JPH04246039A - Paper sheets loader - Google Patents

Abstract

PURPOSE:To prevent any paper feeding failure from occurring by way of keeping off the buckling of paper sheets fed out of a paper feeding means. CONSTITUTION:An auxiliary guide 4, which regulates the size of a loop in contact with paper sheets S being fed piece by piece through a paper feed roller 6 and a separate pad 7, is installed in a paper feed cassette 1. With this constitution, any buckling in a loop part of the paper sheets S due to a too-much feed quantity of the paper feed roller 6 is prevented from occurring, thus paper feeding operation is surely performable even in the case of stiff paper sheets.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is applicable to printers, for example.
The present invention relates to a paper sheet stacking device that is attached to an image forming apparatus such as a copying machine and is capable of sequentially feeding paper sheets stored in a stacked state.

0002

2. Description of the Related Art A paper feed cassette 70, which is an example of a conventional paper sheet stacking device, uses a combination of a cassette upper cover 71 for covering and a cassette main body 72 for storing paper sheets, as shown in FIG. There are some configurations.

[0003] Furthermore, the paper feed cassette is a universal type in which a width regulating plate 51 for regulating the position of the paper sheets in the width direction and a length regulating plate 52 for regulating the position of the rear end of the paper sheets in the paper feeding direction are incorporated. There are also some.

FIG. 7 shows a registration roller 7 installed in an image forming apparatus that feeds paper sheets one by one from the paper feed cassette 70.
3 shows an example of a paper feeding mechanism for feeding the paper into paper. The paper feed mechanism includes a paper feed roller 74 , a separation pad 75 that is biased by a spring or the like on the paper feed roller 74 , and guides the paper sheet S sent out by the paper feed roller 74 and the separation pad 75 to the registration roller 73 . It is composed of paper feed guides 76 and 77.

[0005] With this configuration, the uppermost paper sheet S stacked and stored in the paper feed cassette 70 is fed out by the paper feed roller 74, and other sheets fed out at the same time due to friction are blocked by the separation pad 75. Therefore, the paper sheets S are sent out one by one from the paper feeding mechanism. Then, the fed paper sheet S is guided by the paper feed guides 76 and 77, and its leading end abuts against the registration roller 73 while forming a loop.

[0006]

[Problem to be Solved by the Invention] When the paper sheets S are fed from the cassette 70, the loop portion of the paper sheets S is fed due to an excessive amount of feeding due to being taken out or excessive contact with the paper feed roller 74. It receives an upward force from the roller 74. Particularly stiff paper sheets may buckle,
As shown in Figure 7, the apex angle ΘR of the loop part is Θ≦90°
In this case, the component force F2 of the paper feeding force F1 of the paper sheet S to the registration roller 73 becomes 0 or acts in the direction of pulling the paper sheet S back, and the thrust force of the paper sheet S to the registration roller 73 is impaired. There was a problem that paper feeding failure (jam) could occur.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a paper sheet stacking device that prevents paper feeding failures due to buckling of paper sheets during paper feeding.

[0008]

[Means for Solving the Problems] The present invention provides an auxiliary guide that comes into contact with paper sheets sent out by a paper feeding means and regulates the size of the loop formed by the paper sheets.

[0009]

[Function] According to the above structure, the auxiliary guide prevents buckling due to excessive looping of paper sheets due to excessive feeding amount.

0010

Embodiment FIGS. 1 and 2 show a first embodiment of the present invention.

Reference numeral 1 denotes a cassette body of a paper feed cassette (paper sheet stacking device) for stacking and storing paper sheets S, and the cassette body 1 includes a width regulating section 2 for regulating the position of the paper sheets S in the width direction.
and a length regulating section 3 that regulates the position of the rear end of the paper sheet S in the paper feeding direction are integrally provided. Further, an auxiliary guide 4 is integrally provided on the paper feeding side of the cassette main body 1 (on the right side in the figure).

FIG. 2 shows a paper feeding mechanism for feeding the paper sheets S loaded in the cassette main body 1 one by one to the registration rollers 5, and 6 is a paper feeding roller for taking out the paper sheets S. , 7 is a separation pad that prevents paper sheets S from being taken out or double fed, and 8 and 9 are paper feed upper guides and paper feed lower guides that guide the fed paper sheets S to the registration rollers 5.

As shown in FIG. 2, the auxiliary guide 4 extends to a position where it comes into contact with the upper surface of the sheet S sent out by the sheet feed roller 6 and separation pad 7.

