JPH0439667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention relates to a paper conveyance device for conveying paper to the recording medium in an image forming apparatus that includes a recording medium and transfers an image on the recording medium.

<Prior Art> An electrophotographic copying machine, which is an image forming apparatus, is equipped with a recording medium having a photoconductive layer, a so-called photoreceptor.
This photoreceptor is formed, for example, in the shape of a drum, and an image forming device is disposed around the periphery of the photoreceptor in opposition to the photoreceptor. Therefore, an electrostatic latent image is formed on the surface of the photoreceptor by being charged and imagewise exposed. The electrostatic latent image is developed by a developing device, and the developed image (toner image) is transferred onto a transfer material that is sent as appropriate. After the image is transferred, some of the image (toner) remains on the photoreceptor, and by removing this toner, the photoreceptor is prepared for the next image formation. A cleaning device is provided opposite the photoreceptor to remove toner on the photoreceptor.

A photoreceptor for image formation is rotatably supported approximately at the center of the main body of the copying machine. When replacing or cleaning the photoreceptor, the photoreceptor is removed from the main body of the copying machine. The photoreceptor is taken out in an axial direction for rotating the photoreceptor. If you pull out the photoconductor in this way, when replacing it or installing the photoconductor after cleaning,
The surface of the photoreceptor is often soiled with dirt from hands. Further, a developing device, a cleaning device, etc. are provided opposite the photoreceptor. The developing device and the cleaning device are positioned at fixed positions relative to the photoreceptor, and it is very troublesome to adjust their positions. Furthermore, the developing device and the like are configured to be detachable from the copying machine main body in order to replace developer, replenish toner, and the like. Therefore, adjusting the mutual positional relationship was troublesome.

The above method involves attaching and detaching each device within the main body of the copying machine individually, and it is necessary to perform replacement etc. individually, and the attachment and detachment operations are very troublesome because positioning and the like are performed. Therefore, Japanese Patent Publication No. 58-54392 discloses a device in which a part of the device facing the photoreceptor is integrated and the integrated device is replaced. In this system, a photoreceptor, a developing device, and a cleaning device are attached to the same support member, and this support member is slidably attached to and detached from the main body of the copying machine. In this case, since the photoreceptor, the developing device, and the cleaning device are positioned and attached to the support member, there is no need to adjust their relative positions when they are attached, and the replacement operation becomes very simple. However, even if it is not possible to replace only the photoconductor and other devices can be used,
It is extremely uneconomical as other equipment must be replaced as well.

Furthermore, in processing jammed paper, even if a unit that integrates a photoreceptor, a developing device, etc. is pulled out, the jammed paper cannot be removed. That is, since the paper is transported along the transport path, it is necessary to open this transport path. If the unit is pulled out during jamming, the jammed paper in the conveyance path may be torn, and the copying operation may start with the jammed paper stagnant at that position. Therefore, for jam processing, it is desirable to open the conveyance path and remove the jammed paper without pulling out the unit.

Conventionally, in order to open the transport path, there is a copying machine whose main body is divided into upper and lower parts along the transport path. However, if it cannot be divided into upper and lower sections, it is necessary to separately open the conveyance path. Therefore, a conveyance path for conveying the paper to a transfer position facing the photoreceptor and a conveyance path for conveying the paper after transfer are individually openable. In cases where each transport path is opened individually, not only is it troublesome to open all the transport paths, but the copying operation may be started with the transport paths left open. , creating the cause of the occurrence of Siyam.

<Purpose> The present invention conveys paper to a transfer position of a recording medium,
It is an object of the present invention to reliably and easily process jammed paper in a paper transport device that transports jammed paper from a transfer position to another process.

Another object of the present invention is to simplify the opening process of the paper conveyance path and the post-processing after the jam removal in order to facilitate the jam removal.

