JPH05173407A - Developing machine control method, developing machine control device, and electrophotographic apparatus - Google Patents

Abstract

(57) [Summary] [Object] To provide a method that does not pollute the surroundings, and a developing device capable of accurately performing the method. [Structure] When the development of the first developing machine 13 is completed, the flow of the developer 2 is first suppressed by the regulating member 7, so that the carrier of the developer 2 is prevented from scattering even when the developing roll 5 is rotating at a high speed. It is possible to reduce the amount of scattering even if it is scattered. Moreover,
After the restraint by the regulating member 7, the shutter 9 closes as the case 1 moves, so that carrier scattering can be reliably prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a developing machine control method and a developing machine control device for developing an electrostatic latent image formed on a photosensitive drum as a non-developing body, and an electrophotographic apparatus equipped with the developing machine device. The present invention relates to a device, and more particularly to a device suitable for preventing deterioration of image quality.

[0002]

2. Description of the Related Art In recent years, the demand for color printing has increased, and higher quality printing has been required. Various types of electrophotographic devices capable of multicolor printing have been proposed and put into practical use, but as a typical example thereof, a plurality of developing machines having developers of different colors are provided. In addition, there is one in which multicolor printing is performed by using a developer composed of a two-component developer for each developing machine. In that case, the development is performed by one selected developing machine, and the other developing machines need to be retracted from the photoconductor in order to avoid color mixing with the selected developing machine. In such a retracting developing machine, when the developer adhering to the surface of the developing roll separates from the photoconductor at the time of retreating, the magnetic carrier in the two-component developer is generated by the action of the magnet built in the developing roll. Occurs when the particles are scattered from the developing roll. The amount of scattering at this time reaches several hundred times or more of the normal amount attached to the photoconductor during development, which is a cause of contamination in the apparatus. Further, since the magnetic carrier is scattered and adheres to a developing portion of the photoconductor, when the photoconductor is used to transfer the recording paper to the recording paper, an image may be missing and the image quality may be deteriorated.

In order to solve the above-mentioned problems, as prior arts, JP-A-62-280877 (hereinafter referred to as the first prior art) and JP-A-61-250665 (hereinafter referred to as the prior art).
The second prior art).
That is, in the first conventional technique, the developing machine is provided with a shutter capable of opening and closing the exposed surface of the developing roll so that the developing machine retracts and moves in conjunction with the retracting movement during non-developing. In addition, the shutter gradually blocks the exposed surface of the developing roll, thereby preventing the magnetic carrier from scattering on the surface of the photoconductor. In the second prior art, when the developing machine is not developing, the driving of the developing roll is stopped, a bias voltage is applied to the developing roll, and a part of the developer on the surface of the developing roll is removed. The same effect as the first conventional technique is obtained.

[0004]

By the way, the electrophotographic apparatus is required to print at a higher speed, and it is necessary to rotate the developing roll at a high speed in order to cope with the demand. However, the first prior art is configured so that the shutter is gradually closed in conjunction with the retracting movement of the developing machine when the developing machine is not developing. When the rotation speed is increased, there is a problem that the carrier is scattered from the developing roll to the surface of the photoconductor before the shutter is completely closed and the inside of the apparatus is contaminated. In particular, the amount of carrier scattering rapidly increases as the developing roll rotates at high speed. In the second prior art, since the driving of the developing roll is stopped when the developing machine is not developing,
When developing with the developing machine, the developing roll is driven again to convey the developer, so it takes time for the developer to stabilize, and when the conveyance is unstable, the image density However, as a result of an excessive amount of toner adhering to the photoconductor, a fogging phenomenon occurs and good development cannot be performed.

An object of the present invention is to provide a control method of a developing machine which does not pollute the surroundings in view of the above problems of the prior art, and another object of the present invention is to appropriately implement the above method. It is another object of the present invention to provide a developing machine control device, and yet another object of the present invention is to provide an electrophotographic device that can achieve high quality and high speed printing.

