JP2002354193A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reader that prevents dust such as paper powder and rubber powder of the carrier rollers from staying in an image read section. SOLUTION: In the image reader provided with an original supply device 201 that automatically supplies an original 202 to a glass plate 102 of a reader main body 101, an original side cleaning means 210 for eliminating dust such as paper powder deposited on the original 202 from the original side is placed in an original carrying path in the original supply device 201.

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 provided with a document feeder for feeding a document to an image reading section of an apparatus main body.

[0002]

2. Description of the Related Art Conventionally, in a copying machine, a scanner, a facsimile apparatus, or the like, an optical scanning unit for irradiating a document with light is stopped at a predetermined document reading position, and an automatic document feeding apparatus (A
2. Description of the Related Art There is known an apparatus having a function of reading a document while moving the document using DF (Auto Document Feeder).

When reading a document using an automatic document feeder (ADF), the document placed on a document table is sequentially conveyed by rollers, as disclosed in Japanese Patent Application Laid-Open No. Hei 6-178054. , An original is read below the platen roller, and is further conveyed by a roller to automatically feed the original.
A method of discharging a document from F) is generally known.

Further, as disclosed in Japanese Patent Laid-Open No. 10-56542, an image reading section of an automatic document feeder (ADF) detects whether or not there is dust,
2. Description of the Related Art A device that moves a reading position to a place where there is no dust and reads an image is generally known.

[0005]

However, when an image is read by the automatic document feeder (ADF) in the flow reading mode, dust such as rubber powder and paper powder of the transport rollers is carried by paper, and the image reading unit is not used. When attached to the drift reading glass, there is a problem that a black streak is generated in the read image and that the reading position is erroneously detected when the drift reading position is adjusted.

[0006] Further, even if the dust adhering to the sink reading glass is detected and the original is read in a place where there is no dust, the detection accuracy of the dust is low and the influence of the dust cannot be completely avoided. There is a problem that the number of garbage to be collected is enormous, and detecting and avoiding garbage cannot be dealt with completely.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to prevent dust such as paper dust and rubber dust of a conveying roller from staying in an image reading unit. An image reading device is provided.

[0008]

According to the present invention, there is provided an image reading apparatus provided with a document feeder for automatically feeding a document to an image reading section of an apparatus body. A document surface cleaning means for removing dust such as paper dust attached to the document from the document surface is provided in the document transport path in the feeding device.

The document surface cleaning means is a brush, and the brush is pressed against the document surface to clean the document surface. When removing dust such as paper dust adhered to the document surface using this brush, it is preferable to rotate the brush.

The document surface cleaning means is a spatula member,
The document surface is cleaned by bringing the spatula-shaped member into contact with the document surface.

It is preferable that the apparatus further comprises a dust collecting means for collecting dust such as paper dust removed from the document surface by the document surface cleaning means. It is effective that the dust collecting means includes a fan for sucking dust.

Further, the document surface cleaning means may be a suction device for sucking dust attached to the document surface as air is sucked. This suction device preferably includes a fan that sucks air and a suction port that is arranged near the document surface.

The document surface cleaning means is a biased electric cleaning member, and is characterized in that dust is removed from the document surface by bringing the electric cleaning member into contact with the document surface.

[0014] The electric cleaning member may be a metal roller. It is preferable that the metal roller rotates in the direction opposite to the document transport direction when removing dust from the document surface. It is preferable to provide a roller cleaning member for cleaning dust adhered to the surface of the metal roller.

[0015] The electric cleaning member may be a metal plate.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments.

(Embodiment 1) FIG. 1 is a sectional view showing a schematic configuration of a digital scanner as an image reading apparatus to which the present invention is applied.

Reference numeral 101 denotes a scanner body as an apparatus body, and an automatic document feeding apparatus (document feeding apparatus) as a document feeding apparatus for automatically feeding a document 202 to a scanning glass 102 as an image reading unit of the scanner body 101. ADF) 201
A brush 210 serving as a document surface cleaning unit for removing dust such as paper dust adhering to the document from the document surface is provided in the document transport path in the automatic document feeder 201.