<Example> FIG. 1 is a sectional view showing an electrophotographic copying machine according to the present invention. In the figure, 1 is an original platen made of a transparent glass plate for placing a copied original, 2 is an automatic document feeder (ADF) installed on the original platen, and 3 records the reflected light image from the original on the original platen. an optical system including a lens 4 for forming an image on the surface of a photoreceptor, which is a medium;
5 is a drum-shaped photoreceptor having a photoconductive layer made of arsenic selenium (As ₂ Se ₃ ), etc., 6 is a main corona discharger that uniformly charges the photoreceptor to a specific polarity, and 7 is the optical system mentioned above. exposure position on the photoconductor,
8 is a developing device that develops the electrostatic latent image formed on the photoreceptor with colored toner, and 9 is a transfer device that transfers the developed toner image on the photoreceptor onto a sheet of paper that is appropriately fed via a synchronous roller 10. 11 is an AC corona discharger for electrostatically peeling paper from the photoreceptor; 12 is an AC corona discharger for removing charges remaining on the photoreceptor; 13 is for removing toner remaining on the photoreceptor; A cleaning device 14 is a static eliminating lamp for making the surface potential of the photoreceptor uniform prior to the next image formation, and 15 is a non-image area erasing lamp for removing charges in unnecessary areas of the photoreceptor after uniform charging.

Further, the electrostatic attraction force of the transferred paper to the photoreceptor 5 is weakened by the action of the AC corona discharger 11, and the paper is peeled off from the photoreceptor 5 due to the stiffness of the paper itself. This peeled paper is conveyed by a conveyor belt 16 provided between the peeling position and the fixing roller 17. The conveyor belt 16 is equipped with an air suction means for sucking the back side of the paper, that is, the opposite side to the side supporting the toner image, onto the belt, and the conveyor belt 16 fixes the paper without disturbing the toner image. It is conveyed to rollers 17. Further, the fixing roller 17 is, for example, a thermal fixing roller whose surface facing the toner is heated to a temperature capable of fixing the toner, and thermally fixes the toner image onto the conveyed paper. A paper discharge roller 18 is provided at the paper output portion of the fixing roller 17, and the paper sent through the fixing roller 17 is delivered to the paper discharge tray 1 via the paper discharge roller 18.
It is discharged at 9.

The above-mentioned paper is stored in a paper feed cassette 20, a paper feed table 21, a paper feed tray 22, etc. that can be attached to and removed from the main body of the copying machine, and paper feed rollers 23, 24, 25, By selectively driving 26, it is sent to the synchronous roller 10. The paper fed to the synchronous roller 10 is driven to the transfer position in synchronization with the rotation of the photoreceptor 5. That is, the synchronous roller 10 is driven and controlled in synchronization with the rotation of the photoreceptor 5 etc. so that the image forming edge of the photoreceptor 5 and the leading edge of the paper coincide at the transfer position.

In the copying machine having the structure described above, the photoreceptor 5 is provided so as to be able to be pulled out in the axial direction. As shown in FIG. 2, the photoreceptor 5 is attached to a support frame 28 that constitutes a process unit that is slidably provided to the main body of the copying machine using a slide member 27.
The photoreceptor mounting member 29 is attached to the photoreceptor mounting member 29 . In addition to the photoreceptor 5, the support frame 28 is provided with some devices that are provided opposite the photoreceptor and perform image formation. That is, the support frame 2
The devices disposed at 8 are a main corona discharger 6, a developing device 8, a cleaning device 13, a static elimination lamp 14, and a non-image area erasing lamp 15. Here, since the AC corona discharger 12 for static elimination is provided with the AC corona discharger 11 for peeling and the static elimination lamp 14, there is no problem in image formation even if the AC corona discharger 12 is not provided.

As shown in FIG. 3, the photoreceptor 5 is held rotatably by a shaft 30, and the shaft 30 is fixed to a photoreceptor mounting member 29. As shown in FIG. This photoconductor mounting part 2
9 is rotatably supported by the support frame 28 via a shaft 31. One end of the shaft 31 passes through the support frame 28, and a manual knob 32 for rotating the photoreceptor is attached to this protrusion. A transmission member (not shown) is attached that couples with the driving force transmission member provided on the side. The shaft 31 also has a gear 33 for rotating the photoreceptor 5.
is fixed.