[0006]

In the control method of the present invention, the amount of the developer flowing to the developing roll is suppressed when the developing machine finishes the development. The developing machine control device of the present invention has a developing machine and control means for controlling the developing machine. The developing machine includes a developer, a developing roll partially exposed to the non-developer side and capable of developing the non-developer, a regulating member movably attached to the developing roll, and an exposed part of the developing roll. And a shielding member capable of covering the developing action position, and moves from the developing non-acting position to the developing action position during development, and retracts from the developing action position to the developing non action position during non-development. The control unit moves the regulating member toward the developing roll and suppresses the amount of the developer conveyed to the developing roll when the developing machine finishes the development. The electrophotographic apparatus of the present invention comprises a non-developing member, a charger, an exposing means, a developing machine control device having the developing machine and control means.

[0007]

In the control method of the present invention, as described above, when the developing machine finishes the development, the flow of the developer to the developing roll is first suppressed, so that the carrier of the developer is scattered even when the developing roll is rotating at a high speed. It is possible to prevent this, and even if it scatters, the amount of scattering can be greatly suppressed. As a result, it does not pollute the surroundings. In the developing machine control device of the present invention, the regulating member of the developing machine is movably attached to the developing roll, and when the developing machine finishes the development, the regulating member is moved by the control means to develop the developing roll of the developer. Since it is configured so as to suppress the flow of the developing roll, it is possible to sufficiently cope with the high speed rotation of the developing roll, and the above method can be properly implemented. Since the electrophotographic apparatus of the present invention has the above-mentioned developing machine control apparatus, it can sufficiently cope with the high speed rotation of the developing roll, and can achieve high quality and high speed printing.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 9 show an embodiment of an electrophotographic apparatus to which a developing machine controller for carrying out the method of the present invention is applied. This electrophotographic apparatus enables two-color printing of, for example, black and another color different from that, and
As shown in, the photosensitive drum 10 as a non-developing member is rotatably supported. Around the photosensitive drum 10, a charging device 11, an exposing device 12, a second developing device 14, a first developing device 13, a transfer device 15, a cleaner 18, and an eraser lamp 19 are arranged. Here, the first developing machine 14
Is for forming a black toner image, for example, by performing contact development on the photosensitive drum 10.
It is configured so that it can move between the developing action position and the developing non-action position apart from that position. Second developing machine 1
Numeral 4 is for fixing the toner image of another color different from the black toner image by non-contact development on the photosensitive drum 10. And in FIG.
When the photosensitive drum 10 rotates clockwise,
The surface of the photosensitive drum 10 is uniformly charged by the charger 11, and the charged photosensitive drum 10 is irradiated with light (for example, a laser beam) that is modulated by the exposure means 12 to image information to be recorded. An electrostatic latent image is formed on 10. As the rotation of the photosensitive drum 10 progresses, the electrostatic latent image portion of the photosensitive drum 10 is developed by the first developing device 13, and a black toner image of the first color is formed on the photosensitive drum 10. At this time, the first developing machine 13 remains in the developing action position.