An automatic document feeder (ADF) 201 is detachably attached to the scanner main body 101, and the set original 202 is moved by the conveying rollers 203 to 208 and the platen roller 209 to scan the reading glass 102 of the scanner main body 101. And collect it. While the document passes between the platen roller 209 and the flow reading glass 102, the scanner body 101 optically scans the document to read information of the document.

The brush 210 scrapes off dust such as paper dust and rubber powder attached to the original surface by pressing against the original surface, and rotates in a direction opposite to the original conveying direction.
Further, a fan 211 is provided as refuse collection means for collecting scraped refuse. The fan 211 is used to remove the scraped dust from the reading glass 102.
Suction dust so that it does not adhere to the surface.

The scanner body 101 includes an optical scanning unit 103A that optically scans an original, a lens 107 as an imaging unit that forms an optical image obtained by the optical scanning unit 103A, and an image formed by the lens 107. And a CCD 108 serving as a photoelectric conversion unit that performs photoelectric conversion of the converted image.

The optical scanning unit 103A includes a first optical bench 109
And a second optical bench 110 that moves at a half speed with respect to the first optical bench 109. The first optical bench 109 has a light source 103 and a mirror 104 for irradiating a document, and the second optical bench 110 has mirrors 105 and 1.
06 are respectively attached. The first and second optical tables 109 and 110 are connected to a stepping motor (not shown) by wires, and the movement of the stepping motor is controlled in parallel with the original table glass 111.

The position sensor 112 is the first optical bench 1
A home position sensor 09 detects the original position on the platen glass 111 by moving the optical tables 109 and 110 by rotating the stepping motor forward and backward based on this position.

With such a configuration, the automatic document feeder (A
When reading the image of the document 202 conveyed from the DF) 201, the first mirror base 10 is moved to a preset reading position by a stepping motor (not shown).
9 is moved and stopped. Document 202 is transport roller 2
03-207 and the reading glass 102
Is passed through the light source 103,
Mirror 104, second mirror 105, third mirror 106,
The light is optically scanned by the CCD 108 via the lens 107.

The original 202 is transferred to the brush 21 while being transported.
The dust that has been cleaned and scraped off by the
Aspirated by 1.

As described above, it is possible to prevent dust such as paper powder and rubber powder from adhering to the reading glass 102,
Prevents black streaks from appearing on scanned images, and
It is possible to prevent erroneous detection of the reading position when determining the moving reading position.

Although there is no change in the effect of removing dirt from the document surface even in a configuration in which there is no fan 211 for collecting dirt scraped off by the brush 210, the scraped dirt moves to other places and affects the image. Therefore, it is desirable to install the fan 211.

The position of the brush 210 is not limited to the position shown in FIG. 1. For example, the same effect can be obtained by disposing the brush 210 between the transport roller 206 and the platen roller 209.

The brush 210 is of a rotary type and has a cylindrical shape with bristles 210a radially implanted on the outer periphery as shown in FIG. In the case of this rotary brush 210, it is rotated in the direction opposite to the direction in which the document is transported, so that dust on the document surface is reliably removed.

Instead of this rotary brush 210, FIG.
As shown in FIG. 7, it is also possible to use a fixed brush 2101 having a shape in which bristles 210a are provided only on the surface facing the document surface. Even if the brush is not brought into contact with the original without rotating, the effect of removing dust is not impaired.
Also in this case, another position, for example, the transport roller 206
The same effect can be obtained by installing the brush 210 between the roller 210 and the platen roller 209.

Next, another embodiment of the present invention will be described. In the following description, points different from the first embodiment will be mainly described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

(Embodiment 2) FIGS. 4 and 5 show Embodiment 2 of the present invention.

In the second embodiment, the basic structure is the same as that of the first embodiment, but a spatula-shaped member 301 is used as a document surface cleaning means for removing dust attached to the document surface. As shown in FIG. 5, the spatula-shaped member 301 is a long plate-shaped member extending in the width direction of the paper, and has a shape in which the abutting portion with the paper is wedge-shaped.

