KR200168261Y1 - Device for grounding static electricity of paper in electrophotographic processor - Google Patents

Abstract

The present invention relates to a recording paper antistatic device of an electrophotographic processor, comprising: installing a metal shield immediately before a fuser composed of a heating roller and a compression roller, connecting a resistance to the metal shield, and grounding the resistor one side terminal It guides paper paths while static electricity is discharged.

Description

Recording paper static eliminator of electrophotographic processor

The present invention relates to an electrophotographic processor, and more particularly, to a laser beam printer, and more particularly, to a recording paper static eliminating device for removing static electricity generated on a recording paper.

An electrophotographic processor generally refers to an apparatus employing an electrophotographic developing method such as a copy machine, a facsimile machine and a laser beam printer. Such an electrophotographic processor is essentially provided with a paper cassette, an image forming means such as a developing means, and a fixing machine to fix the toner on the paper, thereby performing a copying process.

1 is a configuration diagram schematically showing a laser beam printer according to a conventional embodiment. In the drawings, a laser beam printer of the electrophotographic processor will be described as an example. Referring to the drawings,

The conventional laser beam printer is sequentially fed sheet by sheet by the pickup roller 20 in the paper cassette 10 in which a plurality of sheets P are stacked. Then, arriving at the alignment roller 30, the tip of the paper P is aligned, and then the toner is fixed on the paper by high heat and high pressure through the developing device 40 and the fixing unit 50. The paper on which the image is formed is discharged through the discharge roller 60 to the discharge bin.

In a device such as a laser beam printer or a copying machine, which proceeds by using the electrophotographic development method as described above, a static elimination device is installed on the transfer roller 404 to discharge static electricity of the printed paper, or although not shown in the drawing, Brush-shaped static eliminators are used on the other side, and some are not used at all.

If the static electricity of the paper can be properly discharged by installing the antistatic device on the transfer roller as described above, no problem occurs. However, if the static electricity of the paper is not static-discharged, the accumulated static electricity is transferred to the paper. In the meantime, the electric potential is discharged at the lower side. When the high potential is momentarily discharged, electromagnetic radiation noise is generated. Such high-energy noise has a problem far exceeding the noise level of EM standards regulated by each country. These electromagnetic waves often occur to harm the human body.

The present invention has been made to solve the above-described problems, the object of the present invention is to prevent the generation of electromagnetic radiation noise by always having the paper below a certain potential in the image forming apparatus using the electrophotographic development method Provided are an electrostatic antistatic device of a photo processor.

In order to achieve the above objects, the present invention installs a metal shield immediately before the fixing unit composed of a heating roller and a pressing roller, connects a resistance to the metal shield, and grounds the terminal on one side of the resistor to prevent static electricity from the recording paper. It guides the paper path at the same time as static elimination.

1 is a configuration diagram schematically showing a laser beam printer according to a conventional embodiment

Figure 2 is a schematic view showing a laser beam printer according to an embodiment of the present invention

<Explanation of symbols for main parts of drawing>

1: metal shield 40: developer

50: fixing machine 404: transfer roller

501: heating roller

Hereinafter, with reference to the accompanying drawings will be described in detail the most preferred embodiment of the present invention. First, in describing each of the drawings, only the same components have the same reference numerals as much as possible even if shown 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.

Figure 2 is a schematic diagram showing an electrophotographic processor according to an embodiment of the present invention. A laser beam printer of the electrophotographic processor will be described as an example. In the figure, the thick solid line indicates the paper conveyance path. In addition, the arrow of the roller shown in the figure shows the direction of rotation. The antistatic device of the present invention will be described with reference to the drawings.

The static electricity eliminating device of the present invention is installed just before the fixing unit 50. The antistatic device is installed just before passing between the heating roller 501 and the pressing roller 502, which are components of the fixing unit. The antistatic device installs the metal shield 1 to extend in the axial direction, connects a resistor R to the metal shield 1, and grounds the terminal to which the resistor R is connected.

Looking at the configuration and operation of the present invention embodied in such a configuration, in the paper cassette 10 in which a plurality of sheets are loaded, the recording paper P is sequentially transferred from the top sheet to the sheet by the pickup roller 20 and the fingers not shown in the drawing. do. The recording paper P is guided to the alignment roller 30 by the guide frame by friction with the pickup roller 20, and the tip of the paper is aligned by the alignment roller 30, and then the recording paper passes through the developer 40. .

At this time, the developing device 40 rotates with the charging roller 402, the developing roller 403, the transfer roller 404 and the like positioned around the photosensitive drum 401 in the outer circumferential direction. Among these rollers, a high potential voltage is applied to the photosensitive drum 401, the charging roller 402, the transfer roller 404, and the like.

Therefore, in order to discharge the static electricity generated when the toner is transferred while the recording paper passes through the developing device 40, an electrostatic device is installed on the transfer roller 404 to ground the static electricity. The paper passing through the developing device 40 and the transfer roller 404 is guided by a guide frame, and arrives at the second static eliminator. The antistatic device is provided with the metal shield 1 just before the fixing unit 50. The resistor R is connected and the end is grounded to ground the static electricity. The toner is fixed while the recording paper P passes between the heating roller 501 and the pressing roller 502 through the static eliminator.

The paper on which one surface is printed is guided by the guide frame 52 and discharged to the outside by the discharge roller 60. The discharged paper is loaded into the discharge tray.

The primary static eliminating device 410 installed in the transfer roller removes static electricity from the paper when passing between the photosensitive drum 401 and the transfer roller 404, but does not completely static electricity discharge. Subsequently, when the paper having a constant potential in this state passes through contact with a kind of paper path guide made of the metal shield 1, the high potential of the paper is discharged secondarily through the resistance. The discharged paper can be prevented from having a high potential static electricity while passing between the heating roller 501 and the pressing roller 502.

That is, the influence of the high potential on the heating roller 501 or the pressing roller 502 can be minimized. Then, electromagnetic radiation noise can be prevented by the discharge of static electricity of high potential in the paper or the fixing unit. The metal shield also functions as a guide frame for guiding a paper path. In other words, it guides the path of paper.

It is also possible to substitute a barista or zener diode in place of the resistor connected to the metal shield 1 in the antistatic device.

On the other hand, in the detailed description of the present invention has been described with respect to specific embodiments, it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

As described above, the present invention is effective in preventing electrospinning noise caused by static electricity generated on paper in an electrophotographic processor.

Claims (2)

An electrophotographic processor in which a paper feed cassette, a developing unit, a fixing unit, a discharge roller, and the like are sequentially formed to perform a copying process using an electrophotographic developing method, A metal shield is installed immediately before the fixing unit consisting of a heating roller and a pressing roller, and a resistance is connected to the metal shield, and grounding the one terminal of the resistor prevents static electricity of the recording paper and guides the paper path. The recording paper static eliminating device of the electrophotographic processor. 2. The recording paper static eliminator of claim 1, wherein the metal shield is installed to extend in an axial direction.