After the black toner image is formed as described above, the rotation of the photosensitive drum 10 further progresses, the charge on the surface of the photosensitive drum is adjusted by the eraser lamp 19, and then the surface of the photosensitive drum 10 is charged again. 11 is charged for the second color, and then an electrostatic latent image is formed by the irradiation of the exposure unit 12, and thereafter, non-contact development is performed by the second developing device 14 to form a black toner image on the surface of the photosensitive drum 10. A different color toner image is formed. After a black toner image and a toner image of another color are formed on the photosensitive drum 10, the toner image is transferred to the recording paper 16 by the transfer device 15. The outline of each of these steps is shown in order in FIG. After that, the toner image transferred onto the recording paper 16 is thermally fixed by the fixing device 17, and the fixed recording paper 16 is sent to a tray (not shown). The recording paper 16 is conveyed from left to right in FIG. 7 by a conveyor 20 such as a belt. On the other hand, the photosensitive drum 1
After 0 is transferred to the recording paper 16, the toner remaining on the surface is removed by the cleaner 18, and the charge on the drum surface is removed by the eraser lamp 19,
Prepare for the next development. As shown in FIGS. 1 and 2, the first developing machine 13 includes a developer 1, a stirring member 3, and a case 1 in a case 1.
The developing roll 5 and the regulating member 7 having the magnetic field generator 4 therein
It is equipped with The developer 2 constitutes, for example, a two-component developer composed of toner and a magnetic powder carrier, and when the toner runs short due to repeated development, the toner is replenished from the toner hopper 1a into the case of the developing machine by the rotation of the replenishment roller 1b. I am trying to do it. The stirring member 3 is composed of two rollers in this example, and the developer 2 is fed to the developing roller 5 by rotating each of them about an axis. The developing roll 5 is internally provided with the magnetic field generator 4
And is disposed coaxially with the magnetic field generation unit 4 and is rotatably supported along the outer circumference of the magnetic field generation unit 4, and a part of 5 is exposed from an opening provided in the case 1. It is arranged so as to be exposed on the drum 10 side. This developing roll 5 is normally rotating, and during development, the developer 2
When a desired amount of toner is fed, the developer 2 is attached to the surroundings by the magnetic action of the magnetic field generator 4 and the magnetic carrier in the developer, and at the portion exposed to the outside of the developing roll 5, the toner of the developer 2 is removed. By forming the spikes 6 having a certain height so as to come into contact with the photosensitive drum 10,
The electrostatic latent image on the photosensitive drum 10 can be developed into a black toner image. The regulating member 7 is the developing roll 5.
The amount of the developer 2 flowing upward is regulated as a desired amount required for development, and the gap between the developer 2 and the photosensitive drum 10 is about 1 mm during development. The second developing machine 14 performs non-contact development, but since it is basically the same as the first developing machine 13, its explanation is omitted here.

Therefore, the first developing machine 13 moves between the developing action position and the developing action position by rotating around the fulcrum. Specifically, as shown in FIG. 6, the first developing machine 13 uses the case 1 as the fulcrum shaft 8
The case 1 is mounted on a support base 81 while being axially supported by. The support base 81 has a semicircular protrusion 82 formed thereon.
Is provided so as to support the bottom portion of the developing case 1 together with the protrusion 82, and is connected to the case drive portion 83 as shown in FIG. The case drive unit 83 has a drive source such as a cylinder or a motor via a rack and a pinion, and is controlled by the controller 100.
Then, when the first developing machine 13 is not developing, in FIG. 3, the case drive unit 83 is driven by a command from the controller 100, and the support base 81 is moved to the left side, the case 1 rotates counterclockwise about the fulcrum shaft 8. 2 moves to the developing action position as shown in FIG. 2, and when the support base 81 moves to the right side, the case 1 rotates clockwise about the fulcrum shaft 8 as shown in FIG. The retreat movement is made to the non-development position. Further, the first developing machine 13 is provided with a shutter 9 as a shielding member for covering the exposed portion of the developing roll 5 when not developing. The shutter 9 is, as shown in FIGS.
Is attached to a rotary shaft 91 arranged coaxially with a shaft (not shown) for supporting the developing roller 5. When the developing shaft 5 is not developed, the rotary shaft 91 is driven by a shutter driving section 92, so that the developing roll 5 is exposed. The rotating shaft 91 covers the part and during development.
Is driven in the reverse direction so that the cover of the developing roll 5 is released. Therefore, the first developing machine 13 covers the developing roll 5 with the shutter 9 during non-developing, and releases the developing roll 5 by returning the shutter 9 to the original position during developing. The shutter drive unit 9
2 is controlled by the controller 100.

