JPH09139798A - Telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a folded original by detecting a tilt angle of an original along an original carrying direction for two sides. SOLUTION: When an original 10 is carried and an image by one line is read by an image scanner, a picture element P1 detecting at first a density different from the density of a color behind an original and a picture element P2 detecting finally a density different from that of a color behind an original are obtained. When the original 10 is placed with a tilt, the position of the picture element P1 detecting a density different from a that of a color behind an original is changed and similarly the position of the picture element P2 is changed. In which direction and at how much speed the positions of the picture elements are moving for two sides of the original 10 are checked and a tilt angle θ in the original carrying direction for each side is detected. The difference between the tilt angle of two sides to be detected is obtained for each line and occurrence of a folded original is detected by detecting that the difference is higher than a specific angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document folding detection method in a document feeding type reading device.

[0002]

2. Description of the Related Art In a document-conveying-type reading apparatus for reading a document image while conveying a document, the document may be conveyed obliquely when reading a relatively large document or a relatively thin document. When the originals are conveyed diagonally,
Since a document may be torn, a method that automatically detects that the document is being conveyed obliquely and stops the document conveyance, and a method that conveys the document in the opposite direction have already been developed.

As a method for detecting that an original is being conveyed obliquely, one side along the conveying direction of the original or one reference line attached to the carrier sheet is detected by an image scanner, and one side or the reference of the original is detected. There is known a method of detecting an inclination angle of a document with respect to the conveyance direction based on the movement of a line.

However, according to this method, when there is a document break near one side of the above-mentioned document or the side where the reference line of the carrier sheet is present and the opposite side detected by the image scanner, This document break cannot be detected. Therefore, the original may be damaged when the original is folded.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a document break detecting method in a document feeding type reading device capable of detecting a document break.

[0006]

According to the first document feeding type reading method of the first document feeding type reading apparatus of the present invention, in the process of feeding a document, the two sides of the document along the document feeding direction with respect to the document feeding direction. Each of the tilt angles is detected, and when the difference between the tilt angles of the two sides exceeds a predetermined value, it is determined that the document is folded.
The document folding includes wrinkles and flexures of the document.

According to the second document feeding type reading apparatus of the present invention, the document folding detecting method is a process of holding and feeding a document on a carrier sheet having two reference lines parallel to each other along the document transporting direction. In the above, the inclination angle of each reference line with respect to the document conveyance direction is detected, and when the difference between the inclination angles of both reference lines exceeds a predetermined value, it is determined that the document is folded.

A third method of detecting a document break in the document feeding type reading apparatus according to the present invention detects the distance between two sides of a document along the document feeding direction during the process of feeding the document, and detects the distance between the two sides. It is characterized in that when the difference from a predetermined reference interval exceeds a predetermined value, it is determined that the document is folded.

In the document folding detection method in the fourth document feeding type reading apparatus according to the present invention, the process of holding and feeding a document on a carrier sheet having two reference lines parallel to each other along the document transport direction is carried. In (1), the distance between both reference lines is detected, and when the difference between the distance between both reference lines and a predetermined reference distance is equal to or more than a predetermined value, it is determined that the document is folded. .

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS.

FIG. 1 shows a document feeding type reading device.

The original 10 is transported in the direction of arrow A by a transport roller (not shown). An image scanner 1 extending in a direction orthogonal to the conveyance direction of the document 10 is arranged below the conveyance path of the document 10. Above the conveyance path of the original 10 and directly above the image scanner 1,
A background color member 2 for providing a background color different from the background color of the original 10 is provided.

The back color member 2 is a long and thin tube strip extending in the direction orthogonal to the direction of conveyance of the original 10, and a half area of the surface rotation angle range is painted in a dark color and the other half area is painted in a light color. It is painted. When the background color of the original 10 is a light color, the rotation angle position of the back color member 2 is set so that the dark-colored surface of the back color member 2 faces the image scanner 1. When the background color of the document 10 is a dark color, the rotation angle position of the back color member 2 is set so that the lightly colored surface of the back color member 2 faces the image scanner 1.

In FIG. 1, the rotation angle position of the back color member 2 is set so that the background color of the original 10 is light and the surface of the back color member 2 painted in a dark color faces the image scanner 1. Has been done. In this way, as shown in FIG. 2, the original document 10 being conveyed from the image scanner 1 side.
When viewed, the color of the original 10 and the color of the back color member 2 are colors with greatly different densities.

As shown in FIG. 3, the original 10 is conveyed,
When an image for one line is read by the image scanner 1, a pixel P1 that first detects a density different from the density of the color behind the document and a pixel P2 that finally detects a density different from the density of the color behind the document. , Two sides along the conveyance direction of the document 10 are detected.

