JPS58109332A - Paper feed cassette device - Google Patents

Abstract

PURPOSE:To increase an accommodated quantity of paper and improve performance of paper feed in a cassette device for a copying machine or the like, by providing a mounting bed urged in the direction to forcibly contact the paper always to a paper feed roller and roller type separating mechanism in front of the paper feed roller. CONSTITUTION:A cartridge stored with a large quantity of paper is placed on a mounting bed 13 of a cassette device 5 mounted to a paper feed unit of a copying machine and set by inserting the uppermost paper under a paper feed roller 16. In this way, the bed 13 is pulled upward through a spring 19, wire 20 and pulley 18, and the uppermost paper is adapted to the roller 16. Under this condition, if rollers 16, 23 are started, the paper fed by the roller 16 is separated by the roller 23 and a roller 25 located at a face-to-face position to the roller 23. Then a paper detector switch 29 is operated to stop the rollers 16, 23 and drive a paper feed roller 3 then feed the paper into a copying machine main unit. In this way, an accommodated quantity of paper can be increased and paper feed accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette device that stores a large number of sheets and feeds the stored sheets one by one, and particularly to a paper feeding cassette device that can store a large amount of sheets.

BACKGROUND OF THE INVENTION Currently, a cassette device that stores a large number of sheets of paper and is detachably installed in the main body of the device is widely used as a paper feeding section used in copying machines and the like. This cassette device had a structure in which the stored sheets were opposed to a paper feed roller on the side of the main body of the copying machine. Therefore, according to this cassette device, the number of sheets of normal paper that can be accommodated is approximately 200 to 250 sheets. However, in today's world where high-speed copying machines have become widespread and the number of copies made has increased significantly, it is not uncommon for a large number of copies to be made at one time. In that case, with the conventional Ω, which uses a cassette device that holds about 200 to 250 sheets of paper, it takes a lot of time to attach and detach the cassette device and load the paper, and it becomes complicated, making the operability very difficult. I was making it worse.

In order to solve this problem, a multi-sheet cassette device capable of storing a large amount of paper at once has been considered. If only the space in the paper accommodating section is made larger and the rest of the structure is the same as that of a conventional cassette device, the paper may not be fed out correctly one by one. Conventional cassette devices generally feed the paper stored in the cassette device one sheet at a time, so that at least the surface of the paper in the uppermost position is conveyed to the paper feed roller attached to the copying machine body. At times, the paper was pushed up from the bottom of the device by means of a biasing means such as a spring so as to come into pressure contact. If this mechanism is applied to a cassette device that accommodates a large amount of paper, there will be a large difference in the action of the biasing means for a large amount of paper and for a small amount of paper. As a result, the pressure force between the paper feed roller and the surface of the paper at the uppermost position is not constant, leading to paper feeding errors such as feeding two sheets of paper.

In order to solve the above-mentioned drawbacks, there are some machines in which the paper stack is raised according to the number of sheets used using an elevator mechanism, without using a biasing means such as a spring to raise the paper stack. . According to this, the pressure contact force between the paper at the uppermost position and the paper feed roller is always constant, making it possible to prevent paper feeding errors. However, if the above elevator mechanism is used in a cassette device that is detachably installed in the main body of a copying machine, the cassette device itself becomes a major loss and becomes quite heavy, making it impossible to attach it to the main body of the copying machine.

Moreover, the elevator mechanism is not only complicated but also expensive.

Furthermore, if a cassette device that accommodates a large amount of paper is attached to the main body of the copying machine as is, it will not be possible to mount a normal cassette device that accommodates about 20 to 25Q sheets. Moreover, it becomes necessary to design the space of the paper feed section on the copying machine main body side into which the cassette is installed to be large according to the cassette device, and it becomes impossible to contribute to miniaturization of the copying machine.

In view of the above-mentioned drawbacks, the present invention has developed a paper feeding duck 1. which can accommodate a large amount of paper and which prevents paper feeding errors such as double-sheet feeding.
The present invention provides a device for Another object of the present invention is to provide a device that prevents the above-mentioned two-sheet feeding while having a simple structure of the cassette device itself. Furthermore, the present invention provides a cassette device that can be used in copying machines that are normally equipped with a cassette.

The paper feeding cassette device of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing a specific example of the cassette device according to the present invention, FIG. 2 is a sectional view showing the cassette device installed in the main body of a copying machine, and FIG. 3 is a perspective view showing a cartridge containing paper. It is. In the figure, 1 is the main body of the copying machine, 2 is the paper feed section where the spool and gutter device can be attached and removed, 3 is the paper feed roller provided on the main body side facing the paper feed section, and 4 is the paper feed roller that feeds the paper. This is a guide that guides the fed paper to the zeta copying process. The paper feed section 2 has a structure in which not only a normal cassette device can be attached and detached, but also a cassette device 5 according to the present invention which can accommodate a large amount of paper.

