and a transfer roller 6 are provided. Further, a fixing device 7, a guide 7a, a transport roller 8a, a paper discharge roller 8b, a paper discharge tray 9, and the like are provided on the paper discharge side. Then, an electrostatic latent image formed on the photosensitive drum 1a is developed by a developing device based on image light emitted in accordance with an image signal from the host device, and is visualized as a toner image. The toner image moves to the transfer roller 6 with the rotation of the photosensitive drum 1a, and is transferred onto the transfer paper P by the transfer roller 6. Here, the transfer paper P in the paper feed cassette 2 is fed out one by one by the rotation of the paper feed roller 3 (in the direction of the arrow), and then sent to the registration roller 4. After the timing is adjusted by the registration roller 4, the sheet is conveyed between the photosensitive drum 1 a and the transfer roller 6. Then, the toner image on the photosensitive drum 1 a is transferred to the transfer paper P, and the transfer paper P on which the transfer is completed is sent to the fixing device 7. After the toner image is fixed as a permanent image by the fixing device 7, the toner image is stacked on a discharge tray 9 via a discharge roller 8. In the figure, 47, 48, and 49 are transport guides.
[0013]
Next, a mechanism for attaching and detaching the process cartridge 1 to and from the apparatus main body 100 will be described.
[0014]
The attachment / detachment mechanism is provided below the main body cover 101 that can be opened and closed up and down around the hinge 101a. The attachment / detachment mechanism includes a guide member 10 disposed obliquely, a pressing member 20 and an abutment member 22 disposed above the guide member 10. Therefore, the attachment / detachment mechanism attaches / detaches the process cartridge 1 pressed against the guide member 10 by the pressing member 20 in an oblique direction along the guide member 10. The guide member 10 and the pressure member 20 are provided one by one on both side surfaces of the apparatus main body 100 to position and support both side portions of the process cartridge 1. Will be described. The other has the same configuration.
[0015]
In the figure, to the right of the guide member 10, a bridging member 102 bridged between both side surfaces of the apparatus main body 100 and a slanted exterior plate 103 following the bridging member 102 are arranged obliquely parallel to the guide member 10. And constitutes a guide portion of the process cartridge 1 for the attachment / detachment mechanism.
[0016]
The guide member 10 is formed by resin molding, and has an upper part, an intermediate part, a lower part, and a lower part protruding toward the near side of the drawing of the drawing, except for the upper part which is the insertion part of the process cartridge 1. ing. A cam portion 11 for opening a drum shutter of the process cartridge 1 is provided on an upper portion. A first guide surface 12 for pressing and positioning the process cartridge 1 in a direction in which the process cartridge 1 is attached / detached is provided on the upper surface of the protrusion at the intermediate portion. In addition, since a downward step is provided in the middle projection, a step 12 a is also formed on the first guide surface 12.
[0017]
A second guide surface 13 for positioning the pressure of the process cartridge 1 similar to the first guide surface 12 is also provided on the upper surface of the projecting portion on the lower side of the guide member 10, and the lower portion is provided at the lower end. A drum bearing 14 that is circularly curved is provided. A support surface 15 for taking out the process cartridge 1 is provided on the lower side above the drum bearing portion 14 and on the inner surface of the protrusion. Note that a guide holding portion 16 for positioning and supporting the resin-molded transfer guide 5 is provided below the drum bearing portion 14 of the guide member 10. Therefore, the guide holding section 16 allows the transfer guide 5 to be accurately positioned with respect to the photosensitive drum 1a, and the transfer guide 5 to be easily replaced.
[0018]
The pressing member 20 is disposed above the cam portion 11 of the guide member 10 along the guide member 10, and the pressing portion 20 a at the tip thereof is urged downward by the pressing spring 21. . In addition, an abutting member 22 for positioning the process cartridge 1 is provided below the guide member 10.
