JPS62168177A - Developing device - Google Patents

Abstract

PURPOSE:To prevent colors from being mixed during development by providing an elastic blade which is abutted with a developing roll to level a developer sticking on the developing roll into a thin layer. CONSTITUTION:The device is equipped with an enclosure 41 which contains a developer 48 and has an aperture 42 and the rotatable developing roll 43 is arranged in the enclosure 41 nearby a part to be developed across a specific gap while exposed partially through the aperture 42. Further, the device is equipped with rubbing bodies 44 and 45 which are rubbed against the developing roll 43 to stick the developer 48 stored in the enclosure 41 on the developing roll 43 and an elastic blade 46 which is abutted with the developing roll 43 to level the developer 48 sticking on the developing roll 43 into the thin layer. Thus, the developer 48 is layered thinnly and uniformly by the elastic blade 46 to reduce the weight and cost with a simple structure, and colors are prevented from being mixed in a recording device for a multicolor image.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention is suitable for use in a multicolor recording device capable of recording 1 q of multicolor images using an electrophotographic method, for example. It relates to a developing device.

(Prior art) Recently, for example, electrophotography has been used to produce multicolor recorded images of 1 q.
Multi-color recording devices that are capable of this are being developed. This type of multicolor recording device records a multicolor image on an image carrier by repeating charging, image exposure, and development multiple times.

By the way, the development v used in such a multicolor recording device
Conventionally, a contact type developing device that performs development while in contact with the image carrier has been used as the L-type. However, such a contact type developing device always performs development while being in contact with the image carrier, so for example, when reproducing an unfixed developer image on the image carrier, new developer is added. There was a problem in that color mixing occurred in the recorded image or in the developing device. In addition, since a two-component developer consisting of a carrier and a toner is used as a developer, and a magnetic roll is also required, there are problems in that the structure becomes complicated, the weight increases, and the cost increases.

(Problems to be Solved by the Invention) The present invention solves the problem that color mixing occurs in multicolor development, especially in recording a multicolor image, and the problem that the structure becomes complicated and heavy, and furthermore, the cost increases. The object of the present invention is to provide a developing device that has a simple structure, is lightweight, and can reduce costs. A further object of the present invention is to prevent color mixture during development, particularly in a multicolor image recording apparatus.

[Structure of the Invention] (Means for Solving the Problems) The developing device of the present invention includes a housing that houses a developer and has an opening, and a portion of the housing that is exposed through the opening. , a rotating developing roll that is arranged close to the developing area with a predetermined gap therebetween; and a sliding member that adheres the developer contained in the housing to the developing roll by rubbing against the developing roll. a rubbing body and abutting against the developing roll;
The developing device includes an elastic blade that forms a uniform thin layer of the developer attached to the developing roll.

(Function) With this configuration, non-contact development without mechanical contact with the image carrier becomes possible.

Therefore, for example, when reproducing an unfixed developer image on the image carrier, there is no exchange of new developer, and color mixing can be prevented in the recorded image or in the developing device. Further, a one-component developer can be used as the developer,
Since a rough magnetic roll is not required, the structure is simple and the weight and cost can be reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 2 shows a multicolor recording apparatus to which the current apparatus according to the present invention is applied. That is, 1 is the device main body,
Approximately at the center of the main body 1, a drum-shaped selenium-tellurium alloy photoreceptor (image carrier) 2 is rotatably disposed. The photoreceptor 2 is rotated by a drive unit (not shown) at a predetermined timing based on a signal from an image input unit 3 provided on the left side of the main body 1 and to which an external device is connected. [M/S]
) to be done. Around the photoreceptor 2, there are a first charging corona device 4, an eleventh ED array 5, a first developing device 6, a second charging corona device @7, a second LED array 8, and a second developing device 9. , 3rd charging corona device 1o, 3rd LED 7 Ray 11.13 current@8 position 12, pre-transfer corona device 13, transfer corona device 14, peeling guide 15, static elimination lamp 16
, and the fur brush cleaning device 17 are arranged in this order along the rotation direction Z of the photoreceptor 2. Here, a desired voltage (for example, about 6.5 [KV]) is applied to the first charging corona device 4, and the photoreceptor 2
After the rotation starts, the surface of the photoreceptor 2 is heated to 1000 [V], for example
is uniformly charged. Second. Third charging corona VA holder 7,
10 is selected to be activated or deactivated by either an instruction from an external device or a manual operation from the operation panel 18. 1st to 3rd LED array 5.8.11
The light-emitting point is scan-controlled in accordance with an image signal from an external device, so that the surface of the photoreceptor 2 is imagewise exposed and a desired signal is recorded as an electrostatic latent image. The first to third developing devices 6, 9, and 12 contain cyan toner, magenta toner, and yellow toner, respectively, and reversely develop the electrostatic latent image on the surface of the photoreceptor 2 ( That is, the exposed areas by the first to 31st ED arrays 5.8.11 are developed).

