JPH0458626B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention comprises a recording medium having a photoconductive layer,
The present invention relates to a paper transport device that transports paper to the recording medium in an image forming apparatus that 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 ready 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 in 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. If this is the 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, it is not possible to replace only the photoreceptor, and even if other devices can be used, it is necessary to replace the other devices as well, which is extremely uneconomical.

Furthermore, in paper jam removal, even if a unit that integrates a photoreceptor, a developing device, etc. is pulled out, jammed paper cannot be easily 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 a jam, there is a risk that the jammed paper in the conveyance path will be torn, the torn paper will remain in that position, and the copying operation will be started with some of the paper remaining. Therefore, for jam processing, it is desirable to open the conveyance path and remove the paper without pulling out the unit.

Conventionally, in order to open the transport path, there is a copying machine in which the 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, the conveyance path for conveying the paper to the transfer position facing the photoreceptor and the conveyance path for conveying the paper after transfer are open. In this case, if the paper jams while being in close contact with the recording medium, the surface of the recording medium may be soiled or scratched by hands or the like when the paper is removed.

<Objective> The present invention provides a device that can effectively perform paper jam removal in a device that conveys paper to a transfer position of a recording medium.

In particular, the present invention provides an apparatus that makes it easier to remove paper that is in close contact with a recording medium.

<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 as a medium; 5 is a drum-shaped photoreceptor having a photoconductive layer made of arsenic selenium (As ₂ Se ₃ ); 6 is a photoreceptor; 7 is an exposure position of the photoreceptor by the optical system; 8 is a developing device that develops the electrostatic latent image formed on the photoreceptor with colored toner; Reference numeral 9 denotes a transfer corona discharger that transfers the developed toner image on the photoreceptor onto a sheet of paper that is appropriately fed via the synchronous roller 10;
1 is an AC corona discharger for electrostatically peeling the paper from the photoreceptor; 12 is an AC corona discharger for removing charges remaining on the photoreceptor; 13 is a cleaning device for removing toner remaining on the photoreceptor; A static elimination lamp 15 is used to make the surface potential of the photoreceptor uniform before the next image formation, and a non-image area erasing lamp 15 is used to remove 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 air suction means for sucking the back side of the paper, that is, the side opposite 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. The fixing roller 17 is, for example, a thermal fixing roller whose surface facing the toner is heated to a temperature capable of fixing, 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 fed through the fixing roller 17 is discharged to a paper discharge tray 19 via the paper discharge roller 18 .

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 facing 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 rotatably held by a shaft 30, and the shaft 30 is fixed to a photoreceptor mounting member 29. As shown in FIG. This photoconductor mounting member 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.
8 meshes with gear 33. Therefore, the knob 32
Alternatively, the photoreceptor 5 is rotated via the gears 33 and 38 by rotating the shaft 31 with a driving force transmitted from the copying machine main body side. The flange 36 is fixed on the shaft 30, that is, the bearing 34 is fixed at the position shown in the figure, and the flange 37 is provided so as to be movable along the shaft 30. This flange 37
A fixing member 39 for fixing the photoconductor is attached to the shaft 3 correspondingly.
It is screwed to 0. By tightening the fixing member 39 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. As a result, the photoreceptor 5 held between the flanges is removed and can be replaced with a new one.

D-cuts 4 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.
0 is applied. Corresponding to this D-cut 40, on the mounting member 29 side, as shown in FIG. There is.
The attachment and detachment of the shaft 30 holding the photoreceptor 5 to and from the attachment member 29 is shown in FIGS. 5 and 6.
is rotated counterclockwise relative to the support frame 28, the shaft insertion port 42 communicating with the shaft holding hole 41 is directed upward, and the D cut 40 of the shaft 30 is inserted into the insertion port 42.
The shaft 30 can be easily attached or detached by aligning the shaft 30 with the shaft 30 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 done.