Further, as shown in the cross-sectional view of FIG. 4, the photoreceptor 5 is
It is held between flanges 36 and 37 provided on the shaft 30 via bearings 34 and 35. A gear 38 for rotating the photoreceptor is attached to the bearing 34 to which the flange 36 is attached, and this gear 38 meshes with the gear 33. Therefore, the shaft 31 is driven by the driving force transmitted from the manual knob 32 or the copying machine main body.
, the photoreceptor 5 is rotated via the gears 33 and 38. The flange 36 is the shaft 30
A bearing 34 is fixed at the top, that is, a bearing 34 is fixed at the position shown in the figure, and a flange 37 is provided so as to be movable along the shaft 30. A fixing member 39 for fixing the photoreceptor is screwed onto the shaft 30 in correspondence with the flange 37 . When the fixing member 39 is tightened in the left direction, the photoreceptor 5 is firmly fixed between the flanges.
When this fixing member 39 is removed from the shaft 30,
The flange 37 can be removed from the shaft 30,
The photoreceptor 5 held between the flanges can be removed and replaced with a new one.

D-cuts 40 are provided at both ends of the rotation center axis 30 of the photoreceptor 5 for attaching the photoreceptor 5 to the mounting member 29.
is applied. Corresponding to this D-cut 40, on the mounting member 29 side, a shaft insertion opening 42 communicating with a hole 41 for holding the shaft 30 is formed so as to match the shape of the D-cut 40, as shown in FIG. . To attach and detach the shaft 30 holding the photoreceptor 5 to and from the mounting member 29, as shown in FIGS. Direct the communicating shaft insertion port 42 upward, and insert the D cut 40 of the shaft 30 into the insertion port 42.
It can be easily attached and detached by pulling out or inserting the shaft 30. At this time, if the shaft 30 is rotated counterclockwise, the D-cut 40 will be removed from the insertion opening 42 as shown in FIG. 6, and the shaft 30 will be held in the hole 41 and prevented from falling off. Therefore, in order to rotate the shaft 30, a lever 43 is fixed to the shaft 30, and as shown in FIG. will be retained.

The mounting member 29 for mounting the photoreceptor 5 includes:
A locking member 44 for holding the mounting member 29 in the open position (the state shown in FIG. 6) is provided so as to be freely retractable. The locking member 44 is attached to a shaft 45 rotatably provided on the attachment member 29,
It is configured to appear and disappear by rotating the shaft 45. A lever 46 for rotation is fixed to one end of the shaft 45. A knob 47 fixed to the mounting member 29 is provided corresponding to the lever 46. Therefore, by pinching between the lever 46 and the knob 47, the shaft 45 can be rotated and the locking member 44 will be depressed. A locking piece 48 is provided on the support frame 28 side corresponding to this locking member 44. Therefore, by rotating the mounting member 29 as shown in FIG. 6 and rotating the lever 46, the locking member 44 can be locked to the locking piece 48.
The mounting member 29 can be held in that position. In the released state shown in FIG. 6, the surface of the photoreceptor 5 is exposed, so that the surface of the photoreceptor 5 can be easily polished. At this time, in order to polish the entire surface of the photoreceptor 5,
The photoreceptor 5 may be rotated manually using the knob 32. Thereby, when cleaning the surface of the photoreceptor 5, the photoreceptor 5 can be cleaned without removing the photoreceptor itself and can be cleaned while being held, so that the photoreceptor 5 can be easily and reliably cleaned without staining the photoreceptor 5 with hand marks. In this case, the photoconductive layer of the photoreceptor 5, such as As ₂ Se ₃ , is coated on the Al surface with a thickness of about 60 μm, and is polished by about 0.2 to 0.5 μm during one cleaning (polishing). be done.

Further, the attachment member 29 also attaches devices other than the photoreceptor 5. As shown in FIG.
4. Main corona discharger 6 that uniformly charges the photoreceptor 5
a discharger guide member 49 for detachably holding the discharger, and a non-image area erasing lamp 15. A positioning shaft 50 for ensuring the positional relationship between the developing device 8 and the photoreceptor 5 is attached to the attachment member 29.

