KR19990038141U - Toner Regulator of Developer - Google Patents

Abstract

The present invention relates to a toner regulating device of a developing device capable of erasing toner adhered to a surface of a developing roller to prevent the same image from being reproduced and obtaining a good image. The toner regulating device of the developing device includes a toner stacking unit for storing toner, a stirrer rotating about an axis installed in the toner stacking unit, a supply roller provided on one side of the toner stacking unit, and a developing roller installed on the other side of the supply roller. A developing device of an electrophotographic processor comprising: a brush roller adjacent to a lower side of the developing roller and axially coupled to supply a uniform toner by removing toner remaining on a surface of the developing roller. The toner regulating device of the developing device can remove the residual amount of toner adhering to the surface of the developing roller to supply uniform new toner on the developing roller, thereby obtaining high quality uniform image quality.

Description

Toner Regulator of Developer

The present invention relates to an image forming apparatus using an electrophotographic processor, and more particularly, to a toner regulating apparatus of a developer capable of obtaining a high quality image by erasing toner adhered to a surface of a developing roller to prevent the same image from being reproduced. .

1 is a schematic diagram showing an operation of a general electrophotographic processor.

Referring to FIG. 1, a process of printing a sheet by an electrophotographic processor according to a general embodiment is as follows.

The toner 6 loaded in the toner loading section 8 of the developing unit moves to the feed roller 3 in a stirred state by the stirrer 4, and the toner 6 rotates as the feed roller 3 rotates. Is transferred to the surface of the developing roller 2. The toner 6a on the surface of the developing roller 2 is regulated in a thin layer by the regulating blade 5 and developed on the surface of the photosensitive drum 1 on which the electrostatic latent image is formed by the charging roller 7 and the exposure part 9. To form a visible image.

On the other hand, the paper 12 loaded in the paper feed cassette 13 is transferred to the feed rollers 14 and 14a by the rotation of the pickup roller 11, and the paper 12 transferred to the feed rollers 14 and 14a. Is inserted between the photosensitive drum 1 and the transfer roller 10 on which the electrostatic latent image is formed. At this time, the toner developed on the photosensitive drum 1 is transferred to the paper surface by the transfer action of the transfer roller 10, and the paper on which the toner is transferred passes between the heat roller 16 and the pressure roller 17, and the image is transferred. Settles down.

Subsequently, the sheet on which the image is fixed is transferred to the discharge rollers 18 and 18a by the transfer rollers 19 and 19a, and is discharged through the discharge port by the rotation of the discharge rollers 18 and 18a. The paper discharged from the paper feeding cassette 13 through the discharge port is guided along the guides 15, 15a, 15b, and 15c provided in place.

2 is a cross-sectional view showing a developing device according to an embodiment of the prior art.

As shown in FIG. 2, the conventional developing device includes a toner stacking unit 26 in which toner 28 is loaded, an agitator 40 rotating around an axis provided in the toner stacking unit 26, and the toner stacking. A supply blade 24 provided below the portion 26, a developing roller 22 provided on one side of the supply roller 24, and a regulating blade provided above the developing roller 22 to regulate the toner in a thin layer. It consists of 20.

On the other hand, the process until the toner loaded in the toner loading unit 26 is transferred to the surface of the developing roller 22 is described as follows.

After supplying the appropriate amount of toner through the toner supply port of the toner stacking portion 26, a thin film is attached to the toner supply port and sealed. Then, as the agitator 40 rotates, not only the toner 28 that has been aggregated is dispersed but also charged due to friction between the toners 28. The tribocharged toner 28 is transferred to the surface of the developing roller 22 by the supply roller 24, and is regulated in a thin layer by the regulating blade 20 as described above. Is developed on the surface of the photosensitive drum 30 on which the electrostatic latent image is formed to form a visible image. At this time, the toner developed on the photosensitive drum 30 is transferred to the surface of the paper 42 by the transfer action with the transfer roller 41.

As described above, toner is continuously supplied to the developing region of the developing roller 22 to make the latent image formed on the surface of the photosensitive drum 30 a visible image. The toner thinned and supplied by the regulating blade 20 moves from the developing roller 22 to the surface of the photosensitive drum 30 in the case of the latent image portion, but in the case of the non-image portion, the toner remains on the surface of the developing roller 22 as it is. It returns to the toner stacking section 26. The toner remaining undeveloped is removed by the supply roller 24 and a new toner must be supplied, but some toner is attached to the surface of the developing roller 22 and resupplyed.

When using the above method, the toner in the undeveloped portion is increased in charge amount compared to the new toner developed due to the increase in the triboelectric charge time. Therefore, the difference in the amount of toner movement from the developing roller to the photosensitive drum is caused by the difference in the charge amount between the image portion and the non-image portion, resulting in a change in image density, which results in a problem in that image quality is different from the actual one.

SUMMARY OF THE INVENTION An object of the present invention is to provide a toner regulating device for a developer capable of supplying new toner to a supply roller by mechanically removing or uniformly dispersing toner that is unevenly present on the surface of the developing roller.

Another object of the present invention is to provide a toner regulating device of a developing device which makes the toner supplied to the developing roller uniform, thereby preventing deterioration of image quality caused by the developing roller cycle.

