JPS60131561A - Developing device of color copying machine - Google Patents

Abstract

PURPOSE:To reduce the cubage that a developing device occupies and to reduce a copying machine in size by performing development with toners in respective colors at the same position on a photosensitive roll. CONSTITUTION:The developing device of the copying machine is formed by uniting developing devices for toner particles in respective colors which are provided individually as usual; and the inside is partitioned so as to store plural kinds of toner and stirring rolls for stirring toner and transport rolls 11-1-11-3 for carrying toner are provided in the respective sections. Then, a transport roll for toner of corresponding color is energized to carry the toner to a developing roll. Consequently, development is carried out with toner of each color at the same position on the photosensitive roll, and the cubage that the developing device occupies is reduced to reduce the size of the copying machine.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color i copying machine, and more particularly to an improvement of a developing device for a color copying machine.

PRIOR ART The developing device of a conventional copying machine, as shown in FIG.
a developing device 3 for separating these colors (yellow, magenta, cyan) using a color filter or the like and developing them on a photoreceptor roll 2 in successive development cycles;
4.5.

As shown in FIG. 2, the developing image machine described above is equipped with an agitation roll 6, a two-sport roll 7, and a developing roll 8, which are connected to a toner box 97 containing toner. 'being surrounded.

Therefore, if you attempt to configure a copying machine equipped with a plurality of developing machines using the developing devices of conventional monochrome copying machines, the device will be large and the developing device will occupy most of the space. Teshima game. In addition, since it is necessary to form good spikes of magnetic toner between all of the plurality of developing rolls and the photoreceptor roll, the diameter of the photoreceptor roll is also inevitably large and does not become combed.

Furthermore, since each of these developing devices must be sequentially arranged on the circumference in the rotational direction of the photoreceptor roll, the fl! The charged potential of the photoreceptor roll when it reaches my machine,
In the later cycles, the phenomenon at the farthest distance (the one at the time of reaching the elephant) may be caused by self-discharge, etc.
It may be different.

Purpose of the Invention The present invention has been made in view of the above-mentioned drawbacks, and is configured so that toner of each color can be developed at the same position with respect to a photoreceptor roll, so that toner of each color can be developed with a stable charging potential. At the same time, it is an object of the present invention to reduce the volume occupied by the developing device compared to the case of using a conventional configuration, thereby downsizing the copying machine. It is divided into a plurality of areas for storing a desired number of toners, and a stirring roll for stirring the toner within the area and a transport roll for transporting the toner from the area are provided. In the development cycle of each color, a bias voltage is applied to the development roll in synchronization with the development cycle of each color, and the corresponding sub-roll is energized to convey the toner to the development roll. 3. EXAMPLE The present invention will be described in detail below with reference to the accompanying drawings, FIG.

FIG. 6 shows one embodiment of the developing device according to the present invention.Hereinafter, the development □ cycle will be explained as a cycle in which the photoreceptor roll is developed with cyan +-. A bias voltage is applied to the transport roll 11-3 of the box 13 containing cyan toner by a control device (not shown).
10-5 stirring roll Karatransport roll 11
-3, the toner is conveyed to the developing roll 8, and a desired color, that is, a latent image corresponding to cyan, is visualized on the photoreceptor roll 2.Next, the photoreceptor roll rotates once. , In the development cycle for developing latent fJJ with the next color, that is, magenta, a control device (not shown) changes the bias voltage application to the transport roll from 11-3 to 11-2. The magenta toner is transferred from the stirring roll 10-2 to the transport roll 11.
The toner is conveyed onto the developing roll 8 via the developer roller 8, and the latent image on the photoreceptor roll corresponding to magenta is visualized.

Similarly, this is done for yellow, so that the latent image on the photoreceptor roll is completely developed with the corresponding toner1.In the development cycle for each color mentioned above, for example, the development of cyan toner is When finished, the bias of the blind roll is cut off, and the cleaning blade 12-3 moves so as to be in contact with the current roll g, scraping off the cyan toner remaining on roll 8. At the same time, the balance boat・
The roll 11-3 is slightly reversed, and the supply of cyan toner to the developing roll 8 is stopped.

When the above-described phenomenon cycle is completed, the tilting surface advances to the next transfer and fixing cycle.

At the end of the gutter conveyance of each color in the development cycle described above,
If a magnet-fixed/roll-rotating type dust roll is currently used, it is also possible to drop the residual toner by rotating the roll to a position where there are no magnetic poles.

Effects of the Invention As described above, the present invention integrates the developing devices that were conventionally provided separately for each color, and also divides the circular portion so that a plurality of toners can be stored. In addition, an agitation roll for agitating the toner and a transport roll for transporting the toner are installed in each divided area, and the continuous development cycles of each color are synchronized with the development cycle of each color. By applying a bias voltage to the developing roll and energizing the transport roll of the corresponding color toner to transport the toner to the developing roll, the toner of each color is placed at the same position with respect to the photoreceptor roll. Therefore, toner of each color can be developed with a stable charging potential, and the volume occupied by the developing device can be reduced compared to the conventional configuration, thereby making it possible to downsize the copying machine.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a conventional copying machine, FIG. 2 is a partially enlarged view of the developing device shown in FIG. 1, and FIG. 6 is a schematic sectional view of the developing device according to the present invention. be. (Symbols in the figure) 1: Copying machine, 2: Photoreceptor roll, 5, 4.5: Developing device, 6: Stirring roll, 7: Transport roll, 8
:Developing roll, ? , +3:) Su-box, 10-1
~3: Stirring roll, 11-1~3 Nidoran boat roll, 12-1~3: Cleaning blade, (#1 or 3 people) Figure 1 Factor 2

Claims (1)

[Claims] The inside of the device is divided into a plurality of areas for storing a desired number of toners, and a stirring roll for stirring the toner within the area and a transport roll for transporting the toner from the area are provided. In a continuous development cycle for each color, a bias voltage is applied to the development roll in synchronization with the development cycle for each color, and a transfer roller for the corresponding color toner is energized to sequentially develop each toner. A developing device for a color copying machine characterized by being conveyed on a roll.