[0019]
The process cartridge 1 has a shape shown by a chain line in the figure. On both side surfaces thereof, there are provided elongated first protrusions 30 which move along the first guide surface 12 of the guide member 10. Further, below the first projecting portion 30, there is provided a second projecting portion 31 (a projecting drum shaft of the photosensitive drum 1a) which moves along the second guide surface 13 of the guide member 10. In addition, a positioning groove 32 is provided on the upper surface of the process cartridge 1 so as to abut on the pressing portion 20 a of the pressing member 20. A pressing surface 33 that moves while being pressed by the pressing member 20 is provided on the upstream side in the mounting direction of the process cartridge 1 with respect to the determining groove 32.
[0020]
Further, the process cartridge 1 is provided with a drum shutter for protecting the photosensitive drum 1 a, and the link portion of the drum shutter engages / disengages with the cam portion 11 of the guide member 10 in conjunction with the attaching / detaching operation of the process cartridge 1. By doing so, the drum shutter is opened and closed. In the process cartridge 1, a driven gear for rotating an internal member is provided around a second protrusion 31 which is a drum shaft. When the process cartridge 1 is positioned at the mounting position of the apparatus main body 100, the driven gear meshes with the drive gear on the apparatus main body 100 side.
[0021]
Next, mounting of the process cartridge 1 on the apparatus main body 100 and removal from the apparatus main body 100 will be described with reference to FIGS.
[0022]
First, as shown in FIG. 1, the main body cover 101 is opened. After that, the end of the first projecting portion 30 of the process cartridge 1 is placed on the first guide surface 12 of the guide member 10, and the lower portion of the process cartridge 1 is guided by the bridge member 102 and the oblique exterior plate 103. Place on top. Subsequently, as shown in FIG. 2, when the process cartridge 1 is pushed into the inside of the apparatus main body 100 while the first projecting portion 30 of the process cartridge 1 is slid on the first guide surface 12, the process cartridge 1 Is pressed by the pressing portion 20 a of the pressing member 20, and the process cartridge 1 is pressed onto the first guide surface 12 of the guide member 10 via the first protrusion 30, and the posture thereof is constant. It is moved inside the apparatus main body 100 while being held in the state.
[0023]
In this case, the second protrusion 31 is located slightly above the second guide surface 13 of the guide member 10, and the process cartridge 1 is substantially supported by the first guide surface 12 by the first protrusion 30. ing.
[0024]
Further, as shown in FIG. 3, when the process cartridge 1 is pushed in, the cam portion 11 of the guide member 10 is engaged with the link portion of the drum shutter of the process cartridge 1, and the drum shutter is opened and the first portion is opened. The protrusion 30 moves over the step 12a of the first guide surface 12. Then, when the whole of the first protruding portion 30 is almost over the step 12a of the first guide surface 12, the process cartridge 1 is slightly rotated counterclockwise in FIG. The second protrusion 31 is supported on the second guide surface 13.
[0025]
When the process cartridge 1 is further pushed in, the process cartridge 1 is further rotated slightly counterclockwise as shown in FIG. Thereafter, when the operator releases his / her hand from the process cartridge 1, the second protrusion 31 of the process cartridge 1 is dropped into the drum bearing portion 14 of the guide member 10, and finally the positioning groove 32 of the process cartridge 1 The process cartridge 1 is positioned at the mounting position in the apparatus main body 100 in a state where the process cartridge 1 is pressed by the pressing member 20 by engagement with the abutting member 22 (see FIG. 5). In this case, the contact between the first and second protrusions 30 and 31 of the process cartridge 1 and the first and second guide surfaces 12 and 13 of the guide member 10 is completely released.
[0026]
In this case, as the process cartridge 1 is lowered, the pressing force of the pressing member 20 on the process cartridge 1 is reduced. Therefore, the operator gets a click feeling and can easily recognize that the process cartridge 1 has been positioned at the mounting position. Further, when the process cartridge 1 is dropped, the driven gear of the process cartridge 1 and the drive gear of the apparatus main body 100 smoothly mesh with each other.
[0027]
Next, a case where the process cartridge 1 is removed from the apparatus main body 100 will be described.