At the lower right side of the main body 1 in the figure, there is an insertion slot 20 for a cassette 19 for storing recording paper. Cassette holder 21, insertion slot 2
A paper feed roller 22 feeds the recording paper one sheet at a time by rolling contact with the recording paper in the cassette 19 in the state in which it is inserted into the cassette holder 21 via the U device. A paper feed section 25 is provided, which includes a pair of registration rollers 23 and a temporary guide 24, which feed the paper to a transfer position between the photoconductor 2 and the transfer corona device 14 in synchronization with the rotation of the photoconductor 2. In addition, in the upper right side of the figure of the main body 1, there is a paper ejection port 26 for ejecting recording paper on which an image has been recorded to the outside of the main body 1, and a paper ejection port 26 that protrudes from the paper ejection port 26 to the outside of the main body 1. Output tray 2 that receives recording paper
7, and a pair of paper ejection rollers 28 disposed within the main body 1 of the paper ejection port 26.

Further, a fixing device 30 is provided adjacent to the paper ejection roller 28, and between the fixing device 30 and the peeling guide 15, the recording paper to be peeled off from the photoreceptor 2 by the peeling guide 15 is fixed to the fixing device 3o. A pair of rollers 3
A conveyor belt 32 is stretched between the two.

In addition, numeral 33 in the figure indicates the first to third charging corona devices 4.
7.10 is a high-voltage power supply, and 34 is a printed circuit board in which a processing circuit for processing signals from the image input section 3 and the like are incorporated.

In such a configuration, when the photoreceptor 2 is rotated in the direction of arrow Z in the figure, the surface of the photoreceptor 2 is uniformly charged by the first charging corona i 4, and then the first LED array 5
An electrostatic latent image is formed on the surface of the photoreceptor 2 by exposure. This electrostatic latent image is developed by the first developing device 6 and cyan toner is adhered thereto. After development by the first developing device 6, the photoreceptor 2 is recharged by the second charging corona device 7, or imagewise exposed by the 21st ED array 8 without being recharged, to form a DI latent image. This electrostatic latent image is developed by the second developing device 9 and magenta toner is attached thereto. After development by the second developing device 9, the photoreceptor 2 is further recharged by the third charging corona device W110, or imagewise exposed by the 31st ED array 11 without being recharged, to form an electrostatic latent image. . This electrostatic latent image is the third reality! It is developed by the SI device 12 and yellow toner is attached thereto. After development by the third developing device 12, the photoreceptor 2 to which the cyan toner, magenta toner, and yellow toner are attached is returned to a uniform charge amount by the pre-transfer corona device 13.

On the other hand, in synchronization with the rotation of the photoreceptor 2, the paper feed section 2
5, the recording paper is supplied to the transfer position and brought into contact with the photoreceptor 2, and the toner images of the respective colors are transferred onto the recording paper by the transfer corona device 14. After the transfer, the recording paper is peeled off from the surface of the photoreceptor 2 by a peeling guide 15 and conveyed to a fixing device 30 by a conveyor belt 32, where the transferred toner image is fixed. After fixing, the recording paper is ejected onto a paper ejection tray 27 via a paper ejection port 26 by a paper ejection roller 28. On the other hand, the photoreceptor 2 from which the recording paper has been peeled is irradiated with light by the charge removal lamp 16 to remove the charge, and is then cleaned by the fur brush cleaning device 17 and prepared for the next recording.

Next, the first to third developing devices 6.9.12 used in this embodiment will be explained. The first to third developing devices 6, 9.12 are generally known developing devices vi.
However, the location is still usable.

