JPH0923315A - Original reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the occurrence of overlapped feeding or the like in a simple constitution because of wrong carrying of originals. SOLUTION: At the time of reading an original, a main scanning direction length detection means 12 detects the length of the original in the main scanning direction. A subscanning direction length discrimination means 13 checks whether a regular size paper sheet corresponding to the length in the main scanning direction of the detected original is preliminarily stored or not; and if it is preliminarily stored, the means 13 reads the length of the regular size paper sheet in the subscanning direction. A subscanning direction length detection means 14 detects the length of the original in the subscanning direction. A comparison means 15 compared the length read out by the subscanning direction length discrimination means 13 and that detected by the subscanning direction length detection means 14 with each other to detect overlapped feeding to the like of originals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus that automatically conveys and reads a document, and more particularly, to a document double feed detection and a document other than a standard sheet.

[0002]

2. Description of the Related Art Auto Document Feeder
er: Hereinafter referred to as "ADF". When a document is read by a document reading device provided with), the document may not be fed correctly due to a malfunction of the ADF. For example, a plurality of originals may be sent at one time, a roller for conveying the originals may slip and run idle, or the originals may not be correctly placed at a predetermined position of the scanner. On the other hand, for example, in the facsimile apparatus disclosed in Japanese Patent Application Laid-Open No. 58-173957, by recording all or a part of the transmission original at the transmission side, when the multi-feeding occurs in the original, the number of the original It is possible to determine whether or not the original document could not be sent.

[0003]

However, the above-mentioned facsimile apparatus requires a structure for recording all or a part of the transmission original, and the sender must confirm all the transmission originals. Was complicated and the burden on the sender was large.

The present invention has been made in order to eliminate such disadvantages, and an object thereof is to automatically detect the conveyance of non-standard-size sheets or the double feeding of documents with a simple structure.

[0005]

A document reading apparatus according to the present invention stores in advance the vertical length and the horizontal length of various standard sheets, and detects the length of the document in the main scanning direction when reading the document. ,
Check whether or not the fixed-form paper corresponding to the detected length of the original in the main scanning direction is stored in advance, and if the corresponding fixed-form paper is stored in advance, the length corresponding to the sub-scanning direction of the corresponding fixed-form paper The length in the sub-scanning direction of the original is detected at the end of reading the original, and the length corresponding to the sub-scanning direction of the read fixed-size paper and the detected length in the sub-scanning direction are detected. It is determined whether or not the difference is within a certain error range, and the occurrence of double feeding of the document or the document other than the standard paper is detected.

Further, when the fixed-size paper corresponding to the length in the main scanning direction detected at the time of reading the original is not stored in advance, or the length of the read fixed-size paper in the sub-scanning direction and the detected sub-scanning of the original are detected. It is good to output a warning to the user when the difference from the direction length is not within a certain error range.

Further, when a fixed-size sheet corresponding to the length in the main scanning direction detected at the time of reading the original is not stored in advance, or when the read length of the fixed-size sheet in the sub-scanning direction and the detected sub-scan of the original are detected. If the difference from the length in the direction is not within a certain error range, the reading and feeding of the original is interrupted, the number of originals to be read is displayed on the output section, and the user resends the original that has been double-fed. It is desirable to be able to do so.

Further, it is determined whether or not a fixed-size sheet corresponding to the length in the main scanning direction detected at the time of reading the original is stored in advance, and the length of the read-out fixed-size sheet in the sub-scanning direction and the detected sub-side of the original. Switch whether to determine whether the difference with the length in the scanning direction is within a certain error range,
Do not perform the detection operation when reading a document other than standard size paper.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The document reading device is used for reading an image, for example, used in a facsimile device, a copying device, a scanner device, or the like. Detects when documents other than standard size paper are mixed.

The document reading device includes an automatic document feeding device, a reading position sensor, a reading unit, an image storage unit, a paper size storage unit, a main scanning direction length detecting unit, a sub scanning direction length determining unit, a sub scanning direction length detecting unit, and a comparison unit. Means are provided.

The automatic document feeder, the reading position sensor, the reading section, and the storage section perform the reading operation of the original.
When a document reading instruction is input, the automatic document feeder separates the documents one by one and conveys them in order. When the reading position sensor provided at the reading position of the original detects the original conveyed by the automatic original conveying device, the reading unit starts reading the original. The reading unit repeats reading the document until the reading position detection sensor detects the end of the document, and the image data of the document read by the reading unit is stored in the image storage unit.

