JPS61201270A - Developing device for color selectable monochromatic copying device - Google Patents

Abstract

PURPOSE:To facilitate operation for color changing by allowing individual developer discharging and recovering means of a developer storage part to stop at positions facing a developing sleeve and rotate between individual stop positions. CONSTITUTION:When a supply roller 17 (developer discharging and recovering means) rotates counterclockwise, a black developer 16B moves counterclockwise and the developer is charged electrostatically at the same time, and sent out of a developer chamber 15B to developing sleeve 12, thereby developing a latent image on the surface of a photosensitive body 1. A developer which is not used for the development is used for the development while mixed with a developer which is discharged newly below the developing sleeve 12. When the black copying operation is completed, the supply roller 17 is rotated backward, i.e. clockwise and an applied voltage is switched at the same time, so that a black developer around the developing sleeve 12 is attracted to the supply roller 17 and recovered in the black developer chamber 15B. Then, the developer storage part 13 is rotated to carry the replenishing roller 17 of a green developer chamber 15G to the position facing the developing sleeve 12, and then green copying operation is carried out.

Description

[Detailed Description of the Invention] W Portion” The present invention relates to a development method in which a latent image formed on a latent image carrier such as a photoconductor is brought into contact with a developer of a different color to develop the latent image in a different color. Regarding equipment. This developing device is a monochrome copying machine (color selectable) that can copy an image of a document in any single color such as black, red, or green.
(sometimes called mono-multicolor copying machines). Prior Art Conventionally, in monochromatic copying machines capable of selecting colors as described above,
A plurality of developing devices are arranged facing a latent image carrier such as a photoreceptor, and developers of different colors are stored in the developing devices, and any one of the developing devices is selected to perform a developing action. There are some devices that allow copying to be performed in a desired color. deer! Therefore, this apparatus requires a large space around the latent image carrier due to the use of a plurality of developing devices, which poses a problem in downsizing the entire copying machine. In addition to the above-mentioned copying machine, the latent image carrier, the developing device, and other equipment to be arranged around the latent image carrier are formed in advance as one unit I-, and a plurality of such units are prepared. In some cases, developers of different colors are stored in developing devices in individual units. With this copier,
Usually, only one developing device is installed in a copying machine, and when copying is to be performed with a different color, the entire unit must be replaced. Although this method requires a small space for the developing device on the copying machine side, it is uneconomical because a unit must be prepared for each color. Moreover, the work for replacement is troublesome. In view of the above-mentioned points, it is an object of the present invention to provide a developing device that does not require a large space and can be easily operated for changing colors. The purpose of item 1 of ``2-Castle-'' is achieved by the following configuration. In a developing device that develops a latent image formed on a latent image carrier in a different color by bringing a developer of a different color into contact with the latent image, it is disposed opposite to the latent image carrier and housed in a developer container. a developing sleeve, a developer storage section having a plurality of developer chambers arranged at appropriate intervals from the developing sleeve in the developer container and containing developers of different colors; A developer discharging and collecting means is provided for the chamber and is capable of discharging and collecting the developer. is configured to be rotatable between the above-mentioned individual stop positions. Hereinafter, the present invention will be explained using drawings showing embodiments thereof. FIG. 1 is a side view of essential parts of an embodiment of the present invention. This embodiment uses a so-called -component type developer which does not contain a carrier and is mainly composed of toner. In the figure, a drum-shaped photoreceptor 1 is surrounded by a charger 2, an erase lamp 3, a developing device 4, a transfer charger 5, a cleaning device 6, and A static elimination lamp 7 is arranged. When a copying operation is started, the surface of the photoreceptor 1 is first uniformly charged by the charger 2, and then the charge on unnecessary portions is removed by the erase lamp 3. -6=The charged portion of photoreceptor 1 then reaches 1 light position E. A light image L from an exposure optical system (not shown) is irradiated onto the exposure position E, and as a result, an electrostatic latent image corresponding to the original image is formed on the surface of the photoreceptor 1. The latent image moves due to the clockwise rotation of the photoreceptor 1, reaches the developing device 4, and is developed into a developed image by applying a developer from the developing device 4. The developed image is sent from a paper feeding device (not shown), and then transferred to registration roller No. 8.
