JPH07253696A - Image forming device - Google Patents

Abstract

PURPOSE:To improve a cartridge loading operability without applying load for positioning at the time of inserting the cartridge by inserting the process cartridge into the loading part in a state of opening the second frame body and positioning at the time of closing the second frame body. CONSTITUTION:At the time of inserting the cartridge B into the loading part, the projecting part 25a of the cartridge front end insertes in the recessed part 25b of an upper frame body 18. At this time, the positioning of the cartridge insertion rear part is not made. Next, on closing the upper frame body 18, the projecting part 6a of the cartridge insertion rear part insertes in the U groove 26b of a pressing member 22, in this way the positioning of the cartridge insertion front and rear direction is made, and moreover the cartridge B is pressed to the upper frame body 18 by the pressing force of a member 22, thus the positioning of the cartridge vertical direction is made. Furthermore, on closing the upper frame body 18, the engagement projecting part 27a and 18a of the member 22 respectively insertes in the engagement recessed part 27b and 28b of the upper frame body 18, thus positioning of the member 22 is made. Consequently, the loading operability of the cartridge B is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus which mounts a process cartridge to form an image.

[0002]

2. Description of the Related Art In an image forming apparatus such as a copying machine, a latent image is formed by selectively exposing a latent image on an image carrier uniformly charged by a charger, and the latent image is visualized with toner by a developing device. At the same time as forming an image, the image formed by the toner is transferred to a recording medium to record an image. In such an apparatus, maintenance of each member is performed by a professional service person, which may be inconvenient for the user.

Therefore, the image carrier, the charging device, the developing device,
By integrating the cleaning unit etc. into an integrated structure into a cartridge, the user can mount the cartridge on the main body of the apparatus to replenish toner and replace parts such as the image bearing member that have reached the end of life, facilitating maintenance. The one that has been put into practical use has been put into practical use.

When such a process cartridge is mounted on a copying machine having a so-called crocodile opening / closing structure, in which the upper frame body can be opened and closed with respect to the lower frame body around an opening / closing spindle, the cartridge mounting portion is mounted on the upper frame body. Is generally provided. In many copiers and the like, an optical system for reading an original is provided on the upper frame, and positional accuracy between the optical system and the image carrier in the process cartridge is required. This is because it is easier to obtain accuracy by mounting and positioning the process cartridge on the upper frame provided with the optical system.

As the positioning structure, for example, a structure as shown in FIG. 10 is used. That is, when the process cartridge 52 is slidably inserted into the cartridge mounting portion 51 provided on the upper frame 50 in the arrow direction, the positioning boss 52a is provided at the front portion of the cartridge and the insertion hole 52b is provided at the rear portion. deep. When the cartridge 52 is completely inserted into the mounting portion 51, the boss 52a and the fitting hole 52b are inserted.
A fitting hole 51a and a fitting boss 51b which can be fitted are provided. Thus, when the process cartridge 52 is mounted, the front and rear of the cartridge 52 are positioned.

Further, in a process cartridge used in an electrophotographic copying machine or the like, since a photoconductor is used as an image carrier, an exposure opening is provided for imagewise exposure of this photoconductor. A shutter that can open and close the opening is provided so that external light is not emitted from the opening and deteriorates the photosensitive drum. And mount the process cartridge 51
When the shutter is opened, the shutter is opened so that the image carrier can be exposed, and when it is removed from the mounting portion 51, the shutter is closed to protect the image carrier from outside light.

[0007]

However, the cartridge positioning structure shown in FIG. 10 has the following problems.

The first problem is the cartridge 52.
Had to be completely pushed into the mounting portion 51 so that the fitting hole 52b in the rear portion of the cartridge was fitted into the fitting boss 51b of the mounting portion 51.

Further, the opening shutter for exposure provided in the cartridge is opened by the shutter opening / closing member coming into contact with a predetermined position when the cartridge is inserted into the mounting portion. It made me feel bad.

