KR20070048058A - Paper guiding apparatus for image forming apparatus - Google Patents

Abstract

The paper guide device of the double-sided printable image forming apparatus according to the present invention comprises an upper frame; And a lower frame installed at a lower portion of the upper frame, the lower frame having a paper entry hole and a conveying path, wherein the lower frame has one end connected to the upper frame to guide the paper entering through the paper entry hole during duplex printing. And a paper entry guide portion bent oppositely. Therefore, by using only the upper frame and the lower frame without additionally installing a separate guide member in the paper entry port, the paper can be stably entered through the paper entry port when printing on both sides, thereby reducing the material cost and simplifying the work process and assembly.

Image Forming Device, Duplex Printing, Paper, Jam, Frame

Description

Paper guiding apparatus for image forming apparatus

1 is a perspective view schematically showing a paper guide device of a general double-sided printable image forming apparatus;

FIG. 2 is an enlarged view of a portion 'A' of FIG. 1;

3 is a perspective view schematically showing a paper guide device of a double-sided printable image forming apparatus according to an embodiment of the present invention;

4 is an enlarged view of a portion 'B' of FIG. 3;

5 is a cross-sectional view taken along the line VV of FIG. 4.

<Description of Symbols for Main Parts of Drawings>

100: upper frame 100 ': paper entry opening

200: lower frame 210: paper entry guide portion

230: screw

The present invention relates to a paper guide device of an image forming apparatus capable of printing on both sides.

In general, a double-sided printable image forming apparatus such as a printer or a copying machine includes a paper guide device for guiding a sheet of paper that enters through a paper entry opening during double-sided printing.

1 is a perspective view schematically illustrating a paper guide device of a general double-sided printable image forming apparatus, and FIG. 2 is an enlarged view of a portion 'A' of FIG.

As shown in Fig. 1 and Fig. 2, the paper guide device of the general double-sided printable image forming apparatus is installed in the upper frame 10, the lower portion of the upper frame 10, the paper entry port (10 ') and the entry path And a lower frame 20 having a sidewall and sidewalls (not shown) for aligning the side ends of the paper to be conveyed. The paper entry port 10 ′ is provided with a 'c' shaped paper entry guide member 30. The upper frame 10 includes first and second feeding rollers 11 and 12 that are rotatably installed at an angle. The lower frame 20 includes a feeding roller module (not shown) that is rotatable in close contact with the first and second feeding rollers 11 and 12.

The paper guide device configured as described above is not shown in the drawing, but when the paper exits the first discharge roller at the time of duplex printing, the second discharge roller reversely rotates and enters through the paper entry port 10 '. At this time, since the paper that is rotated in the reverse direction is shaken much from side to side, the paper jams are generated by hitting the side wall. In order to prevent this, a separate paper entry guide member 30 is installed in the paper entry hole 10 'so that the paper entering through the paper entry hole 10' is stably guided and entered to prevent jams from occurring. have. In this way, the paper entering through the paper entry port 11 ′ is conveyed in a state aligned with the sidewall while sequentially passing through the first feeding roller 11 and the second feeding roller 12.

However, in the general paper guide device as described above, when the side wall guiding the side end of the paper is a mold of plastic material, the side wall and the paper entry guide member can be integrally manufactured to reduce the material cost, as well as the work process and assembly. There is a simple advantage. However, since the sidewalls and the paper entry guide member are made of plastic, paper jams occur as the product is deformed due to contact with the paper and its shape is deformed. Therefore, a press of steel sheet is generally used instead of the plastic material.

On the other hand, if the side wall is a press (Steel) of the iron plate material, in order to compensate for this, the paper entry guide member must be installed using a separate member in the paper entrance. This causes a problem of adding materials costs, as well as complicated work process and assembly.

The present invention has been made in view of the above, it is a double-sided printing that can be stably entered through the paper inlet when printing on both sides using the upper frame and the lower frame without having a separate member in the paper inlet It is an object of the present invention to provide a paper guide device of an image forming apparatus.

In order to achieve the above object, the paper guide device of the double-sided printable image forming apparatus according to the present invention includes an upper frame; And a lower frame installed under the upper frame, the lower frame having a paper entry port and a conveying path, wherein the lower frame has one side end connected to the upper frame to guide the paper entering through the paper entry hole when printing on both sides. And a paper entry guide portion bent oppositely.

Here, the paper entry guide portion is preferably the upper end is in close contact with the bottom of the upper frame.

In addition, the upper frame and the lower frame is preferably extended as the distance between them toward the paper entry port side.

