JPS61239269A - Developing device - Google Patents

Abstract

PURPOSE:To agitate a developer and carry it to a developing roll effectively when a developing device is stopped, by providing a recording medium rotatably on a supporting member which is so provided that it can be drawn out of the device body and providing the developing device on the supporting member movably with respect to the recording medium. CONSTITUTION:A photosensitive body is attached rotatably to a supporting frame 28 constituting a process unit, which is provided freely slidably with respect to a copying machine body by a slide member 27, through a photosensitive body attaching member 29. The developing device is provided on the supporting frame 28 movably to a developing position and a separating position. In the separating position of the developing device, a manual driving means which drives a developer agitating means is connected.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an electrophotographic copying machine, and more particularly, to agitation of developer in a device within the copying machine, such as a developing device.

<Prior Art> An electrophotographic copying machine has a recording medium, a so-called photoreceptor, having a photoconductive layer. This photoreceptor is formed, for example, in the shape of a drum, and an image forming device is disposed around the photoreceptor in opposition to the photoreceptor. Therefore, when the photoreceptor is charged and exposed to light, an electrostatic latent image is formed on its surface. 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. Then, replace the photoreceptor or
When cleaning, the photoreceptor is removed from the main body of the copying machine. The photoreceptor is taken out in the axial direction in order to rotate the photoreceptor.

If the photoreceptor is pulled out in this manner, the surface of the photoreceptor is often contaminated with hand marks or the like when replacing the photoreceptor or attaching the photoreceptor after cleaning. 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 with respect to the photoreceptor, and it is extremely troublesome to adjust their positions.

Furthermore, the developing device and the like are configured to be detachable from the main body of the copying machine in order to replace developer, replenish toner, and the like. Therefore, adjusting the mutual positional relationship was troublesome.

The above method involves individually attaching and detaching each device within the main body of the copying machine, 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, a device was developed in Japanese Patent Publication No. 58-5439 to integrate a part of the device facing the photoreceptor and replace it.
This is clearly stated in Publication No. 2. This method involves attaching the photoreceptor, developing device, and cleaning device to the same support member.
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 mounted on the support member in a fixed position, there is no need to adjust the relative positions when mounting them, 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 not economical.

Furthermore, when replacing the developer in the developing device, it seems necessary to replace the entire support supporting the photoreceptor. Even if the developer in the developing device is configured to be replaceable, it is necessary to stir and transport new developer to the developing member at the time of replacement. In this case, since the developing device is fixed to the support member, if it is based on the magnetic brush developing method,
By driving the agitating portion and rotating the developing roller, the developer rubs the same portion of the surface of the photoreceptor while the photoreceptor is stopped, and the toner that has damaged the surface of the photoreceptor is deposited. As a result, the photoreceptor is seriously damaged and a clear image cannot be formed.

<Purpose> The present invention aims to provide a device in which a device facing a photoreceptor, particularly a developing device, is provided on the same support, and the developer is effectively stirred and conveyed to the developing roller when the device is stopped. Particularly, it is an object of the present invention to provide an apparatus in which a developing device is separated from a photoreceptor and agitation of the developer is possible.

<Embodiment> 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 copy 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. Lens 4 for forming an image on the surface of the photoreceptor, which is a medium
The optical system 5 includes a drum-shaped photoreceptor 6 having a photoconductive layer made of arsenic cene (AS2 Se3) or the like.
is the main corona discharger that uniformly charges the photoreceptor to a specific polarity,
7 is the 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, and 9 is paper that is sent as appropriate via the synchronous roller 】O. 1] is an AC corona discharger that electrostatically peels paper from the photoreceptor; 12 is an AC corona discharger that removes residual charges on the photoreceptor; An AC corona discharger, 13 a cleaning device for removing residual toner on the photoreceptor, 14 a static elimination lamp for making the surface potential of the photoreceptor uniform before the next image formation, and 15 a cleaning device for removing residual toner from the photoreceptor after uniform charging. This is a non-image area erasing lamp that removes the electrical charge in the area.

Further, the electrostatic adhesion force of the transfer sheet to the photoreceptor J is weakened by the action of the AC corona discharger 2, and the sheet is peeled off from the photoreceptor 5 due to the stiffness of the sheet itself.