The second problem is that since the photoconductor in recent years has improved sensitivity, it is easily deteriorated when exposed to external light. On the other hand, in the conventional image forming apparatus, since the exposure shutter is opened when the process cartridge is mounted in the mounting portion 51 of the image forming apparatus as described above, the image forming with the crocodile opening configuration is performed. In the device, with the process cartridge mounted in the mounting portion 51, external light comes in through the exposure opening each time the upper frame is opened for jam processing, etc., which accelerates deterioration of the photoconductor. It was something that ended up.

The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an image forming apparatus having a good cartridge operability.

Another object of the present invention is to provide an image forming apparatus capable of preventing deterioration of the image carrier of the mounted process cartridge.

[0013]

A first structure according to the present invention for achieving the first object is an image forming apparatus for mounting a process cartridge to form an image on a recording medium. Body and a second frame body that is openable and closable with respect to the first frame body and has a mounting portion for mounting the process cartridge; and the mounting portion when the second frame body is closed. It is characterized in that a positioning means for positioning the mounted process cartridge is provided.

A second structure according to the present invention for achieving the second object is an image forming apparatus for forming an image on a recording medium by mounting a process cartridge having a shutter capable of opening and closing an exposure opening. In a state in which the first frame body, the second frame body that can be opened and closed with respect to the first frame body, and has a mounting portion for mounting the process cartridge, and the second frame body are closed, A shutter opening / closing means for opening the shutter of the process cartridge mounted on the mounting portion and closing the shutter when the second frame is opened is provided.

[0015]

In the first structure, the process cartridge is inserted into the mounting portion with the second frame opened, and the process cartridge is positioned when the second frame is closed. The load for positioning is not applied, and the cartridge mounting operability is improved.

Further, in the second configuration, when the second frame having the process cartridge mounted thereon is opened, the opening shutter for exposure is closed. Therefore, even if the second frame is opened for jam processing or the like, the cartridge is opened. External light does not enter the inside through the opening, and deterioration of the image carrier is prevented.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, as an embodiment of the present invention, an image forming apparatus in which a process cartridge can be mounted will be specifically described with reference to the drawings.

[First Embodiment] A first embodiment will be described with reference to FIGS. 1 to 6. 1 is an explanatory view of the structure of a copying machine as an image forming apparatus equipped with a process cartridge, FIG. 2 is an explanatory view of the structure of a process cartridge, and FIG. 3 is an image forming apparatus with an upper frame opened. 4 and 5 are explanatory views of the configuration of the positioning means of the process cartridge, and FIG. 6 is an explanatory view of the opening / closing configuration of the exposure shutter.

Here, as the order of explanation, FIG. 1 and FIG.
The overall configuration of the image forming apparatus in which the process cartridge is mounted will be described with reference to FIG. 3, the positioning configuration of the process cartridge will be described with reference to FIGS. 3 to 5, and the exposure shutter will be described with reference to FIG. The open / close configuration will be described.

{Overall Configuration} This image forming apparatus A is shown in FIG.
As shown in FIG. 1, a light image based on image information is emitted from the reading unit 1 to form a latent image on the photosensitive drum, which is an image carrier, and the latent image is formed as a toner image on the recording medium 2 by the developing unit. It is to be transcribed.

(Structure of Image Forming Apparatus Main Body) The reading means 1 scans the light source 1b and the scanning mirror 1c with respect to an original placed on the original glass 1a with the image surface facing downward,
The reflected light from the original is irradiated onto the photosensitive drum in the process cartridge B via the mirror 1c, the plurality of reflecting mirrors 1d1 to 1d5 and the focusing lens 1e to form a latent image. The latent image is visualized as a toner image by the developing means.

On the other hand, in synchronization with the formation of the image, the recording medium 2 is conveyed from the cassette 3a to the pickup roller 3b, the reversing roller 3c, the conveying roller pair 3d1 and 3d2, and the registration roller pair 3e1 and 3e2. The toner image formed on the photosensitive drum is transferred to the recording medium 2 by applying a voltage to the transfer roller 4 serving as a transfer unit in the image forming unit which is conveyed by the process cartridge B and is formed into a cartridge as the process cartridge B. The medium 2 is conveyed by a conveyor belt 3f to a fixing rotator 5 having a heater 5a
b, and the recording medium 2 is conveyed to the fixing means 5 composed of a driving roller 5c which conveys the recording medium 2 by pressing it against the rotating body 5b, and fixes the transferred toner image on the recording medium 2. And this recording medium 2
Is discharged to the discharge tray 7 by the pair of discharge rollers 3g1 and 3g2. The recording medium 2 can be supplied not only from the cassette 3a but also from the manual feed tray 3h to the conveying roller pairs 3d1 and 3d2 by the feeding roller 3i.