A locking member 44 for holding the mounting member 29 in the open position (the state shown in FIG. 6) is removably provided on the mounting member 29 for mounting the photoreceptor 5. As shown in FIG. The locking member 44 is attached to a shaft 45 rotatably provided on the mounting member 29, and is configured to be moved in and out by rotating the shaft 45. At one end of the shaft 45, there is a lever 4 to be rotated.
6 is fixed. A handle 47 fixed to the mounting member 29 is provided corresponding to the lever 46. Therefore, by holding the lever 46 and the handle 47, the shaft 45 can be rotated.
The locking member 44 will be sunk. A locking piece 4 is provided on the support frame 28 side corresponding to this locking member 44.
8 is provided. Therefore, by rotating the mounting member 29 with respect to the support frame 28 as shown in FIG. 6 and rotating the lever 46, the locking member 44 is
It can be locked by the locking piece 48, and the mounting member 2
9 can be held in that position.

In the open 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 manually rotated using the manual knob 32. This allows cleaning the surface of the photoreceptor 5 without removing the photoreceptor itself.
Since the photoreceptor 5 can be cleaned while being held, it can be easily and reliably cleaned without staining the photoreceptor 5 with hand grime or the like. In this case, the photoconductive layer of the photoreceptor 5, such as As ₂ Se ₃ , is coated on the A side with a thickness of about 60 μm, and during one cleaning (polishing)
It is polished by about 0.2 to 0.5 μm.

Further, the attachment member 29 also attaches devices other than the photoreceptor 5. As shown in FIG. 5, the devices attached to this mounting member 29 include a discharger guide member 49 for removably holding the static elimination lamp 14 and the main corona discharger 6 that uniformly charges the photoreceptor 5. 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 mounting member 29.

Next, the developing device 8 that develops the electrostatic latent image formed on the surface of the photoreceptor 5 will be described. As shown in FIG. 7, the developing device 8 has a developing tank 51 and a toner hopper 52 integrally formed with screws or the like.
A spacing collar 53 is rotatably attached to the side of the developer tank 51 to maintain a constant distance from the photoreceptor 5. 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. and,
At the tip of the developer tank 51, a mounting member 2 for the photoreceptor 5 is attached.
A positioning portion 55 is formed corresponding to the positioning shaft 50 provided at the developing device 9, and an engaging portion 56 for moving the developing device 8 along the horizontal direction is integrally formed at the rear end portion. .

Inside the developing device 8, that is, inside the developing tank 51, the eighth
As shown in the figure, the developing roller 57 and the stirring roller 5
8 and 59 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 developing roller 57 transports the developer attracted onto the sleeve 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 59 provided opposite to the developing roller 57 stir the toner supplied from the toner hopper 52 via the toner replenishing roller 60 and send 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. .

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. Therefore, a positioning lever 6 for moving the developing device is provided on the support frame 28 side.
5 is provided. The positioning lever 65 has
Long hole 66 (10th hole) formed in support frame 28
(see figure) is penetrated by a shaft 67,
A gear 68 is fixed to this shaft 67 so as to face the gear 64 provided at a fixed position on the support frame 28 . The positioning lever 65 is rotatably provided around a shaft 69. The shaft 69 is the support frame 28
It is movably provided in a long hole 70 formed in the hole 70, and is always urged downward by an urging means (not shown). Therefore, by rotating the positioning lever 65, the shaft 67 moves along the elongated hole 66 formed in the horizontal direction. 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. 10, the developing device 8 can be mounted on the support frame 28, and the engaging portion 56
is engaged.

Further, in correspondence with the guide member 54 provided on the side surface of the developer tank 51, a guide body 71 is provided on the support frame 28 side so as to sandwich the guide member 54 therebetween. When the developing device 8 is mounted, the guide member 54 is supported by the guide body 71a on the support frame 28 side, and the developing device 8 is supported by the support frame 28. And lever 65
When 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 part 55 comes into contact with the shaft 50. , the positioning of the developing device 8 is completed. At this time, not only is the distance between the developing device 8 and the photoreceptor 5 compensated by the spacing collar 53, but also the shaft 50 and the positioning portion 55 ensure reliable positioning, and the distance between the developing device 8 and the photoreceptor 5 is compensated by the vertical vibration. The spacing will not shift. In this state, the gear 63 etc. mesh with the driving force transmission means on the copying machine main body side,
The developing roller 57 and the like become rotatably driven.