This peeled paper is conveyed by a conveyance bell (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, the opposite side to the side supporting the toner image, onto the surface of the paper. The paper is conveyed to the fixing roller ]7. The fixing roller 7 is, for example, a thermal fixing roller whose surface facing toner is heated to a temperature capable of fixing the toner, and thermally fixes the toner image on the sheet being conveyed. A paper discharge roller 8 is provided at the paper output portion of the fixing roller 7, and the paper fed through the fixing roller 17 is discharged to a paper discharge tray 19 via a paper discharge roller 18.

The above paper is stored in the paper feed cassette 2, which is attached to and detached from the copier main body.
0, paper feed rollers 23, 24 .
It is fed to the synchronized roller 10 by the selection drive of 25 and 26. This synchronous roller] The paper that is fed to
In synchronization with the rotation of the photoreceptor 5, the synchronous roller 0 is driven to send it to the transfer position. 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 by a slide member 27 via a photoreceptor mounting member 29 to a support frame 28 that constitutes a prosenu unit that is slidably provided on the main body of the copying machine. There is. In addition to the photoreceptor 5, the support frame 28 includes:
Some devices are provided to face the photoreceptor and form an image. That is, the devices disposed on the support frame 28 include the main corona discharger 6, the developing device 8, the cleaning device 13, the static eliminating lamp 14, and the non-image area erasing lamp 15. Here, by providing the AC corona discharger 12 for charge removal, the AC corona discharger 12 for stripping, and the charge removal lamp 14, there is no problem in image formation even if they are not provided.

The photoreceptor 5 is rotatably held by a shaft 30 shown in FIG. 3, and the shaft 30 is fixed to a photoreceptor mounting member 29. As shown in FIG. The photoreceptor mounting member 29 is rotatably supported by the support frame 28 via a shaft 31. As shown in FIG. One end of the shaft 31 passes through the support frame 28, and a knob 32 for rotating the photoreceptor is attached to this protrusion.The other end of the shaft 31 passes through the support frame and is attached to the main body of the copying machine. A transmission member (not shown) is attached that couples with the provided driving force transmission member. Further, a gear 33 for rotating the photoreceptor 5 is fixed to the shaft 31.

Further, as shown in the cross-sectional view of FIG.
held between. 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, when the shaft 3 is rotated by the driving force transmitted from the knob 32 or the copying machine main body side, the photoreceptor 5 is rotated via the gears 33 and 38. The flange 36 is fixed on the shaft 30, the shank 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.The fixing member 39 is
When tightened in the left direction, the photoreceptor 5 is firmly fixed between the flanges. When the fixing member 39 is removed from the shaft 30, the flange 37 can be removed from the shaft 30, and the photoreceptor 5 held between the flanges can be removed and replaced with a new one.

A D cut 40 for attaching the photoreceptor 5 to the mounting member 29 is provided at both ends of the rotation center shaft 30 of the photoreceptor 50 . Corresponding to this D cut 40, the fifth
A shaft insertion opening 42 communicating with a hole 41 holding the through shaft 30 shown in the figure is formed to match the shape of the D cut 40. To attach and detach the shaft 30 holding the photoreceptor 1 to and from the mounting member 29, as shown in FIGS. With the communicating sliding shaft insertion port 42 facing upward, insert the shaft 3
The D-cut 40 of 0 is aligned with the insertion opening 42, and the shaft 30 can be easily attached or detached by pulling it out or inserting it. At this time, if the shaft 30 is rotated counterclockwise, the D cutter 40 will be removed from the insertion opening 42 as shown in FIG.
1 to prevent it 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.
It is screwed at 30, and the photoreceptor 5 is held in that position.

The attachment member 29 for attaching the photoreceptor 5 is provided with a locking member 44 that can be freely extended and retracted to hold the attachment member 29 in the open position (the state shown in FIG. 6). The locking member 44 is attached to a shaft 45 rotatably provided on the mounting member 29, and is retracted and retracted by rotating the shaft 45. A lever 46 for rotation is fixed to one end of the shaft 45. A member 47 fixed to the mounting member 29 is provided corresponding to the lever 46.