(Structure of Process Cartridge) On the other hand, as shown in FIG. 2, in the process cartridge B forming the image forming portion, the photosensitive drum 8 as an image bearing member having a photosensitive layer is rotated and its surface is fixed. It is uniformly charged by applying a voltage to a charging roller 9 which is a charging means, and an optical image from the reading means 1 is exposed on a photosensitive drum 8 through an exposure opening described later to form a latent image and development. The means 10 is used for developing. The developing means 10 sends out the toner in the toner reservoir 10a by the toner feeding member 10b,
The developing sleeve 10d containing the fixed magnet 10c is rotated, and a toner layer to which a triboelectric charge is applied by the developing blade 10e is formed on the surface of the developing sleeve 10d, and the toner is transferred to the photosensitive drum 8 according to the latent image. By transferring, a toner image is formed and visualized. Then, after applying a voltage having a polarity opposite to that of the toner image to the transfer roller 4 to transfer the toner image to the recording medium 2, the cleaning blade 11a scrapes off the toner remaining on the photosensitive drum 8 and scoops it with the squeeze sheet 11b. The residual toner on the photoconductor drum 8 is removed by the cleaning means 11 that collects and collects the waste toner in the waste toner reservoir 11c.

Each component such as the photosensitive drum 8 is housed in a housing in which an upper container 12 and a lower container 13 are combined to form a cartridge, and an exposure opening is provided above the photosensitive drum 8. And a transfer opening is provided below. An exposure shutter 14 is openably and closably provided in the exposure opening, and a drum shutter 15 is similarly openably and closably provided in the transfer opening.

The process cartridge B is an apparatus main body 16
It is removably mounted by the cartridge mounting means provided in.

(Structure of Cartridge Mounting Section) Next, a mounting structure for mounting the process cartridge B in the image forming apparatus A will be described.

As shown in FIG. 3, the image forming apparatus A comprises a lower frame body 17 which is a first frame body and an upper frame body 18 which is a second frame body, and constitutes an apparatus main body. The body 18 is configured to be rotatable around a rotation support shaft 19, and is configured to be opened and closed with respect to the lower frame body 17 in a so-called crocodile shape. And the upper frame
A cartridge mounting portion 20 is provided at 18.

As shown in FIGS. 3 and 4, the cartridge mounting portion 20 is provided with two guide plates 20a1 and 20a2 facing each other with an interval corresponding to the width of the cartridge B from the upper frame 18. The tips of the guide plates 20a1 and 20a2 are bent inward to form locking portions 20b1 and 20b2. On the other hand, at the front end (left side in FIG. 2) and the rear end (right side in FIG. 2) of the process cartridge B, the locking portions 20b1 and 20b2 are respectively provided.
The insertion protrusions 21a and 21b that can be locked to the cartridge B are provided long in the longitudinal direction of the cartridge B.

Therefore, when the process cartridge B is mounted on the image forming apparatus A, the upper frame 18 is opened and the convex portions 21a and 21b of the cartridge B are locked to the mounting portions 20b1 and 20b.
It can be mounted on the mounting portion 20 by locking it on b2, pushing it in as it is, and slidingly inserting it. Further, the cartridge B can be easily removed by pulling it out.

Since the engaging portions 20b1 and 20b2 have different heights (see FIG. 1), the process cartridge B cannot be inserted in the opposite direction, and the cartridge B is erroneously attached. There is nothing to do.

{Structure of Cartridge Positioning Unit} The process cartridge B mounted on the mounting portion 20 has an upper frame body.
When 18 is closed, the upper frame body is moved by the positioning means described below.
Positioned with respect to 18.