is superimposed on the transfer paper 9, and by the action of the transfer roller 5, the transfer paper 9 is transferred 1. In other words, it is transferred. Is the transfer paper aligned with conveyor bell 1-10 after transfer? , te, diagram 1
No, the image is ejected to the outside via the fixing device. On the other hand, the surface of the photoreceptor 1 after the transfer is cleaned by a cleaning device 6,
After the static electricity is removed by the static electricity removal lamp 7 1. Re-copying of the buttocks is performed. 1 The current moaning device 4 is the first one? As shown in the figure, there is a developing container 11, and a male figure 3/12 is placed on the left side of the developing container 11 in a position facing the photoreceptor ↓5.
It has a developer accommodating portion 11.3 located within the developer container 11 and spaced apart from the developer sleeve 12 by an appropriate distance. The developing sleeve 12 can rotate in the counterclockwise direction in the figure around the shaft 14, and although not shown in the figure, it has a grommet inside thereof which is necessary for conveying the developer described later. Further, on the developing sleeve 12, a voltage determined based on the potential of the surface of the photoreceptor 1, for example, a developing voltage v1 of about +30 QV is printed. The developer storage section 13 includes a plurality of (three in the figure) developer chambers 1.
5B, 15R1, and 15G, and a black component developer 16B, a red component developer 16R1, and a green component developer 16G are stored in each of these chambers, respectively. . Also, each developer chamber 15B□=:,' 1.5
R and large 5G are each equipped with a replenishment roller 17 as a developer discharge and collection means. The replenishment roller 17 can be rotated about a shaft 18 in a forward direction or in a counterclockwise direction. In the illustrated state, the replenishment roller 717 of the black developer chamber 15B is the developing sleeve 71? , but 4. During these 5 pauses, our replenishment roller 17 is anti-[I? A black developing mold near the small town supply Ronilla 17 rotating in the q↑ direction, 1. . 6B mechanically follows the supply roller 17! ,,”6 anti-B?
Bees in the direction of town, movement, resulting in 4 supply lows? ,■,7.
1.2. , meeting, . and is sent out. That is, 5, active agent (7) July
中力) row, tai, □ ya1reru. Rotate supply roller 1.7 counterclockwise! 4
Te: l 1 Black, current? : Agent 16. When B is discharged, temporary opening, 7
i 1゜71. Note: Preliminary and developing sleeve 5-5 voltage 1. Example book-3
(approximately 0, q, v force) Tsu, sa, hang down (,! Down, when temporarily replenishing this voltage! Pressure ζ Riu), yo? , the amount of developer discharged is 51. ,, Supply roller Snake7. ψ, conductive brush j or i other conductive elastic member in contact with the upper part 1? When you pass through, you will reach the designated number 9, heavy color! , electric wire,
, i, ,
The above replenishment voltage is on the black, developing, and image side! Charge 6B. It's meant to be done, so that's it! The pressure contact property and the electrometical value are changed as appropriate depending on the black color and the properties of the developer 16B. For example, if the coating contains a so-called charge control agent, 1. mark, addition 1
Regardless of the polarity of the pressure, the black color, image side, is charged depending on the negative polarity, for example, Q. From 1, the polarity of the voltage at the time of replenishment may be either Φe. ,
(The black developer 16B charged in this way is
Currently, image moxibustion,, -7,,,'near 1. ．． ．． ．． 2, the photoreceptor 1. surface, L1 touch 13
1. At step 1, it electrostatically attaches to the electrostatic latent image. Applicable! Develop an image. Doesn't it contribute to development? Ta. ,
The developer 1° agent is 1. Passing through the underside of the current Kusu, Rini, and Bu 12, a new one. While wandering, hitting, falling, back, and mixing with the image side, it is once again subjected to the developing process. The cartridge is held in a preliminary chamber 20 formed in the upper part of the developer container 11. ,Thus, Honkai Shi performs the black copying in the example in scene 5.
, “1□: Rusuke 1’s 4! purpose has been revealed.