Therefore, if the lever 46 and the member 47 are clamped, the shaft 45 can be rotated and the locking member 44 will be depressed. Support frame 28 corresponds to this locking member 44.
A locking piece 48 is provided on the side. Therefore, the mounting member 2
9 as shown in FIG. 6, and the lever 46 is fully rotated, the locking member 44 can be locked with the locking piece 48, and 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;
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 knob 32. As a result, when cleaning the surface of the photoreceptor 5, the photoreceptor 5 can be cleaned without removing the photoreceptor itself, and can be cleaned while it is being held, so the photoreceptor 5 can be easily and reliably cleaned without staining the photoreceptor 5 with hand marks or the like. can. In this case, the photoconductive layer of the photoreceptor 5, such as As2 Se3, is coated on the A1 surface with a thickness of about 60 μm, and is coated with a thickness of about 60 μm during one cleaning (polishing). Polished to about 5 μm.

Furthermore, devices other than the photoreceptor 5 are also attached to the attachment member 29. As shown in FIG. 5, the devices attached to this mounting member 29 include a static elimination lamp 34, a discharger guide member 49 for detachably holding the main corona discharger 6 for uniformly charging the photoreceptor 5, and , non-image area erase lamp]5. A positioning shaft 50 for ensuring the positional relationship between the developing image device 8 and the photoreceptor is attached to the attachment 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 developer tank 51 and a toner hopper 52 integrally formed using screws or the like, and a constant distance between the developer tank 51 and the photoreceptor 5 on the side. A spacing collar 53 is rotatably mounted to maintain the distance. Further, on the side of the developer tank 51,
A guide member 54 for horizontally moving the developing device 8 itself is integrally formed. And the developer tank 51
A positioning portion 55 is formed at the front end of the photoreceptor 5 in correspondence with a positioning shaft 50 provided on the mounting member 29 of the photoreceptor 5, and a positioning portion 55 is formed at the rear end for moving the developing device 8 along the horizontal direction. A retaining portion 56 is integrally formed therein.

Inside the developing device 8, that is, inside the developing tank 5J, as shown in the sectional view of FIG. 8, 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 conveys, for example, the adhered developer to a developing area facing the photoreceptor l. As a result, the electrostatic latent image formed on the photoreceptor is developed. Stirring rollers 58 and 59 provided opposite the developing roller 57 stir the toner supplied from the toner hopper 52 via the toner replenishing roller 60 and send the stirred developer to the developing roller 57. be.

As shown in the side view of FIG. 9, the developing roller 57 and stirring rollers 58 and 59 are gears 6 fixed to one end of each rotating shaft.
, 62.63 are in mesh. A gear 63 connected to the stirring roller 59 is connected to a gear 64 rotatably provided at a fixed position on the support frame 28 (see FIG. 10) 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 removed upwardly when the supporting frame 28 is pulled out and the 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.

A shaft 67 provided in a long hole 66 (see FIG. 10) formed in the support frame 28 passes through the positioning lever 65, and the shaft 67 is rotatably inserted into the position of the support frame 28. In correspondence with the provided gear 64, the gear 6
8 is fixed. 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 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 retaining portion 56 of the developing device 8, and is engaged with the retaining 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 as shown in FIG. 10 and the shaft 67 is located in the state shown in FIG. 10B,
The shaft 6 allows the developing device 8 to be attached to the support frame 28.
7, the locking portion 56 is locked. Furthermore, in correspondence with the guide member 54 provided on the side surface of the developer tank 5, a guide body 71 is provided on the support frame 28 side, and is shaped to sandwich the guide member 54 therebetween. When the developing device 8 is installed, the guide member 54 is supported by the guide body 7]a on the support frame side. Then, 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 55 is moved toward the shaft 50. The developing device 80
Positioning is completed. At this time, the developing device 8 is not only deeply immersed with respect to the photoreceptor 5 by the spacing collar 53, but also can be reliably positioned by the shaft 50 and the positioning portion 55.
The distance between the photoreceptor 5 and the photoconductor 5 does not shift due to vibrations such as vertical vibrations. 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 is configured to move the positioning lever 65 as shown in FIG. 10B.
By rotating it to the position shown in , it becomes possible to separate from the photoreceptor 5 and from the support frame 28 . In this position, as described above, the gear 68 of the shaft 67 meshes with the gear 64 on the support frame 28 side, and this gear 64 and the developing device 8
meshes with the gear 63. This state is the same as shown in FIG. Therefore, by rotating the shaft 67, the developer tank 5
] The developing roller 57 and agitating rollers 58 and 59 in the developer are rotated to agitate the developer. In order to perform this rotation, a manual stirring knob 72 is fixed to one end of the shaft 67.