As shown in FIGS. 3 and 4, the lower frame 17 has a pressing member having a length substantially the same as the width of the cartridge B.
22 is provided so as to be urged upward by a spring 23, and the pressing member 22 abuts a stopper 24 provided on the lower frame body 17 when the upper frame body 18 is opened. That is, the pressing member 22 can move up and down within a range regulated by the stopper 24, and by attaching the transfer roller 4 to the pressing member 22, the transfer roller 4 can be pressed against the photosensitive drum 8.

As shown in FIGS. 4 and 5, both end portions in the width direction of the process cartridge B (the cartridge mounting portion
At the front and rear ends in the direction of insertion into 20, the positioning projections 25
a and 26a are provided, a positioning recess 25b into which the projection 25a can be fitted is provided on the back side of the cartridge mounting portion 20, and a cartridge projection 26 is provided on the upright wall 22a of the pressing member 22.
A U groove 26b into which a can be fitted is provided. Further pressing member 22
Fitting protrusions 27a and 28a are provided at predetermined positions on the upper end of
When the upper frame 18 is closed, the fitting recesses 27b, 28 provided in the frame 18
It is configured to be fitted in b.

In the positioning means constructed as described above, when the process cartridge B is inserted into the mounting portion 20, the convex portion 25a at the front end of the cartridge becomes the concave portion 25b of the upper frame 18.
Fit in. At this time, the rear portion of the cartridge is not positioned.

Next, when the upper frame 18 is closed, the convex portion 26a at the rear end of the cartridge is fitted into the U groove 26b of the pressing member 22 to position the cartridge in the front-back direction.
The cartridge B is pressed against the upper frame 18 by the urging force of the pressing member 22, and the cartridge is vertically positioned.

When the upper frame 18 is closed, the pressing member 22
The fitting convex portions 27a, 28a of the above are fitting concave portions 27b, 28b of the upper frame body 18.
The pressing member 22 is positioned by being fitted into.

By configuring the cartridge positioning means as described above, the process cartridge B is mounted on the mounting portion.
Since it is not necessary to position the rear part in the insertion direction at the stage of inserting the cartridge B, the cartridge B can be smoothly inserted, and the upper frame 18 can be completely positioned with respect to the upper frame 18 by closing it. Therefore, the mounting operability of the cartridge B is improved.

{Structure of exposure shutter opening / closing means} When the process cartridge B is mounted on the mounting portion 20 and the upper frame 18 is closed, the exposure shutter opening / closing means to be described below opens the exposure shutter 14 to open the photosensitive drum. 8 can be exposed.

As shown in FIG. 2, the exposure shutter 14 provided in the process cartridge B is rotatable about a shaft 14a, and the shutter 14 is always rotated by a torsion coil spring 14b attached to the shaft 14a. Is biased in the direction of closing the exposure opening. When the shutter 14 is pressed from above against the bias, the shutter 14 rotates to open the exposure opening.

Now, as a structure for opening and closing the shutter 14, the upper frame body in this embodiment is as shown in FIG.
An opening / closing member 30 rotatable about a shaft 29 is attached to the shaft 18, and a tension spring 31 urges the opening / closing member 30 in the arrow direction of FIG. Further, the upper frame 18 is provided with a stopper 32, and when the upper frame 18 is opened, the opening / closing member 30 is provided with the stopper 32.
The rotation is regulated by abutting against.

As shown in FIG. 6 (b), one end of the opening / closing member 30 engages with an engaging portion 22b provided on the standing wall 22a of the pressing member 22 while the upper frame 18 is being closed, When the frame body 18 is completely closed, the opening / closing member 30 rotates, and its rotating end portion pushes down the exposure shutter 14. This opens the exposure aperture,
Image exposure on the photosensitive drum 8 is possible.

When the upper frame 18 is opened, the opening / closing member 30 is no longer engaged with the engaging portion 22b.
It rotates until it contacts the stopper 32 by the urging force of
As shown in (a), since the pressing of the shutter 14 of the process cartridge B is released, the shutter 14 closes the exposure opening.

Therefore, since the shutter 14 closes the exposure opening when the upper frame 18 is opened, even if the upper frame 18 is opened for jam processing or the like, outside light is emitted from the cartridge B through the exposure opening. It does not enter inside, and deterioration of the photosensitive drum 8 is prevented.