Next, the structure of the cassette device 5 will be explained.

The cassette device 5 has a tip end that is the same size as a normal cassette, and has a structure that is attached to the paper feed section 2 of the copying machine main body.The cassette device 5 has a space part surrounded by a large amount in a part that protrudes from the copying machine main body l. be done. A lid 8 is attached to the cassette bottom plate 6 via a hinge 9 to open a space for storing sheets. The paper 10 is not stored as is in the cassette device 5, but is stored in a cartridge 11 with an open end as shown in FIG. A stopper 15 is attached to the rear end of the mounting table 13 to prevent the cartridge 11 from sliding down and to regulate the mounting position of the cartridge 11.

A first paper feed roller 16 is provided at the top of the cassette device 5, facing the tip of the placement table I3, particularly near the tip of the paper IQ placed thereon.

The first paper feed loaf-16 is fixed to a first rotating shaft 17 which is rotatably supported by both frames 7, and the paper feed roller 16 sequentially feeds paper from the uppermost paper 1o of q. It is. or,
The paper feed roller 16 is made of a material such as rubber, which has a high coefficient of friction so that the friction with the paper 10 is greater than the friction between the paper sheets 1o. Both ends of the first rotating shaft 17 are provided with a boot 8 rotatably relative to the shaft 17.
is provided. A wire 2o, which has one end fixed to the connecting member 14 and the other end fixed to both frames 7 via a thread ring 19, is stretched over the pulley 18. In other words, the loading table 13 is always urged upward by each spring 19, and the paper stored in the container 11]
The top of the sheet O is always pressed against the first paper feed roller 16.

Paper 1 is fed by the rotation of the first paper feed roller 16
0 is guided to the second paper feed roller 23 through a conveyance path between the upper and lower guide plates 21 and 22. Information board 21.22
are fixed to the frame 7 at both ends, the leading end faces the first paper feed roller 16, and the rear end extends to the second paper feed roller 23. In addition, the second paper feed roller 23
is a second rotating shaft 2 rotatably supported between frames 7.
Paper 10 is fixed to the center of paper 4 and guided.
The paper is fed to the paper feed roller 3 of the copying machine main body @11. An opposing roller 25 is provided that faces the second paper feed roller 23 at a constant interval. The opposing roller 25 is fixed to a shaft 26 rotatably provided between the frames 7 to prevent double feeding.

Said second paper feed row 5-231 U a'-”'5-2
．． It is made of a member such as rubber so that the friction between the sheets 10 and 10 is greater than the friction between the sheets 10.

The paper 10 that has passed between the second paper feed roller 23 and the opposing roller 25 is guided along a transport path between the upper and lower guide plates 27 and 28 that face each roller. The upper guide plate 27 extends to the front of the paper feed roller 3, and the lower guide plate 28 extends to a position facing the paper feed roller 3 and the guide 4 that guides the paper to the copying process. The guide plate 28 is held by a biasing means such as a spring (not shown), and is normally regulated to the height shown in FIG. In other words, it is pressed downward by the rotation of the opposing paper feed roller 3, and a suitable pressure contact force is always applied between the paper feed roller 3 and the surface of the roller 3, thereby exerting a good feeding force. Corresponding to the position of the paper feed roller 3, the paper 1o
An operating piece 29 - 1 of the detection switch 29 that detects the movement of the object protrudes from the opening 28 - 1 of the guide plate 28 . The detection switch 29 is attached to the bottom plate 6-1 on the back side of the guide plate 28 via a fitting (not shown) or the like.

On the other hand, the first rotating shaft 17 extends from one frame 7, and a driving sprocket 31 is attached to its end via a one-way rotation latch 3o. This one-way rotation clutch 30 is a clutch that transmits the rotational force to the first rotating shaft 17 when the sprocket 31 rotates in the direction of the arrow, and does not transmit rotational force when the sprocket 31 rotates in the opposite direction. be. In other words, the first paper feed roller 16
If it rotates in the clockwise direction opposite to the direction of the arrow, it will idle and its rotational force will not be transmitted to the sprocket 31.

