KR200186325Y1 - Paper pick-up unit for paper cassette - Google Patents

Abstract

The present invention relates to a paper pick-up device of a paper cassette, and the disclosed paper pick-up device includes a paper pick-up device of a paper cassette which provides a paper pick-up force using a compression coil spring, wherein both ends are formed on the side of the paper cassette. A shaft which is installed to be exposed to the user and is manually adjustable; A sub-plate positioned at the bottom of the knock-up plate of the paper feed cassette to support the knock-up plate from below; A connecting body in which a first fastening end and a second fastening end are sequentially provided in a direction perpendicular to the sub-plate; A first elastic body fixed at one side to the first fastening end, the other side being fixed at the shaft to provide a pick-up 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 first long hole formed on the front upper side of the paper feed cassette, and the other end of which rotates so that the user can move along the first long hole; A lever link inserted into one end of the lever and rotating; And a second elastic body, one end of which is fixed to the second fastening end, the other end of which is fixed to the lever link, and wherein the user moves one end of the lever in the first long hole to selectively provide a pickup force of the paper.

Description

Paper pick-up unit of paper cassette {PAPER PICK-UP UNIT FOR PAPER 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 so that a plurality of sheets can be loaded to maintain a pickup position.

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 to the alignment rollers 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.

SUMMARY OF THE INVENTION In order to solve the above technical problem, an object of the present invention is to provide a paper pick-up apparatus of a paper feed cassette capable of responding to a weight difference due to various paper sizes.

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 or more stages.

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

In order to achieve the above objects, the present invention is a paper pick-up device of the paper feeder providing a paper pick-up force by using a compression coil spring, both ends are exposed to the second hole formed on the side of the paper feeder to the user A manually adjustable shaft; A sub-plate positioned at the bottom of the knock-up plate of the paper feed cassette to support the knock-up plate from below; A connecting body in which a first fastening end and a second fastening end are sequentially provided in a direction perpendicular to the sub-plate; A first elastic body fixed at one side to the first fastening end, the other side being fixed at the shaft to provide a pick-up 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 first long hole formed at the front upper side of the paper feed cassette, and the other end of which rotates so that the user can move along the first long hole; A lever link inserted into one end of the lever and rotating; And a second elastic body, one end of which is fixed to the second fastening end, the other end of which is fixed to the lever link, and wherein the user moves one end of the lever in the first long hole to selectively provide a pickup force of the paper.

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

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

Figure 2 is a perspective view showing a paper feed 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 a paper feeding cassette showing a paper pick-up device in which two springs operate according to an embodiment of the present invention;

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

10: knock-up plate 20: subplate

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

80: shaft 90: locker

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. 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. The first tension coil spring 30 is in a tensioned state, and the second tension coil spring 40 is in a state where no force is applied. 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 feed cassette 100 according to the preferred embodiment of the present invention, a paper pick-up device is installed on the front surface 101, and a knock-up plate 150 is installed on the bottom thereof to rotate about one side, and at least one paper width. The adjustment guides 140 and 142 are installed to be movable from side to side. Two curved first and second long holes 110 and 120 are formed up and down in the front one side 102 of the paper feed cassette, and the first long hole 110 located at an upper part of the long hole has one end 601 inserted therein. The second long hole 120 is positioned at one end of the shaft 80 to guide the movement along the second 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 respectively installed on both sides. . In addition, the lever 60 and the lever link 70 is installed only on one side. As described above, a cassette provided with a guide or the like configured to be movable to load various types of paper is referred to as a universal cassette.

When the components of the paper pick-up apparatus installed in the paper feed cassette of the present invention are roughly referred to with reference to FIG. 3, the sub-plate 20 which firstly provides a force so that the knock-up plate 10 exists in the pickup position, and the first elastic body ( 30) and a connecting member 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 connector 50 is integrally formed at a right angle above the sub-plate 20, and the first and second fastening ends are connected to the ends of the connector. (501, 502) are formed sequentially. The first elastic body 30 is most preferably a tension coil spring, the sub-plate 20 or the connector 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 is assembled to the lever 60 to selectively provide a paper pick up force (pick up force) to the knock-up plate 10 according to the user's operation, It consists of a second elastic body 40, etc., both ends of which are fixed to the link 70 and the second fastening end 502. The lever 60 is bent twice in the direction perpendicular to each other, 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, and 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 the above configuration, the lever 60 or the sub plate 20 is in a state capable of rotating in the direction of the arrow (B, C). The lever has one end 602 at the center of rotation, the sub-plate has a hinge axis 503 at the center of rotation, and the shaft 80 is not shown in the drawing, although the second long hole is formed on the side of the paper cassette (see FIG. 2). Shown).

When the paper pick-up device is mounted on the front side of the paper cassette, a part of one end 601 of the lever is exposed, a part of one end 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 first long hole, and the shaft 80 is also selectively moved according to the user's will along the curved second 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 is immovable.

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 simultaneously. It is in a state of providing a pickup force to the knock-up plate (10). 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 FIG. 4, when the paper pick-up device according to the preferred embodiment of the present invention is placed, when the subplate 20 is placed in a horizontal position, the first tension coil spring 30 is connected to the first fastening member. It is in a tensioned state between the stage 501 and the shaft 80. 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 shape of the first long hole 110 is curved, and the distance between the second fastening end 502 of the connecting body and one end 601 of the lever does not change even when the connecting body rotates around the hinge axis 503. Because of this, it does not receive tensile force.

As a result, when one end 601 of the lever is located on one side (a) of the first long hole, the second tensile coil spring 40 does not operate at all, and only the first tensile 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 about the hinge 901, and then the lever When one end 601 of the first long hole 110 is positioned and fixed to the other side, the position of the second fastening end 502 and the one end 601 of the lever is relatively far. Therefore, the second tensile coil spring 40 is extended. That is, it is in a state of receiving tensile force. By moving such a lever along the curved first long hole 110, the operation of the second tension coil spring 40 can be adjusted according to the user's will. At this time, the rocker 90 is in a fixed state by the force of the stopper 130 and the tension coil spring of the lever. In such an operation, the lever link is always maintained toward the second fastening end 502.

As a result, one end of the lever is moved along the first 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. 3 in the second long hole 120. Accordingly, the yarn paper pick-up force can be adjusted by the user as the shaft 80 moves.

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 both ends so as to be exposed to a second long hole formed at a side of the paper feed cassette so that the user can move along the first long hole to manually adjust the pickup force; A sub-plate positioned at the bottom of the knock-up plate of the paper feed cassette to support the knock-up plate from below; A connecting body in which a first fastening end and a second fastening end are sequentially provided in a direction perpendicular to the sub-plate; A first elastic body fixed at one side to the first fastening end, the other side being fixed at the shaft to provide a pick-up 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 first long hole formed on the front upper side of the paper feed cassette, and the user can adjust the paper pick-up force by moving the first end along the first long hole; A lever link inserted into one end of the lever and rotating; And One end is fixed to the second fastening end, the other end is fixed to the lever link, characterized in that the user is composed of a second elastic body for selectively providing a pick-up force of the paper by moving the end of the lever in the first hole Paper pickup of the paper cassette. The paper pick-up apparatus of claim 1, wherein the first and second elastic bodies are tension coil springs. The paper pick-up device of claim 1, wherein the second hole is curved. The locker according to claim 1, further comprising a rocker that rotates about a hinge at an upper side of the second long hole so that one end of the lever is fixed to one side of the second long hole, and the stopper is configured to restrain the rotation of the rocker. A paper pick-up device for a paper feed cassette, characterized by protruding in the vicinity.