Next, the electrostatic latent image formed on the surface of the photoreceptor 5 is
The developing device 8 that performs development will be explained. As shown in FIG. 7, the developing device 8 has a developer tank 51 and a toner hopper 52 integrally formed using screws, etc., and a developer tank 51 and a toner hopper 52 are integrally formed with each other using screws or the like. A spacing collar 53 is rotatably mounted to maintain the spacing. Furthermore, a guide member 54 for horizontally moving the developing device 8 itself is integrally formed on the side surface of the developing tank 51. A positioning portion 55 is formed at the leading end of the developer tank 51 in correspondence with a positioning shaft 50 provided on the mounting member 29 of the photoreceptor 5, and a developing device 8 is formed at the rear end.
The engaging part 5 for moving the
6 is integrally formed.

Inside the developing device 8, that is, inside the developing tank 51, the eighth
As shown in the cross-sectional view, a developing roller 57 and stirring rollers 58 and 59 for stirring the developer are rotatably provided. The developing roller 57 has a magnet provided in a cylindrical non-magnetic sleeve, and for example, by rotating the sleeve, the developer attracted onto the sleeve is conveyed by magnetic force to a developing area facing the photoreceptor 5. It turns out. As a result, the electrostatic latent image formed on the photoreceptor 5 is developed. Stirring rollers 58 and 5 provided opposite this developing roller 57
9 is a toner replenishing roller 6 from the toner hopper 52;
This stirs the toner supplied through the roller 0 and sends it to the developing roller 57.

As shown in the side view of FIG. 9, the developing roller 57 and stirring rollers 58, 59 are meshed with gears 61, 62, 63 fixed to one end of each rotating shaft. A gear 63 on the stirring roller 59 is in mesh with a gear 64 rotatably provided at a fixed position on the support frame 28 when the developing device 8 is moved to a position away from the developing area with the photoreceptor 5. be. The developing device 8 can be attached and detached from above when the supporting frame 28 is pulled out and the developing device 8 is moved to a position outside the developing area as shown in FIG. For this purpose, a positioning lever 65 for moving the developing device is provided on the support frame 28 side. The positioning lever 65 is attached to the support frame 2
A shaft 67 provided in a long hole 66 (see FIG. 10) formed in 8 is passed through, and a gear 68 is fixed to this shaft 67 in correspondence with a gear 64 provided at a fixed position on the support frame 28. has been done. The positioning lever 65 is rotatably provided around a shaft 69. The shaft 69 is movably provided in a long hole 70 formed in the support frame 28, and is constantly urged downward by a biasing means (not shown). Therefore, by rotating the positioning lever 65, the shaft 67 is aligned with the elongated hole 6 formed in the horizontal direction.
It will move along 6. A long hole 70 formed perpendicular to the long hole 66 compensates for this horizontal movement.

The shaft 67 is provided to correspond to the engaging portion 56 of the developing device 8, and is engaged with the engaging portion 56 as shown in FIG. 7 when the developing device 8 is attached to the support frame 28. match. This is because when the positioning lever 65 is rotated and the shaft 67 is positioned as shown in FIG. will be combined. Further, a support frame 28 is provided corresponding to a guide member 54 provided on the side surface of the developer tank 51.
A guide body 71 shaped to sandwich the guide member 54 is provided on the side. When the developing device 8 is installed, the guide member 54 is supported by the guide body 71a on the support frame side. When the lever 65 is rotated clockwise, the developing device 8 is moved to the left along the guide body 71, the spacing collar 53 comes into contact with the periphery of the photoreceptor 5, and the positioning portion 5
5 comes into contact with the shaft 50, and the positioning of the developing device 8 is completed. At this time, the developing device 8
In addition to guaranteeing the distance from the photoreceptor 5,
The shaft 50 and the positioning part 55 allow reliable positioning, and the distance from the photoreceptor 5 will not shift due to vibrations such as up and down. In this state, the gear 63 and the like mesh with the driving force transmission means on the copying machine main body side, and the developing roller 57 and the like are rotated.

Further, the developing device 8 rotates the positioning lever 65 to the position shown in FIG.
This makes it possible to separate from the support frame 28. In this position, as explained earlier, the shaft 6
The gear 68 of No. 7 meshes with the gear 64 of the support frame 28, and this gear 64 meshes with the gear 63 of the developing device 8. Therefore, by rotating the shaft 67, the developing roller 57 and stirring roller 5 in the developing tank 51 can be rotated.
8 and 59 are rotated to stir the developer.
In order to perform this rotation, a manual stirring knob 72 is fixed to one end of the shaft 67.

