JP2001339571A - Original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove a deposited material such as dust deposited on a read face of an original or an adhesive protruded from the surrounding of an adhesive tape or the like that may cause black streaks on a read image resulting from being transferred onto a read glass pane before the original reaches a read position so as to suppress occurrence of black streaks onto the read image and can prevent distortion in the read image by using a roll, guide or the like to bring the original into contact onto the read glass so as to read the image from the original in an original carrying read mechanism for a facsimile terminal and a copying machine. SOLUTION: A deposited material on a read face of an original 9 is removed by friction between a sheet member 1 with high friction provided to a position apart from a read position 11 on a read glass pane 2 toward a paper feed section 13 and the read face. When the original 9 reaches the read position 11, transfer of the deposited material on the read face of the original 9 at the read position 11 on the read glass 2 is prevented so as to suppress black streaks caused in the read image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for transporting and reading an original such as a facsimile machine and a copying machine.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. 09-307695 discloses a conventional technique for improving the quality of a read image (which indicates an image obtained by reading a document image on a document). According to the present invention, a reading glass 2, a reading roller 5, a guide 6, a guide 7, and a step forming member 10 as shown in FIG. 4 are arranged in a document reading section such as a facsimile apparatus and a copying machine.

[0003] The thickness of the step forming member 10 attached to the reading glass 2 prevents the reading surface of the document 9 from contacting the reading position on the reading glass 2 to read dust or the like adhering to the reading surface of the document. The transfer to the glass 2 is prevented, and the black streak generated in the read image is suppressed.

[0004]

SUMMARY OF THE INVENTION As in the prior art,
CVT method (Constant Velocity Transp) that reads an original image while moving the original
In the (ort method), there is a possibility that the attached matter on the document reading surface is transported to the reading position, and the attached matter falls to and adheres to the reading position, blocking the reading light from the light source. In that case,
Since black streaks occur in the read image, quality deterioration of the read image is inevitable.

Further, at the reading position, the document is not stabilized in the vertical direction due to the space provided on the document reading surface and the reading glass, and the document is vertically vibrated. Therefore, the read image may be distorted. As a countermeasure for this phenomenon, there is a means for holding down the original on the reading glass 2 using a roller, a guide, or the like. Is transferred, and there is a demerit that a black stripe is generated in the read image.

[0006]

According to the present invention, there is provided a document feeder for feeding a document sheet, a transport roller for transporting the document sheets one by one from the document feeder, and a transporter for transporting the document sheet passing through the transport roller. In a document transport reading mechanism having a reading device for reading while reading and a document discharge unit for discharging the document sheet, a cleaning member for a reading surface of the document sheet is provided at a position in the transport direction before the position of the reading device.

[0007] In addition, a high friction sheet material is used as a cleaning member to remove dust and the like adhering to the reading surface of the manuscript paper.

Alternatively, a sheet substrate coated with a high friction coating is used as a cleaning member.

[0009]

The high friction sheet material provided on the original running surface on the paper feed side from the original reading position is rubbed against the reading surface of the running original, thereby removing foreign substances such as dust on the original reading surface.

Therefore, it is possible to prevent foreign substances such as dust on the document reading surface from being transferred to the reading position on the document reading glass, and to suppress black streaks occurring in the read image.

[0011]

Next, an embodiment of the present invention will be described with reference to FIGS. The entire configuration includes a document feeding unit 13 for feeding the set documents 9 one by one,
Conveyance roller 14 for reversing fed-in document 9, guide 15 for feeding the document to document reading unit 16, document reading unit 1
6, a document discharge section 17; Further, the document reading unit 16
A reflection mirror 4 for reflecting an image projected by the light source 3 toward the reading device 18, a reading roller 5 for preventing the original from moving up and down at a reading position 11 on the reading glass 2, , Guide 7 for transporting in the direction of document discharge section 17, reading position 1 on reading glass 2
1, a high-friction sheet 1 attached to the sheet feeding unit 13 side is arranged.