Further, the first developing machine 13 moves the regulating member 7 toward the developing roll 5 during non-developing,
The amount of the developer 2 sent to the developing roll 5 is suppressed so as to be less than the amount required for development. Therefore, the regulating member 7 is attached so as to be movable toward the developing roll 5. That is, as shown in FIG. 4, the regulating member 7 has one end attached to the other end of the compression spring 71 fixed to the inner wall of the case 1, and is arranged such that the tip end faces the developing roller 5. A magnetic body 72 is embedded in the regulation member 7, while an electromagnet 73 is installed at a position facing the regulation member 7 of the developer case. During development, when the electromagnet 73 is excited by the regulation member drive unit 75 as shown in FIG. 3, the magnetic body 72 of the regulation member 7 is attracted by the electromagnet 73, so that the tip of the regulation member 7 is developed. 5
And the developer 2 is prevented from flowing to the developing roll 5. At this time, the movement amount of the regulating member 7 is set so that the tip of the regulating member 7 does not contact the developing roll 5 and the amount of the developer 2 flowing through the regulating member 7 is much smaller than that at the time of development. . The regulating member drive unit 75 is controlled by the controller 100, like the support first drive 83 and the shutter drive unit 92. Further, the regulating member 7 has an adjusting knob 74 for finely adjusting the distance to the developing roll 5. The fine adjustment knob 74 penetrates the case 1 and its tip is in contact with the regulating member 7 in the case 1. By rotating the fine regulating knob 74, the position of the regulating member 7 with respect to the developing roller 5 can be finely adjusted. ing. Therefore, the fine adjustment knob 74 is kept secret from the case 1 so that the developer 2 does not leak to the outside. Then, the controller 100
Controls at least the first developing machine 13 and the second developing machine 14 according to a desired program, and constitutes a developing machine control device together with the first and second developing machines 13 and 14. That is, the controller 100 controls the first developing machine 13 when the first developing machine 13 is in the non-developing state.
When the development of the black toner image is completed by, the regulating member 7 is first moved toward the developing roll 5 via the regulating member driving unit 75, and the developer 2 flowing to the developing roll 5 as shown in FIG.
I try to suppress the amount of. After being restrained by the restricting member 7, the controller 100 drives the support base 81 via the case drive unit 83 to retract the developing machine to the non-development working position. During the retracting movement, the developing roll 5 of the developing machine is moved. When the space between the photosensitive drum 10 and the photosensitive drum 10 becomes a distance sufficient to close the shutter 9, or when the developing machine has finished retreating to the non-development working position, the shutter is driven via the shutter drive unit 92. 9 is driven, and the developing roller 5 is covered by the shutter 9. Therefore, the closing operation of the shutter 9 is preferably determined by the rotation angle of the developing device that is retracted, and the angle is preset. Further, when the controller 100 moves the retracted developing machine to the developing action position, first, the developer 2 in the case 1 is developed by returning the regulating member 7 to the original position via the regulating member driving portion 75. The developing roller 5 is caused to flow as much as necessary, and then the shutter 9 is opened via the shutter driving section 92,
The support base 81 is driven via the case drive unit 83, and the case 1
Is moved from the non-developing position to the developing position.

Next, one embodiment of the method of the present invention will be described with reference to the operation of the electrophotographic apparatus of the embodiment. That is, when the photosensitive drum 10 rotates in the direction of the arrow as shown in FIG. 8, the surface of the photosensitive drum 10 is charged for the first color by the charger 11 (), and then the surface of the charged photosensitive drum 10 is exposed. An electrostatic latent image is formed by irradiating the light of the means 12 (), and then the electrostatic latent image is developed by the first developing machine 13 of the developing machine control device to form a first electrostatic latent image on the surface of the photosensitive drum 10. A black toner image as the first color is formed (), and the photosensitive drum 10 applies surface charge to the erase lamp 1.
By being adjusted by 9, the second color is charged again (). When the photosensitive drum 10 is rotated, when the development of the first developing machine 13 is completed, the controller 100 drives the regulating member 7 via the regulating member driving portion 75, and the regulating member 7 is applied to the developing roll 5 as shown in FIG. The amount of the developer 2 that moves toward the lower side and flows to the developing roll 5 is suppressed. Next, the support base 81 is driven through the case drive unit 83, and the case 1 of the first developing machine 13 rotates counterclockwise about the fulcrum shaft 8 to retreat from the developing working position to the developing non-working position. At the same time, the rotating shaft 91 is driven through the shutter driving unit 92 to close the shutter 9, and the shutter 9 covers the exposed portion of the developing roll 5. At that time, the developing roll 5 of the first developing machine 13 remains driven. As a result, when the first developing machine 13 finishes the development, first, the flow of the developer 2 is suppressed by the regulating member 7,
Since the amount of the developer 2 flowing to the developing roll 5 can be made minute, compared to the first conventional technique, the carrier of the developer 2 is prevented from scattering even when the developing roll 5 rotates at a high speed. It is possible to reduce the amount of scattering even if it is scattered. In addition, since the shutter 9 closes with the movement of the case 1 after the restraint by the regulating member 7, it is possible to reliably prevent the carrier from scattering.

