JPS592057A - Developing device for multicolor recording device - Google Patents

Abstract

PURPOSE:To prevent mixing of different color toners in single color recording, by arranging one magnetic pole of a magnetic roll so as to face a latent image forming medium during developing, and arranging the part of the magnetic roll between the poles so as to face said medium during nondeveloping. CONSTITUTION:During the developing time, as illustrated in the figure (a), the magnetic pole is opposed to a recording drum 1, and about 2.5-3.5mm. width of a magnetic brush from the end is pressed to the drum 1. During the nondeveloping time, as shown in the figure (b), the part between the poles is opposed to the drum 1 by turning the magnetic roller, and then, the developer layer is thinned by about 2mm. as compared with the developing time, and the contact depth of the drum 1 and the developer becomes about 0.5-1.5mm..

Description

DETAILED DESCRIPTION OF THE INVENTION (4) Field of the Invention The present invention relates to a developing device for a multicolor recording device in which the contact state between an image forming medium and a developer can be adjusted by changing the position of a magnetic pole.

(6) Prior Art and Problems In conventional developing devices used in multicolor recording devices, the relative positions of the latent image forming medium and the magnetic poles of the magnet roller are fixed, and the number of IA images corresponding to the predetermined number of colors is fixed. A device was placed along the #@forming medium. In such a multicolor recording apparatus, it is not only possible to perform multicolor recording, but also single color recording or multicolor recording using a part of the provided developing device is also possible. In reality, rather than using all the developing devices arranged, it is more common to use some developing devices, such as those for monochrome recording. on the other hand,
Each developing device is fixed to the latent image forming medium and is always in a state where it can be developed.At the same pressure for monochromatic recording, the developing device not used for the recording is also mechanically developed. state. Therefore, even if there is a developing device of an unnecessary color from the second developing device onwards among multiple developing devices, the already developed toner image will be rubbed by the magnetic pusher of the unnecessary developing device, which may cause destruction of the toner image. Problems such as the mixing of different color toners into the developing device tend to occur, resulting in failure to obtain good recording. Furthermore, if toner of a different color were mixed in, the developer would have to be replaced frequently.

(C) Purpose of the Invention In view of the above-mentioned drawbacks, an object of the present invention is to rotate the magnetic roller of the developing device by a required angle when monochrome recording is performed in a multicolor recording device, thereby forming a latent image. By changing the relative position between the medium and the magnetic poles of the magnet lawn, the contact depth between the latent image forming medium and the developer is reduced, resulting in a relatively soft developing state, which prevents the toner image from being destroyed, and which also creates an unusual color. The object of the present invention is to realize a developing device for a multicolor recording device that can handle toner mixing.

(C) Structure of the Invention According to the present invention, a latent image forming medium on which a latent image is formed, a plurality of latent image forming means forming a latent image on the latent image forming medium, each latent image forming medium, provided after the image forming means,
a plurality of developing means for conveying and supplying the developing side to a magnetic row 2, which is made of a hollow cylinder of a non-magnetic material and containing a permanent magnet having a plurality of magnetic poles on the outer circumferential surface to visualize the image; During development, one magnetic pole of the magnetic roller is arranged to face the latent image forming medium, and during non-development, the magnetic roller 2 is arranged so that between the magnetic poles faces the latent image forming medium. P2i! will be accomplished.

■ Embodiments of the invention Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. FIG. 1 is a diagram showing a two-color recording device to which the invention is applied. In the figure, 1. Recording drum 1. ＠Electric code 1 2. By 13
). First developer 4. Developing the Yoυ詑-ffi image04
) 0mm binary light to form a second latent image 05), second development 6. A two-color toner image of 0 or more is formed on the drum 1 by developing the electrician m image.

Next, 68 transfer corotrons 7, and 11. The two-color toner f is transferred to. After the transfer, the recording paper is removed by an electrocorotron 8 (not shown), and then passed through a cleaner 9. A cleaning ceremony is performed.

After that, static electricity removal 2 pumps 10. Then, the surface of the recording dome 19 is removed and a new recording cycle is entered.

By sequentially and repeatedly performing the above operations, it is possible to record 928 colors.

