KR19990039954U - Toner recovery device for electrophotographic processor - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to an image forming apparatus using an electrophotographic method.

I. The technical problem that the invention is trying to solve.

The present invention provides a toner recovery apparatus capable of transferring a toner that is not transferred onto a photosensitive drum in a developing roller toward a fresh toner of a toner loading portion.

All. The gist of the solution of the invention.

The present invention provides a cleaning means on the lower frame of the developing roller to recover toner that is not transferred from the developing roller to the photosensitive drum, and a collecting container for collecting the toner recovered by the cleaning means on the lower side of the developing roller. An auger is rotatably installed by a driving motor to move the collected toner to one side of the collecting container, and is fixed on one side of the collecting container and an upper frame of the toner loading part. A length of the transfer pipe is installed, and a length of a spring having one end fixed to the rotating shaft of the auger is installed in the transfer pipe.

la. Important uses of the devise.

The present invention is applied to the developing roller of the electrophotographic processor.

Description

Toner recovery device for electrophotographic processor

The present invention relates to an image forming apparatus using an electrophotographic method, and in particular, an electrophotographic processor capable of recovering toner loaded on a lower side of a developing roller and discarded without being applied to an electrostatic latent image on a photosensitive drum to a toner loading part of a developing machine. It relates to a toner recovery apparatus.

1 is a block diagram of a general image forming apparatus according to an embodiment of the prior art.

In the conventional image forming apparatus, as shown in FIG. 1, a photosensitive drum 101 rotating at a constant circumferential speed is provided in a frame 102 having a constant shape. Thereafter, in order to charge the photosensitive drum 101 at a high voltage, a charging roller 103 is mounted on one surface of the photosensitive drum 101. In addition, an exposure unit 104 for exposing a predetermined image to the photosensitive drum 101 charged by the charging roller 103 is formed on one side of the photosensitive drum 101. Thereafter, a developing roller 106 is mounted on one side of the photosensitive drum 101 to attach the toner 105 to a portion where the electrostatic latent image is formed by the exposure unit 104 of the photosensitive drum 101. Thereafter, one side of the blade 107 is fixed to the frame 102 in order to form a uniform layer of toner 105 on the surface of the developing roller 106. The other side of the blade 107 is mounted in contact with the developing roller 106. Thereafter, on the other side of the developing roller 106, a supply roller 108 for supplying the toner 105 to the developing roller 106 is provided. In addition, an agitator 109 is provided at one side of the feed roller 108 to agitate the toner to supply the feed roller 108. The feed roller 108 and the stirrer 109 are installed in the toner loading portion 110 in the frame 102. Then, on the lower side of the photosensitive drum 101, a transfer roller 112 for transferring an image onto a sheet of paper is provided on a frame of a main body (not shown).

However, the development roller and the supply roller have a potential difference for supplying the toner. As a result, the toner has energy to move from the supply roller to the developing roller at all times. Is recovered only by At this time, since the toner that is not recovered decreases the amount of charge of the toner and the toner weight per unit area, the toner accumulates under the fresh toner layer supplied by the feed roller, and the amount of toner moved to the photosensitive drum due to uneven toner. There was a problem that causes a change, such as a burn problem.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a toner recovery apparatus of an electrophotographic processor capable of transferring a toner, which is not transferred to an electrostatic latent image of a photosensitive drum, from a developing roller to a fresh toner of a toner loading portion.

In order to achieve the above object, the present invention provides a photosensitive drum for forming an image, a charging roller applying high voltage to the photosensitive drum, a developing roller for supplying toner to the photosensitive drum, and a toner layer of the developing roller. An image forming apparatus of an electrophotographic processor in which a toner loading portion including a blade which is constantly regulated, a supply roller for supplying toner to the developing roller, and an agitator for supplying a large amount of toner to the supply roller, is formed on a predetermined frame. And a cleaning means is installed on the lower frame of the developing roller to recover the toner that is not transferred from the developing roller to the photosensitive drum. A collecting container for collecting the toner recovered by the cleaning means is provided below the developing roller. And to move the collected toner to one side of the collection container. An auger is installed to be rotatable by a drive motor, and a conveying tube having a predetermined length is installed on one side of the collecting container and the upper frame of the toner loading part, and a predetermined length of which one end is fixed to the rotating shaft of the auger in the conveying tube. It is characterized by the installation of the spring.

1 is a block diagram of a general image forming apparatus according to an embodiment of the prior art.

2 is a block diagram of an image forming apparatus according to an embodiment of the present invention.

Figure 3 is a partial cross-sectional view of the toner recovery apparatus according to an embodiment of the present invention.

Figure 4 is a perspective view of a developer equipped with a toner recovery apparatus according to an embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: photosensitive drum 3: charging roller

4: exposure part 6: developing roller

7: Doctor Blade 8: Feed Roller

20: Cleaning Blade 21: Collector

22: Auger 24: transfer pipe

25: spring

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used for the same components, even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

2 is a block diagram of an image forming apparatus according to a preferred embodiment of the present invention, Figure 3 is a partial cross-sectional view of the toner recovery device according to the present invention, Figure 4 is a perspective view of a developing device is installed.

