JPS6132216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a paper feed mechanism that automatically and continuously feeds paper stacked in a hopper.

Conventionally, as shown in FIG. 1, as an automatic continuous paper feeding mechanism used in optical mark/optical character reading devices, facsimile devices, etc., a paper 2 loaded on a hopper plate 1 is fed to a feed roller 3.
The picker roller 4 connected to the picker roller 4 extracts the material, and the feed roller 3 and another feed roller 5 send it forward. This mechanism rotates the reverse roller 6 in the opposite direction to the feed roller 3, which slides into contact with the feed roller 3 from below and has a coefficient of friction against the paper that is smaller than that of the roller 3.
The machine reliably feeds out one sheet at a time, but it has the disadvantage that, for example, it is not possible to set more than 100 sheets at the same time for paper with a basis weight of 70 kg, and furthermore, it is not possible to replenish paper during operation. It was hot.

In order to correct the above-mentioned drawbacks, a paper feeding device as shown in FIG. 2 has been devised. That is, a large amount of paper 8 is stacked on a table 7 that can be raised and lowered, and the table 7 is gradually raised by a driving source (not shown) by supplementary control of the distance corresponding to the thickness of the paper to be sent out. However, the apparatus shown in FIG. 2 has a new drawback in that it requires a lifting control device for the table 7, making the mechanism complicated.

The present invention has been made in view of the above points, and by improving the mechanism shown in FIG. 1, it is possible to load a large amount of paper and reliably send out one sheet at a time, similar to the device shown in FIG. Moreover, the present invention proposes a paper feeding mechanism with a simple structure.

In order to achieve the above object, the present invention includes a pickler roller that is swingably mounted, a sub-picker roller that is swingable in the same manner as described above, and is made to follow the picker roller, and a rotatable roller corresponding to these picker rollers. The present invention aims to provide a paper feed mechanism in which a hopper plate is attached to a hopper plate.

Hereinafter, the present invention will be explained in detail according to preferred embodiments shown in the drawings.

FIG. 3 is a diagram showing the paper feeding mechanism of the present invention, in which 20 is a belt 2 connected to a drive source 21.
2 is a reverse roller that rotates in conjunction with the hopper plate 26; 23 is a feed roller that slides in contact with the reverse roller 20 to feed out the paper 24; and 25 is a picker roller that is linked to the feed roller 23 and picks up the paper 24 stacked on the hopper plate 26. In addition to these known paper feeding mechanisms, the present invention makes the picker roller 25 swingable, and furthermore, a sub-picker roller 27 is attached in conjunction with the picker roller 25, and a mechanism corresponding to these rollers 25, 27 is provided. Rotatable idler rollers 28, 28 are provided.

To explain this in detail, the above-mentioned Pitzker roller 25
has a predetermined distance from the feed roller 23 and is swingably attached to the feed roller 23 via a bracket 29,
The rotational force of the feed roller 23 by a drive source (not shown) is transmitted via the belt 30. Therefore, the picker roller 25 swings in an arcuate trajectory with the feed roller 23 as the center and the predetermined interval as a radius.

The sub-picker roller 27 is attached to the bracket 31.
The rotational force of the picker roller 25 is transmitted via the belt 32 at a predetermined interval. Like the picker roller 25 linked to the feed roller 23, the sub-picker roller 27 is attached to the picker roller 25 so as to be movable up and down.
5 and swings on a trajectory separated by the predetermined interval. When the paper 24 is in a vertically elongated shape, the paper 24 can be picked up smoothly and reliably by attaching a plurality of sub-picker rollers 27 in series.

Further, as shown in FIG. 3, the picker roller 25 and the sub-picker roller 27 are positioned above the paper 24 during the initial operation of the present invention.

The rotatable idler rollers 28, 28
is attached to the lower surface of the plate 26 so that its peripheral surface faces a notch 26a provided in the plate 26 from below the hopper plate 26. The idler roller 28 is installed at a position corresponding to the rocking locus of the picker roller 25 and the sub-picker roller 27, that is, as shown in FIGS. 4 and 5, which will be explained later. When it descends due to its own weight, it comes into contact with the hopper plate 26.

In FIG. 3, 34 is a spring that presses the reverse roller 20 to bring it into sliding contact with the feed roller 23, 35 is another feed roller that feeds the paper 24 forward, 36 is an idler roller that comes into sliding contact with the other feed roller 35, 37 is a spring that presses the idler roller 36; 38
is the above hopper plate 26 and guide plate 3.
This is a connection plate that connects the three.

Next, the operation of the paper feeding mechanism of the present invention will be explained.