Here, a case where monochrome recording is performed will be explained. Second
FIG. 1 is a diagram for explaining a developing device according to the present invention. In the figure, 12 is a magnetic loan with a magnetic force of 800 gauss and a 4-grip configuration, 13 is a sleeve, 14U current agent, and 14-1
i, j: )ner, 14-2 is carrier, 15 is 2 magnetic fields 0 In the above-described configuration, assuming that the distance between the blade (not shown) and the sleeve 13 is 5 [simplified], the developer MiJ!
)' is h1 = 7 to 8 [recommended] at the magnetic poles, and h1 = 5 between the magnetic poles.
~6 [recommended].

For the current KM: #F8 Fig. 3 Fig. 3 Ca Facing the recording drum 1, 2.5 ~
By moving the recording drum 1 by about 3.5 (sw), the developer layer is exposed and the developer layer is 2 [ 1
11! ! ), and the contact depth between the recording drum 1 and the developer is approximately 0.5 to 1.5 (+m, l).

In the configuration as described above, a case will be described in which monochrome recording is performed using only fPJl development.

1), recording drum 1. is uniformly charged by a charging corotron.

2), 8r4-ru (light is applied to form the first thin body).

3) Develop the Q2+-latent image by the -th developability04
), the magnetic pole position setting means (a motor, etc.) is operated by a control system (not shown), and other positions are set in the second actual device. ．． Change field 7 05), transcription corotron 7
, good recording paper 11. 0-turn transfer of two-color toner example.
The recording paper after 4' will be printed on a fixed ice section (not shown), and the toner remaining on the recording drum after transfer will be removed by static elimination corotron 8. Removed with cleaner 9. is cleaned with. After that, the static elimination lamp 10. Then, the surface of the recording drum is neutralized and a new recording cycle begins.

The contact temperature between the drum and the developer is 05-1.5μ℃1. become.

According to Example J, the amount of contact between the developer and the recording drum in the sliding contact position is set at 9 when it is not in development and at V during development.
Since it is possible to reduce the depth by about 2B during development, it is possible to prevent the destruction of the toner image that has already been developed.In addition, if the toner image is destroyed, it is of course possible to prevent toner from entering the developing device. This has the effect that the life of the developer is longer than the conventional one.

In addition, in this embodiment, a two-color recording device using a two-component lead-advanced printer has been described, but it is of course possible to use a recording device with three or more colors as well. Component magnetic toner development may be used, and latent image formation may be performed by sequential exposure and development.
There is no restriction on the f, position state. Further, it is sufficient that the position of each pole can be changed during development and non-development, and the means for doing so may be particularly limited. Furthermore, it is also possible to apply it to a device using electrostatic i'+L recording.

As explained above, according to the present invention, the contact LL between the developer and the recording drum can be changed by changing the magnetic pole position during development and during non-development. Acupuncture δ
Since it is possible to prevent the destruction of the toner image and the mixing of different color toners into the developing device, it is possible to obtain output with good recording quality, extend the life of the developer, and reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a two-color recording device to which the present invention is applied, and FIG. 2-1 is a diagram for explaining a developing device according to the present invention.
FIG. 3 is a diagram showing the developing section and the developing state during non-developing. In the figure, 1 is a recording drum, 2 is an h+i electrocorotron, 3 and 5 are h lights, 4 and 6 are developing devices, 7 is a transfer corotron, 8 is a static elimination corotron, 9 is a cleaner, 10t is a static elimination lamp, and 1lld is a recording paper. 12 is a magnetic roller, 13 is a sleeve, 14-1 is a toner, 14. -2 is carrier, 15
indicates the magnetic field. Funeral Figure 1 Figure 2 (a) (b) and Figure 3

Claims (1)

[Claims] A latent image is formed. A latent image forming medium, a plurality of latent image forming means for forming a latent image on the latent image forming medium, a hollow cylinder provided at the rear stage of each latent image forming means, and having a plurality of magnetic poles arranged on the outer periphery of a hollow cylinder with a slant on the non-emitting side; A plurality of developing means for conveying and supplying the developer to visualize it by means of a magnetic lawn containing a permanent magnet having a surface, and at the time of development, one magnetic pole of the magnetic row 2 is connected to the magnetic lawn. A developing device for a multicolor recording device, characterized in that the developing device is arranged to face a latent image forming means, and is arranged so that the magnetic poles of the magnetic lawns face a latent image forming medium during non-development.