Next, the paper is conveyed to the transfer position of the photoreceptor 5,
A paper transport system according to the present invention for transporting paper from this transfer position to other processes will be described in detail. First, in FIG. 11, sheets sent from each paper feed section are passed through transport rollers 87 and 89 arranged at a position where the transport paths of each paper feed section merge.
It is fed into the synchronous roller 10. As described above, the synchronous roller 10 transports the paper in synchronization with the image forming tip of the photoreceptor 5 at the transfer position. The synchronous roller 10 is provided on the support frame 28 in the process unit, and feeds the paper to a transfer position facing the photoreceptor 5 via a conveyance path formed by guide plates 72 and 73. One end of the guide plates 72 and 73 is rotatably supported by the support frame 28 through shafts 74 and 75, and the other end extends to the peripheral surface of the transfer position of the photoreceptor 5. The guide plates 72 and 73 act so as to constantly hang downward about the shafts 74 and 75 due to their own weight. In order to hold this in the position shown in FIG. 11, it is held by a holding leaf spring 76. One end of the leaf spring 76 is fixed to a support 77 that supports the conveyor belt 16 and the air suction means, and its free end is fixed to the guide plate 73.
is held. Further, the guide plate 72
3, a constant interval is maintained by the spacing member 78, and the first
It is held in the position shown in Figure 1.

The support body 77 is rotatably supported by the copying machine main body around a shaft 79. The support body 77 includes a conveyance belt 16 for forming a conveyance path for conveying the paper, which has been peeled off from the photoreceptor 5 by the action of the AC corona discharger 11 after the transfer, to the fixing roller 17 . In addition to the conveyor belt, a transfer corona discharger 9 and an AC corona discharger 11 are attached to the support 77, including a guide member for attachment and detachment. The transfer corona discharger 9 and the peeling AC corona discharger 11 are integrally formed,
For example, it is attached to the support body 77 so as to be able to swing up and down with a sufficient margin. In order to perform positioning with the photoreceptor 5, an insulating member for fixing the discharge wire of each discharger 9, 11 is formed so as to match the shape of the corresponding portion 28a of the support frame 28. Therefore, if the support body 77 is positioned as shown in FIG.
The insulating members of the dischargers 9 and 11 come into contact with the portion 28a of the discharger 8, and positioning with the photoreceptor 5 is performed.

The support body 77 is held in the state shown in FIG. 11 by a support arm 81 rotatably supported by a shaft 80 on the main body of the copying machine in order to configure a paper conveyance path by the conveyance belt 16. ing. In order to hold the support body 77 from the back side, the support arm 81 is rotatably provided with rollers 82 at a portion that comes into contact with the back side of the support body 77. Although not shown, a knob for rotating the arm 81 is appropriately attached to the support arm 81. As a result, when the support arm 81 is rotated counterclockwise, the support body 77 hangs down around the shaft 79 due to its own weight, and the paper conveyance path in the conveyance belt 16 is opened as shown in FIG. 12.

On the other hand, a conveyance body 84 is connected to the support arm 81 to form a conveyance path for conveying the paper fed via the connecting piece 83 to the transfer position. Both ends of the connecting piece 83 are rotatably attached to the support arm 81 and the carrier 84. The conveyor 84 is rotatably provided on the main body of the copying machine about a shaft 840. One guide plate 85 is attached to this conveyance body 84, and guides the paper selected and fed from each paper feed unit explained in FIG. 1 to the synchronous roller 10 for sending it to the transfer position. ing. A guide plate 850 is provided on the copying machine main body side opposite to the guide plate 85 of the conveyor 84, and forms a conveyance path with the guide plate 85. In the conveyance path formed by these guide plates 85, 850, in particular, at the confluence point A of the conveyance path of the paper fed via any one of the paper feed rollers 23, 24, 25, 26, there is a synchronous roller 10. Conveyance rollers 87 and 89 are arranged to feed the paper to the paper. Here, the sheets fed by the sheet feed rollers 23 and 24 are sent as they are to the conveyance rollers 87 and 89 of the merging section A.
Further, the paper fed by the paper feed roller 25 passes through the guide plates 85 and 85 via the transport rollers 88 and 90.
It is conveyed into the conveyance path formed at 0. The transported paper is sent to the merging section A by transport rollers 86 and 88 arranged in the transport path of the guide plates 85 and 850. Further, the paper fed by the paper feed roller 26 is sent as it is into the transport path of the guide plates 85, 850, and is sent to the merging section A via the transport rollers 86, 88.