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 that transports paper from this transfer position to other processes will be described in detail.

First, in FIG. 11, paper sent from each paper feed section is sent to the synchronized roller 10 via transport rollers 87 and 89 arranged at a position where the transport paths of the paper feed sections merge. 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 on guide plates 72 and 73. One end of the guide plates 72 and 73 is rotatably supported on the support frame 28 by shafts 74 and 75, and the other end extends to the peripheral surface of the transfer position of the photoreceptor 5, as shown in FIG. has been done.

As shown in FIG. 13, 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. The leaf spring 76 has one end fixed to a support 77 that supports the conveyor belt 16 and the air suction means, as shown in FIG. 13, and its free end holds the guide plate 73. Further, the guide plates 72 are maintained at constant intervals via a spacing member 78 formed integrally with the guide plate 73, and held at the position shown in FIG. 11.

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 that forms 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 16, a transfer corona discharger 9 and an AC corona discharger 11 are detachably attached to the support 77. The transfer corona discharger 9 and the alternating current corona discharger 11 are integrally formed and attached to the support 77 with a margin so as to be able to swing up and down, for example. Then, in order to perform positioning with the photoreceptor 5,
An insulating member for fixing the corona discharge wire is formed to match the shape of a corresponding portion of the support frame 28. Therefore, if the support body 77 is positioned as shown in FIG.
The insulating members of the corona dischargers 9 and 11 come into contact with the corona dischargers 8 and are positioned with respect to the photoreceptor 5.

The support body 77 has an eleventh support arm 81 rotatably supported by a shaft 80 on the main body of the copying machine in order to constitute a paper conveyance path by the conveyance belt 16.
It is maintained in the state shown in the figure. Support arm 81
In this example, a roller 82 is provided in a portion that comes into contact with the support body 77 so as to be freely rotatable. This support arm 81 has
Although not shown, a handle for easily rotating the arm 81 is appropriately attached. 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 on the conveyance belt 16 is moved to the first position.
It is opened as shown in Figure 2.

On the other hand, a conveying body 84 for conveying paper is connected to the support arm 81 via a connecting piece 83. The connecting piece 83 is rotatably attached to the support arm 81 and the carrier 84 at both ends. The conveying body 84 is rotatably provided on the main body of the copying machine about a shaft 840, and also guides the paper fed from each paper feeding section explained in FIG. 1 to the synchronous roller 10. It has one guide plate 85 for conveying the paper, and one driven roller 86, 87 for conveying the paper. Rollers 88 and 89 opposite to rollers 86 and 87 are provided on the copying machine main body side,
This is a drive roller to which driving force is transmitted. roller 8
8 is further provided with a driven roller 90 facing thereto, which sends the paper fed by the paper feed roller 25 to rollers 86 and 88. In addition, the conveyance roller 8
Reference numerals 7 and 89 are located at the convergence of the conveyance paths of sheets sent via paper feed rollers, respectively, and feed the sheets to the synchronous roller 10.

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 due to its own weight clockwise around the shaft 79, and the carrier 84 is rotated counterclockwise via the connecting piece 83. This opens the conveyance path in the conveyance system, making it easier to process jammed paper. In addition, as details are shown in FIG. 13, the support 7
7 hangs down, guide plates 72 and 73 that guide the paper to the transfer position also hang down due to their own weight. This drooping is caused by a stopper 9 provided on the support frame 28.
1. Therefore, the paper that is in close contact with the photoreceptor 5 etc. can be reliably peeled off, and the paper can be processed more easily.

