JPH04164731A - Paper feeding device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use] The present invention relates to a paper feed system for a facsimile machine with two paper feed positions, and more particularly to a paper feed device that allows the machine to be converted into a /h type and to reduce costs.

[Conventional technology]

BACKGROUND ART As facsimile machines have become widespread as office automation equipment and are even more common in homes, demands for smaller size and lower prices have been increasing.

The facsimile machine that uses a fully contact image sensor developed for this purpose has an operation panel 2N as shown in Figure 2.
, separation pad 22, platen roller 23, recording platen roller 24, recording paper 25, power supply 26, feeding roller 27,
It is composed of a contact image sensor 28, a light source 29, a thermal head 30, a system control board 31, and the like.

In such a facsimile device, a document is inserted face down from the front side of the device up to the feeding roller 27.

At this time, a document detection sensor (not shown) detects the document, and the supply roller 27 rotates clockwise. Further, the feeding roller 27 and the separation pad 22 are in pressure contact with each other to separate and convey the documents one by one. Further, a platen roller 23 is pressed against the contact type image sensor 28 . When the leading edge of the 5M document is inserted between them, the platen roller 2
3 to read the image information while sending the manuscript.
pp. 210''.

Also, regarding the paper feed device in facsimile machines,
Various methods have been proposed to simplify the configuration and convey documents with high precision.

For example, the device described in Japanese Utility Model Application Publication No. 59-31625 uses an auto document feeder (ADF).
) The separation roller and the document transport roller are configured as a single roller, and by passing the document between this roller and the pressing roller, the document transport path is shortened and the entire apparatus is miniaturized.

Further, in the apparatus described in Japanese Utility Model Application Publication No. 59-177265, the size of the apparatus is reduced by detecting the original using the groove of the original transport roller.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, the separation and conveyance mechanism was configured with two rollers, for example a feeding roller and a platen roller, so it was necessary to make the device more compact and reduce costs. It was difficult to measure.

SUMMARY OF THE INVENTION An object of the present invention is to provide a paper feeding device that can solve these problems and reduce the size and cost of the device.

[Means to solve the problem]

In order to achieve the above object, the paper feeding device of the present invention has an ADF.
The separation roller section is arranged in the center of the document conveyance roller section, and the ADF separation roller section has an area with a large friction coefficient and an area with a small friction coefficient on the roller surface. The feature is that they are arranged alternately.

Further, a document reading section and an ADF section of the equal-magnification image sensor are arranged on the same circumference of the document separation and conveyance roller,
A feature is that the angle formed between the surface of the reading section of the 1-magnification image sensor and the document conveyed by the ADF section is less than 90 degrees.

In addition, in the ADF separation roller section, the circumferential length (l,) of the area with a large friction coefficient is shorter than the circumferential length (1,) from the ADF separation position to the original detection position. There is a characteristic in the setting.

[Function] In the present invention, a gap is created between pages of a document by a change in the coefficient of friction on the surface of the ADF separation roller, and this gap is detected by a document detection sensor to detect the page gap.
Documents can be separated and transported using book rollers.
Configuration is simplified.

Further, since the original reading section and the ADF section of the same-magnification image sensor are arranged on the same circumference of the original separating and conveying roller, the apparatus can be made smaller than before.

In addition, since the angle formed between the surface of the reading section of the 1x image sensor and the document transported by the ADF section is less than 90 degrees, the configuration can be simplified by eliminating the need for a document guide plate, leading to cost reduction. .

In addition, since the circumferential length of the area with a large friction coefficient on the roller surface of the ADF separation roller section is set shorter than the circumferential length from the ADF separation position to the document detection position, Even if the timing at which the trailing edge of the document passes through the separation position is the same as the timing at which the trailing edge of the area of the surface of the ADF separation roller with a small friction coefficient passes through the document separation position,
Gaps between pages of a document can be detected reliably.

〔Example〕 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a paper feeder according to an embodiment of the present invention, FIG. 3 is an enlarged view of an ADF separation roller section according to an embodiment of the present invention, and FIG. 4 is a side view of a paper feeder according to an embodiment of the present invention. FIG. 3 is a perspective view of the paper device.

In FIG. 1, l is a document detection sensor (microswitch), 2 is a document separation pad, 3a and 3b are leaf springs, 4 is a contact type 1-magnification image sensor, 5 is a document separation and conveyance roller, 6 is a document table, 7 is the manuscript. Further, in FIG. 4, 5a is an ADF separation roller section, and 5b is a document conveyance roller section, which constitute the document separation and conveyance roller 5.

In this embodiment, the original 7 is set on the original table 6 and supplied to the ADF section. This ADF section is composed of a document separation pad 2 and an ADF separation roller section 5a.
The document separation pad 2 has a plate spring 3 attached to the ADF separation roller portion 5a.
The principle of document separation in the ADF section is the same as that described in detail in Utility Model Application No. 59-31625. The original is conveyed so as to reach the surface of the reading section of the same-magnification image sensor 4. In this embodiment, the angle θ between the reading surface of the same-magnification image sensor 4 and the original is set to be less than 90 degrees, and the leading edge of the original slides on the reading surface and touches the original separation conveyance roller 5. It is guided to the contact part of the 1x image sensor 4. When the document reaches this contact portion, the document is sandwiched between the contact portions and conveyed. Regarding the transport and reading principles, please refer to "Nikkei Electronics, 198
November 16, 7th issue (Arashi 434).