On the other hand, the photosensitive drum 10 charged for the second color by the charger 11 is exposed by the exposing means 12 as shown in FIG.
After non-contact development, a second color toner image different from the black toner image is formed (), and then electrostatically transferred to the recording paper 16 by the transfer device 15 (). When the development of the second developing machine 14 is completed, the first developing machine 13 is operated by the controller 100 as shown in FIG.
As a result, the regulating member 7 moves upward to move away from the developing roll 5 and returns to its original position. Thereby, the first developing machine 13
Then, when the suppression of the developer 2 is released, the developing roll 5 remains rotating, so that the developer 2 is required for development as compared with the second conventional technique in which the driving of the developing roll is stopped during the retreat. The amount of the developer 2 immediately flows into the developing roll 5, and the flow of the developer 2 can be quickly stabilized. In this case, since the charging state of the developing roll 5 does not change due to the rotation of the developing roll 5, the carrier is not scattered when the developer 2 flows to the developing roll 5. Further, since the developing roll and the movement amount of the regulating member 7 are extremely minute, it does not take much time to return to the original position, and therefore, the flow of the developer 2 can be reliably stabilized.

After the regulating member 7 returns to its original position,
The controller 100 opens the shutter 9, the shutter 9 releases the covering of the exposed portion of the developing roll 5, and the case 1 is rotated counterclockwise by the drive of the support base 81 to move from the non-acting position to the developing action. Move to position. Therefore, when the shutter 9 is opened after the regulating member 7 has returned to its original position, the flow of the developer 2 is already in a stable state, so that the flow is unstable as in the second conventional technique. The carrier in the state does not scatter on the photosensitive drum 10, and the occurrence of the fogging phenomenon can be prevented.

Further, since the case 1 of the first developing machine 13 is rotatably mounted between the developing working position and the developing non-working position, it will be described below in comparison with the case where the case is moved linearly. There are merits. That is, when the case moves in a straight line, if a slight deviation in the movement amount occurs, the case may approach the photosensitive drum and damage the photosensitive drum, but even if the rotation angle of the case 1 slightly changes,
The case 1 does not come too close to the photosensitive drum 10,
Not only is there no risk of scratching the photosensitive drum 10, but the developing conditions can be kept substantially constant. In addition, even if the carrier is scattered by the time the shutter 9 is opened and the case 1 is moved to the developing action position, most of the scattered carriers are scattered in the rotational tangential direction of the developing roll 5. As in the example, if the rotation direction of the developing machine 13 is the direction along the rotation direction of the photosensitive drum 10,
At the time of development, the carrier attached to the photosensitive drum 10 can be taken into the developing device 13 again, and the actual amount of scattering can be suppressed to that extent. The photosensitive drum 10 transferred to the recording paper 16 is removed by the cleaner 18 and discharged by the eraser lamp 19, and then the next printing is performed. In the embodiment of the method of the present invention, the example in which the shutter 9 is closed during the retracting movement of the first developing machine 13 is shown, but even if the shutter 9 is closed at the time when the first developing machine 13 finishes retracting, The same effect can be obtained.

In the developing machine control apparatus of the embodiment, the movement of the case 1, the movement of the regulating member 9 and the movement of the shutter 7 of the first developing machine 13 are controlled accurately by the controller 100, respectively. Can be operated reliably. Since the regulating member 7 has a fine adjustment knob 74 and the distance between the developing roller 5 and the regulating member 7 can be adjusted by operating the knob 74, the adjusting operation of the regulating member 7 with respect to the developing roller 5 is easy. You can In the electrophotographic apparatus of the embodiment, the controller 100 of the developing machine controller controls the first and second developing machines 13 and 14, respectively, but the present invention is not limited thereto. It is also possible that the controller 100 controls the electrophotographic apparatus as a whole. Further, the second developing machine 14 is of a non-contact developing type, and there is no risk of carrier scattering, so an example in which the second developing machine 14 is fixed is shown. However, similar to the first developing machine 13, contact developing is performed. It is also possible to configure the type. In that case, the second developing machine 14 is configured in the same manner as the respective components of the first developing machine 13, and the second developing machine 14 is retracted and moved during the development of the first developing machine 13, and the first developing machine 1 is used.
It is needless to say that the same effect can be obtained even if the developing device 3 is retracted after the development is completed and the developing operation is performed by moving from the non-developing position to the developing working position. Further, as the non-developing member, the photosensitive drum 1
Although the example using 0 is shown, the same effect can be obtained even if the belt is used.