When pulling out the support frame 28,
The support arm 81 is rotated counterclockwise and the twelfth
This is possible only in the state shown in the figure. In this case, the support body 77 is provided with a regulating member 92 that regulates the support frame 28 from being pulled out. This regulating member 92 is fixed to the support body 77 so as to correspond to the support frame 28 in the state shown in FIG. Therefore, in the state shown in FIG. 11, the regulating member 92 of the support body 77 faces the support frame 28 and is in the regulating state, thereby preventing the support frame 28 from being pulled out. However, support arm 8
1, by opening the conveyance system, the regulating member 9
2 is released from the pull-out restricting device of the support frame 28 as shown in FIG. 12, so that the support frame 28 can be pulled out.

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. Therefore, the tips of the guide plates 72 and 73 are connected to the photoreceptor 5.
The transfer position is positioned near the transfer position opposite to the transfer position. The guide plate 72 is positioned by a positioning stopper 93 (see FIG. 13 for details).

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 surface of the photoreceptor 5. This cleaning device 13 is also provided in a detachable manner with respect to the support frame 28. Therefore, as shown in FIG.
It is provided so as to sandwich the box body 94.

As shown in FIG. 14, the box 94 of the cleaning device 13 has a fixing engagement pin 97 fixed to the upper part, and cleaner guides 96a, 96b.
A screw hole 98 is formed to be screwed into.
On the other hand, the cleaner guide 96a has a first
As shown in FIG. 5, an engagement hole 99 is formed corresponding to the engagement pin 97. This hole 99 is formed in an L-shape as shown in the figure. 100 in the figure is
This is a screw hole for fixing screws.

Support frame 28 of the cleaning device 13
To remove it, all screws are removed, the box body 94 is moved to the right with respect to the axis of the photoreceptor 5, and the box body 94 is pulled out toward the front. For mounting, the operation described above can 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,
By rotating the support arm 81 counterclockwise, the support body 77 and the conveyance body 84 are also rotated to open the conveyance system. In the open state of the transport system, the support frame 28 can be pulled out and can be pulled out toward the front door. At this time, the support frame 28 can be pulled out because the support body 77 is already open and the restriction member 92 is not in the restriction position. The state in which the support frame 28 is pulled out is as shown in FIG.

Next, the positioning lever 65 provided on the pulled out support frame 28 is rotated counterclockwise. The developing device 8 is moved to the right in the figure (10th
(state shown in the figure), the photoreceptor 5 is separated from the photoreceptor 5. In this state, by removing the screws or the like fixing between the support frame 28 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. , the locking member 44 is locked to the locking piece 48 as shown in FIG.
It will remain 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 with the mounting member 29 attached. At this time, the photoreceptor 5
is rotated during cleaning, and in order to do this, it is rotated via a manual knob 32, so that the entire surface of the photoreceptor can be easily cleaned. Since cleaning can be performed while holding the photoreceptor 5 in this manner, there is no risk of staining the surface of the photoreceptor with finger 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 by removing the fixing member 39 and attaching the flange 37 to the shaft 3, as shown in FIG.
By pulling it out from 0, it can be removed from the shaft 30,
You can exchange it for a new one. In this manner, the photoreceptor 5 is replaced, and its attachment can be easily carried out by performing the reverse operation 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.
By rotating the developing roller 57 and stirring rollers 58 and 59 in the developing tank 51, the developer is stirred and the agitated developer is transferred to the developing roller 5.
7 will be supplied. In this way, it is possible to manually rotate the developing roller 57 and the like at a position away from the photoreceptor 5. This is the photoreceptor 5
In the stopped state, the developer generated by the magnetic brush rubs against the same surface of the photoreceptor 5, thereby preventing damage to the photoreceptor surface in that area and prevention of adhesion of excess toner.

The developing device 8 is positioned in the developing area facing the photoreceptor 5 in the state shown in FIG.
By rotating the positioning lever 65 clockwise, the developing device 8 is moved to the left by the shaft 67. At this time, the developing device 8
is always positioned at a constant distance from the photoreceptor 5.

