KR20000006491U - Pick-up assist device for image forming machine - Google Patents

Abstract

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

The present invention relates to a paper pick-up apparatus of an image forming apparatus, and more particularly, to a pick-up assistance apparatus of an image-forming apparatus provided with an idle roller on one side of a pickup roller to prevent paper folding and paper detachment, which are likely to occur by a finger.

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

SUMMARY OF THE INVENTION An object of the present invention is to provide a pickup assisting apparatus of an image forming apparatus for preventing paper separation and paper folding by a finger.

All. The gist of the solution of the invention.

The present invention is a side feed type image forming apparatus consisting of a main body provided with a pickup roller and a paper feed cassette formed with a finger on an upper end thereof and mounted below the pickup roller of the main body, wherein the upper portion of the paper loaded in the paper feed cassette is provided. One side is characterized in that it comprises an idle roller installed so that both ends are idling about the axis supported by the body.

la. Important uses of the devise.

The present invention is used for an image forming apparatus having a paper feed cassette.

Description

Pick-up assist device for image forming machine

The present invention relates to a paper pick-up apparatus of an image forming apparatus, and more particularly, to a pick-up assistance apparatus of an image-forming apparatus provided with an idle roller on one side of a pickup roller to prevent paper folding and paper detachment, which are likely to occur by a finger.

In general, an image forming apparatus such as a copying machine, a facsimile machine, a laser beam printer, or the like includes a paper feeder for transferring paper loaded in a paper feed cassette into a main body, an image forming machine for forming an image on the paper fed from the paper feeder, and the image. And a fixing unit for fixing the image of the paper on which the image is formed at the forming unit to the paper surface, and a discharge unit for discharging the paper which has been subjected to the fixing process by the fixing unit to the outside of the main body.

The image forming apparatus is divided into a side feeding method where paper is fed from the side of the main body and a center feeding method where paper is fed from the center of the main body according to the feeding method.

1 is a side schematic view showing a paper feed cassette and a pickup roller forming a paper feed unit of an image forming apparatus according to an embodiment of the prior art.

As shown in Fig. 1, the main body of the image forming apparatus is provided with a pickup roller 30 for picking up paper into the main body and a sub knock up plate 15 that supports the bottom of the knock up plate when the paper cassette is mounted.

On the other hand, the paper feed cassette 10 has a knock up plate 12 on which the paper 20 is loaded, a press spring 14 having an upper end supporting the bottom of the knock up plate 12 and a lower end fixed to the base 11 to provide upward pressure, and a paper feed of the paper 20. A finger 16 formed at the upper edge of the paper feed cassette 10 is provided to prevent it.

When the paper feed cassette 10 is mounted on the main body of the image forming apparatus, the end of the sub knock up plate 15 provided on the main body supports the bottom surface of the knock up plate 12 together with the pressure spring 14. Subsequently, when the pickup roller 30 is rotated by a separate driving unit, the pickup roller 30 is loaded on the upper surface of the knockup plate 12 due to the upward force applied by the pressing spring 14 and the sub knockup plate 15 and the friction force between the pickup roller 30 and the paper 20. Paper 20 is picked up inside the main body.

2A and 2B are partial front views showing a conventional paper cassette and pickup roller loaded with a small amount of paper, and FIG. 3 is a partial front view showing a conventional paper cassette and pickup roller loaded with a large amount of paper.

On the other hand, as shown in FIGS. 2A and 2B, when the amount of the paper 20 loaded on the knockup plate 12 is small, the knockup plate 12 suddenly becomes pressed by the pressing force F1 by the pressure spring 14 and the sub knockup plate 15 (FIG. 1). As a result, the paper 20 is released out of the finger 16 even before being picked up by the pickup roller 30.

In addition, as shown in FIG. 3, when the amount of the paper 20 loaded on the knockup plate 12 is large, the pressing force F1 by the pressure spring 14 and the sub knockup plate is concentrated on the finger 16, so that the paper 20 is picked up by the pickup roller 30. There was a problem that the corner portion of the paper 20 in contact with the finger 16 is folded when being picked up.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a pick-up assistance device of an image forming apparatus for preventing paper separation and paper folding by a finger.

In order to achieve the above object, the present invention provides a side feed type image forming apparatus comprising a main body provided with a pickup roller, and a paper feed cassette formed at a lower side of the main body by forming a finger. The upper one side of the paper loaded in the paper feed cassette is characterized in that it comprises an idle roller is installed so that both ends idle about the axis supported by the main body.

1 is a side schematic view showing a paper feed cassette and a pickup roller according to an embodiment of the prior art;

2A and 2B are partial front views showing a conventional paper cassette and pickup roller loaded with a small amount of paper;

3 is a partial front view showing a conventional paper cassette and pickup roller loaded with a large amount of paper;

Figure 4 is a side schematic view showing a main body and a paper feed cassette provided with an idle roller as a pickup aid device according to a preferred embodiment of the present invention,

5A to 5C are partial front views showing a paper feed cassette and a pickup roller of the present invention loaded with a small amount of paper;

6A to 6C are partial front views showing a paper feed cassette and a pickup roller of the present invention loaded with a large amount of paper.