When the original 10 is tilted, as shown in FIG. 4, the position of the pixel P1 where the density different from the density of the color behind the original is first detected changes. Similarly, the position of the pixel P2 that finally detected a density different from the density of the color behind the document changes. Therefore, by checking whether the pixel position of each of the two sides of the document 10 moves in which direction and at what speed as the document is transported, the tilt angle with respect to the document transport direction is determined for each line and for each side. Detect θ.

Further, the above-mentioned 2 detected for each line.
The difference between the tilt angles of the two sides is obtained. When the obtained difference becomes larger than the predetermined angle, as shown in FIG. 5, there is a possibility that the document is folded, so it is determined that the document is folded and the conveyance of the document 10 is stopped. Let After the transportation of the original 10 is stopped, the original 10 may be transported in the direction opposite to the transportation direction A to return the original 10.

The distance between the two sides of the original 10 is detected line by line, and when the difference between this distance and a predetermined reference interval exceeds a predetermined value, the original is broken. It may be determined that there is. The distance between the two sides of the document 10 is based on the number of pixels from the pixel P1 that first detects a density different from the color behind the document to the pixel P2 that finally detects a density different from the color behind the document. Can be asked.

By the way, the original 10 may be conveyed by being put in a transparent carrier sheet. In such a case, as shown in FIG. 6, a reference line L parallel to the two sides of the carrier sheet 20 in the vicinity of the two sides along the document transport direction.
Note 1 and L2 respectively.

As shown in FIG. 7, when the original 10 is conveyed together with the carrier sheet 20 and the image for one line is read by the image scanner 1, the pixel P1 which first detects the black appearing on the carrier sheet, The pixels P2 that finally detect black appearing on the carrier sheet are detected as the reference lines L1 and L2 of the carrier sheet 20, respectively.

The carrier sheet 2 is provided for each line.
The tilt angles of the reference lines L1 and L2 of 0 with respect to the document conveyance direction are detected. Further, the difference between the tilt angles of the detected reference lines L1 and L2 is calculated for each line. And
If the obtained difference is larger than the predetermined angle, as shown in FIG. 8, there is a possibility that the document is folded, so it is determined that the document is folded, and the conveyance of the document 10 is stopped. After the transportation of the original 10 is stopped, the original 10 may be transported in the direction opposite to the transportation direction A to return the original 10.

Each reference line L of the carrier sheet 20
The distances of 1 and L2 are detected for each line, and when the difference between this distance and a predetermined reference interval is equal to or more than a predetermined value, it is determined that the document is folded. Good. The distance between the reference lines L1 and L2 of the carrier sheet 20 should be determined based on the number of pixels from the pixel P1 that first detects black appearing on the carrier sheet to the pixel P2 that finally detects black appearing on the carrier sheet. You can

[0023]

According to the present invention, it is possible to detect a document break.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a document feeding type reading device.

FIG. 2 is a schematic diagram showing the densities of a document back color member and the densities of documents.

FIG. 3 is a schematic diagram for explaining a method of detecting the positions of two sides of a document along the document transport direction.

FIG. 4 is a schematic diagram for explaining a method of obtaining a tilt angle of each side of a document with respect to a document transport direction.

FIG. 5 is a plan view showing that the inclination angles of two sides of a document are different from each other when a document is folded, and that the interval between the two sides is different from the reference interval. .

FIG. 6 is a plan view showing a carrier sheet.

FIG. 7 is a schematic diagram for explaining a method of detecting the positions of two reference lines marked on a carrier sheet.

FIG. 8 is a plan view showing that the inclination angles of two reference lines are different from each other when a document is folded, and that the interval between the two reference lines is different from the reference interval. .

[Explanation of symbols]

 1 Image Scanner 2 Original Color Material 10 Original 20 Carrier Sheet

Claims (4)

[Claims] 1. When a document is being conveyed, inclination angles of the two sides of the document along the document conveyance direction with respect to the document conveyance direction are respectively detected, and a difference between the inclination angles of the two sides exceeds a predetermined value. A method for detecting a document break in a document-conveying-type reading device that determines that a document break has occurred in a document. 2. An inclination angle of each reference line with respect to the original conveyance direction is detected in the process of holding and conveying the original on a carrier sheet having two reference lines parallel to each other along the original conveyance direction. A method for detecting a document break in a document-conveying-type reading device that determines that a document break has occurred when the difference between the inclination angles of both reference lines exceeds a predetermined value. 3. A document is being conveyed, a distance between two sides of the document along a document conveying direction is detected, and a difference between the distance between the two sides and a predetermined reference distance is equal to or larger than a predetermined value. A method for detecting a document break in a document-conveying-type reading device that determines that a document break has occurred. 4. An interval between both reference lines is detected in the process of an original being held and conveyed on a carrier sheet having two reference lines parallel to each other along the original conveyance direction, and the interval between both reference lines is detected. A method of detecting a document break in a document-conveying-type reading device that determines that a document break has occurred when the difference between the reference interval and a predetermined reference interval is greater than or equal to a predetermined value.