The operation will be described in detail with reference to FIGS. The document 9 is fed one by one by a roller installed in a sheet feeding unit 13, and is conveyed to a document reading unit 16 along a guide 15 while being inverted by a conveyance roller 14 and a conveyance belt. When the document 9 that has reached the document reading unit 16 travels between the reading glass 2 and the guide 6, the document 9 rubs against the high-friction sheet material 1 provided on the sheet feeding unit 13 side from the reading position on the reading glass 2. Then, the attached matter on the reading surface of the original 9 is removed by the friction. The original 9 from which the attached matter on the reading surface has been removed is projected by the light source 3 while being pressed against the reading glass 2 by the reading roller 5 at the reading position 11, and sent to the reading device 18 by the reflection mirror 4. Thereafter, the document 9 that has passed through the reading glass 2 is conveyed by the guide 7 toward the document discharge unit 17 and discharged from the discharge unit 17.

In addition, examples of the sheet material having high friction in the present invention include sheet materials of polyester type, vinyl chloride type and the like.

[0014] Apart from using a high friction sheet material as a cleaning member, there is also a method of applying a friction enhancing coating to a sheet substrate, and specific examples of the coating material include rosin-based, silicon-based, and urethane-based materials. Etc.

Here, it is conceivable that the original may be skewed in the transport path due to a large friction of the cleaning member, which may cause a paper jam. However, it is considered that the original can be transported by being stretched. In order to eliminate this kind of concern, a roller is provided for pressing the document at the upstream end of the cleaning member in the transport direction and for transporting the document forward.
Send out the manuscript.

As another embodiment of the present invention,
In FIG. 1, the position of the cleaning member immediately before the reading roller 5 on the upstream side in the transport direction is set immediately after the downstream side in the transport direction of the document feeder. By installing the cleaning member at such a position, not only the attached matter on the reading surface of the original 9 can be removed and the quality of the read image can be improved, but also the attached matter such as dust on the original paper can be removed at an early stage. Prevention of contamination in the route is possible. Further, a mechanism such as a roller or a guide may be further provided in the transport path in order to obtain friction between the document and the cleaning member.

[0017]

As described above, in the original reading apparatus according to the present invention, dust adhering to the reading surface of the original, correction liquid or ink that has not been fixed, adhesive material protruding from the periphery of the glued sheet or adhesive tape, or the like, is obtained. The adhering matter can be removed before the document reaches the reading position, and the occurrence of black streaks on the image is suppressed. Further, since the original is read by bringing the original into contact with the reading glass using a roller, a guide, or the like, the read image can be prevented from being distorted.

[Brief description of the drawings]

FIG. 1 is a mounting cross-sectional view (an overall configuration) in one embodiment.

FIG. 2 is a mounting cross-sectional view (document reading unit) in one embodiment.

FIG. 3 is a perspective view of one embodiment (document reading unit).

FIG. 4 is a cross-sectional view of the prior art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet material 2 reading glass 3 light source 4 reflecting mirror 5 reading roller 6 guide 7 guide 8 sheet material 9 document 10 step forming member 11 reading position 13 document feeding unit 14 transport roller 15 guide 16 document reading unit 17 document discharging unit 18 reading apparatus

Continued on the front page F-term (reference) 2H076 AA58 BA14 BA24 BA97 2H108 AA14 CB01 JA01 5B047 AA01 BA01 BC18 5C062 AB32 AB33 AB35 AD06 BA06

Claims (3)

[Claims] An original feeder for feeding the original paper; a transport roller for transporting the original paper one by one from the original feeder; and a transporter for transporting the original paper passing through the transport roller. A reading device for reading, and a document conveying / reading mechanism having a document discharge unit for discharging the document sheet, wherein a cleaning member for a reading surface of the document sheet is provided at a position in a conveying direction before a position of the reading device. Document reading device. 2. A document reading apparatus according to claim 1, wherein a sheet material having high friction is used as said cleaning member. 3. The original reading apparatus according to claim 1, wherein a sheet substrate coated with a high friction coating is used as the cleaning member.