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

10: paper feed cassette 16: finger

30: pickup roller 40: idle roller

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

First, the pickup assisting apparatus of the image forming apparatus according to an embodiment of the present invention is applied to an image forming apparatus of a side feed type, and the pickup assisting apparatus of the image forming apparatus according to another embodiment of the present invention is an image of a center feeding type Applicable to forming equipment.

4 is a side schematic view showing a main body and a paper feed cassette provided with an idle roller as a pickup aiding apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 4, the main body of the image forming apparatus using the side feed method according to the embodiment of the present invention includes a pickup roller 30 for picking up paper into the main body, and a roller shaft 42 having both ends supported on one side of the main body. The idler roller 40 is idling around and the lower end of the outer peripheral surface is installed higher than the rotation radius of the pickup roller 30, and the sub-knock-up plate 15 supporting the bottom of the knock-up plate 12 together with the pressure spring 14 is installed. do.

Idle roller 40 according to an embodiment of the present invention is installed on the upper side of the position where the paper cassette 10 is to be mounted, so that when the pickup of the paper 20 is picked up by the pickup roller 30 to the friction between the idle roller 40 and the paper 20 By this, the skew phenomenon in which the paper 20 is biased and fed to one side can be prevented.

On the other hand, the idle roller 40 of the image forming apparatus using the center feeding method according to another embodiment of the present invention is installed in the upper center of the position where the paper feed cassette 10 is to be mounted, as in the embodiment, the paper 20 by the pickup roller 30 When the pickup is performed, the skew phenomenon in which the paper 20 is biased and fed by one side of the paper by the friction between the idle roller 40 and the paper 20 can be prevented.

5A to 5C are partial front views showing the paper feed cassette and pickup roller of the present invention loaded with a small amount of paper, and FIGS. 6A to 6C show the paper feed cassette and pickup roller of the present invention loaded with a large amount of paper. Partial front view. 5A to 6C illustrate an idle roller according to an embodiment of the present invention, the operation of the idle roller according to another embodiment of the present invention can also be described in the same manner.

Meanwhile, as shown in FIGS. 5A to 5C, when the amount of the paper 20 loaded on the knock-up plate 12 is small enough that there is a space between the top surface of the paper 20 and the finger 16 when the paper is initially loaded, the pressing spring 14 and When the knockup plate 12 is raised by the sub knockup plate 15, first, the lower end of the outer circumferential surface of the idle roller 40 supports the upper surface of the paper 20.

Subsequently, since the lower end of the outer circumferential surface of the idle roller 40 is installed at a position higher than the rotation radius of the pickup roller 30, as the pickup roller 30 rotates, the pickup roller 30 and the paper 20 are mutually rubbed, and the paper 20 is picked up inside the main body. .

That is, the idle roller 40 supports the paper 20 rising by the pressing force F1 provided from the pressure spring 14 and the sub-knock-up plate 15 before the finger 16, so that the paper 20 does not leave the finger 16 without picking up the pick-up roller 30. To be picked up normally.

In addition, as shown in FIGS. 6A to 6C, when the paper is initially loaded, the press spring 14 and the sub-knock-up plate 15 are loaded even when the amount of the paper 20 loaded on the knock-up plate 12 is such that the top surface of the paper 20 contacts the finger 16. When the knock-up plate 12 rises, first, the lower end of the outer circumferential surface of the idle roller 40 supports the upper surface of the paper 20 so that the upper surface of the paper 20 can no longer protrude above the finger 16.

Subsequently, since the lower end of the outer circumferential surface of the idle roller 40 is installed at a position higher than the rotation radius of the pickup roller 30, as the pickup roller 30 rotates, the pickup roller 30 and the paper 20 are rubbed and the paper 20 is picked up inside the main body.

That is, the idler roller 40 stops the paper 20 that is about to pop out over the finger 16 and allows the finger 16 to be placed on the paper 20 by its own weight, so that the paper 20 is not folded by the excessive contact with the finger 16. It can be picked up normally by the pickup roller 30.

As described above, the pickup aiding apparatus of the image forming apparatus according to the embodiment of the present invention, when the paper is picked up from the paper feed cassette into the main body by the pick-up roller, the paper is pulled away from the paper before the paper is folded and the paper is fed. It is effective in preventing misfeeding.

Claims (4)

In a side feed type image forming apparatus comprising a main body provided with a pickup roller, and a paper feed cassette provided with a finger at an upper end thereof and mounted below the pickup roller of the main body, And an idle roller installed at one end of the sheet of paper loaded in the paper feed cassette so that both ends are idling about an axis supported by the main body. The pickup assisting apparatus according to claim 1, wherein the idle roller is installed so that the lower end of the outer circumferential surface is higher than the rotation radius of the pickup roller. In the center feeding method image forming apparatus comprising a main body provided with a pickup roller and a paper feed cassette formed at a lower side of the main body with a finger formed thereon, And an idle roller at both ends thereof idling about an axis supported by the main body at an upper center of the paper loaded in the paper feed cassette. The pickup assisting apparatus of claim 3, wherein the idle roller is installed such that a lower end of the outer circumferential surface is higher than a rotation radius of the pickup roller.