If new toner is exchanged when reproducing an unfixed toner image on the photoreceptor 2, problems due to color mixture will occur both in the recorded image and in the developer @8, so this is the preferred method. , a material that does not cause this color mixture is required. In addition, the first to third developing units [6, 9, 12] (Although each device has a slightly different structure depending on the mounting position, the basic elements are the same.

FIG. 1 (U) shows an example of a developing device according to the present invention used as the first to third developing devices 6.9.12. That is, 41 is a housing, and this housing 41 is a photosensitive It has a frontage part 42 in a part facing the body 2.And,
Inside the casing 41, a portion of the housing 41 is exposed through the opening 42, and is placed in a non-contact state with the photoreceptor 2.
A conductive cylindrical roll (developing roll) 43 that is closely opposed to each other while maintaining an image gap of 0[μrrL1, and a fur brush (rotating brushing body) 4 that is in rotational contact with this developing roll 43.
4.45 are arranged. Further, the other end of an elastic blade 46, one end of which is in contact with the developing roll 43, is supported on the inner wall near the opening 42 of the housing 41. The developing roll 43 and fur brushes 44 and 45 are rotationally driven by a motor (not shown), and a developing bias voltage is applied to the developing roll 43 from a bias power supply 47. Note that toner (carrier-less component developer) 48 is housed in the housing 41 .

In such a configuration, when the developing roll 43 and the fur brush 44.45 are rotated, the toner 48 is rubbed by the fur brush 44.45, becomes triboelectrically charged, and is attracted to the surface of the developing roll 43. Forms a thin layer of toner. The formed toner thin layer is regulated to an appropriate thickness by an elastic blade 46 and conveyed to the development gap. The thin toner layer that has reached the development gap is ejected onto the surface of the photoreceptor 2 from the portion where the ejection initiation electric field has been reached. That is, development is performed by an electric field formed by the electrostatic latent image potential of the photoreceptor 2 and the development bias power source. As mentioned above, this developing device does not have mechanical contact with the photoreceptor 2, so it is possible to transfer mixed colors and recorded images to the next developing process (second stage).
(Developing process using the developing device 9 or the third developing device 12)
It is suitable for multicolor development without causing any disturbance.

According to the developing device described above, non-contact type development without mechanical contact with the photoreceptor is possible. Therefore, for example, when reproducing an image from an unfixed toner image on a photoreceptor, there is no new exchange of toner, and color mixing can be prevented in the recording image or in the developing device. It exhibits remarkable effects in multicolor development in recording. In addition, a one-component developer can be used, and there is no need for a magnetic roll, so
The structure is simple, making it possible to reduce weight and cost.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a developing device that is simple in construction and can be made lighter and lower in cost.

Further, according to the present invention, it is possible to prevent color mixing during development, especially in a multicolor image recording apparatus.

[Brief explanation of drawings]

The figures show one practical example of the present invention; FIG. 1 is a block diagram of a developing device, and FIG. 2 is a longitudinal sectional front view of a multicolor recording device. 2...Photoreceptor (aI carrier), 6.9.12.
...First to third developing devices, 41...
Housing, 42...Opening, 43...Developing roll, 44°45...Fur brush (rotating abrasion body), 46...Elastic blade ,47・old・・
Bias power supply, 48... Toner (carrierless component developer). Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (5)

[Claims] (1) A housing containing a developer and having an opening; A rotating developer that is partially exposed inside the housing through the opening and is placed close to the area to be developed with a predetermined gap therebetween. a roll; a rubbing body that causes the developer contained in the housing to adhere to the developing roll by rubbing against the developing roll; a developer that is brought into contact with the developing roll and adheres to the developing roll; A developing device characterized by comprising an elastic blade that forms a uniform thin layer of a developer. (2) The developing device according to claim 1, wherein the developing roll is conductive and a predetermined bias voltage is applied thereto. (3) The developing device according to claim 1 or 2, wherein the sliding member is a rotating sliding member that rotates together with the developing roll. (4) The developing device according to claim 1, wherein the developer is a carrierless component developer. (5) The developing device according to claim 1, which is used in a multicolor recording device that records a multicolor image on an image carrier by repeating charging, image exposure, and development multiple times.