The operation of the above configuration will be explained. Paper sheets S taken out from the paper feed cassette by the paper feed roller 6
passes through the paper feed upper guide 8 and the paper feed lower guide 9 and reaches the registration roller 5. At this time, the auxiliary guide 4 prevents the paper sheet S from coming into contact with the paper feed roller 6 and the loop portion of the paper sheet caused by an excessive feeding amount, and as a result, the paper sheet S receives a force pushing upward from the paper feed roller 6. First, as shown in Figure 2, paper sheets S
The apex angle ΘR of the loop portion is suppressed to ΘR>90°, thereby suppressing the loss of the component force F2 of the sheet feeding force F1 of the sheet S to the registration roller 5. Further, by attaching the auxiliary guide 4 to the paper feed cassette side, it is easy to assemble it during manufacturing or repair.

(Embodiment 2) As shown in FIG. 3, an auxiliary guide 10 having almost the same structure as the auxiliary guide 4 is incorporated into the upper cover 11 of the paper feed cassette, and its function is similar to that of the first embodiment. It's the same. According to this method, it is possible to integrally mold the auxiliary guide 10 with the upper cover 11. Further, the auxiliary guide 10 may be movable in the X direction in the figure.

(Embodiment 3) As shown in FIG. 4, the auxiliary guide 12 is attached to the width regulating plate 14 that prevents paper sheets in the universal cassette 13 from shifting in the width direction. It is the same as the example. In the same figure, 15 is a length regulating plate that prevents paper sheets from shifting in the length direction.

In this manner, by attaching the auxiliary guide 12 to the width regulating plate 14 of the universal cassette 13, it is possible to prevent paper feeding failures due to buckling of paper sheets of all sizes.

(Embodiment 4) As shown in FIG. 5, the auxiliary guide 16 is detachably attached to the cassette body 17, and its operation is the same as that of the first embodiment. According to this method, when feeding stiff paper sheets, there is no need to replace the paper feed cassette, and it is only necessary to attach the auxiliary guide 16. Furthermore, the auxiliary guide 16 can be manufactured and sold separately. Alternatively, the cassette main body 17 may be provided with a groove so as to be movable in the X direction in the figure.

In this embodiment, the present invention is applied to a paper feed cassette, but the present invention can also be applied to a so-called deck type etc. in which stacked paper sheets are moved up and down using a drive source such as a motor. The present invention may be applied to paper sheet loading devices of the following formats.

Further, the number of auxiliary guides may be set as appropriate depending on the size of the paper sheets, etc.

[0021]

[Effects of the Invention] The paper feed auxiliary guide prevents paper feed failures due to buckling of paper sheets by preventing contact between the loop portion of paper sheets and the paper feed roller due to excessive paper feed, etc. be able to. This is particularly effective when feeding stiff paper sheets.

By attaching the paper feed auxiliary guide to the paper sheet stacking device, it becomes easy to assemble it during manufacturing or repair.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

[Fig. 2] A diagram showing the positional relationship between the auxiliary guide and paper feeding means shown in Fig. 1.

FIG. 3 is a perspective view showing a second embodiment of the present invention.

FIG. 4 is a perspective view showing a third embodiment of the present invention.

[Fig. 5] Fourth aspect of the present invention
A perspective view showing an example of

[Fig. 6] An exploded perspective view showing an example of a conventional paper feed cassette.

[Figure 7] Diagram showing the state of paper sheets sent out from a conventional paper feed cassette

[Explanation of symbols]

1, 13, 17 Cassette body 4, 10, 12, 16 Auxiliary guide 6 Paper feed roller 7 Separation pad 11 Cassette top cover 14 Width regulation plate

Claims (6)

[Claims] Claim 1: A paper sheet stacking device for stacking and storing paper sheets sent out by a paper feeding means, wherein the size of a loop formed by the paper sheets brought into contact with the paper sheets sent out by the paper feeding means; A paper sheet loading device characterized by being provided with an auxiliary guide for regulating the paper sheet loading device. 2. The paper sheet according to claim 1, wherein the paper feeding means comprises a paper feeding roller and a separation pad, and the auxiliary guide regulates feeding of the paper sheet in a direction to separate the paper sheet from the paper feeding roller. type loading device. 3. The paper sheet loading device according to claim 1, which comprises a cassette top cover and a cassette main body, and an auxiliary guide is provided on either the cassette top cover or the cassette main body. 4. The paper sheet stacking device according to claim 1, further comprising a regulating section for regulating the widthwise position of the paper sheets to be stacked and stored, and an auxiliary guide provided on the regulating section. 5. The paper sheet loading device according to claim 4, wherein the regulating section is provided movably. 6. The sheet stacking device according to claim 1, further comprising a removable auxiliary guide.