[0017]

As described above, according to claim 1 of the present invention, when the developing machine finishes the development, the flow of the developer to the developing roll is first suppressed, so that the developing roll rotates at a high speed. However, the carrier of the developer can be prevented from scattering, and even if the carrier scatters, the amount of scattering can be greatly suppressed, and as a result, there is an effect of not contaminating the surroundings. According to the second aspect, since the flow of the developer to the developing roll is suppressed and the developing roll is covered with the shielding member, carrier scattering can be surely prevented, and the effect of the first aspect can be further enhanced. According to the third and fourth aspects, during development, when the developing machine is in the non-developing position, the regulation member releases the suppression of the developer, and thereafter, the developing machine is moved to the developing working position and the shielding member is provided. Since the flow of the developer can be stabilized quickly because the opening is made possible, in addition to the effect of claim 2, the developer does not develop in an unstable state, and the image density There is an effect that there is no fear that it will become low. According to claims 5, 6 and 7 of the present invention,
According to claims 10, 11, and 12, the method according to claims 1, 2, 3 and 4 can be carried out accurately, and the development roll can be rotated at a high speed without contaminating the surroundings with a carrier. Since high-speed printing is enabled by this, and high-speed printing can be sufficiently dealt with, there is an effect that high-quality printing and high-speed printing can be achieved. Further, according to claims 8 and 13, since the distance between the developing roll and the regulating member can be adjusted,
The position of the restricting member can be easily adjusted, and according to claims 9 and 14, even if the rotation angle of the developing device is slightly misaligned, there is no possibility of damaging the non-developing member. is there.

[Brief description of drawings]

FIG. 1 is an explanatory view of a developing machine in a non-developing state showing an embodiment of an electrophotographic apparatus to which a developing machine controller for carrying out the method of the present invention is applied.

FIG. 2 is an explanatory view of a developing state of the developing machine.

FIG. 3 is a schematic explanatory diagram of a developing device control device.

FIG. 4 is an explanatory diagram showing a main part of a regulating member in the developing machine.

FIG. 5 is an explanatory diagram showing a main part of a shutter.

FIG. 6 is an explanatory diagram showing a rotation structure of a developing machine.

FIG. 7 is an explanatory diagram showing a schematic configuration of an electrophotographic apparatus.

FIG. 8 is a diagram for sequentially explaining various processes of printing on recording paper.

FIG. 9 is a time chart showing the operation of the first developing machine based on FIG.

[Explanation of symbols]

1 ... Developing machine case, 2 ... Developer, 5 ... Developing roll, 7
... regulating member, 8 ... fulcrum shaft, 9 ... shutter as shielding member, 10 ... photosensitive drum as non-developing member, 13 ... first developing machine, 14 ... second developing machine, 75 ... regulating member drive section, 92
... Shutter drive section, 83 ... Case drive section, 100 ... Controller.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Shinichi Nishino 1060 Takeda, Katsuta City, Ibaraki Prefecture Hitachi Koki Co., Ltd.

Claims (14)