Further, as in the conventional case, the process cartridge B
Since the shutter 14 is not pushed open when the cartridge is inserted into the mounting portion 20 of the upper frame 18, the load for inserting the cartridge into the mounting portion 20 is small, which also improves the operability of the cartridge mounting.

[Second Embodiment] In the above-described first embodiment, as shown in FIG. 5, the positioning means for the process cartridge B is provided with projections 25a provided at both ends in the insertion direction of the cartridge B,
U-groove with 26a provided in the recess 25b of the upper frame 18 and the pressing member 22
An example is shown in which they are fitted to 26b respectively.
It may be configured as shown in.

The cartridge positioning structure shown in FIG.
The upper frame 18 is similar to the first embodiment in that the cartridge mounting portion 20 is provided, but at the predetermined position of the mounting portion 20, when the process cartridge B is inserted into the mounting portion 20, the front end in the cartridge insertion direction is A stopper 33 that abuts and restricts further insertion is provided, and the pressing member 22 is provided with a standing wall at a distance substantially the same as the width L of the process cartridge B.
34a and 34b are provided.

In the above structure, the process cartridge B is inserted into the mounting portion 20 of the upper frame 18 and the insertion tip is brought into contact with the stopper 33. Next, when the upper frame 18 is closed, the process cartridge B enters between the upstanding walls 34a and 34b of the pressing member 22, and both ends in the width direction of the cartridge B are the upstanding walls.
Positioning is performed so as to come into contact with 34a and 34b.

By doing so, when the process cartridge B is inserted into the mounting portion 20, it is sufficient to insert the process cartridge B until it comes into contact with the stopper 33, so that the insertion load of the cartridge is reduced and the mounting operability is further improved. improves.

In FIG. 7, the standing wall 34 of the pressing member 22 is
The convex portions 35a and 35b provided on the upper ends of the a and 34b are upper frame members.
When the 18 is closed, the pressing member 22 is positioned by fitting into the recesses 36a and 36b of the mounting portion 20.

[Third Embodiment] In the first embodiment described above,
An example in which the opening / closing member 30 is rotatably attached in order to open / close the exposure shutter 14 is shown, but it may be configured as shown in FIG. 8.

The structure shown in FIG. 8 has the opening / closing member of the first embodiment.
Instead of 30, a torsion coil spring 38 serving as an opening / closing member is rotatably attached to the shaft 37. With this structure, when the process cartridge B is inserted into the mounting portion 20 of the upper frame 18, even if the exposure shutter 14 hits the torsion coil spring 38, the spring 38 is exposed as shown in FIG. 8A. Since it is rotatable, it does not rotate and run away and get caught in the cartridge B, nor does it increase the cartridge insertion load.

When the upper frame 18 is closed, as shown in FIG.
As shown in (b), one end of the torsion coil spring 38 engages with the engaging portion 22b of the pressing member 22, and the spring 38 rotates in the clockwise direction. As a result, the rotating end of the spring 38 pushes down the exposure shutter 14 of the process cartridge B to open the exposure opening. On the other hand, when the upper frame 18 is opened, as shown in FIG. 8A, the engagement with the engaging portion 22b is lost, so that the spring 38 is in a free state and the exposure shutter 14 is not pushed down. As described above, the shutter 14 closes the exposure opening by biasing the torsion coil spring 14b (see FIG. 2).

With this structure, the exposure shutter 14 can be opened / closed according to the opening / closing of the upper frame 18 with a simpler structure than that of the first embodiment.

[Fourth Embodiment] In the third embodiment described above,
Although an example is shown in which the exposure shutter 14 is opened and closed by the torsion coil spring 38, a spring member (not shown) similar to the torsion coil spring 38 is provided in the upper frame body 18, and the upper frame body is provided.
If one end of the spring member serving as the pressing member is engaged with the engaging portion 22b of the pressing member 22 and the other end of the spring member pushes down the upper surface of the process cartridge B when the 18 is closed, Since the convex portion 26a of the process cartridge B is pressed against the U groove 26b of the pressing member 22 when the upper frame 18 is closed, the positioning of the cartridge B becomes more reliable.