In the image forming apparatus according to the present invention, as shown in Figs. 2 to 4, first, a photosensitive drum 1 rotating at a constant circumferential speed is installed in a frame 2 having a constant shape. Thereafter, in order to charge the photosensitive drum 1 to a high voltage, a charging roller 3 is mounted on one surface of the photosensitive drum 1. In addition, an exposure unit 4 for exposing a constant image to the photosensitive drum 1 charged by the charging roller 3 is formed on one side of the photosensitive drum 1. Thereafter, a developing roller 6 is mounted on one side of the photosensitive drum 1 to attach toner 5 to a portion where the electrostatic latent image is formed by the exposure unit 4 of the photosensitive drum 1.

Thereafter, the blade 7 is fixedly mounted in place of the frame 2 to form a constant toner layer on the surface of the developing roller 6. Thereafter, on the other side of the developing roller 6, a supply roller 8 for supplying toner 5 to the developing roller 6 is provided. In addition, an agitator 9 is provided on one side of the feed roller 8 to stir the toner. The feed roller 8 and the stirrer 9 are installed in the toner loading portion 10 in the frame 2. Then, on the lower side of the photosensitive drum 1, a transfer roller 12 for transferring an image on a sheet of paper is provided on the frame 2 of the main body, not shown.

Thereafter, a cleaning blade 20 is installed on the lower frame of the developing roller 6 to recover the toner 5 which is not transferred to the photosensitive drum 1 from the developing roller 6. One end of the cleaning blade 20 is fixed on the frame 2, and the other end is installed to contact the developing roller 6. That is, the cleaning blade 20 is installed to be at least greater than the pressure of the blade 7 installed to regulate the toner layer of the developing roller 6. Thereafter, a collecting container 21 for collecting the toner recovered by the cleaning blade 20 is formed under the developing roller 6. The collecting barrel 21 is rotatably provided with a screw auger-shaped auger 22 to move the collected toner to one side of the collecting container 21. That is, the auger 22 is installed in the longitudinal direction in the collecting container 21, and the driving motor 23 is installed at one end of the auger. Thereafter, a transfer pipe 24 having a predetermined length is provided on one side of the collecting container 21 and the upper frame of the toner loading part 10. The transfer tube 24 is formed of an elastic material so that it can be easily bent. Thereafter, a spring 25 having a predetermined length is installed in the transfer pipe so that one end thereof is fixed to the rotation shaft 22a of the auger 22. The spring 25 is installed to correspond to the length of the transfer pipe 24.

The operation of the toner recovery apparatus as described above is as follows.

First, the toner 5 loaded in the toner loading part 10 is transferred to the feed roller 8 by the stirrer 9. Thereafter, the transferred toner is adhered to the developing roller 6 by frictional charging of the supply roller 8 and the developing roller 6. Then, the toner 5 attached to the developing roller 6 is regulated to a constant height on the developing roller by the height regulation of the blade 7. On the other hand, after the photosensitive drum 1 is charged to the high voltage by the charging roller 3, the electrostatic latent image is formed by the exposure unit 4. Thereafter, the toner 5 attached to the developing roller 6 is attached to the electrostatic latent image formed on the photosensitive drum 1, and the paper is fed between the photosensitive drum 1 and the transfer roller 12 to form an image.

On the other hand, the toner on the developing roller 6 which is not attached to the electrostatic latent image of the photosensitive drum 1 is collected by the cleaning blade 20 attached to the developing roller, and then collected in the collecting container 21 located below. The toner collected in the collecting container 21 is collected on one side of the collecting container 21 by the rotation of the auger 22 by the driving motor 23. At this time, the spring 25 of the transport tube 24 fixed to the rotation shaft of the auger by the rotation of the auger 22 is also rotated, which is toner collected in one side of the collecting container 21 of the toner loading portion 10 through the transport tube 24 To the fresh toner.

Thereafter, the image formed on the sheet is fixed by the fixing unit (not shown) and discharged to the discharge unit.

As described above, the toner recovery apparatus according to the embodiment of the present invention collects toner, which has not been recovered by the supply roller, and transfers the toner to the toner loading part by the cleaning blade, so that the toner is always supplied with fresh toner, resulting in a high quality image. There is an effect that can be obtained.

Claims (3)

A photosensitive drum for forming an image, a charging roller for applying a high voltage to the photosensitive drum, a developing roller for supplying toner to the photosensitive drum, a blade for constantly regulating the toner layer of the developing roller, and the developing roller. An image forming apparatus of an electrophotographic processor in which a toner loading portion having a supply roller for supplying toner and a stirrer for supplying a large amount of toner to the supply roller is formed on a predetermined frame, A cleaning means is installed on the lower frame of the developing roller to recover toner that has not been transferred from the developing roller to the photosensitive drum; A collecting container is formed below the developing roller to collect toner recovered by the cleaning means; An auger is installed in the collecting container so as to be rotatable by a driving motor to move the collected toner to one side of the collecting container; An electrophotographic processor characterized in that a predetermined length of a transfer pipe is installed on one side of the collection container and an upper frame of the toner loading part, and a spring having a predetermined length fixed to a rotational shaft of the auger is installed in the transfer pipe. Toner recovery device. The method of claim 1, And a blade as the cleaning means. The method of claim 1, The toner recovery apparatus of the electrophotographic processor, characterized in that for the conveying tube using an elastic material.