;. When the operator wants to copy one color instead of black copying, ``Mutsumi - Fallen Tree Thousand-Ichishiki Copying'', 1. Developer storage section. 1.3, ρ1, whole 1, center, central axis 21.
With ψ in the center and the clock on the hour, look at the clockwise direction and look at the green developing chamber 1.
5G supply port. 1□11 Leek, 1.7, (move to the position opposite the developing station 1 bus 12. now.) Then, after that, the above-mentioned gift and the effect of Isshuo 1 will be very dark. The color, current, and Q116G are supplied to the developing sleeve 12 for development work.In this way, a green copy is made instead of a black copy, but immediately after the black copy is made, the developer is stored in the developer storage section. If 13 is to be rotated,
Since the black developer remains around the developing sleeve 12, when the green developer 16G is then newly supplied to the developing sleeve 12, the black developer lF3B and the green developer 16G are mixed, and as a result, , the desired clear green copy cannot be obtained. Therefore, for green development,
Before supplying the green bowl image side 16G to the developing sleeve 12, the developer from around the developing sleeve 12, that is, the black developer 1.5 B must be removed. The following methods can be considered as removal methods. That is, after the black copying operation is completed, the above-described copying process omitting the image exposure L (FIG. 1) is executed to create a solid black image, thereby removing the black developer remaining around the developing sleeve 12. It consumes 16T3. However, in this method, black developer 1.6 B and transfer paper 9 (first
Figure) is uneconomical because it is wasted. Therefore, in this embodiment, the above-mentioned inconvenience is solved by having the replenishment roller 17 also perform the agent recovery work. The details will be explained below. In FIG. 2, even after the black copying operation is completed, the developer storage section 13 does not immediately rotate, but first the replenishment roller 17 rotates in the reverse direction, that is, in a clockwise direction. At the same time, the replenishment voltage e that has been applied to the replenishment roller 17 until then has the same polarity as the bias voltage V of the developing sleeve 12 (that is, the polarity that can attract the developer charged to θ); The voltage is switched to a voltage higher than 1 (hereinafter referred to as the voltage at the time of recovery). If the bias voltage v1 of the developing sleeve 12 is about +300, the voltage at the time of collection is +80.
It is set to about 0v. By switching the rotational direction and applied voltage of the replenishment roller 17 as described above, the black developer around the developing sleeve 12 is attracted to the replenishment roller 17 and collected into the black developer chamber 15B. In order to prevent the black developer from being discharged outside due to the clockwise rotation of the replenishment roller 17 during collection of developing rain, a blade 22 is attached to the lower chamber wall of the replenishment roller 17 so that its tip is in contact with the replenishment roller 7.
is installed. When the black developer 1.6B has been collected, the developer storage section 13 rotates as described above, and the replenishment roller]7 of the green developing chamber 1.5G is carried to a position opposite to the developing sleeve 12, and then , green copying work is performed. This time, since no black maple developer 16B remains around the developing sleeve 12, no color mixing occurs). The above explanation is for the case of color change between black copy and green copy, but the same effect applies to color change between other colors. □ In the second embodiment, one developing sleeve 12 is provided.
In one developer container 11-, "a plurality of developer chambers 15B,"
], '5R115G developer storage section 13 is arranged rotatably, and one of the developing chambers is selected by rotating the developer storage section 13. Therefore, multiple developing devices are not required. It does not require a large space compared to conventional equipment. Therefore, the copying machine can be made smaller. Further, there is no need to replace the developing device, so the work is easy. Note that the member designated by the reference numeral 23 located above the developing sleeve 12 in FIG. 2 is a sealing member that prevents the developer from scattering. The supply roller 17 does not necessarily need to rotate in a clockwise direction, but may simply rotate in one direction. For example, if you want to rotate only counterclockwise,
The developer is discharged from the upper side of the supply roller 17.