Further, without using a separate member as described above,
As shown in FIG. 9, a shaft 39 provided on the upper frame 18 (not shown)
A twisting coil spring 40 is rotatably attached to the twisting coil spring 40. The twisting coil spring 40 is provided with a pressing portion 40a of the exposure shutter 14 and a pressing portion 40b of the process cartridge B. Alternatively, the exposure shutter 14 may be opened and closed and the cartridge B may be pressed.

When the process cartridge B is inserted into the mounting portion 20 (not shown) of the upper frame body 18 as shown in FIG. 9A when the upper frame body 18 is opened, the torsion coil spring 40 is opened. Even when the exposure shutter 14 hits the torsion coil spring 40, the spring 40 does not rotate and escape and get caught in the cartridge B. Then, when the upper frame 18 is closed, as shown in FIG.
As shown in (b), one end of the spring 40 engages with the engaging portion 22b of the pressing member 22 and rotates, and the pressing portion 40a is exposed.
While pressing down 14 to open the exposure opening, the pressing portion 40b presses the upper surface of the process cartridge B downward to press the cartridge convex portion 26a against the U groove 22b of the pressing member 22 and position it.

As a result, the exposure shutter is provided by one component of the torsion coil spring 40, that is, by a simpler structure.
It is possible to open and close 14 and position the process cartridge B.

[Other Embodiments] Further, in the above-mentioned embodiments, an electrophotographic copying machine was illustrated as an image forming apparatus, but the present invention is not limited to this, and for example, a laser beam printer, a facsimile machine, a word processor, etc. Of course, it can be used in other image forming apparatuses.

[0059]

As described above, according to the present invention, the process cartridge is inserted into the mounting portion with the second frame opened and the cartridge is inserted when the second frame is closed. Occasionally, a positioning load is not applied, and the cartridge mounting operability is improved.

Further, when the second frame is closed, the pressing member is rotated to press the process cartridge toward the first frame, so that the process cartridge can be reliably positioned. .

In addition, a second cartridge equipped with a process cartridge
Since the opening shutter for exposure is closed when the frame is opened, external light does not enter the cartridge through the opening even when the second frame is opened for jam processing or the like.
It is possible to prevent deterioration of the image carrier.

When the second frame is closed, the cartridge is positioned and the opening shutter for exposure is opened, so that the mounting operability of the cartridge is improved and the deterioration of the image carrier is prevented. The effect of can be obtained. Further, by configuring the positioning and opening / closing of the shutter by one member, the same effect can be obtained with a simpler configuration.

Further, when the second frame is closed, the opening / closing member is rotated to open the shutter.
The shutter opening / closing means can be easily configured.

[Brief description of drawings]

FIG. 1 is a configuration explanatory diagram of a copying machine as an image forming apparatus in which a process cartridge is mounted.

FIG. 2 is an explanatory diagram of a configuration of a process cartridge.

FIG. 3 is a configuration explanatory view of the image forming apparatus with an upper frame body opened.

FIG. 4 is a perspective view illustrating a mounting configuration of a process cartridge.

FIG. 5 is an explanatory diagram of a positioning configuration of a process cartridge.

FIG. 6 is an explanatory diagram of an opening / closing configuration of an exposure shutter.

FIG. 7 is an explanatory diagram of another embodiment of the positioning configuration of the process cartridge.

FIG. 8 is an explanatory diagram of another embodiment of the exposure shutter opening / closing configuration.

FIG. 9 is an explanatory diagram of an embodiment in which the exposure shutter is opened and closed and the cartridge is pressed by one member.

FIG. 10 is an explanatory diagram of a positioning configuration of a cartridge according to a conventional technique.