First, when a specified number of sheets of paper 24 are loaded, the uppermost surface 24a of the paper 24 is placed on the guide plate 33.
The hopper plate 26 and the guide plate 33 are positioned relative to each other in advance, taking into consideration the thickness of the paper to be used, so that they are located on almost the same plane as the picker roller 2 shown in FIG.
5 and the sub-picker roller 27 is lifted upward to set the paper 24.

Next, when a drive source (not shown) linked to the feed roller 23 is driven, the feed roller 23
rotates in the direction of arrow X to send out the paper 24 forward (leftward in FIG. 3), and along with this, the picker roller 25 and sub-picker roller 27 also rotate in the same direction. Paper 24 in contact with the rollers 25 and 27
When the rollers 25 and 27 rotate, they are sent forward by frictional force, and are continuously sent out via the feed roller 23 and another feed roller 35. At this time, the reverse roller 20 is rotated by the driving source 21 in the direction of the arrow Y in FIG. Due to the reverse roller 20, all sheets of paper 24 except the top layer are stopped at that position and are not sent out.

FIG. 4 is a diagram showing the state of the rollers of the paper feeding mechanism of the present invention when the amount of paper remaining is high. In the figure, the picker roller 25 is located forward of the front end of the paper 24. When there is a small amount of paper remaining as shown in FIG. 4, the uppermost surface 24a of the paper 24 is
Since the picker roller 25 is located in front of the paper 24, it assists in feeding the paper 24.

FIG. 5 is a diagram showing the state of the rollers when sending out the final sheet. In the figure, the final sheet 24 is being held between the picker roller 25 and the idler roller 28 and being sent forward. Further, the sub-picker roller 27 is in sliding contact with another idler roller 28 and is idling. The final paper 24 is fed out while being held between the picker roller 25 and the idler roller 28, and the frictional resistance caused by the paper 24 slidingly contacting the hopper plate 26 can be removed, and the load on the feed roller 23 can be reduced. There is.

In addition, in FIGS. 3 to 5, the picker roller 25 is connected to the feed roller 23 and the paper 2.
The sub-picker roller 27 descends as the number decreases.
The horizontal position of the sub-picker roller 27 is equal to or higher than the horizontal position of the sub-picker roller 27. Therefore, when the amount of remaining paper is such that the paper 24 is located below the guide plate 33, the picker roller 25 is located above the horizontal position of the sub-picker roller 27, and the paper 24 is positioned below the guide plate 33.
4 to smoothly send it upward.

As explained above, the present invention has a structure in which a conventionally used picker roller is made slidable, a swingable sub-picker roller is linked to follow the picker roller, and an idler roller is provided corresponding to these rollers. Since it is possible to load a large amount of paper and reliably feed each sheet,
Moreover, it does not require a table elevation control device like the conventional one, and can have a simple structure. Furthermore,
The difficulty in feeding the paper upward, which occurs as the number of sheets decreases, is solved by the assistance of the picker roller linked to the feed roller, and the paper is smoothly fed. Furthermore, it is possible to feed up to the last sheet of paper, and an idler roller is installed to eliminate the frictional resistance between the paper and the hopper plate that occurs during this process, reducing the load on the feed roller and improving efficiency. be able to. Incidentally, according to the inventor's experiments, it has been found that when the feeding mechanism of the present invention is used, it is possible to set and feed 500 sheets of paper with a basis weight of 70 kg at a time.

It should be noted that the drive source transmission means of the paper feed mechanism of the present invention is not limited to the belt, but may of course be formed by a chain, gears, or the like.

[Brief explanation of the drawing]

1 and 2 are diagrams showing a conventional paper feeding mechanism, FIG. 3 is a diagram showing an embodiment of the paper feeding mechanism of the present invention, FIG. FIG. 5 is a diagram showing the state of the rollers when sending out the final sheet. 1...Hopper plate, 2,8...Paper, 3,5
... Feed roller, 4... Picker roller, 6... Reverse roller, 7... Table, 20... Reverse roller, 21... Drive source, 22, 30, 32... Belt, 23, 35... Feed roller, 24... Paper,
25... Picker roller, 26... Hopper plate, 27... Sub-picker roller, 28... Idler roller, 29, 31... Bracket, 33... Guide plate, 34, 37... Spring, 36... Idler roller, 38... Connection plate.

Claims (1)

[Claims] 1. A type of paper that has a reverse roller that rotates in conjunction with a drive source, a feed roller that slides in contact with the reverse roller to feed the paper, and a picker roller that is coupled with the feed roller and picks up the paper stacked on a hopper plate. In the feeding mechanism, the picker roller 25 is swingably attached to the feed roller 23 at a predetermined interval, and the picker roller 25 is
Sub-picker roller 2 moves up and down following 5.
7 attached to the picker roller 25, and rotatable rollers 28, 28 are provided on the lower surface of the hopper plate 26 in correspondence with the picker roller 25 and sub-picker roller 27.