Next, a conveying system for conveying the paper to the transfer position of the photoreceptor 5 will be described with reference to FIGS. 5 and 11. The paper is transferred in synchronization with the rotation of the photoreceptor 5.

0 is the support frame 2
The paper is fed through a transport path formed by a tray provided at 8 and guide plates 72 and 73.

One end of the guide plates 72 and 73 is a support frame.

It is rotatably supported on the shaft 74 and 75 by the arm 28,
The other end extends to the transfer position side of the photoreceptor 1. 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, and its free end holds the guide plate 73. Further, the guide plate 72 is maintained at a constant distance from the guide 73 by a spacing member 78, and is held at the position shown in the figure.

The support body 77 is rotatably supported by the copying machine main body around a shaft 79. In addition to the conveyor belt 6, a transfer corona discharger 9 and an AC corona discharger 1 are removably attached to the support 77. The transfer corona discharger 9 and the alternating current corona discharger 11 are mounted with a sufficient margin so that the support 77 can swing up and down, for example, and a corona discharge wire is attached in order to position the transfer corona discharger 9 and the AC corona discharger 11 with respect to the photoreceptor 5. The insulating member to be fixed is formed to match the shape of the support frame 28. Thus, with support 77 positioned as shown, each corona discharger 9. ]] comes into contact with the insulating member, and positioning with the photoreceptor I is performed. Such a support body 77 is held in the state shown in the figure by a support arm 8 which is rotatably supported by a shaft 80 on the main body of the copying machine.

The support arm 8 is provided with a freely rotatable corona 82 at the portion that comes into contact with the support body 77. Although not shown in the drawings, this support arm 81 is appropriately attached with a heir for rotating the arm 81. Further, a conveying body 84 for conveying paper is connected to the support arm 8 via a connecting piece 83. 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 in the main body of the copying machine on a shaft 840, and is used to guide the paper fed from each paper feed section explained in FIG. 1 to the synchronous roller 10. One guide plate 85 of
and one driven roller 86, 8 for conveying the paper.
7. Roller 8 facing roller 86°87
Reference numeral 8.89 is a drive roller provided on the copying machine main body side and to which driving force is transmitted. A driven roller 90 is further provided opposite to the roller 88, and a driven roller 90 is provided to face the paper feed roller 2.
The paper sent at step 5 is sent to rollers 86 and 88.

Further, the conveyance rollers 87 and 89 are located at the confluence of the conveyance paths of the paper sent via the respective paper feed rollers, and feed the paper to the synchronous roller 0.

In the above-described configuration, the support arm 8 is rotated counterclockwise in the figure when clearing paper jams or pulling out the support frame 28. At this time, as shown in FIG. 12, the support body 77 hangs down by 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 dispose of jammed paper. Further, as the support body 77 hangs down, the guide plates 72 and 73 that guide the paper to the transfer position also hang down due to their own weight.

This drooping is prevented by a stopper 9 provided on the support frame 28.
1. Therefore, the paper that is in close contact with the photoreceptor etc. can be reliably peeled off, and the paper can be easily processed.

When the support frame 28 is pulled out, the support arm 81 is
This is possible only in the state shown in Figure 2.

This is because a regulating member 92 is provided on the support body 77, and this regulating member 92 makes it impossible to pull out the support frame 28. However, by releasing the transport system using the support arm 81, the regulating member 92 is released from the regulating position (first
2), 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 plate 72 is moved by the leaf spring 76.
73 is pushed up, and its tip is positioned near the transfer position facing the photoreceptor 5. The guide plate 72 is positioned by a positioning stopper 93.

Next, a cleaning device j3 that cleans toner remaining on the photoreceptor 5 will be explained.