[0028]
When the process cartridge 1 is taken out of the apparatus main assembly 100, as shown in FIG. 6, the operator places the upper exposed portion of the process cartridge 1 in the counterclockwise direction (see FIG. 2) in the mounting direction (the direction of the arrow in FIG. 2). (Direction of arrow 6). Then, the lower end portion 30a (abutting portion) of the first projecting portion 30 is abutted against the supporting surface 15 (abutting) of the guide member 10, and the process cartridge 1 is further centered on the abutting point as shown in FIG. Is rotated counterclockwise (in the direction of the arrow in FIG. 6). By this operation, the second projecting portion 31 of the process cartridge 1 rises (3 to 6 mm) from the drum bearing portion 14, and at this time, the driven gear of the process cartridge 1 and the driving gear of the apparatus main body 100 are simultaneously disengaged. . Then, if the process cartridge 1 is pulled out in the direction of the first and second guide surfaces 12 and 13 of the guide member 10, the process cartridge 1 can be easily taken out from the apparatus main body 100. In this case, the engagement between the link portion of the drum shutter and the cam portion 11 of the guide member 10 is released, and the drum shutter is closed by the action of a spring member or the like.
[0029]
When the process cartridge 1 is mounted on the apparatus main body 100, the driven gear of the process cartridge 1 receives a driving force from the driving gear (body gear) of the apparatus main body 100 so that the pressure angle becomes substantially horizontal. ing. Therefore, as described above, the engagement between the two gears is smoothly released when the second protrusion 31 of the process cartridge 1 slightly rises from the drum bearing 14.
[0030]
As described above, when the process cartridge 1 is mounted, only by pressing the process cartridge 1 on the first guide surface 12 or the like formed on the side surface of the guide member 10 via the first protrusion 30 or the like, the process cartridge 1 is mounted. Is inserted into the apparatus main body 100 in a stable posture. Therefore, the mounting operation of the process cartridge 1 is facilitated, and the operability of attaching and detaching the process cartridge 1 is improved. In mounting the process cartridge 1, it is necessary to insert the process cartridge 1 into the apparatus main body 100 against the pressing force of the pressing member 20. Since the insertion direction is substantially orthogonal to the insertion direction, the pressing force does not become a large resistance to the insertion.
[0031]
Further, when the process cartridge 1 is positioned at the mounting position of the apparatus main body 100, the process cartridge 1 moves slightly downward, and the pressing force of the pressing member 20 decreases. Therefore, a click feeling occurs in the operation, and the operator can easily recognize that the process cartridge 1 has been reliably positioned at the mounting position. Also, when the operator lifts the process cartridge 1 (in the direction of the arrow in FIG. 6) in order to take out the process cartridge 1, the rotation fulcrum is moved to the lower end 30 a of the first protrusion 30 on the back side of the drum bearing 14 and the guide. Since it can be set at the abutting portion of the support surface 15 of the member 10 and the lifting position can be set sufficiently in front of the pressing position in the insertion direction, the force for lifting the process cartridge 1 can be small.
[0032]
Further, according to the present embodiment, the trajectory of attachment / detachment of the process cartridge 1 is the first trajectory in the oblique direction along the first and second guide surfaces 12 and 13 of the guide member 10, and the drum of the second protrusion 31. And a second vertical trajectory formed by dropping or lifting the bearing portion 14. Therefore, regardless of how the process cartridge 1 is inserted, the driven gear of the process cartridge 1 meshes with the drive gear of the apparatus main body 100 by the pressing force of the pressing member 20, and the process cartridge 1 is mounted. The possibility of damaging the tooth surface of the gear during the collision is small.
[0033]
Further, in attaching and detaching the process cartridge 1, there is no need to operate the guide member 10 and the pressure member 20 in conjunction with opening and closing of the main body cover 101. Therefore, the configuration of the main body cover 101 and the hinge portion thereof can be simplified, and there is no need to provide a protrusion or the like on the back surface side of the main body cover 101.
[0036]
Next, a second embodiment to which the present invention is suitably applied will be described with reference to FIGS.