Collection is performed from below the supply roller 17. If collection is carried out from below the supply roller 17, the blade 2
If 2 is in the position shown in FIG. 2, it will obstruct the recovery operation, so it is desirable to shift its position in advance to the inside of developer chambers 15B to 15G. When the supply roller 17 rotates only in the clockwise direction,
Discharging will occur from below the replenishment roller 17, and recovery will occur from above. FIG. 3 shows another embodiment of the invention. This embodiment differs from the previous embodiment shown in FIG. 2 in that a so-called two-component developer consisting of a carrier and a toner is used as the developer. The members indicated by the same reference numerals as those in the embodiment of FIG. 2 are the same members, and the explanation thereof will be omitted. . Even if a two-component developer is used, the field image side storage section 13
Each of the developing chambers 15B, 15R115G is a door in which a black toner 26B, a red toner 26R1, and a green toner 26G are stored, respectively, and a carrier is not included. The carrier is indicated by the symbol 25,
It is always placed on the circumference of the developing roller 112 and moves according to the rotation path of the Q sleeve 12.
. If you say black servant complex,! When the signal to start copying is given, the supply roller 27 rotates counterclockwise in the same way as in the case of FIG. During the process, carriers are supplied while being charged by a conductive brush 19 or the like. After that, Kuromu Tona, Ej, and B are conveyed clockwise around the developing sleeve 12 by the carry 25, and transferred onto the photoconductor 1 at a position facing the photoconductor 1. The latent image on the photoreceptor 1 is developed. Since the toner is charged by friction while being conveyed by the carrier 25, if this frictional charging is sufficient, there is no need for charging using a conductive brush 1.9 or the like. When the previous toner, for example, black toner 2.6B, is to be collected into the developer chamber 15B for color change, the replenishment rollers 2 and 7 are reversed as in the embodiment shown in FIG. The applied voltage is switched to the voltage at the time of collection described above. Then, the black toner mixed with the carrier 25 on the developing sleeve 12 is separated from the carrier 25 and is attracted to the supply roller 27, and further collected into the developer chamber 1.5B. Carrier No. 2 becomes fatigued as copying work progresses, so it is necessary to replace it with a new one at an appropriate time. For this purpose, it is desirable to provide a hole for replacing the large cartridge at an appropriate location in the portion of the developing container 11 that accommodates the developing sleeve 12. This hole in the middle is covered. Fig. 4 shows still another embodiment of the present invention. This embodiment uses a two-component developer, and in this respect, Fig. 3 shows a further embodiment of the present invention. The difference is that in the case of Fig. 3, the toner of the two-component developer is stored in the developer chambers 1.5B and 15R115G, and the carrier is placed around the developing sleeve. However, in this embodiment, the two-component developer in which carrier and toner are mixed is stored as is in each of the developer chambers 15B and 15R115G. Inside the developer chamber are black, red, and green two-component developers 36B and 36R, respectively.
136G is stored. The developer in each developer chamber is removed from the replenishment roller 3 by counterclockwise rotation of the replenishment roller 37, which serves as a developer discharge and recovery means.
The toner is sent out from above 7 toward the developing sleeve 12, and is recovered into the developer chambers 1.5B to 1.5G from one side of the replenishment roller 37 by clockwise rotation of the replenishment roller 37. In this case 1. Development, agent 1. Tona inside, -
Since it is frictionally charged when it is transported and transported together with the carrier, the replenishment rollers (1, 7, , 2, 7) ), it is necessary to charge the toner with millet. Therefore, in the case of the present trial (Example), Jh, 1, no voltage was applied to the m feed roller 3.7, and conductive brushes, etc. (Fig. 1, 2 The reference numeral 19) in the figure is also not provided. The supply port brush 7 can be formed into a simple cylindrical shape, but in order to improve the efficiency of discharging and collecting the developer, it is formed into a so-called paddle shape as shown in FIG. Alternatively, magnets may be arranged inside the supply roller 37 at appropriate intervals to form a so-called magnet roller, and the developer may be discharged and collected under the action of magnetic force. The developing sleeve 12 that conveys the two-component developer is provided with several magnets 30 therein, and the developer is generally conveyed to the photoreceptor 1 by the magnetic force from these magnets. Here, if the developer on the developing sleeve 12 is placed under magnetic force on any surface, the developer is transferred to the replenishing roller 37.
