KR19980056525U - Developer of Electrophotographic Processor - Google Patents

Abstract

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

The present invention relates to a developing apparatus capable of removing residual toner remaining on the surface of a developing roller.

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

The present invention can form a high resolution image by removing the residual toner remaining on the surface of the developing roller.

All. The gist of the solution of the invention.

The present invention is a developing apparatus of an electrophotographic processor comprising a supply roller for supplying the toner stirred by a stirrer to the developing roller side, and a developing roller for developing the toner on an electrostatic latent image formed on the surface of the photosensitive drum, wherein the upper portion of the feed roller is provided. And a reset plate for recovering the toner in order to mix the toner remaining on the surface of the developing roller with the toner flowing from the toner loading part after developing the electrostatic latent image of the photosensitive drum into a toner image. do.

la. Important uses of the devise.

The present invention is applied to an image forming apparatus of an electrophotographic processor.

Description

Developing apparatus for an electrophotographic processor.

The present invention relates to a developing device for an electrophotographic processor such as a laser beam printer, a copier, a plain paper facsimile machine, and a multifunction machine. Relates to a developing apparatus.

Typically, a printing apparatus using an electrophotographic developing method has a property of a conductor when irradiated with light, and a photosensitive drum which has a property of an insulator when the light is not irradiated to form a predetermined latent image, and a high voltage is applied to the photosensitive drum. A charging roller of a charging device to be charged and applied, an exposure unit for uniformly charging a predetermined text signal or image signal transmitted from a predetermined computer to a predetermined portion on the photosensitive drum, and exposing electrical energy to light energy; A developing roller for adhering the local fine toner powder charged in a predetermined form on the photosensitive drum; A fixing unit for fixing fine toner on the recording paper, and transferring the recording paper to a predetermined position. Key is made up of a drive unit for driving the paper-feeding unit, and the respective components to each other organically.

Therefore, a general printing process of the developing apparatus of the electrophotographic processor configured as described above will be described with reference to FIG. 1.

First, when the toner 22a is supplied to the toner loading part 20, the toner 22a is agitated by the stirrer 38 to generate static electricity by friction and thus has a constant charge. Thereafter, the stirred toner 22a is conveyed to the supply roller 18 side by the rotation of the stirrer 38. Thereafter, the toner 22a is supplied to the developing roller 14 side by the rotation of the feed roller 18, and the toner 22a formed on the surface of the developing roller 14 is fixed by the regulating blade 16. Is regulated uniformly.

Thereafter, the surface of the photosensitive drum 12 is electrically uniformly (-) polarized by the electrical action of the charging roller 34, and the portion charged by the rotation of the photosensitive drum 12 is exposed to the exposed portion 36. Is exposed to receive an electrical signal for forming an image. At this time, the portion that receives light in the initial charged state forms an electrostatic latent image. Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 12 is developed into a toner image while passing through the developing roller 14 to become a visible image.

Thereafter, the recording paper 30 mounted in the cassette (not shown) is fed to the transfer roller 32 by the pick-up roller, and the recording paper 30 is then subjected to the photosensitive drum 12 by the high pressure action of the transfer roller 32. ) The toner image on the surface is transferred. Thereafter, the recording paper 30 has an image fixed by heat and pressure while passing between the heating roller and the compression roller of the fixing unit (not shown), and is transferred to the pedestal side to achieve desired printing.

In the developing apparatus of the electrophotographic processor configured as described above, the conventional developing apparatus does not have a cleaning apparatus for removing old toner adhering to the surface of the developing roller and mixing the old toner with the new toner together.

That is, a schematic diagram showing a configuration of a developing apparatus of an electrophotographic processor without a reset plate as shown in FIG. 2, wherein the developing apparatus has a negative toner having a negative charge on an electrostatic latent image formed on the surface of the photosensitive drum 12. A developing roller 14 for developing 22a is provided on one side of the photosensitive drum 12, and one side of the developing roller 14 carries the toner 22a uniformly stirred by the stirrer 38. The supply roller 18 which supplies to the 14 side is provided. In addition, at the upper end of the developing roller 14, a regulating blade 16 for uniformly regulating the toner 22a formed on the surface of the developing roller 14 to a constant height is provided in contact with a predetermined pressure.