[0037]
FIG. 8 shows a process cartridge to which the embodiment of the present invention is applied and an apparatus main body side.
9 is a left side view of the process cartridge shown in FIG. 8, FIG. 10 is a side view of the pressure member, and FIG. 11 is a side view of a guide member on the apparatus main body side.
[0038]
In this embodiment, in addition to the first embodiment, a rib 36 (third projecting portion) is further provided on the right side surface of the process cartridge 1. The rib 36 is provided above the first projecting portion 30 and substantially in parallel with the first projecting portion 30. Further, the shape of the guide rib 38 provided on the left side surface is different from the shape of the first protrusion 30 provided on the right side surface, so that the shape of the guide rib 38 is wider than the shape of the first protrusion 30. Therefore, according to the present embodiment, the trajectory when the process cartridge 1 is inserted into the apparatus main body is further restricted by the rib 36. Further, the rib 36 prevents the process cartridge 1 from rotating counterclockwise when the cam 35 on the cartridge 1 comes into contact with the drum shutter opening / closing cam surface 11 of the guide member 10 on the apparatus main body side when the cartridge is mounted. I do. When the cam 35 comes into contact with the cam surface 11, the cam 35 rotates in the counterclockwise direction (the direction of arrow a in FIG. 8), and opens the drum shutter 37 supported by the arm 37a (FIG. 9). On the other hand, the guide rib 38 regulates the rotation of the process cartridge 1 in the counterclockwise direction by the rib 41 provided on the guide member 10 on the apparatus main body side. As described above, according to the present embodiment, when the process cartridge is attached to or detached from the apparatus main body, the locus of the attachment / detachment of the process cartridge 1 is strictly regulated, and the opening and closing of the drum shutter 37 is steadily performed. Further, even when the opening of the main body cover 101 is small, even if the process cartridge 1 is largely rotated and pulled out at the time of attachment / detachment, it can be smoothly attached / detached.
[0039]
As described above, in the present embodiment, the first protruding portion 30 protruding outward from the frame 1b on one side of the cartridge frame 1b located on both sides in the axial direction of the photosensitive drum 1a, and the other side. A guide rib 38 is provided so as to protrude outward from the frame 1b. Further, a rib 36 is provided above the first protrusion 30 so as to also protrude outward. The first protrusion and the guide rib 38 are provided from the direction in which the cleaning means 53 is provided to the direction in which the developing means 52 is provided, and have an elongated shape. The rib 36 is provided with the cleaning means 53 from the direction in which the photosensitive drum 1a is provided, and has a long and narrow shape. The ribs 36 are provided substantially parallel to the first projecting portions 30, and the ribs 36 are provided so as to be shifted to the developing unit side from the first projecting portions 30. When the process cartridge 1 is mounted on the apparatus main body 100, the cam section 11 provided on the apparatus main body 100 is brought into contact with the frame 1b on which the first protrusion 30 and the rib 36 are provided, and the photosensitive drum is provided. A cam 35 for opening a drum shutter 37 that covers the transfer area 1a is provided.
[0040]
Here, an example of the size of the first protrusion 30, the rib 36, and the guide rib 38 will be described.
[0041]
First, the first protrusion 30 has a width (l ₁ ) Is about 5 mm and length (l ₂ ) Is about 50 mm. The rib 36 has a width (l ₃ ) Is about 2 mm and length (l ₄ ) Is about 35 mm. Further, the guide rib 38 has a wide width (l ₅ ) Is about 5 mm and the narrow width (l ₆ ) Is about 5 mm and length (l ₇ ) Is about 50 mm. Further, the protrusion amount from the frame 1b is about 5 mm for the first protrusion 30, about 3 mm for the rib 36, and about 8 mm for the guide rib 38.
[0042]
Next, the pressing member 20 of the present embodiment will be described with reference to FIG.