The cleaning device 13 includes a cleaning blade 95 inside a box 94, and removes residual toner by bringing the tip of the cleaning grade 95 into pressure contact with the photoreceptor 5. This cleaning device 13 is also provided detachably from the support frame 28. For this purpose, the support frame 28 is provided with a cleaner guide 9 as shown in FIG.
6a and 96b are provided to sandwich the box 94 of the cleaning device 13. [Cleaning device] As shown in FIG. 13, the box 94 of No. 3 has a retaining pin 97 fixed to the top thereof, and a cleaner guide 96a.
, 96b are formed with screw holes 98 for screwing. On the other hand, a retaining hole 99 is formed in the cleaner guide 96a in correspondence with the retaining pin 97, as shown in FIG. This hole 99 is formed in an L-shape as shown in the figure. , 100 in the figure is a screw hole for screwing.

The cleaning device 13 can be removed from the support frame 28 by removing all the screws, moving the box 94 to the right with respect to the axis of the photoreceptor 1, and pulling 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, the front door (not shown) of the copying machine body is opened, the support arm 81 is rotated counterclockwise, and the support body 77 and 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. The 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 (shape B in FIG. 10B) and is separated from the photoreceptor 5 by a large distance. In this state, by removing the screws or the like fixing between the support frame 28 and the mounting member 29 of the photoreceptor 1, the mounting member 29 can be rotated around the shaft 31, for example in a counterclockwise direction. As shown in FIG. 6, the locking member 44 is locked with the locking piece 48 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.

Furthermore, when replacing the photoreceptor 5, turn the screw 430t-removal lever 43 clockwise in the figure in the state shown in FIG. Accordingly, the D-cut 40 portion of the shaft 30 for holding the photoreceptor 5 faces the insertion opening 42. Therefore, the axis 30
can be removed from the mounting member 29 along the insertion opening 42. The photoreceptor 5 taken out from the mounting member 29 is attached to the fourth
As shown in the figure, remove the fixing member 39 and attach the flange 37 to the shaft 3.
By pulling it out from zero, 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 by reversing the above-described replacement operation.

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.

After the support frame 28 is pulled out as described above, the developing device 8 is moved from the photoreceptor 5 to the photoreceptor 5 by fully rotating the positioning lever 65, which is in the state shown in Figure A in Figure A.
They are spaced apart as shown in the figure. In this state, the developer tank 51
The guide member 54 is the guide body 71 on the support frame 28 side.
It comes off. Therefore, the developing device 8 can be taken out upward.

In the developing device 8, it is necessary to replace the developer in the developing tank 51 according to the number of copies. In this exchange,
From the state shown in FIG. 10A, the positioning lever 65 is rotated counterclockwise to move the developing device 8 rightward to the position shown in FIG. 10B. In this state, the bottom of the developer tank 5] is removed and the developer in the developer tank 5] is discharged. The support frame 28 is open at a portion corresponding to the bottom of the developer tank 51 in FIG. 10B. A developer container or the like is attached to the open portion of the support frame 28, and the developer is collected in this container or the like. Once the developer has been removed, the developer can be replaced by removing the bottom of the developer tank 5, opening the lid or the like at the top of the developer tank 51, and putting in new developer. As mentioned above, instead of replacing the developer, the developer in the developer tank 5 may be replaced by removing the developing device 8 from the support frame 28 of the process unit. When finished, the developing device 8
It is positioned as shown in Figure 0B.

In this state, the gear 68 of the shaft 67 meshes with the gear 63 fixed to the shaft of the stirring roller 59 via the gear 64 provided on the support frame 28 . Therefore, the axis 67
When the manual knob 72 is rotated, the developing roller 57 and stirring rollers 58 and 59 are rotated. As a result, the replaced developer is stirred and conveyed to the developing roller 57, and the agitated developer is uniformly adsorbed by the developing roller 57. This manual stirring of the developer is carried out with the developing device 8 shown in FIG. The surface of the photoreceptor is not rubbed. Therefore, damage to the photoreceptor 5 can be prevented.

Also, regarding replenishment of toner to the toner hopper 52,
It is preferable to replenish the developing device 8 while it is in the state shown in JO diagram B. This is because the developing device 8 and the like vibrate when toner is replenished, which may cause the developer produced by the magnetic brush to damage the surface of the photoreceptor. In order to prevent this, Figure 10B
You can replenish toner in this state. However, the present invention is not limited to this, and toner replenishment may be performed in the state shown in FIG. 10A as long as vibration of the developing device 8 is prevented.