According to the configuration as described above, the toner 22a introduced from the toner loading part 20 is supplied to the developing roller 14 side by the rotation of the supply roller 18, and formed on the surface of the developing roller 14. The toner 22a is uniformly regulated to a constant height by the regulating blade 16. Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 12 is developed as a toner image while the photosensitive drum 12 is rotated in a clockwise direction while passing through the toner 22a layer formed on the surface of the developing roller 14. Will change to Thereafter, only a part of the toner 22b remaining on the surface of the developing roller 14 is recovered by the rotation of the feed roller 18 in a clockwise direction, and most of the remaining toner 22b is the developing roller 14. ) Will remain on the surface. Thereafter, a printing process is performed as described in FIG. 1.

However, in the developing apparatus of the electrophotographic processor configured as described above, since the photosensitive drum, the regulating blade, and the developing roller are in contact with each other, the toner that is rotating on the surface of the developing roller is fatigued, and thus a large amount of printing or Deterioration of image quality and abnormal images are formed during long-term storage, and after the toner image is formed on the surface of the photosensitive drum, the residual toner remaining on the surface of the developing roller is not removed and is continuously attached. The toner is unevenly charged by the voltage of, and a problem arises in that a high resolution image cannot be formed.

In order to solve the above problems, an object of the present invention is to provide a developing apparatus of an electrophotographic processor capable of forming a high-resolution image by removing residual toner remaining on a surface of a developing roller.

Another object of the present invention is to provide a developing device for an electrophotographic processor that can be mixed with old toner and new toner attached to the surface of a developing roller.

Another object of the present invention is to provide a developing device for an electrophotographic processor capable of always and uniformly charging the toner on the surface of the developing roller.

In order to achieve the above object, the present invention provides a supply roller for supplying the toner stirred by the stirrer to the developing roller, a developing roller for developing the toner on an electrostatic latent image formed on the surface of the photosensitive drum, and An developing apparatus of an electrophotographic processor having a doctor-blade that is uniformly regulated to a certain height, wherein the developing roller has an electrostatic latent image of the photosensitive drum formed into a toner image, and then the toner remaining on the surface of the developing roller is And a reset plate for recovering the toner to be mixed with the toner flowing from the toner loading part.

1 is a schematic view showing the configuration of a developing apparatus of an electrophotographic processor commonly used.

2 is a schematic diagram showing the configuration of a developing apparatus of an electrophotographic processor without a reset plate according to one embodiment of the prior art;

Figure 3 is a schematic diagram showing the configuration of a developing apparatus of an electrophotographic processor with a reset plate for removing the residual toner on the surface of the developing roller according to an embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

10: reset plate 12: photosensitive drum

14: developing roller 16: regulating blade

18: Supply roller 20: Toner loading part

22a, 22b: toner 24: developer-frame

22a indicates toner flowing from the toner loading part.

22b shows the toner remaining after the developing roller develops the toner on the surface of the photosensitive drum.

22c is toner recovered by a reset plate.

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.

3 is a schematic view showing the configuration of a developing apparatus of an electrophotographic processor in which a reset plate for removing residual toner on the surface of a developing roller according to an embodiment of the present invention is installed.

As shown in FIG. 3, the developing apparatus includes a developing roller 14 for developing a negatively charged toner 22a on an electrostatic latent image formed on the surface of the photosensitive drum 12 on one side of the photosensitive drum 12. On one side of the developing roller 14, a supply roller 18 for supplying the toner 22a uniformly stirred by the stirrer 38 to the developing roller 14 side is installed. On one upper surface of the developing roller 14, a regulating blade 16 for uniformly regulating the toner 22a formed on the surface of the developing roller 14 to a predetermined height is installed in contact with a predetermined pressure.