[0043]
In this embodiment, the roller 20b is provided in a portion of the pressing member 20 provided on the apparatus main body side, which slides with the process cartridge 1. The roller 20b is rotatable about a shaft 20c. Therefore, according to the present embodiment, the sliding resistance between the pressing member 20 and the cartridge 1 is further reduced, and the performance of attaching and detaching the process cartridge can be improved.
[0044]
The side surface 20d of the pressing member 20 regulates the side surface of the rib 39 protruding from the upper surface side end of the process cartridge 1 so that the cartridge 1 is moved rightward in the insertion direction when the process cartridge 1 is inserted. good. Thus, the cartridge is positioned in the width direction when the cartridge is inserted. When the pressed portion 33 of the cartridge 1 is formed in a rib shape without forming a surface, the contact surface contact with the pressing member 20 is reduced, so that the sliding resistance is further reduced.
[0045]
50 denotes an exposure frontage, 51 denotes a photosensitive drum, 52 denotes a developing unit (52a is a developing sleeve), and 53 denotes a cleaning unit.
[0046]
In each of the above-described embodiments, a process cartridge is a cartridge in which a charging device, a developing device or a cleaning device, and a photosensitive drum are integrally formed, and this cartridge is attached to a main body of an image forming apparatus (for example, a copying machine or an LBP). To make it removable. In addition, at least one of the charging device, the developing device, and the cleaning device and the photosensitive drum are integrally formed as a cartridge so that the cartridge can be attached to and detached from an image forming apparatus (for example, a copying machine, an LBP, or the like). Further, it refers to a device in which at least the developing device and the photosensitive drum are integrally formed as a cartridge so that the cartridge can be attached to and detached from an apparatus main body (for example, a copying machine, an LBP, or the like).
[0047]
【The invention's effect】
As described above, according to the present invention, operability when removing the process cartridge from the image forming apparatus main body can be improved. That is, according to the present invention, when the process cartridge is lifted and rotated when the process cartridge is removed from the apparatus main body, the process cartridge is provided on the first projecting portion of the process cartridge. Lower end Abuts on a main body support surface provided on the apparatus main body to serve as a rotation fulcrum. Then, the second protrusion of the process cartridge rises from the main body drum bearing provided on the apparatus main body, and further the driven gear of the process cartridge. Ya And the main body drive gear Ya Is disengaged. Therefore, the operability when removing the process cartridge from the apparatus main body can be improved.
[Brief description of the drawings]
FIG. 1 is a side sectional view of an image forming apparatus to which an embodiment of the present invention is applied.
FIG. 2 is a diagram illustrating the operation of attaching and detaching a process cartridge to and from an image forming apparatus.
FIG. 3 is a diagram illustrating an operation of attaching and detaching a process cartridge to and from an image forming apparatus.
FIG. 4 is a diagram illustrating the operation of attaching and detaching a process cartridge to and from the image forming apparatus.
FIG. 5 is an operation explanatory view of an operation of attaching and detaching a process cartridge to and from the image forming apparatus.
FIG. 6 is a diagram illustrating the operation of attaching and detaching a process cartridge to and from the image forming apparatus.
FIG. 7 is a diagram illustrating the operation of attaching and detaching a process cartridge to and from the image forming apparatus.
FIG. 8 is a perspective view of a process cartridge to which an embodiment of the present invention is applied.
FIG. 9 is a side view of the process cartridge shown in FIG.
FIG. 10 is a side view of the pressing member.
FIG. 11 is a side view of a guide member on the apparatus main body side.