To position the developing device 8 to the developing area facing the photoreceptor 5, use the positioning lever 6 in the state shown in FIG. 10B.
Rotate 5 clockwise. Accordingly, at the shaft 67,
The developing device 8 is moved leftward and positioned. At this time, the spacing collar 5 of the through development tank 51 shown in FIG.
3 and the photoreceptor 5 and engagement between the positioning shaft 50 and the positioning portion 55, the developing device 8 is always positioned at a constant distance from the photoreceptor 5.

Next, the action of jam processing will be explained.

When this jam occurs, the conveyance system opens as explained earlier (12th
(see figure). This allows paper jammed in the conveyance path to be easily removed.

Here, even if a paper jam occurs while the paper is in close contact with the photoreceptor 5, the guide plates 72 and 73 are suspended by their own weight, so that the paper is peeled off from the photoreceptor 5 and the jam can be easily cleared.

Here, since the support frame 28 can be pulled out, if the support frame 28 is pulled out during jam removal,
The jammed paper may be torn and stagnated in the conveyance path, potentially damaging the photoreceptor 2. 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, when clearing a jam, the support arm 8 is removed before the support frame 28 is pulled out.
1 is rotated to open the conveyance system, and the jammed paper is processed.

Further, in the paper conveyance system, a support arm 81 that holds the support body 77 is connected to a conveyance body 84 connected to the paper feed system, and the support arm 81 simultaneously opens the support body 77 and the conveyance body 84 from the conveyance path. It has a configuration that allows According to this, the entire transport path can be opened with a single operation, making it easier to dispose of jammed paper and the like. In addition, the support body 7
7 and the conveyor 84 are opened and closed at the same time, so there is no possibility that the copying operation will start with either one open.

<Effects> According to the developing device of the present invention, the recording medium is rotatably attached to the support member provided so as to be able to be pulled out in the axial direction from the main body of the device, and the developing device is placed at a position separated from the developing position with respect to the recording medium. Since it is movably provided on the supporting member and connected to a manual drive means for driving the developer stirring means at a remote position of the developing device, the developer is stirred and sent to the developing section when replacing the developer. There is no risk of damaging the recording medium even when the recording medium is driven, and the developer can be agitated and conveyed effectively.

[Brief explanation of the drawing]

FIG. 1 is a cross section showing the overall structure of an electrophotographic copying machine according to the present invention, FIG. 2 is a perspective view showing the copying machine main body with the process unit of the invention pulled out, and FIG. 3 is a diagram showing the present invention. 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 of the present invention, and FIG. 6 is the opening of the recording medium. 7 is a perspective view showing the 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. 1
0A is a side view showing the developing position of the developing device of the present invention in the process unit, FIG. 10B is a side view showing the separated position of the developing device of the present invention in the process unit, and FIG. 11 is the process of the present invention. FIG. 12 is a side view showing the relationship between the unit and the paper conveyance system, FIG. 12 is a side view showing the operating state of the conveyance system in the open position in FIG. 1J, and FIG. 13 is a perspective view showing the external appearance of the cleaning device box. , FIG. 14 is a plan view showing a fixed part of the cleaning device in the process unit. 1: Photoreceptor 6: Main corona discharger 8: Developing device
13: Cleaning device 27: Slide 30: Photoconductor rotation shaft 3J: Mounting member 5: Developing tank 54 Guide member 57: Developing roller 58.59: Stirring roller 61. 62, 63: Gear 64: Gear 65: For positioning Lever 67: Axis 68: Gear 72: Manual knob Agent Patent attorney Aihiko Fukushi (and 2 others) No. 41!
1 1! 4 Figure 6 Figure θ flash JF9 Figure I Figure 10 B

Claims (1)

[Claims] 1. In a developing device that is provided facing a recording medium and develops an electrostatic latent image, the recording medium is rotatably held on a support member that is provided to be pulled out in an axial direction that rotates the recording medium, and , means for movably disposing a developing device on the supporting member between a developing position facing the recording medium and a position separated from the recording medium, and manually driving a means for stirring the developer at the remote position of the developing device; A developing device characterized in that it is configured to be connected to.