210'', pp. 210''.

In addition, the coefficient of friction between the surface of the ADF separation roller and the original is μ
m, the coefficient of friction between the document separation pad 2 and the document is μ2, and the coefficient of friction between the documents is μ3. If there is a relationship of μm〉μ2〉μ3, the first and second pages of the document will be conveyed without any gap. be done. This also applies to subsequent pages. However, if the original 7 is conveyed without any gaps, the gap between pages of the original 7 cannot be detected.

Therefore, in this embodiment, as shown in FIG. 3, regions with a large friction coefficient and regions with a small friction coefficient are alternately arranged on the surface of the ADF separation roller. Here, if the friction coefficient between the M document and the roller surface in the area where the friction coefficient is large is μ], and the friction coefficient between the document and the separating roller surface in the area where the friction coefficient is small is μm', then μm〉μ2〉μ3. In this case, the document 7 is separated and conveyed.

In addition, in the case of μ2>μ3>μm', the original is not separated and conveyed, but the previous page of the original continues to be conveyed even while this separation and conveyance is not being performed, resulting in a gap between the pages. Become. Therefore, by detecting this gap with a document detection sensor, page spacing can be detected. The document detection sensor is described in detail in Japanese Utility Model Application Publication No. 59-177265.

Specifically, rubber is used as the material for the area with a large friction coefficient on the surface of the ADF separation roller, and resin (ABS resin) is used as the material for the area with a small friction coefficient. Furthermore, rubber is used as the material for the document transport roller portion 5b because it is necessary to increase the coefficient of friction.

Furthermore, in this embodiment, the length 11 on the circumference of the region with a large friction coefficient of the ADF separation roller shown in FIG. Upper length 1. Set it shorter. As a result, the worst timing (when the trailing edge of the document passes the document separation position and A
The document detection sensor 1 can detect the page spacing of the document 7 even when the rear end of the area where the friction coefficient of the surface of the DF separation roller is small passes through the document separation position at the same timing.

[Effects of the Invention] According to this embodiment, by alternately arranging regions with a large friction coefficient and regions with a small friction coefficient on the roller surface of the ADF separation roller section, it is possible to create gaps between pages of a document.

Further, by arranging the original reading section and the ADF section of the equal-magnification image sensor on the same circumference of the original separating and conveying roller, it is possible to achieve miniaturization.

In addition, by making the angle between the surface of the reading section of the 1x image sensor and the document transported by the ADF section less than 90 degrees, the document guide plate can be omitted, resulting in cost reduction6. By making the circumferential length of the area with a large friction coefficient on the roller surface shorter than the circumferential length from the ADF separation position to the document detection position,
A document detection sensor can reliably detect gaps between pages of a document.

[Brief explanation of drawings]

FIG. 1 is a side view of a paper feeding device in an embodiment of the present invention;
Fig. 2 is a block diagram of a facsimile machine using a conventional contact type image sensor, and Fig. 3 is an A diagram of an embodiment of the present invention.
FIG. 4, which is an enlarged view of the DF separation roller section, is a perspective view of a paper feeding device in an embodiment of the present invention. 1: Document detection sensor (micro switch), 2: Document separation pad, 3a, 3b: Leaf spring, 4. Same size image sensor, 5: Document separation and transport roller, 5a: ADF separation roller section, 5b = Document transport roller La part. 6. Original table, 7. Original, 21. Operation panel. 22: separation pad, 23 platen roller, 24 recording platen roller, 25: recording paper, 26: power supply. 27: Feeding roller, 28/Contact type image sensor 229
, light source, 30/thermal head, 31 system control board, 1. : Circumferential length from the ADF separation position to the document detection position, 1. , : A, D F The length on the circumference of the region with a large friction coefficient of the separation roller 4 μm:
Coefficient of friction between the surface of the ADF separation roller and the document is 7 μm'
・Friction coefficient between the document and the surface of the separation roller in the area where the friction coefficient is small, μ2 ・Friction coefficient between the document separation pad and the document, μ
3: Coefficient of friction between originals. Figure 1 Figure 3 Figure 4

Claims (3)

[Claims] (1) In a paper feeding device that sequentially feeds stacked paper sheets using rollers made of friction members, an ADF separation roller section is arranged in the center of the document transport roller section, and both roller sections are integrated. A paper feeding device comprising a separation conveyance roller, and an ADF separation roller portion having regions with a large friction coefficient and regions with a small friction coefficient alternately arranged on the roller surface. (2) A document reading section and an ADF section of the same-size image sensor are arranged on the same circumference of the document separation and conveyance roller;
2. The paper feeding device according to claim 1, wherein the angle formed between the surface of the reading section of the same-magnification image sensor and the document conveyed by the ADF section is less than 90 degrees. (3) In the ADF separation roller section, the circumferential length of the region with a large friction coefficient is set to be shorter than the circumferential length from the ADF separation position to the document detection position. The paper feeding device according to item 1.