A drive motor 32 for driving the first paper feed roller 16 is provided on the frame 7 on which the sprocket 81 is located. A sprocket 33 for transmitting driving force is fixed to the rotating shaft of this driving motor 32. Further, like the first rotation shaft 17, the second rotation shaft 24 is also connected to the frame 7.
A sprocket 34 is fixed to the tip of the sprocket 34. A first chain 36 for transmitting driving force is provided between this sprocket 34 and the sprocket 33 via a sprocket 35. ing.

The sprocket 35 is rotatably held by the frame 7 and is a sprocket for the tension 3 of the first chain 36. Furthermore, the second rotating shaft 24 includes a first rotating shaft 1.
A sprocket 37 corresponding to the sprocket 81 of No. 7 is fixed, and this sprocket 37 and sprocket 3
1 and a second chain 38 is passed between the two. or,
A transmission gear 39 is attached to the second rotating shaft 24 . This gear 39 is provided to rotate the opposing roller 25, and meshes with a gear 41 fixed to the protruding end of the shaft 26 via an intermediate gear 4o rotatably attached to the frame 7. are doing.

In the drive mechanism for each roller as described above, when the drive motor 32 rotates in the direction of the arrow, the second rotating shaft 24 also rotates in the same direction, and the second paper feed roller 23 rotates in the direction to feed the paper 10. do. Since the first rotating shaft 17 is also rotationally driven in the direction of the arrow via the second chain 38, the first paper feed roller 16 rotates in the direction in which the paper 10 is fed.

On the other hand, as the second rotating shaft 246 rotates, each gear rotates 39°40
．． 41 causes the shaft 26 to rotate in the same direction as the second rotating shaft 24. Therefore, the facing roller 25 does not act in the direction of feeding the paper, but instead rotates in the direction of regulating the feeding of the lower paper, for example, which has been fed two sheets, and plays the role of returning the lower paper to its original position.

Although not shown in the figure, the drive motor 32 is driven based on a paper feed command signal from the main body of the copying machine,
If O is detected by the detection switch 29, the circuit structure is stopped. Here, when the paper 10 is detected by the detection switch 29, the rear end of the top paper 10 is
A roller 16 is still positioned in abutting relationship with the first paper feed roller 16. When the paper lO reaches the detection switch 29, the paper feed roller 3 on the copying machine main body 1 side
It is rotated in synchronization with the copying process of the fourth copy, and feeds the paper IO to the copying process. In the figure, reference numeral 42 is a mounting table guide for stabilizing the movement of the mounting table 8, and 43 is a guide provided with dimensions corresponding to the movement of the IJ edge 11 and regulating the leading edge of the paper 10.

1 Next, the operation of the cassette device 5 having the structure described above will be explained. First, the cassette device according to the present invention is installed in the paper feed section 2 of the main body 1 of the copying machine. At this time, if the paper feed section 2 cannot support the cassette device 5, it may be screwed onto the copying machine main body l side using a coupling means such as a screw 42 as shown in FIG. Further, a support device for supporting the cassette device 5 from the bottom may be provided separately.

After the cassette device has been installed, the cartridge 11 containing a large amount of paper, for example, about 1000 sheets 1o, is placed on the mounting table 13 of the cassette device, as shown in FIG. At this time, push the mounting table 13 downward with your hand or the like to lock the rear end of the cartridge 11 to the stopper 15 and insert it between the first paper feed roller 16 at the tip, and place the cartridge 11 on the mounting table. I will post it on 13. Then, when the downward pushing force is removed, the tip of the mounting table 13 is lifted up by the tensile force of the spring 19 via the wire 29 and the pulley 17. It rises to the position where it contacts the upper paper 1° and stops. This state is as shown in FIG.

When the loading of the IJ cartridge 11 (car containing the paper 1o) is completed, the print switch is operated. By operating this print switch, the control circuit (
(not shown) outputs a paper feed command signal, and the drive motor 32 on the cassette device side is driven. As a result, the rotational force is transmitted to the first and second rotating shafts 17.24 through the first and second chains 36.38, respectively, and the first and second paper feed rollers 16.23 are rotated in the paper feeding direction. be done. As the first paper feed roller 16 rotates, the uppermost paper lO in pressure contact with the roller 16 is fed, guided by guide plates 21 and 22, and guided to the second paper feed roller 28. This paper 10 is further fed by a second paper feed roller 23, guided by guide plates 27 and 28, and guided to the paper feed roller 3 on the main body side. At this time, the leading edge of the paper 10 pushes down the operating piece 29-1 of the detection switch 29, and it is detected that the paper 10 has reached the paper feed roller 3 position. Based on this detection,
The driving motor 32 is stopped, and the paper feeding operations of the first and second paper feeding rollers 16 and 23 are stopped. Then, the paper feed roller 3 is rotated in synchronization with the copying operation by a control circuit on the copying machine main body side, and the paper 10 is fed to the copying process. Here, as the paper feed roller 3 rotates, the guide plate 28 is pushed down and pressed against the paper feed roller 3 with a moderate force by the action of the urging means, so that a good feeding force is applied to the paper 10. do. After feeding by the paper feed roller 3, a paper feed command signal is output from the control circuit of the main body of the copying machine, and the above-described operation is repeated to feed the paper 10 one by one.