In order to achieve the above object, the present invention provides a toner stacking unit having toner loaded thereon, an agitator rotating about an axis installed in the toner stacking unit, a feed roller installed at one side of the toner stacking unit, and the other side of the feed roller. A developing device of an electrophotographic processor comprising a developing roller, comprising: a brush roller adjacent to a lower side of the developing roller and axially coupled to remove a toner remaining on a surface of the developing roller to supply a uniform toner; It is characterized by the configuration.

1 is a schematic diagram showing an operation of a general electrophotographic processor.

2 is a cross-sectional view showing a developing device according to an embodiment of the prior art.

3 is a cross-sectional view of a developing device showing the construction of a toner restricting device according to a preferred embodiment of the present invention;

Hereinafter, embodiments 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. And, in describing the present invention, it should be noted that a detailed description of a known function or configuration is omitted in order not to disturb the gist of the present invention.

3 is a cross-sectional view of a developing device showing the construction of a toner regulating device according to a preferred embodiment of the present invention.

Referring to FIG. 3, the toner restricting apparatus of the developer according to the embodiment of the present invention includes a toner stacking unit 52 storing toner, an agitator 50 rotating around an axis installed in the toner stacking unit 52, and And a brush roller (60) in the developing device of the electrophotographic processor including a feed roller (56) installed at one side of the toner stacking portion (52) and a developing roller (58) installed at the other side of the feed roller (56). To configure. The brush roller 60 is adjacent to the lower side of the developing roller 58 and removes the toner remaining on the surface of the developing roller 58 to uniformly supply new toner 54 from the toner loading unit 52. It is installed by shaft coupling. The brush roller 60 is composed of a roller 62, an elastic rubber 64, a brush 66 and the like. The elastic rubber 64 is applied to the surface of the brush roller 60 with a predetermined thickness to add a fixing nip. The elastic rubber 64 is a heat resistant silicone rubber. The brush 66 has a predetermined length from the surface of the elastic rubber 64 and protrudes upward, and a plurality of brushes 66 are attached to remove the toner remaining on the developing roller 58. By varying the material and the arrangement method of the brush 66, a better toner removal effect can be obtained.

Referring to Figure 3 will be described the operation relationship of the toner regulating device of the developer according to an embodiment of the present invention.

First, the toner 54 contained in the toner stacking portion 52 in the toner regulating apparatus of the developing device can be prevented from being solidified by the rotation of the stirrer 50. When the stirrer 50 rotates, the toner 54 in the toner stacking portion 52 rotates in a state where it is buried in the feed roller 56 via the toner supply port by the film attached to both ends of the stirrer 50. It is interlocked and conveyed to the developing roller 58 side. In this process, the toner 54 supplied from the toner stacking portion 52 is rubbed in the nip between the developing roller 58 and the supply roller 56, and is developed by the potential difference between the developing roller 58 and the toner. It is moved to 58. The regulating blade thinens the toner supplied to the developing roller 58 and supplies it to the developing area. The toner frictionally charged in the above process is conveyed to the developing roller 58 by the roughness characteristic of the surface of the developing roller 58 and moved to the photosensitive drum 68. At this time, the toner that is not conveyed to the photosensitive drum 68 and remains on the surface of the developing roller 58 is removed by the brush roller 60 and returned to the toner stacking portion 52 side. The linear velocity of the brush roller 60 is set differently from the linear velocity of the developing roller 58 in order to more easily remove the toner adhered to the surface of the developing roller 58. That is, due to the difference in the rotational speed between the developing roller 58 and the brush roller 60, the friction force is induced to remove the toner. The developing roller 58 is rotated back to the contact with the feed roller 56 while the surface is clean, and performs frictional charging with the toner supplied from the feed roller 56, and the surface of the developing roller 58 The distribution of toner attached to the film becomes uniform. The toner passing through the developing roller 58 is moved to the surface of the photosensitive drum 68 on which the electrostatic latent image is formed by the charging roller 70 and the exposure part 72 to form a visible image. On the other hand, the paper loaded in the paper feed cassette is conveyed to the feed roller by the rotation of the pickup roller, the paper conveyed to the feed roller is inserted between the photosensitive drum 68 and the transfer roller 74, the electrostatic latent image is formed. At this time, the toner developed on the photosensitive drum 68 is transferred to the surface of the paper 76 by the transfer action with the transfer roller 74, and the paper 76 to which the toner is transferred passes through the heat roller and the pressure roller to burn the image. It is settled.

As described above, the toner regulating device of the developing device according to the embodiment of the present invention can remove the remaining amount of toner adhering to the surface of the developing roller to supply uniform new toner on the developing roller, thereby obtaining high quality uniform image quality. It has the effect of being.

Claims (3)

A developing device for an electrophotographic processor comprising a toner stacking unit for storing toner, a stirrer rotating about an axis provided in the toner stacking unit, a supply roller installed on one side of the toner stacking unit, and a developing roller installed on the other side of the supply roller. To And a brush roller adjacent to the lower side of the developing roller, the brush roller being axially coupled to remove the toner remaining on the surface of the developing roller to supply uniform toner. The method of claim 1, wherein the brush roller is applied to the surface of the brush roller having a predetermined thickness to add a fixing nip, the elastic rubber protrudes with a predetermined length from the surface of the elastic rubber and remaining on the developing roller And a toner regulating device including a plurality of brushes for removing toner. The toner control apparatus of claim 1, wherein the linear speed of the brush roller is rotated differently from the linear speed of the developing roller to remove toner adhered to the surface of the developing roller.