KR19990014690U - Paper Pick-up Device of Paper Feed Cassette - Google Patents

Abstract

The present invention relates to a paper pick-up device for a paper cassette, the shaft being installed on the front and lower side of the paper cassette so that both ends thereof are exposed to the long hole formed on the side of the paper cassette, the user adjustable adjustable installation; A subplate positioned to support the bottom of the knockup plate of the paper feed cassette; A connecting body in which the first fastening end and the second fastening end are sequentially provided in a direction perpendicular to the subblend; A first elastic body having one side fixed to the first fastening end and the other side fixed to the shaft to provide a pickup force of the paper at all times so that the subplate rotates about a hinge axis; A lever installed in the same direction as the shaft so that one end is exposed to the long hole formed in the front upper side of the paper feed cassette and the other end is rotated so as to allow the user to move the lever along the long hole; A lever link inserted into one end of the lever and rotating; And a second elastic body having one end fixed to the second fastening end and the other end fixed to the lever link so that the user selectively moves the lever end in the long hole to selectively provide a pick-up force of the paper.

Description

Paper Pick-up Device of Paper Feed Cassette

The present invention relates to a paper feed cassette of a laser beam printer (LBP) using an electrophotographic development method, and more particularly, to a paper pick-up apparatus installed to maintain a pickup position by loading a plurality of sheets of paper.

In general, an apparatus using an electrophotographic development method refers to a printer, a copier, a copyer, a laser beam printer, and a facsimile. Such a device is essentially equipped with a paper feed cassette in which a plurality of sheets are loaded, and the paper feed cassette is provided with a paper pick-up apparatus for maintaining the pick-up position of a plurality of sheets loaded at all times.

This paper pickup apparatus of the prior art is shown in FIG. The figure illustrates by way of example a laser beam printer in a device using an electrophotographic development method. Referring to the drawings,

The paper cassette 300 shown in the drawing is a universal cassette provided with one or more guides 320 and 322 for adjusting the paper width, and may correspond to various paper sizes. The paper feed cassette 300 is a place where a plurality of sheets are loaded, and is loaded on the paper support 310 which is supported by the compression coil spring 330. The compression coil spring 330 always holds the paper support (knock-up plate), thereby providing a force for the paper loaded on the paper support to be in the pickup position. The paper on the paper support 310 is conveyed toward the alignment roller one by one by a pickup roller and a finger not shown in the drawing. The uppermost sheet and the pickup roller remain in contact with each other, and the sheet is advanced by the rotation of the pickup roller by the frictional force between the uppermost sheet and the pickup roller.

In the above configuration, various sheets of paper are fed into the paper feeding cassette on which the sheets are stacked. Therefore, plain paper, letter paper, transparencies, and the like are used as the recording means. In addition, the general paper is a paper of various sizes and thicknesses are used.

However, the weight difference of the general paper is severe depending on the size and thickness, and the weight difference is more severe if letter paper or OHP film is included. Therefore, in the structure in which one or two compression coil springs are mounted on the lower side of the paper support to determine the pickup position of the paper, there is a problem that the weight difference of various papers cannot be coped with. Significant force differences occur in laser beam printers with a maximum of 500 sheets or more. For example, when using A4 paper and A6 paper, etc., the weight difference of the paper loaded on the paper support is very severe.

As a result of this, there is a problem in that the reliability of paper feeding due to the difference in pick-up force is lowered. As a result of this, there have often been cases where the size of the paper is limited.

The present invention has been made to solve the above-described problems, the object of the present invention is to provide a paper pick-up device of the paper cassette that can cope with the weight difference by the size of various paper.

Another object of the present invention is to provide a paper pick-up device of a paper cassette capable of adjusting the pickup force of the paper in two stages.

Still another object of the present invention is to provide a paper pick-up apparatus of a paper cassette, in which a user can adjust the pick-up force of paper by a simple operation.

In order to achieve the above objects, the present invention is provided in the front and lower side of the paper feed cassette is installed so that both ends thereof are exposed to the long hole formed on the side of the paper feed cassette, the user adjustable adjustable installation; A subplate positioned to support the bottom of the knockup plate of the paper feed cassette; A connecting body in which the first fastening end and the second fastening end are sequentially provided in a direction perpendicular to the subblend; A first elastic body having one side fixed to the first fastening end and the other side fixed to the shaft to provide a pickup force of the paper at all times so that the subplate rotates about a hinge axis; A lever installed in the same direction as the shaft so that one end is exposed to the long hole formed in the front upper side of the paper feed cassette and the other end is rotated so as to allow the user to move the lever along the long hole; A lever link inserted into one end of the lever and rotating; And a second elastic body having one end fixed to the second fastening end and the other end fixed to the lever link so that the user selectively moves the lever end in the long hole to selectively provide a pick-up force of the paper.