[Claims] 1. A developing machine having a developing agent and a developing roll partially exposed to the non-developing member side and feeding the developing agent to the exposed portion to develop the non-developing member. A method for controlling a developing machine, which comprises suppressing an amount of a developer flowing to a developing roll at a time point. 2. A developer, a developing roll partially exposed to the non-developer side and developing the non-developer, and a regulating member for regulating the developer sent to the developing roll to an amount necessary for development. And a shielding member capable of covering the exposed portion of the developing roll, the developing member is moved from the non-developing position to the developing working position during development, and the shielding member releases the covering of the developing roll to perform development and non-development. At the time, when the developing device is moved from the developing action position to the developing non-action position and the shielding member covers the exposed portion of the developing roll, when the developing device finishes the development, the developing roller is placed on the developing roll. When the amount of the developer conveyed to is suppressed, and after the suppression, the developing machine retreats and moves by the amount that the gap between the non-developer and the developing roll reaches at least the distance necessary for the operation of the shielding member,
A method for controlling a developing machine, wherein a shielding member covers an exposed portion of the developing roll. 3. A developer, a developing roll partially exposed to the non-developer side and developing the non-developer, and a regulating member for regulating the developer sent to the developing roll to an amount necessary for development. And a shielding member capable of covering the exposed portion of the developing roll, the developing member is moved from the non-developing position to the developing working position during development, and the shielding member releases the covering of the developing roll to perform development and non-development. At the time, when the developing device is moved from the developing action position to the developing non-action position and the shielding member covers the exposed portion of the developing roll, when the developing device finishes the development, the developing roller is placed on the developing roll. When the amount of the developer conveyed to is suppressed, and after the suppression, the developing machine retreats and moves by the amount that the gap between the non-developer and the developing roll reaches at least the distance necessary for the operation of the shielding member,
While the shielding member covers the exposed portion of the developing roll and moves the developing machine to the non-acting position of the developing roll, on the other hand, at the time of development, after releasing the restraint of the flow of the developer to the developing roll in the developing machine, the developing roll of the shielding member. A method for controlling a developing machine, which comprises removing the cover for the developing machine and moving the developing machine from the non-developing position to the developing working position. 4. A developer, a developing roll that is partially exposed to the non-developing side and develops the non-developing body, and a regulation that regulates the developer conveyed to the developing roll to an amount necessary for development. A member and a shielding member capable of covering the exposed portion of the developing roll, and during development, the shielding member moves from the development non-acting position to the developing action position, and the shielding member releases the covering for the developing roll to perform development, and At the time of non-development, in the developing machine in which the shielding member covers the exposed portion of the developing roll while retracting from the developing working position to the developing non-working position,
At the time of completion of development of the developing machine, a suppressing step for suppressing the amount of the developer conveyed on the developing roll, and after the suppressing step, the developing machine is moved from the developing operation position to the developing non-operation position and A closing step of closing the exposed part of the developer with a shielding member, a suppression release step of releasing the suppression of the amount of the developer to the developing roll before the developing machine moves to the developing action position during the development of the developing machine, and the release After the step, the step of releasing the shielding of the shielding member from the developing roll and moving from the developing non-acting position to the developing action position is performed. 5. A developer, a developing roll partially exposed to the non-developer side and capable of developing the non-developer, a regulating member movably mounted toward the developing roll, and an exposed part of the developing roll. A developing machine that includes a shielding member to obtain, and that moves from the developing non-acting position to the developing working position during development, and retracts from the developing working position to the developing non-acting position during non-developing;
And a control means for controlling the developing machine, wherein the control means moves the regulating member toward the developing roll when the developing machine finishes developing, and suppresses the amount of the developer conveyed to the developing roll. A developing machine control device characterized by the above. 6. A developer, a developing roll partially exposed to the non-developer side and capable of developing the non-developer, a regulating member movably mounted toward the developing roll, and covering the exposed part of the developing roll. A developing machine that includes a shielding member to obtain, and that moves from the developing non-acting position to the developing working position during development, and retracts from the developing working position to the developing non-acting position during non-developing;
And a control means for controlling the developing machine, wherein the control means moves the regulating member toward the developing roll when the developing machine finishes developing, and suppresses the amount of the developer conveyed to the developing roll. Controlling a developing machine, comprising: a suppressing means, and a means for moving the developing machine from the developing operation position to the developing non-operation position while the shielding member covers the exposed portion of the developing roll when the suppressing means suppresses the development roller. apparatus. 7. A developer, a developing roll partially exposed to the non-developer side and capable of developing the non-developer, a regulating member movably mounted toward the developing roll, and covering the exposed part of the developing roll. A developing machine that includes a shielding member to obtain, and that moves from the developing non-acting position to the developing working position during development, and retracts from the developing working position to the developing non-acting position during non-developing;
