JPS626029Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is removably installed in the main body of the copying machine.
This invention relates to improvements in paper feeding cassettes for automatic paper feeding.

In a copying machine, a cassette containing a large number of copy sheets is attached to the main body of the copying machine, and the sheets are automatically fed one after another from within the cassette. This paper feeding cassette is equipped with several regulating means to ensure that each sheet is fed reliably and stably one by one during automatic paper feeding. 1 and 2 are cross-sectional views of a conventional paper feeding cassette. In the figure, side plates 3 are attached to the bottom of the main body of a cassette 1 for regulating both side edges of the paper 2, and a rear end plate 4 for regulating the rear end of the paper 2 is fixed with screws or the like. Note that the leading edge of the paper is formed by bending the side plate 3 inward, and the leading edge is regulated by this folded part. Further, on both side plates 3, a member _5-1 is rotatably provided with a pin 6 and has a cassette pawl 5 for regulating both corners of the leading edge of sheets and for preventing the feeding of two sheets. Furthermore, a bottom plate 7 is provided at the bottom of the cassette 1 in order to cause the stored paper 2 to face the paper feed roller of the copying machine main body, and as shown in FIG. It's pushing up.
This bottom plate 7 is integrally formed with a rotating body 10 which is rotatably formed on both side plates 3 by a shaft pin 9.

In this configuration, when the paper feed cassette 1 is installed in the copying machine main body, the bottom plate 7 is pushed up by the push-up mechanism 8, as shown in FIG. . A cassette claw 5 is brought into contact with each corner of the leading edge of the paper 2. Therefore, when a paper feed signal is input, a paper feed roller (not shown) is driven to feed the topmost paper. At this time, both corners of the sheet 2 are restrained by the cassette pawl 5, and the sheet 2 is bent, and due to the restoring force of the bent sheet, one sheet of paper is fed over the pawl 5.

Here, unless the cassette 1 is attached to the main body of the copying machine as shown in FIG. 1, the sheets 2 are accommodated in the rear end plate 4 without any gaps. However, as shown in FIG. 2, the bottom plate 7, which is integral with the rotating body 10, is pushed up by the push-up mechanism 8. Along with this,
The stored paper 2 and the cassette claw 5 above it are also pushed up. As a result, a gap A is formed between the leading edge of the paper 2 and the cassette claw 5, and a small gap B is also formed between the rear end of the paper 2 and the rear end plate 4. This gap becomes larger as the amount of paper pushed up increases. When the gap A or B is created, the amount by which the corner of the paper 2 is caught by the claw 5 is reduced.
Therefore, the claw 5 is placed one
It no longer plays the role of sheet feeding, and multiple sheets of paper 2 are fed. Furthermore, the trailing edge cannot be regulated, which may result in unstable paper feeding.

In view of the above-mentioned drawbacks, the present invention provides a new paper feeding cassette that does not create gaps at the leading and trailing ends of the paper in a cassette that has a mechanism that pushes up the paper upwards when the cassette is installed in a copying machine. It is something to do. In other words, in the paper feed cassette of the present invention, when the paper is pushed up by the push-up mechanism, the rear end plate for regulating the rear end is slid in conjunction with the rotation of the rotating body by pushing up the bottom plate to push up the paper. This is a configuration that allows That is, by sliding the rear end plate, the gap that has existed up to now is eliminated.

The present invention will be explained in detail below with reference to the drawings. FIG. 3 is a sectional view showing a specific example of the paper feed cassette according to the present invention. In this paper feed cassette, the same parts as in FIGS. 1 and 2 are indicated by the same reference numerals. In the figure, a rear end plate 11 for regulating the rear end of the sheets of paper 2 is provided at the bottom of the cassette 1 so as to be slidable in the longitudinal direction of the sheets of paper 2. As shown in FIG. Further, the rear end plate 11 is pivotally supported by a shaft 12 and connected to the lower part of the rotating body 10 . That is, the rear end plate 11 is connected to the lower part of the rotating body by being pivotally supported by the shaft 7 at the tip of the integrally formed connecting plate 13. Therefore,
When the rotating body 10 rotates, this rotation is converted into horizontal movement, and the rear end plate 1 is slid in the length direction of the paper via the connecting plate 13.

In the paper feed cassette having the above configuration, when the cassette 1 is installed in the main body of the copying machine, the bottom plate 7 is pushed up by the push-up mechanism 8 as shown in FIG.
The rotating body 10 is rotated around the shaft pin 9. As a result, the rear end plate 11 is moved in the horizontal direction via the connecting plate 13. When the bottom plate 7 is pushed up, the rear end plate 11 moves in the direction of the claw 5 at the tip, and the amount of movement corresponds to the rotation angle of the rotating body 10 (the amount by which the bottom plate 7 is pushed up). For example, the rotating body 10
When the rear end plate 11 is rotated to the position shown by the solid line, the rear end plate 11, which was at the position shown by the two-dot chain line, is moved to the position shown by the solid line. Therefore, the gaps A and B that occurred when the rear end plate 1 was pushed up by the conventional push-up mechanism are
1 is moved toward the leading edge of the paper 2, the gap that occurs is corrected and eliminated. Incidentally, the side plate 3 may also be used as a side plate forming the cassette 1.

As explained above, according to the present invention, in a paper feed cassette that is installed in a copying machine and employs a mechanism for pushing up paper, when the bottom plate rises with the position of the rotating body as a fulcrum, the connecting tool connected at the fulcrum The attached trailing end plate moves in conjunction with the above-mentioned upward movement, thereby eliminating the gap between the leading edge and trailing edge of the paper that occurred when the cassette was installed.
The rear end plate moves automatically when you load the cassette, saving you the trouble of having to move the rear end plate again after loading the cassette.Furthermore, when the remaining amount of stored paper changes, the bottom plate moves automatically. The amount of paper that is pushed up, that is, the rotation angle of the rotating body changes, and the rear end plate moves accordingly, so that there is no gap between the paper and the rear end plate, so that the paper is stored in the cassette body during copying. There is no need to move the rear end plate even when the paper is being used, allowing stable paper feeding.

[Brief explanation of the drawing]

Figures 1 and 2 are cross-sectional views showing a conventional paper feed cassette. Figure 1 shows the steady state function, Figure 2 shows the operating state, and Figure 3 shows the paper feed cassette of the present invention. FIG. 3 is a sectional view showing the cassette. 1: Cassette body, 2: Paper, 3: Side plate, 5:
Cassette pawl, 7: bottom plate, 10: rotating body, 11: rear end plate, 12: shaft, 13: connecting tool.

Claims (1)

[Claims for Utility Model Registration] A cassette body 1 that stores paper, a side plate 3 that regulates both edges of the paper stored in the cassette body 1, and a cassette that rotates around a shaft 9 provided on the side plate 3. A rotary body 10 that is freely rotatable; a bottom plate 7 that is integrally formed with the rotary body 10 and that can rise in a direction that pushes up the paper as the rotary body 10 rotates; In the paper feeding cassette, the rear end plate 11 is provided with a push-up means 8 for setting the paper in a possible state, and a rear end plate 11 for regulating the rear end of the paper stored in the cassette body 1. It has a structure in which the rear end plate 11 and the outer peripheral edge of the rotating body 10 are connected by a connector 13, and the rear end plate 11 slides in conjunction with the upward movement of the bottom plate 7. A paper feeding cassette characterized in that it is designed to