Then, on the top of the supply roller 18, the developing roller 14 develops the electrostatic latent image on the surface of the photosensitive drum 12 into a toner image, and then collects the toner 22b remaining on the surface of the developing roller 14. A toner 22a flowing into the feed roller 18 from the toner loading part 20 and a reset plate 10 mixed with each other are fixedly installed in the developer frame 24. At this time, one end of the reset plate 10 is mixed with the toner 22a after the toner 22c recovered from the developing roller 14 moves on the upper surface of the reset plate 10. The curved surface portion 10a for flowing 22c downward is formed to be rounded at a predetermined angle. In addition, the other end surface of the reset plate 10 maintains a distance of about 2 mm from the surface of the developing roller 14 to recover while scraping the toner 22b remaining on the surface of the developing roller 14, and the lower surface It is installed to maintain a distance of about 2 mm from the surface of the feed roller 18.

According to the configuration as described above, the toner 22a introduced from the toner loading part 20 is supplied to the developing roller 14 side by the rotation of the supply roller 18, and formed on the surface of the developing roller 14. The toner 22a is uniformly regulated to a constant height by the regulating blade 16. Thereafter, the electrostatic latent image formed on the surface of the photosensitive drum 12 is developed as a toner image while the photosensitive drum 12 is rotated in a clockwise direction while passing through the toner 22a layer formed on the surface of the developing roller 14. Will change to

Thereafter, the entire amount of toner 22b remaining on the surface of the developing roller 14 is buried on the end surface of the reset plate 10. Subsequently, most of the toner 22b moves on the upper surface of the reset plate 10 and the remaining toner 22b is recovered to the lower side of the supply roller 18. Thereafter, the toner 22c moved on the upper surface of the reset plate 10 is dropped downward by the curved portion 10a of the reset plate 10 and is discharged from the toner loading portion 20. 22a). Thereafter, the supply roller 18 supplies the toner 22a + 22c mixed with the new toner 22a and the residual toner 22c back to the developing roller 14 side. Thereafter, a printing process is performed as described in FIG. 1.

As described above, the developing apparatus of the electrophotographic processor according to the embodiment of the present invention completely removes the residual toner remaining on the surface of the developing roller, so that the old toner does not exist on the surface of the developing roller. It can be uniformly charged, and also eliminates abnormal images caused by fatigue of the developing roller even when printing for a long time or continuously, and also has the effect of forming a high resolution image.

Claims (4)

A supply roller for supplying the toner stirred by the stirrer to the developing roller, a developing roller for developing the toner on the electrostatic latent surface formed on the surface of the photosensitive drum, and a doctor-blade for uniformly regulating the toner on the surface of the developing roller at a constant height. A developing device for an electrophotographic processor provided, After developing the electrostatic latent image of the photosensitive drum 12 to a toner image, the toner 22b remaining on the surface of the developing roller 14 is introduced from the toner loading part 20 on the supply roller 18. And a reset plate (10) for collecting the toner (22b) to be mixed with the toner (22a) is provided in the developer frame (24). The method of claim 1, wherein one end surface of the reset plate 10 is installed while maintaining a predetermined distance from the developing roller 14 to recover the toner 22b remaining on the surface of the developing roller 14. A developing device for an electrophotographic processor, characterized in that. According to claim 2, wherein one end surface of the reset plate 10 is spaced about 2mm from the developing roller 14, and the lower surface is predetermined in the upper direction while maintaining a distance of 2mm with the feed roller 18 Developing apparatus for an electrophotographic processor, characterized in that installed inclined at an angle of. According to claim 1, wherein the toner 22c recovered from the developing roller 14 is mixed with the toner 22a introduced from the toner loading part 20 at one side of the reset-plate 10. And a curved portion (10a) for rounding the toner (22c) downward.