Each of the above-mentioned conveyance rollers, especially rollers 88 and 89
is a drive roller provided on the copying machine main body side to which driving force is transmitted. Roller 9 facing roller 88
0 is a driven roller, which is rotatably provided on the copying machine main body side together with the drive roller 88.
The rollers 86 and 87 provided opposite the drive rollers 88 and 89 are driven rollers, and
It is rotatably provided on the carrier 84 side.

In the above-described configuration, the support arm 81 is rotated counterclockwise in FIG. 11 when jamming the paper or pulling out the support frame 28. At this time, as shown in FIG. 12, the support body 77 hangs down clockwise around the shaft 79 due to its own weight, and the carrier 84 is rotated counterclockwise via the connecting piece 83. As a result, each conveyance path in the paper conveyance system is opened at the same time, making it easier to process jammed paper. Further, by hanging the support body 77, a guide plate 72, which guides the paper to the transfer position,
73 also droops due to its own weight. This drooping is regulated by a stopper 91 provided on the support frame 28. Therefore, the paper that is in close contact with the photoreceptor 5 etc. can be reliably peeled off, and the paper can be easily processed. The support frame 28 can be pulled out only when the support arm 81 is in the state shown in FIG. This is provided with a regulating member 92 on the support body 77,
This restricting member 92 makes it impossible to pull out the support frame 28. However, by releasing the transport system using the support arm 81, the restriction member 92 is released from the restriction position (the state shown in FIG. 12), and the support frame 28 can be pulled out.

On the other hand, when the support arm 81 is rotated clockwise, the support body 77 is lifted, and the guide plates 72 and 73 are pushed up by the leaf spring 76, and their tips are positioned near the transfer position facing the photoreceptor 5. . The guide plate 72 is a stopper 9 for positioning.
3, the position is determined.

Next, the cleaning device 13 for cleaning toner remaining on the photoreceptor 5 will be described.
The cleaning device 13 includes a cleaning blade 95 inside a box 94, and removes residual toner by bringing the tip of the cleaning blade 95 into pressure contact with the photoreceptor 5. This cleaning device 1
3 is also provided so as to be detachable from the support frame 28. To this end, the support frame 28
As shown in FIG. 5, the cleaner guides 96a, 9
6b are provided to sandwich the box 94 of the cleaning device 13. Cleaning device 1
As shown in FIG. 13, the box body 94 of No. 3 has a fixing engagement pin 97 fixed to its upper part, and has screw holes 98 for screwing into the cleaner guides 96a and 96b. On the other hand, an engagement hole 99 is formed in the cleaner guide 96a in correspondence with the engagement pin 97, as shown in FIG. This hole 99 is formed in an L-shape as shown in the figure. In the figure, 100 is a screw hole for screwing.

Support frame 28 of the cleaning device 13
To remove the box body 94, remove all the screws.
All you have to do is move it to the right with respect to the axis of the photoreceptor 1 and pull it out toward you. For mounting, the operation described above may be performed in reverse.

In the structure as described above, the operation when replacing or cleaning the photoreceptor 5 will be explained.
First, open the front door (not shown) of the copying machine,
The support arm 81 is rotated counterclockwise, and the support body 77 and the conveyance body 84 are also rotated to open the conveyance system. When the transport system is in the open state, the support frame 28 is pulled out toward the front door. This pulled out state is as shown in FIG.

Next, the positioning lever 65 provided on the pulled out support frame 28 is rotated counterclockwise. As a result, the developing device 8 is moved rightward in the figure (the state shown in FIG. 10) and is separated from the photoreceptor 5 by a large distance. In this state, the support frame 28
By removing the screws or the like fixing the space between the mounting member 29 of the photoreceptor 5 and the mounting member 29 of the photoreceptor 5, the mounting member 29 can be rotated around the shaft 31, for example, in a counterclockwise direction, as shown in FIG. As shown, the locking member 44 is connected to the locking piece 48.
is locked and held in that state.