In addition, the upper frame and the lower frame preferably has a curved surface of a predetermined curvature.

      The above objects and other features of the present invention will become more apparent by describing the preferred embodiments of the present invention in detail with reference to the accompanying drawings. For reference, in the following description of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a perspective view schematically illustrating a paper guide device of a double-sided printable image forming apparatus according to an embodiment of the present invention, FIG. 4 is an enlarged view of a portion 'B' of FIG. 3, and FIG. 5 is of FIG. 4. It is sectional drawing along the VV line.

      3 to 5, the paper guide device of the double-sided printable image forming apparatus according to an embodiment of the present invention includes an upper frame 100, a lower frame 200 and the like.

The upper frame 100 includes first and second feeding rollers 110 and 120 installed to be rotatable at an angle.

The lower frame 200 is installed below the upper frame 100, and includes a paper entry hole 100 ′ and a transfer path. The lower frame 200 includes a feeding roller module (not shown) that is in close contact with the first and second feeding rollers 110 and 120 to be rotatable. Since the first and second feeding rollers 110 and 120 and the feeding roller module can be understood by a known technique, a detailed description thereof will be omitted. The lower frame 200 includes a paper entry guide 210 having one end bent against the upper frame 100 so as to guide the paper entering through the paper entry hole 100 ′ when duplex printing. The lower frame 200 is made of an iron plate, and the sheet entering guide portion 210 is bent and integrally formed on the lower frame 200 by using press working.

The upper frame 100 and the lower frame 200 are fixed by the screw 230, and preferably screwed so that the upper end of the paper entry guide portion 210 is in close contact with the bottom of the upper frame 100. A left side or a right side between the upper frame 100 and the lower frame 200 is provided with sidewalls (not shown) for aligning side ends of the paper to be conveyed along the conveying path. As shown in FIG. 5, the upper frame 100 and the lower frame 200 extend as the gap between them extends toward the paper entry port 100 ′, and each of the upper frame 100 and the lower frame 200 has a curved surface having a predetermined curvature.

Although the paper guide device of the double-sided printable image forming apparatus according to the exemplary embodiment of the present invention configured as described above is not shown in the drawing, the second discharge roller is reversed at a certain time when the paper leaves the first discharge roller during double-sided printing. It rotates and enters through the paper entry port 100 '. The paper entering through the paper entry hole 100 ′ is stably entered while being guided by the paper entry guide part 210 integrally formed at one end of the lower frame 200. The paper entry guide portion 210 is made of a durable iron plate material, it is possible to prevent the wear of the product due to contact with the paper. The paper entry guide part 210 is in close contact with the bottom surface of the upper frame 100, so that the paper entering through the paper entry hole 100 ′ is transported without being caught between the sides of the upper frame 100 and the lower frame 200. do. The upper frame 100 and the lower frame 200 extends as much as possible between the gaps between the upper frame 100 and the paper entry port 100 ′, and smoothly enter the paper by having a curved surface with a predetermined curvature. The paper that is stably entered through the paper entry port 100 ′ is transported in a state aligned with the sidewall while sequentially passing through the first feeding roller 110 and the second feeding roller 120.

Therefore, the present invention uses the upper frame 100 and the lower frame 200, and by providing the paper entry guide portion 210 integrally on the lower frame 200, the paper does not occur when duplex printing without paper jams The paper entry port 100 'is stably entered. That is, the present invention, unlike the prior art, by not additionally installing a separate guide member in the paper entry port (100 '), reducing the material cost, as well as the work process and assembly is simple.

The present invention has been described above by way of example. The terminology used herein is for the purpose of description and should not be regarded as limiting. Many modifications and variations of the present invention are possible in light of the above teachings. Accordingly, the invention may be freely practiced within the scope of the claims unless otherwise stated.

According to the present invention as described above, by using only the upper frame and the lower frame without additional guide member installed in the paper entry port so that the paper can be stably entered through the paper entry port when printing on both sides by reducing the material cost Of course, the work process and assembly is simple.

Claims (4)

Upper frame; And A lower frame installed at a lower portion of the upper frame and having a paper entry port and a conveying path; And the lower frame has a paper entry guide portion having one end bent to face the upper frame so as to guide the paper entering through the paper entry hole when duplex printing. The method of claim 1, The paper guide device of the image forming apparatus, characterized in that the upper end is in close contact with the bottom surface of the upper frame. The method according to claim 1 or 2, The distance between the upper frame and the lower frame is extended to the paper entrance port side, the paper guide device of the image forming apparatus. The method of claim 3, wherein And the upper frame and the lower frame have curved surfaces of a predetermined curvature.

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