And a control means for controlling the developing machine, wherein the control means moves the regulating member toward the developing roll when the developing machine finishes developing, and suppresses the amount of the developer conveyed to the developing roll. And a means for moving the developing device from the developing working position to the developing non-working position while the shielding member covers the exposed portion of the developing roll when the suppressing means suppresses,
A means for releasing the restraint of the developer by the regulating member when the developing machine is in the development non-acting position, and a mechanism for moving the developing machine to the developing action position and releasing the covering of the developing roll by the shielding member when the restraint is released. And a developing device control device. 8. The developing device controller according to claim 5, wherein the regulating member has a fine adjustment knob for adjusting a distance to the developing roll. 9. The developing device is supported rotatably along a moving direction of a non-developing member around a fulcrum between a developing working position and a developing non-working position. 5
The developing machine control device according to any one of items 1 to 7. 10. A non-developing member, a charger for charging the surface of the non-developing member, an exposing means for forming an electrostatic latent image on the surface of the non-developing member, and a developing device control device. The machine control device includes a developer, a developing roll partially exposed to the non-developer side and developing the non-developer in a non-contact manner, a regulating member movably mounted toward the developing roll, and an exposed part of the developing roll. A non-developing member, and while moving from the non-developing position to the developing working position,
At the time of non-development, a first developing machine retracted from the developing working position to the developing non-working position, and a developing working position of the first developing machine for developing the non-developing body by non-contact by the second developing machine. A second developing machine fixed at a different developing working position, a first developing machine,
And a control means for controlling each of the second developing machines, the control means moving the regulating member toward the developing roll when the first developing machine completes the development and conveying the regulating member to the developing roll. An electrophotographic apparatus, comprising: a suppressing unit that suppresses the amount of the developing agent. 11. A non-developing member, a charger for charging the surface of the non-developing member, an exposing means for forming an electrostatic latent image on the surface of the non-developing member, and a developing device control device. The machine control device includes a developer, a developing roll partially exposed to the non-developer side and developing the non-developer in a non-contact manner, a regulating member movably mounted toward the developing roll, and an exposed part of the developing roll. A non-developing member, and while moving from the non-developing position to the developing working position,
At the time of non-development, a first developing machine retracted from the developing working position to the developing non-working position, and a developing working position of the first developing machine for developing the non-developing body by non-contact by the second developing machine. A second developing machine fixed at a different developing working position, a first developing machine,
And a control means for controlling each of the second developing machines, the control means moving the regulating member toward the developing roll when the first developing machine completes the development and conveying the regulating member to the developing roll. And a means for moving the first developing machine from the developing working position to the developing non-working position while the shielding member covers the exposed portion of the developing roll when the suppressing means suppresses the amount of the developer. And an electrophotographic apparatus. 12. A non-developing member, a charger for charging the surface of the non-developing member, an exposing unit for forming an electrostatic latent image on the surface of the non-developing member, and a developing device control device. The machine control device includes a developer, a developing roll partially exposed to the non-developer side and developing the non-developer in a non-contact manner, a regulating member movably mounted toward the developing roll, and an exposed part of the developing roll. A non-developing member, and while moving from the non-developing position to the developing working position,
At the time of non-development, a first developing machine retracted from the developing working position to the developing non-working position, and a developing working position of the first developing machine for developing the non-developing body by non-contact by the second developing machine. A second developing machine fixed at a different developing working position, a first developing machine,
And a control means for controlling each of the second developing machines, the control means moving the regulating member toward the developing roll when the first developing machine completes the development and conveying the regulating member to the developing roll. And a means for moving the first developing machine from the developing working position to the developing non-working position while the shielding member covers the exposed portion of the developing roll when the suppressing means suppresses the amount of the developer. A means for releasing the restraint of the developer by the regulating member when the first developing machine is in the non-developing position, and a shield member for moving the first developing machine to the developing working position when the restraint is released. And a means for releasing the covering of the developing roll by the electrophotographic apparatus. 13. The electrophotographic apparatus according to claim 10, wherein the regulation member has a fine adjustment knob for adjusting a distance to the developing roll. 14. The first developing machine is rotatably supported along a moving direction of a non-developing member around a fulcrum between a developing working position and a developing non-working position. The electrophotographic apparatus according to claim 10, wherein