JPH0328026Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a paper feeding device that separates document sheets stacked on a paper feeding tray one by one and supplies them to the copying surface of a copying machine main body.

[Technical background of the invention]

Conventionally, for example, a paper feed device that feeds originals stacked on a paper feed tray one by one into the main body of a copying machine has a cutout section commonly called a half-moon roller for the bottommost sheet of originals on the paper feed tray. There is a machine that sends out the paper with a cutting roller, separates it into one sheet at a separating section, and then draws it out from the separating section using a pinch roller and supplies it to the main body of the copying machine.

There are several reasons why cutout rollers are used in such paper feeding devices.

First, if you use an ordinary round roller to feed the original, this roller protrudes from the paper feed table toward the document side, so when setting the document on the paper feed table, the leading edge of the document hits the roller and it is difficult to set it. The leading edge of the lower document is bent. However, if a notched roller is used, the notched portion of the notched roller is made parallel to the paper feed table when paper feeding is stopped, and the document can be easily set.

Also, it is easier to feed the document by the sharp edge of the notch rather than by the circumferential surface of the roller during paper feeding.

Furthermore, when the separated document is pulled out using a pinch roller, if the roller is round, the roller is always in contact with the document, which causes large friction and requires a large torque. However, if the cutout roller is used, by making the cutout portion parallel to the document when it is pulled out, the cutout roller does not come into contact with the document, and the document can be pulled out with a low load.

[Problems with background technology]

However, notched rollers also have the same problems as ordinary rollers. That is, when sending a document to the separating section, the document may fill the paper feed port in front of the separating section so that the document cannot be fed out, or the document may not be separated by the separating section and a plurality of sheets may be sent out.

In addition, since the cutout roller moves from a state where it is not in contact with the document, the edge of the cutout portion touches the document and feeds the document while lifting it, so an upward force and a force in the forward direction are applied to the bottom paper. . As a result, the original may become twisted and wrinkled.

[Purpose of invention]

The purpose of this invention is to provide a paper feeding device that does not cause damage such as wrinkles to paper such as original documents, reduces paper jams in the paper feeding port and double feed, and can transport the paper reliably.

[Summary of the idea]

This invention has a circular arc portion and a cutout portion on the circumferential surface,
A notched roller is provided in which the arcuate portion contacts the bottom paper of the sheets stacked on the paper feed tray and supplies the paper to the separating portion, and the contact surface with the paper from the arcuate portion has a low coefficient of friction, A projection protruding outward from an arc drawn by the length of the radius of the circular arc portion is provided on the cutout side so as to rotate together with the cutout roller.

[Example of idea]

An embodiment of this invention will be described below with reference to the drawings.

As shown in FIG. 1, a paper feed tray 1 for storing stacked documents P is provided, and a guide 2 is provided opposite to the paper feed tray 1. As shown in FIG.

A roller hole 3 is provided in the paper feed tray 1, and a cutout roller 5 having an arcuate portion 4A and a cutout portion 4B is provided below the roller hole 3. This notched roller 5 is attached to a rotating shaft 6 driven by a motor, and is used to feed out the bottom sheet of the original P.
When not feeding out the document P, the notch 4B is parallel to the paper feed tray 1, rotates when feeding, and when the document P is pulled out by pinch rollers 12 and 13, which will be described later, the notch 4B is parallel to the paper feed tray 1 again. Rotate the axis of rotation 6 so that
is controlled.

Note that the cutout roller 5 is provided at the front so as to come into contact with the leading edge of the document P as much as possible.

On the other hand, as shown in FIGS. 2 and 3, the surface in contact with the document P is lower than the arcuate portion 4A, and an arc R drawn by the length of the radius of the arcuate portion 4A is on the cutout portion 4B side. Lever (protrusion) 7 that protrudes outward
However, the notch portion 4B is attached to the rotating shaft 6 in a state in which it is parallel to the paper feed table 1 and does not contact the document P. Note that this lever 7 is made of a material having a small coefficient of friction, such as synthetic resin.

There is a paper presser plate 8 on top of the document P, which is constantly urged by a spring in a direction away from the paper feed table 1, and at the same time, an operating solenoid presses the document P against the notch roller 5 against this spring. I'm starting to do that.

A separation section 9 is provided downstream of the paper feed port Q where the distance between the paper feed tray 1 and the guide 2 is narrowed. This separating section 9 separates the document P sent out by the cutout roller 5 into one sheet, and includes, for example, a paper feed roller 10 (paper feeding means) rotating in the conveyance direction of the document P and a fixed (non-containing) roller that is pressed against this. rotation) separation roller 1
1 (separation means).

Note that the paper feeding means of the separating section 9 is not limited to the roller 10 that rotates in the conveying direction, but may be a one-way roller, a belt, or the like. In addition, the separating means is a fixed roller 1
The material is not limited to 1, but may be a roller that rotates in the opposite direction to the conveying direction, a belt, a one-way roller, a fixed friction pad, or the like.

Further, the paper feeding means and the separating means may be provided upside down.

Pinch rollers 12 and 13 are provided downstream of the separating section 9 to pull out the separated original P and supply it to the main body of the copying machine.

In the above configuration, the document P is placed on the paper feed tray 1.
When setting the sheet, the cutout portion 4B of the cutout roller 5 is parallel to the paper feed table 1, as shown in FIG. Therefore, the lever 7 does not protrude from the roller hole 3. Therefore, the document P is inserted smoothly until it comes into contact with the guide 2.