Next, the action of the jamming process in the present invention will be explained. When paper is jammed, open the front door (not shown) of the copying machine and move the support arm 81 to the 11th position.
Rotate counterclockwise from the state shown in the figure. With this rotation, the support body 77 hangs down clockwise around the shaft 79 due to its own weight, and the conveyor body 77
is rotated counterclockwise. As a result, each conveyance path in the paper conveyance system is 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.

Further, as the support body 77 hangs down, the holding of the guide plates 72, 73 by the plate springs 76 is released, so that the guide plates 72, 73 hang downward as shown in FIG. At this time, even if a paper jam occurs while the paper is in close contact with the photoreceptor 5, the guide plates 72, 7
3 sagging under its own weight, 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.

Since the support frame 28 can be pulled out, the support frame 28 may be pulled out when the paper jams. If the support frame 28 is pulled out when the paper is jammed, the jammed paper will tear and a portion of the paper will remain in the conveyance path, which may damage the photoreceptor 5 or cause the next paper to become jammed due to the stuck paper. I will do it. Therefore, the structure is such that the support frame 28 cannot be pulled out unless the conveyance path is opened. That is, the regulation member 92 provided on the support body 77 regulates the withdrawal of the support frame 28. Therefore, during jam processing, the jammed paper can be removed by rotating the support arm 81 and opening the conveyance system before pulling out the support frame 28, thereby eliminating the above-mentioned problem.

As described above, by opening the conveyance system and processing the jam paper, the conveyance path is returned to the state shown in FIG. 11. This is performed by rotating the support arm 81 clockwise. At this time, since the support body 77 and the conveyance body 74 are returned at the same time in one operation, there will be no trouble if one forgets to close 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, in connection with the process unit in which the photoreceptor, the developing device, etc. are supported on the same support member, the transport path related to the paper transport system is opened, especially the guide plate 72, etc., but this The present invention is applicable to all types of copying machines other than those in which the main body of a copying machine is separated along a conveyance path. Furthermore, the synchronous roller 10 is also interlocked when the conveyance path is opened.
One of the rollers may be opened.

<Effects> According to the paper conveyance device of the present invention, it is possible to open a plurality of conveyance paths so that the transfer position is wide open without overlapping them, and also rotate the guide member downward with a single operation. Therefore, it becomes very easy to process jam paper, and it is possible to prevent stains and scratches on the recording medium.

[Brief explanation of the drawing]

FIG. 1 is a 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 according to the present invention pulled out from the main body of the copying machine, and FIG. FIG. 4 is a perspective view showing the holding structure, FIG. 4 is a sectional view showing the structure of the recording medium, FIG. 5 is a side view showing the overall structure of the process unit section of the present invention, and FIG. 6 is the open state of the recording medium. 7 is a perspective view showing the external appearance of the developing device, 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 side view of the developing device. 11 is a side view showing the relationship between the process unit and the paper conveyance system in the present invention; FIG. 12 shows the conveyance system in the open state in FIG. 13 is a side view showing details of the guide section to the paper transfer position in FIG. 12, FIG. 14 is a perspective view showing the external appearance of the box of the cleaning device, and FIG. 15 is a cleaning in the process unit. FIG. 3 is a plan view showing a fixing part of the device. 5; Photoreceptor, 8; Developing device, 16; Conveyor belt, 72, 73; Guide plate, 77; Support, 7
6; leaf spring, 81; support arm, 83; connecting piece,
84; Conveyance body; 85; Guide plate; 86, 87; Conveyance roller; 91, 93; Stopper.

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 transport path is provided to transport the paper from the paper feed unit to the transfer position of the recording medium and is openable on the transfer position side, and a first transport path is provided above and below near the transfer unit to guide the paper to the transfer unit. A guide member is provided facing each other and is supported rotatably downward on the transfer position side; a second conveyance path; a support provided at the bottom of the second conveyance path and capable of holding the second conveyance path switchably between a closed position and an open position; one end rotatably attached to the support; , a connecting member whose other end is rotatably attached to the first conveyance path, and when the support body opens the second conveyance path, the first conveyance path is connected to the second conveyance path. A paper conveyance device characterized in that the guide member is opened without overlapping the guide member and rotated downward.