[Explanation of symbols]

A ... Image forming apparatus, B ... Process cartridge, 1 ... Reading means, 1a ... Original glass, 1b ... Light source, 1c ... Scanning mirror, 1d1 to 1d5 ... Reflecting mirror, 1f ... Lens, 2 ... Recording medium, 3 ... Conveying means 3a ... Cassette, 3b ... Pickup roller, 3c ... Reversing roller, 3d1, 3d2 ... Conveying roller, 3e1, 3e2 ... Registration roller, 3f ... Conveying belt, 3g1, 3g2 ... Ejecting roller, 3h ... Manual feed tray, 3
i ... feeding roller, 4 ... transfer roller, 5 ... fixing means, 5a
... Heater, 5b ... Fixing rotor, 5c ... Drive roller, 6 ...
Reverse conveyance path, 7 ... Ejection tray, 8 ... Photosensitive drum, 9
... charging roller, 10 ... developing means, 10a ... toner reservoir, 10b
... Toner feeding member, 10c ... Magnet, 10d ... Developing sleeve,
10e ... Developing blade, 11 ... Cleaning means, 11a ... Cleaning blade, 11b ... Squeeze sheet, 11c ... Waste toner reservoir, 12 ... Upper container, 13 ... Lower container, 14 ... Exposure shutter, 14a ... Shaft, 14b ... Twist Coil spring, 15 ... Drum shutter, 16 ... Device body, 17 ... Lower frame body, 18 ... Upper frame body, 19 ...
Rotating support shaft, 20 ... Mounting part, 20a1, 20a2 ... Guide plate, 20b1,
20b2 ... Locking portion, 21a, 21b ... Inserting convex portion, 22 ... Pressing member,
22a ... Standing wall, 22b ... Engaging part, 23 ... Spring, 24 ... Stopper, 25a ... Convex part, 25b ... Recessed part, 26a ... Convex part, 26b ... U
Grooves, 27a, 28a ... Fitting projections, 27b, 28b ... Fitting recesses, 29
... Shaft, 30 ... Opening / closing member, 31 ... Tension spring, 32 ... Stopper, 33
... Stoppers, 34a, 34b ... Standing walls, 35a, 35b ... Projections,
36a, 36b ... Recessed portion, 37 ... Shaft, 38 ... Torsion coil spring, 39
… Shaft, 40… Torsion coil spring, 40a, 40b… Pressing part

Claims (8)

[Claims] 1. An image forming apparatus in which a process cartridge is attachable / detachable and forms an image on a recording medium, wherein a first frame and a first frame are relatively openable / closable, An image including: a second frame body having a mounting portion for mounting; and a positioning means for positioning the process cartridge mounted in the mounting portion when the second frame body is closed. Forming equipment. 2. The image forming apparatus according to claim 1, wherein the positioning unit is configured to position the process cartridge with respect to the second frame when the second frame is closed. apparatus. 3. The positioning means is configured such that, when the second frame is closed, a pressing member is rotated to press the process cartridge against the first frame to position the process cartridge. The image forming apparatus according to claim 2. 4. An image forming apparatus for forming an image on a recording medium, wherein a process cartridge having a shutter capable of opening and closing an opening for exposure is attachable / detachable, and a first frame body, and relatively to the first frame body. A second frame body that is openable and closable and has a mounting portion for mounting the process cartridge; and a shutter of the process cartridge mounted in the mounting portion is opened when the second frame body is closed, An image forming apparatus, comprising: a shutter opening / closing means for closing the shutter when the frame is opened. 5. The image forming apparatus according to claim 4, wherein the shutter opening / closing unit is configured to open the shutter by rotating an opening / closing member when the second frame is closed. 6. An image forming apparatus in which a process cartridge having a shutter capable of opening and closing an exposure opening can be attached and detached and which forms an image on a recording medium, wherein a first frame body and a relative position to the first frame body are provided. A second frame body that is openable and closable and has a mounting portion for mounting the process cartridge; and positioning means for positioning the process cartridge mounted in the mounting portion when the second frame body is closed. And a shutter opening / closing means for opening the shutter of the process cartridge mounted on the mounting portion when the second frame is closed, and for closing the shutter when the second frame is open. A characteristic image forming apparatus. 7. The positioning means and the shutter opening / closing means are formed of the same member.
The image forming apparatus described. 8. The positioning means has a pressing member for pressing the process cartridge against the first frame body when the second frame body is closed, and the shutter opening / closing means rotates when the second frame body is closed. 8. The image forming apparatus according to claim 7, further comprising an opening / closing member, wherein the pressing member and the opening / closing member are formed of the same member.