I can't do the recovery work properly. Therefore, in order to solve this problem, the magnet 30 is not arranged inside the portion of the developing sleeve 12 that faces the replenishment roller 37.
In addition, a magnetic metal piece 31 such as an iron piece is placed in the core, so that no magnetic force acts on the developer that has reached the core. Therefore, the developer that has reached this area is separated from the developing sleeve 12 and is removed from the developing container in the lower part of the developing sleeve 12.
It falls and accumulates in the four parts 32 provided in the first part. When the supply roller 37 rotates clockwise, the developer once stored in the four parts 32 is collected into the developer chambers 1.5B to 15G. 82-component developer 36B-3 in each developing chamber 15B-15G
According to this embodiment, which accommodates 6G, a carrier is dedicated to each color, and there is no need to use a common carrier for each color as in the embodiment shown in FIG. As a result, the life of the carrier itself can be extended. In the above embodiment, the case where the color is changed between three colors, black, red, and green, has been described as an example, but it is of course possible to use any other color. Furthermore, by increasing the number of developer chambers 15B to 15G, the number of colors that can be changed can be increased accordingly. Further, in the above embodiments, a so-called dry developer such as a one-component developer, a two-component developer, etc. was used, but a wet developer may be used instead. Effects: According to the present invention, colors are changed by rotating the developer storage section housed in the developer container, so it takes up less space than when multiple developer containers are provided. It is enough. In addition, there is no need to replace the developer container or the like when changing colors, making the work easier.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts of an example of a copying machine using a developing device according to the present invention, FIG. 2 is a side sectional view of one embodiment of the present invention, and FIG. 3 is a side view of another embodiment of the present invention. 4 is a side sectional view of still another embodiment of the present invention, and FIG. 5 is a side sectional view of a modified example of the supply roller. 11 Developing container 12 Developing sleeve '1, "5B,
15R, 15G developer chamber 13 developer storage section 17, "37 replenishment roller (single stage developer discharge and collection)

Claims (6)

[Claims] (1) In a developing device that develops a latent image formed on a latent image carrier in different colors by bringing a developer of a different color into contact with the latent image, a developing container is disposed opposite to the latent image carrier. a developer storage section having a plurality of developer chambers disposed at appropriate intervals from the developer sleeve in the developer container and housing different color developers; A developer discharge/recovery means is provided for the developer chamber and is capable of discharging and collecting the developer, and the developer storage section is capable of stopping each developer discharge/recovery means at a position facing the developing sleeve; A developing device characterized in that the developer storage portion is rotatable between the individual stop positions. (2) The developer is a one-component developer containing conductive toner, and the developer discharge/recovery means is a rotatable replenishment roller, and the rotation of this replenishment roller discharges the developer from the developer chamber. When the developer is discharged, the developer is charged by applying a replenishment voltage of a predetermined polarity depending on the properties of the developer to the replenishment roller, and the voltage applied to the replenishment roller is set to have a polarity opposite to the charging polarity of the developer. 2. The developing device according to claim 1, wherein the developer is sucked and collected by switching to a collection voltage of . (3) The developer is a two-component developer containing carrier and toner, the developer discharge/recovery means is a rotatable replenishment roller, the carrier is always stored around the developing sleeve, and the toner is It is stored in each developing chamber.
The toner is discharged from the developer chamber to the developing sleeve by the rotation of the replenishment roller and mixed with the carrier, and the toner is separated from the carrier by applying a collection voltage with the opposite polarity to the toner charging polarity to the replenishment roller. 2. The developing device according to claim 1, wherein the developing device is recovered by using the developing device. (4) The developer is a two-component developer containing carrier and toner, the developer discharge/recovery means is a rotatable replenishment roller, and the two-component developer is stored in the developer chamber in advance. The developing device according to claim 1, wherein the developer is discharged from the developer chamber and further collected by rotation of the replenishment roller. (5) The developing device according to claim 4, wherein the replenishment roller is a paddle-shaped rotating body. (6) The developing device according to claim 4, wherein the replenishment roller is a magnet roller having a magnet disposed therein.