Furthermore, a rocker that rotates about a hinge is installed on the upper side of the long hole so that one end of the lever is fixed to one side of the long hole, and the stopper protrudes near the long hole to restrain the rotation of the rocker. In addition, the elastic body is most preferably a tension coil spring, the long hole is most preferably formed in a curved shape.

1 is a perspective view showing a paper feed cassette according to a conventional embodiment

Figure 2 is a perspective view showing a paper cassette according to an embodiment of the present invention

Figure 3 is a perspective view showing the configuration of a paper pickup device according to an embodiment of the present invention

Figure 4 is a partial side view of the paper feeding cassette showing a paper pick-up device with one spring acts according to an embodiment of the present invention

5 is a partial side view of the paper feeding cassette showing a paper pick-up device in which two springs operate according to an embodiment of the present invention;

<Description of Symbols for Main Parts of Drawings>

10: knock-up plate 20: subplate

30, 40: 1st and 2nd tension coil spring 60: lever

80: shaft 90: locker

110,120: 1st and 2nd chapter 130: Stopper

503: hinge shaft

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.

2 is a perspective view showing a paper cassette according to a preferred embodiment of the present invention, Figure 3 is a perspective view showing a paper pickup device of the paper cassette according to a preferred embodiment of the present invention. Referring to the drawings,

In this drawing, a paper feed cassette used for a laser beam printer will be described as an example. In Fig. 2, a paper pick-up device is built in the front side 101 of the paper feed cassette. In Fig. 3, only one side of the paper pick-up device is shown. In the paper pick-up device of Fig. 3, a plurality of sheets are loaded. The first tension coil spring 30 is in a tensioned state, and the second tension coil spring 40 is not in force at all. In this case, a plurality of sheets of paper stacked are omitted in the drawing. In addition, the paper feed cassette 100 of the present invention is a universal cassette provided with at least one guide capable of loading various sizes of paper.

In the paper cassette 100 according to the preferred embodiment of the present invention, a paper pickup device is installed on the front surface 101, a knock-up plate 150 rotating around one side is installed on the bottom, and at least one paper width adjustment guide 140 or 142 is left or right. It is installed to be movable. Two curved long holes 110 and 120 are formed up and down on the front one side 102 of the paper feed cassette. Position and guide the movement along the long hole. In the paper pick-up apparatus shown in FIG. 3, the subplate 20 and the second tension coil spring 40 are installed on only one side, and the connecting body 50 and the first tension coil spring 30 are installed on both sides, respectively. In addition, the lever 60 and the lever link 70 is installed on only one side. As described above, a cassette provided with a guide or the like for loading various types of paper is called a universal cassette.

When the components of the paper pickup apparatus installed in the paper feed cassette of the present invention are roughly referred to with reference to FIG.

The subplate 20 is configured to provide a force for the knock-up plate 10 to be present at the pickup position, and the first elastic body 30 and the connecting body 50 connecting the sub plate 20 and the first elastic body 30 to each other. The sub-plate 20 is located on the bottom of the knock-up plate 10, the connecting body 50 is integrally formed at right angles to the sub-plate 20, and the first and second fastening ends 501 and 502 are sequentially formed at the ends of the connecting body. The first elastic body 30 is most preferably a tension coil spring, and the subplate 20 or the connecting body 50 is most preferably a metal material. In addition, one end of the first tension coil spring 30 is fixed to the first fastening end 501, the other end thereof is fixed to the shaft 80.

In addition, the lever 60, the lever link 70 assembled to the lever 60, the link 70 and the second fastening so as to selectively provide a paper pick up force to the knock-up plate 10 according to a user's operation. It consists of a 2nd elastic body 40 etc. which both ends were fixed to stage 502. The lever 60 is bent twice in a right direction, and both ends are cylindrical. One end 601 of the lever is inserted into the long hole of the paper feed cassette and exposed, and the other end 602 of the lever is rotatable with a rotational center. One side of the second elastic body 40 is fixed to the second fastening end 502, the other side thereof is fixed to the lever link 70. At this time, the lever link 70 is inserted into one end of the lever 60 is rotatable 360 °. In addition, the second elastic body 40 is most preferably a tension coil spring.

In the above configuration, the paper pick-up force applied to the knock-up plate 10 is selectively operated according to the user's will, thereby providing the paper pick-up force in two stages.

In this configuration, the lever 60 or the sub-plate 20 is in a state capable of rotating in the direction of the arrow (B, C). In addition, the lever has a center of rotation at one end 602, the center of rotation of the hinge shaft 503, and the shaft 80 is moved according to the long hole formed on the side of the paper cassette, although not shown in the figure.