With the above-described operation, the first paper feed roller 16 and the paper 10 are still in pressure contact with each other while the first and second paper feed rollers 16 and 23 are stopped. The reason why the first paper feed roller 16 is stopped in pressure contact with the paper IO in this way is to prevent the next paper from being fed continuously regardless of the output of the paper feed command signal during multi-copying. ing. Furthermore, by stopping the first paper feed roller 16, the trailing edge of the paper is pressed against the paper feed roller 16; from the left, the paper feed roller 3 on the main body side acts as a resistance to the feeding force. However, since the shaft 17 of the first paper feed roller 16 is continuously fed to the drive unit via the one-way rotation clutch 30, even if the paper 10 is fed, it will not idle and act as resistance.

On the other hand, if two-sheet feeding (double feeding) occurs at the first paper feeding roller 16 during the paper feeding operation, this is prevented at the position of the second paper feeding roller 23. In other words, for the two sheets of paper that have reached the second paper feed roller 23, the upper paper is about to be fed by the second paper feed roller 23, but the lower paper is rotated in the opposite direction by the opposing roller 25. returned to its original position. Therefore, the two sheets of paper are separated and only the upper sheet of paper lO is guided to the paper feed roller 3, thereby preventing two-sheet feeding (double feeding).

Here, the opposing roller 25 is provided to prevent two sheets from being fed, but the invention is not limited thereto, and a separation means having the structure shown in FIG. 4 may be provided. This is the second paper feed roller 2
A pressing plate 6 whose surface is provided with a rubber sheet 45 that presses against the
is provided, this pressing plate 46 is urged by a spring 47,
The rubber sheet 45 is pressed against the second vertical paper roller 23. The pressing plate 46 is rotatably provided on a support shaft 48.

This action means that the lower paper that has been fed two sheets is placed on the rubber sheet 4.
5 and prevents paper feeding. However, the upper paper is fed by sliding on the surface of the lower paper due to the paper feeding force of the second paper feed roller 23. In other words, the friction between the paper lO and the rubber sheet 45 is greater than the friction between the paper 10, and 2
Sheet feeding is prevented and sheets can be reliably fed one by one.

As explained above, according to the cassette device according to the present invention,
The cassette itself is equipped with a mechanism to prevent paper feeding and double-sheet feeding, and a biasing mechanism that always presses the top of the paper stored in the paper feeding roller is installed. Regardless of the number of sheets accommodated, it is possible to reliably feed one sheet at a time. It can also be used in ordinary copying machines and can handle large-scale copying.

[Brief Description of the Drawings] Fig. 1 is a perspective view showing the cassette device of the present invention, Fig. 2 is a sectional view showing the cassette device of the invention installed in the main body of a copying machine, and Fig. 3 is a large amount of paper. car that accommodates IJ
FIG. 4 is an enlarged view of essential parts of another cassette device of the present invention.

Claims (1)

[Scope of Claims] 1. A cassette device removably installed in a paper feed section of a copying machine main body, which has a storage section for storing a large amount of paper in a protrusion of the copying machine main body, and a fulcrum in the storage section. A loading table for placing a large amount of paper, which is rotated around the platform, a biasing means that always biases the loading table in one direction, and a pressing unit that presses against the large amount of paper being urged so that the sheets are sequentially placed starting from the topmost paper. A first paper feed roller that feeds paper, a second paper feed roller that feeds the paper fed by the first paper feed roller to the copying machine main body side, and the second paper feed roller.
A paper feeding cassette device comprising a separating means provided opposite to a paper feeding roller to prevent double feeding. 2. The paper feeding cassette device according to claim 1, wherein the separation means includes an opposing roller provided at a constant interval from the first paper feeding roller. A paper feeding cassette device according to claim 1, characterized in that: 4. The paper feeding cassette device according to claim 1, wherein rotational force is transmitted to the rotating shaft of the first paper feeding roller via a one-way rotation clutch. 5. A paper feeding cassette device according to claim 2, wherein the opposing roller is rotated in a direction opposite to the paper feeding rotation direction of the second paper feeding roller.