JP3070782B2 - Image reading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus,
In particular, the present invention relates to an image reading apparatus that simplifies the configuration of an image reading unit and enables cost reduction.

[0002]

2. Description of the Related Art In a conventional facsimile apparatus, for example, as disclosed in Japanese Patent Application Laid-Open No. 64-10771, an image reading section is composed of a contact type image sensor, a rod lens assembly, an LED assembly and the like. The sensor unit is configured to face a white roller having a document supporting function, and a paper feed roller for feeding a document is provided separately from the above-described white roller.

[0003]

In the above prior art, a paper feed roller for feeding a document is provided separately from the above-mentioned white roller, so that the space becomes large, the apparatus becomes large, and the cost increases. And the weight is increased. The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-described problems in the prior art, simplify the configuration of the image reading unit, reduce the size, and reduce the cost. An object of the present invention is to provide an image reading device that can be down.

[0004]

SUMMARY OF THE INVENTION The above objects of the present invention are as follows.
In an image reading apparatus having a document conveying means to be read and a contact sensor as the document reading means, the document conveying means is a feed roller facing the contact sensor, and a central portion of the feed roller A low-friction surface that is white on one side, rotatable independently of the other parts,
This is achieved by an image reading apparatus in which a paper feed roller having the other half surface formed of a high friction surface is provided, and a means for controlling the driving of the paper feed roller independently of the feed roller is provided.

[0005]

An image reading apparatus according to the present invention, a single roller, since to perform the main transport of the automatic feeding and document (for conveying the original in the correct feed amount), low price, small
It is possible to realize a light-weight image reading device with an automatic sheet feeding function.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view for explaining a configuration of a composite roller which is a main part of an image reading apparatus according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view thereof. The composite roller shown in this embodiment includes a feed roller 2 and a paper feed roller 3 as shown in the drawing. The feed roller 2 is fixed to a peripheral surface of a cored bar 2a driven by a driving source (not shown). The paper feed roller 3 is fixed to a peripheral surface of a core tube 3c that is rotatably held around the core metal 2a of the feed roller 2. As described later (see FIG. 4 ), the surface of the above-described paper feed roller 3 has a half circumferential surface formed of a low friction portion 3a formed of a white low friction material.
The other half circumferential surface is a high friction portion 3b formed of a black high friction material
It is composed of Further, a worm wheel 3 d is fixed to the above-mentioned paper feed roller 3, and the worm wheel 3 d is
The driving force is transmitted from a. Although not shown in FIGS. 1 and 2, as will be described later (see FIG. 3), the reflective photosensor 7 set toward the surface of the paper feed roller 3 It is provided for detecting a moving position. Reference numeral 1 denotes a contact type sensor, 5 denotes a separation rubber, and 6 denotes a document to be read.

[0007] The operation of the present embodiment configured as described above is as follows.
Hereinafter, description will be made with reference to FIGS. FIG.
3A to 3D are cross-sectional views of the sheet feeding roller 3. When the original 6 is set, the paper feed roller 3 is turned on as shown in FIG.
Are arranged in the relational positions as shown in FIG. Separation of manuscript 6
In the conveyance, the drive motor 4 is rotated, the paper feed roller 3 is rotated in the direction of arrow A, and the original 6 is separated from the remaining original 6 a between the high friction portion 3 b of the paper feed roller 3 and the separation rubber 5. As shown in FIG. 4B, one document 6 is guided to the contact sensor 1. During this time, the feed roller 2 is also
And the original 6 is driven by the paper feed roller 3
After being transported between the contact sensor 1 and the feed roller 2, the document 6 is given a main transport force by the feed roller 2. The paper feed roller 3 rotates only when the document is fed, the rotation position of the paper feed roller 3 is detected by the above-mentioned reflection type photo sensor 7, and stops after one rotation. Here, since the high friction portion 3b of the feed roller 3 is made of a black material and the low friction portion 3a is made of a white material, when the output of the reflection type photosensor 7 changes from "L" to "H", The rotation of the paper feed roller 3 is stopped.

By the above operation, after the paper feed roller 3 stops, the document 6 is conveyed while sliding on the low friction portion 3a of the paper feed roller 3, as shown in FIG. FIG. 4 (d)
As shown in FIG. 1, one document 6 is conveyed by the feed roller 2 while being read by the contact sensor 1,
The next original is waiting at the separation rubber 5 because the paper feed roller 3 is stopped. In order to separate and convey the next document, the drive motor 4 is rotated again, and the paper feed roller 3 is rotated in the direction of arrow A, thereby performing the above-described operation. As described above, according to the present embodiment, the original 6 can be separated and conveyed by one roller (composite roller), and the effect of realizing a small and inexpensive image reading apparatus can be obtained. Further, as shown in the above embodiment, the detection of the rotation position of the paper feed roller 3
When the surface color of the low friction portion 3a and the high friction portion 3b of the paper feed roller 3 is changed and the detection is performed by the reflection type photo sensor 7, the rotation of the paper feed roller 3 is performed in a small space. There is an effect that the movement position can be detected.

The above embodiment is merely an example of the present invention, and it goes without saying that the present invention is not limited to this. For example, as shown in FIG. 3, by forming the low friction portion 3a of the paper feed roller 3 with a sponge layer (low hardness layer) 8b inside the low friction portion 8a and a low friction layer 8a on the surface, the low friction portion 3a of FIG. As shown in FIG.
When the document is conveyed while sliding on the low friction portion 3a, the pressure of the contact portion between the paper feed roller 3 and the contact sensor 1 can be reduced, and the document conveyance load due to friction can be reduced.

[0010]

As described above in detail, according to the present invention, the structure of the image reading section can be simplified, the size can be reduced, and the image reading apparatus which can reduce the cost can be realized. It has a great effect.

[0011]

[Brief description of the drawings]

FIG. 1 is a perspective view showing a composite roller as a main part of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the composite roller shown in FIG.

FIG. 3 is a cross-sectional view of a sheet feeding roller according to another embodiment.

FIG. 4 is a diagram for explaining the operation of the embodiment shown in FIG. 1;

[Explanation of symbols]

1: close contact sensor, 2: feed roller, 3: feed roller, 3a: low friction portion of feed roller, 3b: high friction portion of feed roller, 3d: worm wheel, 4: drive motor, 4
a: worm gear, 5: separation rubber, 6, 6a: manuscript,
7: Reflection type photo sensor.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 1/00

Claims (3)

(57) [Claims] 1. An image reading apparatus comprising: a document conveying means to be read; and a contact sensor as said document reading means, wherein said document conveying means is a feed roller opposed to said contact sensor; At the center of the paper feed roller, a half-surface is provided with a white low-friction surface and the other half-surface is provided with a high-friction surface, which is rotatable independently of the other portions, and drives the paper feed roller. An image reading apparatus comprising means for controlling independently of a feed roller. 2. A photoelectric conversion type paper feeding roller, wherein a high friction surface of the paper feeding roller is formed of a black color material in addition to the above-mentioned means, and is set toward the surface of the paper feeding roller. The image reading device according to claim 1, further comprising a rotation position sensor. 3. The image reading apparatus according to claim 1, wherein the low friction surface of the paper feed roller has a low hardness layer therein.