The spatula-shaped member 301 is an automatic document feeder (A
DF) 201 is attached to the original surface in the original transport path to scrape off dust such as paper dust attached to the original surface. Like the first embodiment, the scraped-off dust is sucked by the fan 302 and collected so as not to adhere to the flow-reading glass 102.

According to such a configuration, the first embodiment
The same effect can be obtained.

Also in this embodiment, the spatula-shaped member 30
The position of 1 is not limited to the position shown in FIG.
The same effect can be obtained even if it is installed at another position, for example, between the transport roller 304 and the platen roller 305.

(Third Embodiment) Next, a third embodiment will be described with reference to FIG.

In the third embodiment, the brush 210
A fan 501 is provided as a suction device that directly sucks dust and the like without using the spatula-shaped member 301 or the like.

The suction port 502 of the fan 501 is disposed near the document surface, and when the document is conveyed by the automatic document feeder (ADF), the fan 501 operates to remove dust such as paper dust adhered to the document surface. The document is sucked from the suction port 502 and the document surface is cleaned.

The position at which the suction port 502 sucks dust from the document surface is not limited to the position shown in FIG. 7, and the same effect can be obtained even when the suction port 502 is provided between the conveying rollers 503 and 504, for example. Is obtained.

(Embodiment 4) Next, Embodiment 3 will be described with reference to FIG.

In the third embodiment, a metal roller (bias roller) 610 as a biased electric cleaning member is used as a document surface cleaning means, and the bias roller 610 is brought into contact with the document surface. This removes debris from the manuscript surface.

The bias roller 610 is biased, and rotates in the direction opposite to the direction in which the document is transported when removing dust from the surface of the document.

Further, a roller cleaning member 611 for cleaning dust adhering to the surface of the bias roller 610 is provided.

According to the present embodiment, the original 202 is cleaned by the bias roller 610 while being conveyed, and dust drawn by the bias roller 610 is removed from the roller surface by the roller cleaning member 611.

Since it has been confirmed by experiments that dust such as paper dust adhering to an original is positively charged, a negative bias is applied to the bias roller 610. However, since the charging of dust such as paper dust can change depending on the surrounding environment and the configuration of the apparatus, a positive bias may be applied to the bias roller 610 in some cases.

Even if the cleaning member 611 for cleaning the bias roller 610 is not provided, the dust can be removed from the document surface. However, if the surface of the bias roller 610 becomes dirty, the force of drawing the dust may be weakened by the bias. Therefore, it is desirable to install the cleaning member 611.

The position of the bias roller 610 is not limited to the position shown in FIG.
06 and the platen roller 209, the same effect can be obtained.

(Fifth Embodiment) Next, a fifth embodiment will be described with reference to FIG.

In the fifth embodiment, the basic configuration is the same as that of the fourth embodiment. However, a document surface cleaning means for removing dust adhering to the document surface is not a metal roller but a metal roller.
A metal plate 710 is used. A bias is applied to the metal plate 710 in the same manner as the metal roller 610 according to the fourth embodiment. Pull garbage. With such a configuration, the same effect as in the fourth embodiment can be obtained.

Also in the fourth embodiment, the metal plate 710
Is not limited to the position shown in FIG.
For example, it may be disposed between the transport roller 206 and the platen roller 209.

[0052]

As described above, according to the present invention,
A document surface cleaning unit is provided to clean dust such as paper dust adhered to the document surface and rubber dust of the transport rollers, so that the dust is carried by the document and adheres to the image reading unit such as the flowing glass.
It is possible to prevent the occurrence of black streaks in the read image and the erroneous detection of the reading position when the moving reading position is adjusted.

In particular, if a brush is used as a document surface cleaning means, dust can be knocked off efficiently. In particular, if the brush is rotated, cleaning can be performed more efficiently.

When a spatula-shaped member is used as the document surface cleaning means, dust attached to the document surface can be scraped off.

