JPS5921032B2 - Paper feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention automatically feeds cut sheets used in facsimile machines, copying machines, etc., such as manuscripts and recording paper, one by one, into devices such as facsimile machines and copying machines. This relates to a paper feeding device.

Facsimile machines, copying machines, etc. generally use a device that feeds cut sheets one by one from the bottom of a stack of stacked cut papers into the facsimile machine, copying machine, etc. However, conventionally, in this type of paper feeding device, a double feeding prevention roller is provided in addition to the feeding roller in order to prevent two or more cut sheets from being fed at the same time. , a force in the opposite direction to the feeding direction is applied to the cut paper adjacent to the lowest layer of cut paper to be fed. For this reason, the adjacent cut sheets that have been subjected to a force in the backward direction due to the rotation of the double-feed prevention roller may be bent, jammed, or otherwise severely damaged, and may become unable to be fed. The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and is designed to prevent damage such as bending to the leading edge of cut paper in a device that applies backward force to adjacent paper cuts to prevent double feeding. The purpose of the present invention is to provide a paper feeding device that has the following features. An object of the present invention is to provide a stopper that suppresses the lifting (or rolling up) of the leading edge of a paper sheet so that the leading edge is not deformed by the backward force of the double feeding prevention means. achieved.

The present invention will be explained below based on the illustrated embodiments. 1st
In this embodiment, FIG. 1 shows a cut sheet which holds cut sheets (not shown) in a laminated state and is constituted by a paper table 1 and side plates 2 and 3 that are inclined downward in the direction in which the cut sheets are fed out. A paper storage case is shown.

Bearings 2a, 2b are attached to the side plate 2 on the cut paper sending side, and bearings 3a, 3b, 3c (not shown) are attached to opposing surfaces of the side plate 3 on the cut paper sending side. Bearing 2a,
A feed shaft 4a is fitted into the bearing 3a, and a double feed prevention shaft 5a is fitted into the bearing 2Y) and 3b.

The rotational force of the motor 6 is transmitted through the clutch 7 to the gear 8 from a drive shaft 8a fitted in a bearing 3c (not shown) on the side plate 3, and this driving force is transmitted via the gear 4 to the delivery shaft 4a. , are simultaneously transmitted to the double feed prevention shaft 5a via the gear 5. A feed roller 9 is fixed at the center of the feed shaft 4a, and feed pulleys 10 and 11 are fixed on both sides thereof. On the other hand, a double-feed prevention roller 12 is fixed to the center of the double-feed prevention shaft 5a, and stopper rollers 13 and 14 are mounted on both sides of the double-feed prevention shaft 5a. A mechanism is used to fit them together.
A double feeding prevention roller 12 is provided on the delivery roller 9, and a delivery belt 16 is provided on the delivery pulleys 10 and 11.
The stopper rollers 13 and 14 are provided so as to face each other and come into contact with each other through the stopper rollers 13 and 17a. In this case, the feed roller 9 is made of an elastic material, or is configured to press at least one of the feed shaft 4a and double feed prevention shaft 5a in the direction of the opposing shaft, and the lowermost cut paper 18a ( 2), the axis moves according to the thickness of the cut paper. Also, the diameter of the feed roller 9 is D1, the diameter of both the stopper rollers 13 and 14 is D2, and the double feed prevention roller 12
When the diameter of the roller is D3, the sizes of the respective rollers are set as D1>D2>D3 as shown in FIG.

In addition, the friction force between the feed roller 9 and the cut paper 18a is R1, and the friction force between the stopper rollers 13 and 14 and the cut paper 18a is R1.
When the frictional force with a is R2, and the frictional force between the double feeding prevention roller 12 and cut paper 18a is R3, R1>R2>
Set it to be R3. The clutch 7 shown in FIG. 1 transmits the rotation of the motor 6 to the drive shaft 8a when the paper cut 18 shown in FIG. This prevents the feed roller 9 and double feed prevention roller 12 from being worn out. This is possible by detecting the light from the light source 19 in FIG. 2 with the light receiving section 20 and processing the signal in the amplifier 21, and then operating the clutch 7 in FIG. 1.

The delivery belt 16a is suspended between the delivery pulley 10 and the pulley 16 as shown in FIG. 2, and similarly the delivery belt 17a in FIG. (not shown) is coaxial with the rotating shaft 15 of the pulley 16. The feed belts 16a and 17a are connected to the paper tray 1.
The lowermost layer of cut paper 18a to be fed out of the laminated cut paper 18 loaded on the paper table 1 is placed parallel to the upper surface and slightly higher than the feed belt 16.
a, 17a and receives a force in the feeding direction. The operation of the paper feeding device having the above configuration is shown in Figures 2 and 3.
To explain with a diagram, when cut paper 18 is present on the paper tray 1, the feed shaft 4a and the double feed prevention shaft 5a move as shown by the arrow 22.
, 23, and is suspended between delivery pulleys 10, 11 and pulleys 16, 17.
, 17a act to feed the cut paper 18 in the direction of the arrow 24.