When the paper pick-up device is mounted on the front side of the paper feed cassette, one end portion 601 of the lever is exposed, one end portion of the shaft 80 is exposed, and the hinge shaft 503 is also exposed. That is, the exposed portion is visible from the user's point of view, and is exposed to the outside from the side of the paper feed cassette. At this time, the exposed portion is a state that can be operated according to the user's will. One end 601 of the lever is selectively movable according to the user's will along the curved long hole, and the shaft 80 is selectively moved according to the user's will along the curved long hole. On the other hand, the hinge shaft 503 is fixed to a hole formed in the lower side of the paper feed cassette and cannot be moved.

The operation of the paper pick-up apparatus which can be adjusted in two stages according to the user's selection according to the above configuration will be described with reference to FIGS. 4 and 5.

4 is a state in which only the first tension coil spring 30 is operated to provide a pick-up force to the knock-up plate 10, and FIG. 5 shows that the first tension coil spring 30 and the second tension coil spring 40 operate simultaneously to pick up the knock-up plate 10. It is a state that provides. That is, the number of sheets of paper loaded is small in the state of FIG. 4, and the weight of the sheets is large, and FIG. 5 has a large number of sheets of paper.

First, referring to Figure 4, the paper pickup device according to a preferred embodiment of the present invention,

When the subplate 20 is placed in the horizontal position, the first tension coil spring 30 is tensioned between the first fastening end 501 and the shaft 80 of the connecting body. This force means the force to move the knockup plate 10 to the pickup position. Therefore, the uppermost sheet loaded on the knockup plate is in intimate contact with the pickup roller not shown in the drawing, and is fed according to the rotation of the pickup roller.

On the other hand, the second tension coil spring 40 maintains its original state. It is not in tension. The long hole 110 is curved, and even though the connector rotates about the hinge axis 503, the distance between the second fastening end 502 of the connector and the one end 601 of the lever does not change, and thus is not subjected to a tensile force.

As a result, once the end 601 of the lever is located on one side (a) of the long hole, the second tension coil spring 40 does not operate at all, and only the first tension coil spring operates as a pickup force.

As shown in FIG. 5, when the paper is loaded to the paper cassette 100 to the maximum and the weight is close to the maximum, the user arbitrarily rotates the rocker 90 around the hinge 901, and then opens one end 601 of the lever 110. If the position is fixed to the other side (b) of the, the position of the second fastening end 502 and one end 601 of the lever is relatively far. Therefore, the second tension coil spring 40 is extended. That is, it is in a state of receiving tensile force. By moving the lever along the curved long hole 110, it is possible to adjust the operation of the second tension coil spring 40 according to the user's will.

At this time, the rocker 90 is fixed by the force of the tension coil spring of the stopper 130 and the lever. In such an operation, the lever link is always in a state toward the second engagement end 502.

As a result, one end of the lever is moved along the long hole, so that the distance between the second fastening end and the lever is changed so that the second tension coil spring can be operated by the user.

In addition, the shaft 80 is selectively positioned near c or d by moving in the direction of the arrow shown in FIG. Therefore, the user can adjust the yarn paper pick-up force according to the movement of the shaft 80.

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 provides a two-stage difference in the paper pick-up force caused by the difference in weight according to the various paper sizes and the amount of paper loaded in the paper cassette loaded with various sizes of laser beam printers. It can be operated by the user, thereby improving paper feeding reliability.

Claims (4)

In the paper pick-up device of the paper feeder providing a paper pick-up force by using a compression coil spring, A shaft installed at the front lower side of the paper feed cassette so that both ends thereof are exposed to the long hole formed on the side of the paper feed cassette, and the user adjustable to install the shaft; A subplate positioned to support the bottom of the knockup plate of the paper feed cassette; A connecting body in which the first fastening end and the second fastening end are sequentially provided in a direction perpendicular to the subblend; A first elastic body having one side fixed to the first fastening end and the other side fixed to the shaft to provide a pickup force of the paper at all times so that the subplate rotates about a hinge axis; A lever installed in the same direction as the shaft so that one end is exposed to the long hole formed in the front upper side of the paper feed cassette and the other end is rotated so as to allow the user to move the lever along the long hole; A lever link inserted into one end of the lever and rotating; And One end is fixed to the second fastening end, and the other end is fixed to the lever link, and the user is configured of a second elastic body that selectively provides pick-up force of the paper by moving one end of the lever in the hole. Paper pickup device. The paper pick-up device of claim 1, wherein the first and second elastic bodies are tension coil springs. The paper pick-up device of claim 1, wherein the long hole is curved. According to claim 1, wherein one end of the lever is fixed to one side of the long hole is installed on the upper side of the long hole around the hinge, and the stopper protrudes in the vicinity of the long hole to restrain the rotation of the rocker Paper pick-up device for feed cassette.