If the dust removed by the document surface cleaning means is collected by a dust collection means such as a fan, scattering of the dust can be prevented.

If a suction device is used as the document surface cleaning means, dust can be removed in a non-contact manner with the document.

Further, if a biased electric cleaning member such as a metal roller or a metal plate is used as the document surface cleaning means, dust can be electrically sucked and thus can be efficiently cleaned.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of an image reading apparatus according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration example of a document surface cleaning unit according to the first embodiment.

FIG. 3 is a diagram showing another configuration example of the document surface cleaning unit according to the first embodiment.

FIG. 4 is a sectional view showing a schematic configuration of an image reading apparatus according to a second embodiment.

FIG. 5 is a diagram illustrating a configuration example of a document surface cleaning unit according to the second embodiment.

FIG. 6 is a sectional view showing a schematic configuration of an image reading apparatus according to a third embodiment.

FIG. 7 is a sectional view showing a schematic configuration of an image reading apparatus according to a fourth embodiment.

FIG. 8 is a sectional view showing a schematic configuration of an image reading apparatus according to a fifth embodiment.

[Explanation of symbols]

101: Scanner body 102: Flowing glass (image reading unit) 103: Light source 107: Imaging means 108: Photoelectric conversion means 109, 110: First and second optics Table (optical scanning means) 201: automatic document feeder 203 to 208, 304, 403, 404: transport rollers 209, 305: platen roller 210: brush (document surface cleaning means) 211 ··· Fan (garbage collection means) 301 ··· Spatial member (document surface cleaning means) 302 ··· Fan (garbage collection means) 501 ··· fan (document surface cleaning means) 502 ··· Suction port 610. ..Metal rollers (document surface cleaning means) 611: cleaning member 710: metal plate (document surface cleaning means)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuyoshi Yamamoto 3-30-2 Shimomaruko, Ota-ku, Tokyo F-term in Canon Inc. (reference) 2H076 AA04 BA01 BA15 BA24 BA35 BA36 BA47 BA63 BA95 BA97 2H109 CA22 3F101 AB03 AB07 AB09 AB11 5C062 AA05 AB02 AB30 AB32 AD06 BA06

Claims (13)

[Claims] 1. An image reading apparatus provided with a document feeder for automatically feeding a document to an image reading section of an apparatus body, wherein a sheet adhered to the document is provided in a document feed path in the document feeder. An image reading apparatus provided with a document surface cleaning means for removing dust such as dust from the document surface. 2. The image reading apparatus according to claim 1, wherein said document surface cleaning means is a brush, and the brush is pressed against the document surface to clean the document surface. 3. The image reading apparatus according to claim 2, wherein the brush is rotated when removing dust such as paper dust attached to the document surface using the brush. 4. The document surface cleaning means is a spatula member,
2. The image reading apparatus according to claim 1, wherein the document surface is cleaned by bringing the spatula member into contact with the document surface. 5. The image reading apparatus according to claim 1, further comprising dust collecting means for collecting dust such as paper dust removed from the document surface by said document surface cleaning means. 6. The image reading apparatus according to claim 5, wherein said dust collecting means includes a fan for sucking dust. 7. An image reading apparatus according to claim 1, wherein said document surface cleaning means is a suction device for sucking dust attached to a document surface as air is sucked. 8. The image reading apparatus according to claim 7, wherein said suction device includes a fan for sucking air, and a suction port arranged near a document surface. 9. The apparatus according to claim 1, wherein the document surface cleaning means is a biased electric cleaning member, and removes dust from the document surface by bringing the electric cleaning member into contact with the document surface. Image reading device. 10. An image reading apparatus according to claim 9, wherein said electric cleaning member is a metal roller. 11. An image reading apparatus according to claim 10, wherein said metal roller rotates in a direction opposite to a direction in which the original is transported when removing dust from the original surface. 12. The image reading apparatus according to claim 10, further comprising a roller cleaning member for cleaning dust adhered to the surface of the metal roller. 13. The image reading apparatus according to claim 9, wherein said electric cleaning member is a metal plate.