Now, if the lower two sheets of cut paper 18 are to be fed simultaneously, the lowermost cut paper 18a and the cut paper 1 above it
Since the frictional force between the cut paper 18a and the feed roller 9 and between the cut paper 18b and the double-feed prevention roller 12 is greater than the frictional force between the cut paper 18a and the feed roller 8b, the lowermost cut paper 18a moves in the feed direction 24 according to the rotational force of the feed roller. A force is applied to the cut paper 18b in a direction opposite to the feeding direction according to the rotational force of the double-feed prevention roller, and a force is applied to the cut paper 18b to lift the front end upward.
According to the conventional mechanism, the front end of the cut paper 18b is lifted and bent, and the cut paper 18b may become unable to be fed after the cut paper 18a is fed out.
In the device according to the present invention, there are stopper rollers 13 and 14 on both sides of the double-feed prevention roller, which are rotatable in the opposite direction to the feeding direction. However, since no lifting force acts on both sides of the front end of the paper cut 18b, problems such as bending of the paper cut and failure to feed the paper cut do not occur. The above is a description of one embodiment of the paper feeding device according to the present invention, but it goes without saying that the present invention is not limited to this embodiment.

That is, in the first embodiment, as shown in FIGS. 1 to 4, the delivery pulleys 10, 11 and delivery roller 9 are coaxial with the delivery shaft 4a, and the stopper roller 13
, 14 and the double-feed prevention roller 12 are disposed coaxially with the double-feed prevention shaft 5a. However, in the present invention, when the leading edge of the cut sheet is pushed back by the double-feed prevention roller, the leading edge of the cut sheet All you have to do is press down on the tip of the cut sheet to prevent it from lifting.

For example, as shown in FIG. 5 for the second embodiment and FIG. 6 for the third embodiment, the delivery pulley shafts 10a, 10b, delivery pulleys 10-1, 10-2, delivery roller shafts 9a, 9b, There are feed rollers 9-1 and 9-2 on the rollers 9-1 and 9-2, and double feed prevention rollers 12 on the double feed prevention roller shafts 12a and 12b.
-1, 12-2, stopper roller single shaft 13a, 13b
By arranging the stopper rollers 13-1 and 13-2 respectively, the desired purpose can be achieved even if different shafts are used.

Furthermore, as a fourth embodiment, as shown in FIG. 7, a rod-shaped or plate-shaped stopper 25 may be brought into contact with the lower part of the cut paper side of the double-feed prevention roller 12-3, and the desired purpose can be similarly achieved. I can do it.

As described above, the paper feeding device according to the present invention has a structure that presses the leading end of the paper sheet so that the leading end is not deformed by the backward force of the double feeding prevention means, so that the leading end of the paper sheet This has the effect that bending, lifting, etc. do not occur, and therefore, a situation in which feeding becomes impossible occurs does not occur.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a paper feeding device in which a stopper roller is disposed coaxially with a double-feed prevention roller according to the present invention, and FIG. 2 is a side view showing the internal mechanism of the paper feeding device according to the present invention. Fig. 3 is a partial cross-sectional front view of the paper feeding device seen from the feeding side, and Fig. 4 is a front view of the paper feeding device in which the feeding pulley and the feeding roller are coaxial, and the double feeding prevention roller and the stopper roller are coaxial. A side view of the embodiment, FIGS. 5 and 6 show the delivery pulley, delivery roller, double-feed prevention roller,
The second and third embodiments in which the stopper rollers are supported by different shafts, and FIG. 7 shows the stopper rod (or plate)
A fourth embodiment is shown in which the following is provided.

Claims (1)

[Scope of Claims] 1. A plurality of stacked paper sheets, a transport means for transporting one paper sheet to be fed from among the paper sheets, and a transport means for transporting one sheet to be fed from among the paper sheets. In order to prevent double feeding of a sheet of paper and an adjacent sheet of paper, a double feeding prevention means applies force to the adjacent sheet of paper in a direction opposite to the feeding direction. . A paper feeding device comprising a stopper that suppresses lifting of the leading end of the paper sheet so that the leading end is not deformed by the force of the double feeding prevention means. 2 A roller-shaped stopper is disposed on the rotating shaft of the double-feed prevention roller and is rotatably arranged in the opposite direction to the feeding direction of the paper sheets to be fed to transport the paper sheets. When the diameter of the feed roller for this purpose is D_1, the diameter of the stopper is D_2, and the diameter of the double feed prevention roller is D_3, the size relationship of the diameters of the rollers is D_1>D_2>
The paper feeding device according to claim 1, wherein the paper feeding device is set to D_3. 3. A stopper in the form of a roller is disposed on a rotation axis different from the rotation axis of the double-feed prevention roller, and is rotatably arranged in a direction opposite to the feeding direction of the paper sheets to be fed, The diameter of the feed roller for transporting the paper sheets, the diameter of the stopper, and the diameter of the double-feed prevention roller are set so that the front ends of adjacent paper sheets come into contact with the stopper before the double-feed prevention roller. A paper feeding device according to claim 1, characterized in that the paper feeding device comprises: 4 When the frictional force between the feed roller and the paper sheet is R_1, the frictional force between the stopper roller and the paper sheet is R_2, and the frictional force between the double feeding prevention roller and the paper sheet is R_3, the magnitude of the frictional force is Claims 1 to 3 are characterized in that the relationship is set to R_1>R_2>R_3.
A paper feeding device according to any of paragraphs. 5. The paper feeding device according to claim 1, characterized in that a stopper in the form of a rod or a plate is brought into contact with a portion of the double-feed prevention roller.