When the mounting member 29 is opened as shown in FIG. 6, a part of the surface of the photoreceptor 5 is exposed. Therefore, the photoreceptor 5 can be cleaned while being attached to the attachment member 29. At this time, the photoreceptor 5 is rotated during cleaning, and in order to do this, it is rotated via the manual knob 32, and the entire area can be easily cleaned. Since the photoreceptor 5 can be cleaned while being held in this manner, there is no risk of staining the surface of the photoreceptor with hand marks, etc., and reliable cleaning is possible.

When replacing the photoreceptor 5, remove the screw 430 in the state shown in FIG. 6 and turn the lever 43 clockwise in the figure. As a result, the D-cut 40 portion of the shaft 30 for holding the photoreceptor 5 faces the insertion opening 42 . Therefore, the shaft 30 can be removed from the mounting member 29 along the insertion port 42. The photoreceptor 5 taken out from the mounting member 29 is removed from the fixing member 39 and the flange 37 is attached to the shaft 30 as shown in FIG.
By pulling it out, it can be removed from the shaft 30 and replaced with a new one. In this manner, the photoreceptor 5 is replaced, and its installation can be easily performed in reverse order as described above.

Next, the developing device 8 will be explained. This replacement of the developing device 8 is performed when changing the color of the developing toner, etc. The developing device 8 is separated from the photoreceptor 5 by rotating the positioning lever 65 after pulling out the support frame 28 as described above. In this state, the guide member 54 of the developer tank 51 comes off from the guide body 71 on the support frame 28 side. Therefore, the developing device 8 can be taken out upward. If the developing device 8 is positioned as shown in FIG. 10, rotating the manual knob 72 will rotate the developing roller 57 and stirring rollers 58, 59 in the developing tank 51, stirring the developer and rotating the manual knob 72. The agitated developer is supplied to the developing roller 57. In this way, manual rotation of the developing roller 57 and the like is possible at a position away from the photoreceptor 5. This is because the developer generated by the magnetic brush rubs against the same surface of the photoreceptor 5 when the photoreceptor 5 is stopped, so it prevents damage to the photoreceptor surface in that area and prevents excess toner from adhering. .

The developing device 8 is positioned in the developing area facing the photoreceptor 5 by rotating the positioning lever 65 clockwise in the state shown in FIG.
This is done by moving the developing device 8 to the left on the shaft 67. At this time, the developing device 8 is always positioned at a constant distance from the photoreceptor 5 due to the contact between the spacing collar 53 of the developer tank 51 and the photoreceptor 5, and the engagement between the positioning shaft 50 and the positioning portion 55. .

Next, the action of the jamming process in the present invention will be explained. When jamming the paper, open the front door (not shown) of the copying machine main body, hold the knob of the support arm 81, and rotate the support arm 81 counterclockwise from the state shown in FIG. 11. With this rotation, the support body 77 automatically hangs clockwise around the shaft 79, and the conveyor 84 is rotated counterclockwise via the connecting piece 83. As a result, each conveyance path in the paper conveyance system, that is, the conveyance path of the conveyance belt 16 and the conveyance path of the guide plates 85, 850, are simultaneously opened as shown in FIG. Therefore, paper jammed in the conveyance path can be easily removed by opening the conveyance path. In this case, since each conveyance path is opened at once, the operation for opening becomes very simple.

Furthermore, as the support body 77 hangs down, the holding of the guide plates 72 and 73 is released. Therefore, the guide plates 72 and 73 also hang down as shown in FIG. At this time, even if the paper is jammed in close contact with the photoreceptor 5, the guide plates 72, 73 hang down under their own weight, and the paper is peeled off from the photoreceptor 5. Therefore, jam paper can be easily processed without touching the surface of the photoreceptor with hands or the like. Moreover, since the transfer corona discharger 9 attached to the support body 77 is also separated from the paper conveyance path, processing of jammed paper becomes easier.