In such a state, when a paper feed command is issued from the copying machine main body, the cutout roller 5 and the lever 7 rotate together, and the lever 7 first moves the document P as shown in FIG.
, and pushes up the document P. This allows the first
In the figure, the document P that was looking into the paper feed port Q rises from the paper feed port Q.

When the lever 7 rotates further, the lever 7 separates from the document P as shown in FIG. 3, and the arcuate portion 4A of the cutout roller 5 comes into contact with the lever 7. As a result, the bottom sheet of the original P is sent out. At this time, the document on the bottom sheet is pulled by friction and static electricity and tries to come out, but is blocked by the edge of the paper feed port Q.

The sent document P is pulled by a paper feed roller 10 rotating in the feeding direction and a non-rotating separation roller 11, which rejects the document that has come out, separates only the bottom paper, and supplies it to pinch rollers 10 and 11.

Then, when the pinch rollers 10 and 11 grip the document and the cutout portion 4B of the cutout roller 5 becomes parallel to the paper feed tray 1, the rotation of the cutout roller 5 stops and the paper feed roller 10 separates from the pinch rollers 10 and 11. The pressure contact with the roller 11 is released. Therefore, the pinch rollers 10, 11
can pull out the document P with a low load.

In the case of continuous paper feeding, the above operations are repeated.

In this embodiment, the originals P stacked on the paper feed table 1 are
The rotary shaft 6 of the cutout roller 5, which has a circular arc portion 4A and a cutout portion 4B, which contacts the lowest sheet of paper and supplies the document P to the separation unit 9, has a rotary shaft 6 that has a lower contact surface with the document P than the circular arc portion 4A. Due to the friction coefficient, the circular arc portion 4A is on the cutout portion 4B side.
Since the lever 7 protruding outward from the arc R drawn by the radius of The advantage of the pinch roller 1 is that it is easy to insert and set the original P, and it has a conveying force.
2 and 13, the following effects can be obtained without losing the ease of pulling out the document P.

First, the lever 7 moves the document P up and down, so
In the process of the vertical movement, gaps are created between each document P, making them easier to separate and reducing the need to feed multiple documents. Further, due to this vertical movement, the document P in the paper feed port Q also moves up and down, so paper jams in the paper feed port Q are also reduced.

Furthermore, after the document P is completely raised by the lever 7, the arcuate portion 4A of the cutout roller 5 comes into contact with the document P and sends it out, so that no excessive force is applied to the document P and it is prevented from twisting. It becomes difficult for me to arise.

In addition, there is a time lag between when the lever 7 contacts the document P and when the arcuate portion 4A of the notched roller 5 comes into contact with it, and since the sharp edges of the notched portion 4B do not come into contact with each other, the plurality of notched rollers 5 is attached to the shaft 6, even if the notched portions 4B are not aligned to some extent, one notched roller 5 will not come into contact with the document P before the other rollers, and
The circumferential surfaces of the notched rollers 5 are in contact at the same time. For this reason,
Since the force of the plurality of cutout rollers 5 acts equally on the document P, the document P is less likely to skew or twist.

Furthermore, since the cutout roller 5 is arranged as close to the paper feed port Q as possible, when the cutout roller 5 is in contact with the document P, the leading edge of the document P does not sag, and the amount of the document peeking into the paper feed port Q is reduced. The number of sheets is reduced, reducing the risk of paper jams and feeding multiple sheets.

Although one embodiment of this invention has been described above, this invention is not limited to the above embodiment.

For example, in the embodiment described above, the lever 7 provided alongside the cutout roller 5 was shown as a protrusion, but a protrusion embedded in the cutout portion 4B may also be used.

Further, in the above embodiment, a document feeding device in a copying machine was shown, but this invention is also applicable to a copying paper feeding device in a copying machine, a paper feeding device in a printing machine, a paper feeding device in a printing device, etc. that conveys paper one sheet at a time. It can be applied to other things as well.

[Effect of idea]

As explained above, according to this invention, the protrusion that protrudes outward from the arc drawn by the radius of the arc portion of the notched roller pushes up the paper on the paper feed table, and feeds the pushed up paper. By falling onto and contacting the arcuate portion of the notched roller protruding from the paper base, force is applied to the bottom paper only in the forward (paper feeding) direction, minimizing the occurrence of wrinkles and twists in the paper. I can do it.

[Brief explanation of the drawing]

1 to 3 are diagrams showing an embodiment of this invention, in which FIG. 1 shows the structure of a document feeding device, and FIGS. 2 and 3 are diagrams explaining its operation. 1... Paper feed table, 2... Guide, 4A... Arc part, 4B... Notch part, 5... Notch roller, R...
Arc, 7...Lever, 9...Separation part.

Claims (1)

[Claims for Utility Model Registration] A paper feeding device that separates and conveys sheets of paper stacked on a paper feeding table one by one at a separating section, which has a circular arc section and a notch section on its circumferential surface, and wherein the circular arc section is A notched roller that is in contact with the bottom paper of the paper and supplies the paper to the separation section, and a contact surface with the paper that is lower than that of the circular arc part and has a coefficient of friction that is smaller than the radius of the circular arc part. a protrusion that protrudes outward from an arc drawn by the notch roller, pushes up the paper on the paper feed table by rotating together with the notch roller, and brings the pushed up paper into contact with the arc portion of the circumferential surface of the notch roller; A paper feeding device characterized by comprising: