JPS60102345A - Paper feeding device - Google Patents

Abstract

PURPOSE:To improve the reliability of the captioned apparatus by installing a paper-sheet separator in linear contact form at a prescribed acute angle for a paper feeding roller and pressing said paper-sheet separator to the paper feeding roller side by an elastic member. CONSTITUTION:Onto the upper part of a paper feeding roller 21, a paper-sheet separator 24 is installed so as to generate linear-contact with the paper feeding roller 21 at a prescribed acute angle of theta, and a leaf spring 25 is arranged onto the upper part of the paper-sheet separator 24, which is pressed to the paper feeding roller 21 side. Therefore, a various sorts of paper sheets from thick original copies for communication to thin original copies can be inserted into the paper feeding roller 21 one by one, and can be transported into a facsimile apparatus, and the reliability of the paper feeding apparatus can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (al) Technical Field of the Invention The present invention relates to an improvement in a paper feeding device for a document sheet for transmission in a facsimile machine.

(bl Conventional technology and problems) A communication method that scans the original to be transmitted, breaks it down into pixels, converts the shading of these pixels into electrical signals, and transmits them, so that on the receiving side, a receiving recording surface similar to that of the transmitted original is obtained. is called a facsimile. In such a facsimile machine, a schematic diagram of a paper feeding device for supplying the document paper for transmission is shown in FIG.

As shown in the figure, the conventional paper feeding device includes a rubber paper feeding roller 1, a rubber paper separator 2, and a rubber paper separator 2.
The paper separator 2 can be wrapped around the paper feed roller 1 and pressurized by the pressure spring 3, or the vicinity of the tangent between the paper separator 2 and the paper feed roller 1 can be applied by the pressure spring 3. Paper feed roller 1 and paper separator 2
It was installed in a state of face-to-face contact.

In addition, as shown in FIG. 2, there is also a paper feeding device having a structure in which the paper separator 2 is brought into surface contact with the paper feeding roller 1 at a tangential line. FIG. 3 schematically shows a state in which original paper for transmission is conveyed to such a paper feeder. FIG. 3 is a schematic diagram showing a state in which two sheets of manuscript paper for transmission have been conveyed to the paper feeder, and as shown in the figure, manuscript paper 11 and manuscript paper 1.
The friction coefficient between the manuscript paper 12 and the paper separator 13 is μ2, and the friction coefficient between the manuscript paper 12 and the paper separator 13 is μm.
When the friction coefficient between 1 and paper feed roller 14 is μ8,
Apply pressure 23 so that the relationship μm<μ2<μa occurs.
the elastic modulus of the paper separator 13 and paper feed roller 1
By appropriately selecting the friction coefficient of 4, the lowest manuscript paper 11 of the stacked manuscript papers 11 and 12 for transmission is
The documents are then sent one by one into the facsimile machine.

However, in conventional paper feeding devices such as the one shown in FIG. is formed, and when a large number of transmission document sheets enter this gap, as the document sheets advance in a wedge-shaped narrow direction, the large number of sheets are pressed against the paper separator with a strong force.

At this time, if the coefficient of friction between the sheets is large, the sheets are not separated from each other, and conversely, a large frictional force is generated at this location, causing a problem that many sheets are fed at the same time by 1if.

Particularly when the original paper for transmission is thin, many sheets of paper tend to fit into this gap, resulting in the inconvenience that many sheets of paper are frequently sent.

(c+ Purpose of the Invention The object of the present invention is to eliminate the above-mentioned problems and to provide a novel paper feeding device that can reliably feed each document sheet for transmission into a facsimile machine. It is something.

(dl Structure of the Invention To achieve the above object, the paper feeding device of the present invention includes a paper feeding roller, a paper separator, a paper industry disk, and an elastic member that presses the paper separator. is set at a predetermined acute angle with respect to the paper feed roller, and the paper separator is installed in line contact with the paper feed roller, such that the elastic member presses the paper separator toward the paper feed roller. It is characterized by the following.

+el Embodiment of the Invention An embodiment of the invention will be described below in detail with reference to the drawings.

FIG. 3 is a schematic diagram of the paper feeding device of the present invention. As shown in the figure, the paper feeding device of the present invention is located close to the paper feeding roller 21 and feeds a document sheet 22a for transmission of a facsimile machine.

22b, 22c, and 22d are installed in a stacked manner, and a paper guide 23 is provided above the paper feed roller 21, and is in line contact with the paper feed roller 21 at a predetermined acute angle θ. A paper separator 24 made of rubber is provided. A plate spring 25 made of elastic steel is installed over the entire surface of the paper separator 24, and one end A of this plate spring 25 is fixed using a screw or the like (not shown). spring 2
At the other end B of 5, an elastic pressure spring 26 is provided. The paper feed roller 21 is rotated while a large number of transmission manuscript papers 22a, 22b, 22c, and 22d are placed on the paper guide 23 of such a paper feed device. Then, pressurize spring 2 so that the pressure of pressurizer spring 26 becomes a predetermined value.
Adjust the pressure in step 6. In this way, the paper separator 24 is brought into contact with the paper feed roller 21 at a predetermined acute angle θ and in a line contact.

In this way, the leaf spring 25 installed over the entire surface of the upper part of the paper separator 24 is arranged so that when a large number of transmission manuscript papers are stacked on the paper guide 23, the leading edge of the transmission manuscript paper pushes up the paper separator 24. This serves to prevent the contact angle between the paper separator 24 and the paper feed roller 21 from changing. In addition, since the entire surface of the paper separator 24 is reinforced with a leaf spring 25, a large number of manuscript papers can be transferred between the paper feed roller 21 and the paper separator 24.
When it is inserted between 0 and 0, it works to separate the leading edge of the manuscript paper one by one. In this way, the paper separator 24
is in contact with the paper feed roller 21 at a predetermined acute angle θ in the form of a line contact, and the force of the pressure spring 26 is increased to press the line contact portion with a large pressure per unit area. Therefore, there is no gap for the second original 22c on the paper guide 23 to be inserted, and the leading edge of the original hits the paper separator and stops there, so only the first original 22d on the paper guide is inserted. The paper is now inserted into the paper feed roller 21.

In this way, according to the paper feeding device of the present invention, documents are inserted into the paper feeding roller 21 one by one. Further, as a result of experiments, if the structure is such that the pressure force of the plate spring 25 or the pressure spring 26 can be varied in several stages, it becomes possible to automatically feed from a thin document sheet of 30 μm to a thick document sheet of about 200 μm.

ffl Effects of the Invention As described above, according to the paper feeding device of the present invention, it is possible to insert documents one by one into the paper feed roller, from thick original documents for sending to thinner original documents, and to reliably feed facsimile sheets one by one. Since it can be transported into the device, it has the effect of improving the reliability of the device.

[Brief explanation of drawings]

Figures 1 and 2 are schematic diagrams of conventional paper feeding devices;
FIG. 4 is a schematic diagram showing a state in which a transmission document is conveyed in a conventional paper feeding device, and FIG. 4 is a schematic diagram of the paper feeding device of the present invention. In the figure, Li2, 21 is a paper feed roller, 2, 13.2
4 is a paper separator, 3.26 is a pressure spring, 11, 12
．． 22a. 22b, 22c, and 22d are transmission originals, 23 is a paper guide, 25 is a plate blade, μm is a friction coefficient between the transmission original sheets, μ2 is a friction coefficient between the paper separator and the transmission original,
μ3 indicates the coefficient of friction between the paper feed roller and the original for transmission. Figure 1 Figure 2 Figure 3 Figure g4 Figure

Claims (1)

[Claims] It consists of a paper feed roller, a paper separator, a paper guide plate, and an elastic member that presses the paper separator, and the paper separator is at a predetermined acute angle with respect to the paper feed roller, and the paper separator is at a predetermined acute angle when the paper is fed. A paper feeding device, characterized in that the elastic member is installed in line contact with the roller, and the elastic member presses the paper separator toward the paper feeding roller.