Here, since the support frame 28 is removable, if the support frame 28 is pulled out during jam processing, the jammed paper may be torn and stagnated in the conveyance path, or the photoreceptor 1 may be damaged.
In order to prevent this, the structure is such that the support frame 28 cannot be pulled out unless the conveyance path is opened. That is, during jam processing, the support arm 81 is rotated before the support frame 28 is pulled out, the conveyance system is opened, and the jam paper is processed.

In addition, in the paper conveyance system, a support arm 81 that holds the support body 77 is connected to a conveyance body 84 of the paper feed system, and the support arm 81 holds the support body 77.
A configuration is adopted in which the transport body 84 is opened from the transport path at the same time. According to this, the entire conveyance path is opened with a single operation, so that the processing of jammed paper and the like is simplified, as described above. Therefore, if the jam paper is processed by opening the transport system, the transport path is restored to the state shown in FIG. 11. This is carried out by rotating the support arm 81 clockwise. At this time, since the support body 77 and the conveyance body 84 are returned at the same time in one operation, there will be no trouble if one forgets to open one of the conveyance paths and starts the copying operation. In other words, the operation for returning to a normal state becomes very easy.

In the present invention, the conveyance path related to the paper conveyance system is opened in connection with a process unit in which a photoreceptor, a developing device, etc. are supported on the same support member, but the present invention is not limited to this. This method can be applied to all devices other than those that separate along a conveyance path. Further, although the synchronous roller 10 is provided on the support frame 28 of the process unit, one of the synchronous rollers 10 may be opened at the same time as the conveyance path is opened.

<Effects> According to the paper conveyance device of the present invention, at least the conveyance path for conveying the paper to the transfer position and the conveyance path for conveying the paper from the transfer position to the next process are opened so that the transfer position is wide open without overlapping. This greatly simplifies the processing of jammed paper.

After jamming, a plurality of conveyance paths can be restored at the same time with a single operation, which simplifies the return operation and prevents forgetting to close the conveyance paths.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the overall structure of an electrophotographic copying machine according to the present invention, FIG. 2 is a perspective view showing a process unit pulled out from the main body of the copying machine, and FIG. 3 is a perspective view showing a recording medium holding structure. 4 is a cross-sectional view showing the structure of the recording medium, FIG. 5 is a side view showing the overall structure of the process unit, FIG. 6 is a side view showing the open state of the recording medium, and FIG. 7 is a developing FIG. 8 is a sectional view showing the internal structure of the developing device, FIG. 9 is a side view of the device showing the drive system of the developing device, and FIG. 10 is a state in which the developing device is installed and removed in the process unit. A side view showing the
FIG. 11 is a side view showing the paper conveyance system in the present invention, FIG. 12 is a side view showing the operating state of the conveyance system in the open position in the present invention, and FIG. 13 is a perspective view showing the external appearance of the box of the cleaning device. 14 are plan views showing the fixing portion of the cleaning device in the process unit. 5: Photoreceptor, 9: Transfer corona discharger, 10:
Synchronous roller, 11: AC corona discharger for peeling, 1
6: Conveyor belt, 17: Fixing roller, 23,2
4, 25, 26: paper feed roller, 77: support body, 7
9: Rotation shaft, 81: Support arm, 83: Connection piece, 84: Transport body, 85, 850: Guide plate, 8
6, 87: Conveyance driven roller; 88, 89: Conveyance drive roller.

Claims (1)

[Scope of Claims] 1. A paper transport device that transports paper from a paper feed section to a transfer position in order to transfer an image formed on a recording medium, and transports the paper after image transfer from the transfer position to the outside of the apparatus. a first conveyance path that conveys the paper from the paper feed section to the transfer position of the recording medium and is provided so that the transfer position side can be opened except for a guide member that guides the paper to the transfer section; a second conveyance path that conveys the paper further downstream from the transfer position and is provided so that the transfer position side can be opened; and a second conveyance path that is provided at the bottom of the second conveyance path that can be opened and closed. a support for holding the support in a switchable manner; and a connecting member having one end rotatably attached to the support and the other end rotatably attached to the first conveyance path, A paper conveyance device characterized in that the first conveyance path is opened without overlapping with the second conveyance path as the second conveyance path opening operation of the paper sheet is performed.