[Explanation of symbols]
1 Process cartridge
1a Photosensitive drum
1b Frame
10 Guide member
11 Cam part
20 Pressing member
21 Pressure spring
22 Butt member
12 First guide surface
12a Step
13 Second guide surface
13a Step
14 Drum bearing
30 First protrusion
30a Lower end (contact part)
31 Second protrusion
32 positioning groove
33 Pressing surface (pressed part)
33a bending part
33b descending surface
35 cams
36 rib (third protrusion)
37 drum shutter
39 ribs
100 main unit
101 Body cover

Claims (7)

In a process cartridge detachable from the image forming apparatus main body,
A cartridge frame,
A photosensitive drum,
Process means acting on the photoconductor drum;
When the process cartridge is mounted on the image forming apparatus main body, the process cartridge is provided so as to protrude from the cartridge frame provided at one end and the other end in the axial direction of the photosensitive drum for guiding the process cartridge. A first projection,
The process cartridge is provided on the image forming apparatus main body for guiding the process cartridge when the process cartridge is mounted on the image forming apparatus main body and when the process cartridge is mounted on the image forming apparatus main body. A second projection projecting from the cartridge frame, which is provided at one end and the other end in the axial direction of the photosensitive drum for positioning the process cartridge by engaging with the main body drum bearing. A projecting portion, a second projecting portion provided coaxially with an axis of the photosensitive drum;
The main drum bearing portion and the second by a protrusion engages with, when said process cartridge is positioned relative to the image forming apparatus main body, a main body driving formic Ya provided in the image forming apparatus main body engaging said driving force to a photosensitive drum is rotated by a driven formic ya for receiving from the main assembly driving formic ya, driven formic provided on the axis coaxial with the photosensitive drum Ya
In order to take out the process cartridge from the image forming apparatus main body, when the process cartridge is mounted on the image forming apparatus main body in the mounting direction and the upstream side of the process cartridge is lifted and rotated, the image forming apparatus main body is A lower end portion provided on the first protruding portion which is in contact with the provided main body supporting surface and serves as a rotation fulcrum, wherein the process cartridge is disposed at a downstream side of the second protruding portion in the mounting direction. A lower end provided above the second protruding portion in a state where the lower end is mounted on the image forming apparatus main body;
A process cartridge comprising: The process cartridge according to claim 1, wherein the photosensitive drum is a member provided inside the process cartridge. The process cartridge according to claim 1, wherein the first protrusions provided on one end and the other end in the axial direction of the photoconductor drum have different shapes. 4. The process cartridge according to claim 1, wherein the second protrusion is a part of a drum shaft of the photoconductor drum. 5. Further, the process cartridge has a pressing surface which is pressed by a pressing member provided in the apparatus main body, wherein the processing cartridge has a pressing surface. Item 5. The process cartridge according to item 4. The said process means is at least any one of a charging means, a developing means, and a cleaning means , The Claim 1, Claim 2, Claim 3, or Claim 4, or Claim 4, or. A process cartridge according to claim 5 . In an image forming apparatus in which a process cartridge is detachable,
(A) a main body driving formic ya,
(B) a main body support surface;
(C) a main body drum bearing portion;
(D) a cartridge frame, a photosensitive drum, a process means acting on the photosensitive drum, and the guide for guiding the process cartridge when the process cartridge is mounted on the main body of the image forming apparatus. First protrusions provided at one end and the other end in the axial direction of the photosensitive drum, the first protrusions protruding from the cartridge frame, and the process cartridge when the process cartridge is mounted on the apparatus main body. And an axial direction of the photosensitive drum for positioning the process cartridge by engaging with the main body drum bearing portion when the process cartridge is mounted on the image forming apparatus main body. A second protruding portion provided on one end side and the other end side and protruding from the cartridge frame, The second projection provided on the same axis as the axis of the photosensitive drum, the main drum bearing and the second projection were engaged, and the process cartridge was positioned with respect to the apparatus main body. when the engaged with the main body driving formic ya, the driving force for the photosensitive drum to rotate a driven formic ya for receiving from the main assembly driving formic ya, the axis of the photosensitive drum a driven formic ya provided coaxially, in order to take out the process cartridge from the apparatus main body, in the mounting direction for mounting said process cartridge to the apparatus main body, when rotating to lift the upstream side of said process cartridge to, as a rotation fulcrum the body support surface and abut a said lower portion provided on the first protruding portion, than the second projecting portion in the mounting direction downstream In the state of mounting the process cartridge in the apparatus main body, a mounting portion for detachably mounting a process cartridge having a second protrusion lower end portion provided above the,
An image forming apparatus comprising:

Images