JPS5945150B2 - Developer stirring device in electrophotographic development equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic developing device, and more particularly to a developer stirring device.

In electrophotography, there is a method in which a developer consisting of an iron powder carrier and a toner is adsorbed onto a magnetic roll, and the surface of a recording medium bearing a latent image is rubbed and developed.

In this method, if the latent image on the recording medium is always formed unevenly in places, the toner density of the developer on the magnetic roll will be uneven, and a difference in image density will appear. For this reason, in the past, impellers or screws have been used to move and stir the developer in the axial direction of the magnetic roll.

However, this method requires strong mixing of the developer, so
The disadvantage was that the life of the developer was short. SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus that efficiently stirs developer without reducing the life of the developer.

In order to achieve the above object, the present invention aims to move the developer by scraping the outer periphery of the developer layer on the magnetic roll in order to set the thickness of the developer layer on the magnetic roll to a predetermined value and apply it to the recording medium. Using force, the developer is moved in the axial direction of the magnetic roll by an inclined plate, and stirring is achieved without applying excessive force to the developer.

FIG. 1 shows one embodiment of the invention.

A recording medium 1 having an electric latent image is developed by coming into contact with a developer 2 stored in a container 3 and rotating around a conveyance roll 4 and a magnetic development roll 5. At this time, the developer 2 on the developing magnetic roll 5 is scraped by the regulating plate 6 so that it has a constant thickness. The developer 2 that has completed development is scraped off from the magnetic roll 5 by a scraping plate 8 and used again. The present invention provides a developing device using such a magnetic roll 5, in which regulations yEi,
An inclined plate T is provided to move the developer scraped in step 6 in a direction parallel to the axis of the magnetic roll 5 and to serve for horizontal stirring. Instead of this inclined plate T, a concave channel or a channel having an equivalent function may be used. This is shown in more detail in FIG. When the rotating developer 2 is partially forced by the distributor 6, it hits the regulating plate 6 and falls downward. If an inclined plate 1 set diagonally (see Fig. 4) is placed on this falling path, the developer 2 will fall obliquely along the inclined plate □, and will move in the direction of the axial force of the magnetic roll 5, causing a lateral force. Contributes to stirring in the direction. This inclined plate 7 may be divided into a plurality of pieces instead of one piece. In FIG. 2, the inclined plate 7 is designed so that it does not come into contact with the developer 2 that rotates from below to the upper blade. However, if it were to come into contact with a part of it as shown in FIG. 3, the inclined plate 7 The developer 2 also hits the lower surface of the. At this time, the developer 2 moves in the opposite direction to the direction in which it moves diagonally downward on the upper surface of the inclined plate 7. In other words, the developer 2 moves left and right, so
Stirring is performed more efficiently. This situation is shown in FIG. In this case as well, instead of the inclined plate 7, one or both of the upper and lower sides may have a channel structure, or it may be divided into a plurality of pieces in the axial direction. FIG. 5 shows that another inclined plate is added to the one shown in FIG. 4, and the developer 2 that has hit the lower side of the upper inclined plate 71 and has fallen is removed in the moving direction of the developer as it moves on the upper surface of the inclined plate 71. An inclined plate 72 is provided to guide the force in the opposite direction.

In this case as well, it may be divided into a plurality of pairs. Also,
Even if there is no natural fall effect, the standard E. A similar effect can be obtained by attaching this plate to a location where the developer 2 acts in the opposite direction to the rotating direction of the magnetic roll 5a due to the reaction generated when it hits the magnetic roll 5a. The stirring method of the present invention can also be used in combination with another stirring mechanism.

FIG. 6 shows one example of this, in which an antibody that tends to be convex or concave is provided on the surface of the scraping plate 8 to move the developer laterally, and it is effective if used in combination with the present invention. .

In addition, it may be used in combination with a case in which a diagonal antibody is provided on the side plate of the container 3. As described above, according to the present invention, the developer scraped off by the cutter provided to make the thickness of the developer layer formed on the magnetic roll a predetermined value is removed from the developer layer. Since it is equipped with an inclined plate that uses moving force to move the developer in the axial direction of the magnetic roll, it is possible to move the magnetic roll in the developer container with a simple device without applying excessive force to the developer. can be agitated in the axial direction, extending the life of the developer.
This has the effect of providing a uniform image.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a vertical sectional side view of a stirring device showing one embodiment, FIG. 2 is an enlarged longitudinal sectional side view of the main part thereof, and FIG. FIGS. 4 and 5 are perspective views of essential parts in further embodiments, and FIG. 6 is a plan view showing a modification of the scraping plate. 5...Developing roll, 2...Developer, 6
...Regulation plate, 7... Slanted plate.

Claims (1)

[Claims] 1. A means for attracting a developer consisting of a mixture of magnetic carrier and toner onto a magnetic roll to form a developer layer, and a means for forming a developer layer on the magnetic roll to a predetermined thickness. In an electrophotographic developing device that is equipped with a regulating plate that scrapes off the outer periphery and develops a latent image by rubbing the surface of a recording medium with a developer layer set to a predetermined value, the developer that has been scraped off by the regulating plate is removed from the developer layer. 1. A developer agitation device for an electrophotographic developing device, characterized in that it is provided with an inclined plate that uses moving force to move the magnetic roll in the axial direction.