The paper size storage unit, the main scanning direction length detecting means, the sub scanning direction length determining means, the sub scanning direction length detecting means, and the comparing means define a fixed size in the case where a document double feed occurs and in a document of standard size paper. The detection is performed when documents other than paper are mixed. The paper size storage unit stores in advance the vertical and horizontal lengths of various standard papers. When the reading unit reads the document in the main scanning direction, the main scanning direction length detection unit detects the length of the document in the main scanning direction based on, for example, the result of reading the document in the main scanning direction by the reading unit. When the main scanning direction length detecting means detects the length of the document in the main scanning direction, the sub-scanning direction length determining means detects the size of the fixed-size sheet corresponding to the detected length of the document in the main scanning direction within a certain error range. It is checked whether or not it is stored in the storage unit, and if a standard paper corresponding to the detected length of the original in the main scanning direction is not stored within a certain error range, an original other than the standard paper is conveyed. That is, it is detected that the originals that are overlapped with each other in the main scanning direction are conveyed. Here, the constant error range is determined by the reading accuracy of the reading unit or the like.

When there is a corresponding fixed-size sheet, the sub-scanning direction length determination means reads the length of the corresponding fixed-size sheet corresponding to the sub-scanning direction from the paper size storage section. After that, when the document reading is completed, the sub-scanning direction length detecting means multiplies, for example, the time from the reading position sensor detecting the leading edge of the document to the trailing edge of the document by the document feeding speed of the automatic document feeding device. The length of the document in the sub-scanning direction is detected. The comparison means determines whether or not the difference between the length read by the sub-scanning direction length determination means and the length detected by the sub-scanning direction length detection means is within a certain error range. Detects conveyance of documents other than. Here, the constant error range is also determined by the reading accuracy of the reading unit or the like.

Further, when a double feed of originals occurs, a warning is output from the output unit to notify the user that the double feed occurs.

Further, when double feeding of originals occurs, the reading and conveying of the originals are interrupted, and the number of read originals read until the occurrence of double feeding of originals is displayed from the output section for use. Notify the person of the number of pages of the manuscript that has not been normally read.

Furthermore, it is possible to read an original other than the standard paper by designating from the changeover switch that the occurrence of double feeding of the original is not detected.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a facsimile apparatus incorporating a document reading apparatus according to an embodiment of the present invention. As shown in the figure, the facsimile apparatus includes a main control unit 1, a memory 2, an operation unit 3, an automatic document feeder 4, a reading position sensor 5, a reading unit 6, a compression / expansion unit 7, a transmission unit 8, an output unit 9 and a ROM 1.
Has zero.

The main control unit 1 operates based on a program previously stored in the ROM 10, a main scanning direction length detecting unit 12, a sub scanning direction length determining unit 13, a sub scanning direction length detecting unit 14, and a comparing unit. 15 and counting means 16. The control means 11 controls the entire facsimile apparatus. The main scanning direction length detection means 12 detects the length of the document in the main scanning direction based on, for example, the result of reading the document in the main scanning direction by the reading unit 6. The sub-scanning direction length determining means 13 determines the size of the fixed-size paper corresponding to the length of the document in the main-scanning direction detected by the main-scanning-direction length detecting means 12 within a certain error range.
1 is checked, and if the standard size paper corresponding to the length in the main scanning direction is not stored in the paper size storage unit 21, double feeding of the document occurs or the document of the standard size paper is stored. Judge that the originals other than the standard paper are mixed in the
The control means 11 is notified of that fact. The sub-scanning direction length determining means 13 determines whether the standard size paper corresponding to the length of the document in the main scanning direction detected by the main scanning direction length detecting means 12 within a certain error range is stored in the paper size storage unit 21. , The length corresponding to the sub-scanning direction of the corresponding fixed-size paper is read from the paper size storage unit 21. The sub-scanning direction length detection means 14 multiplies, at the end of document reading, the time from the reading position sensor 5 detecting the leading edge of the document to the trailing edge of the document by the document feeding speed of the automatic document feeder 4. Then, the length of the document in the sub-scanning direction is detected. The comparison unit 15 detects the length corresponding to the sub-scanning direction of the standard size paper read from the paper size storage unit 21 by the sub-scanning direction length determination unit 13 and the length of the document in the sub-scanning direction detected by the sub-scanning direction length detection unit 14. It is determined whether the difference in length between the two is within a certain error range, and if the lengths differ by more than a certain error range, double feed of documents has occurred or the size of the standard paper It is determined that the originals other than the standard size sheets are mixed, and the control means 11 is notified of that fact. The counting means 16 counts the number of read originals.

The memory 2 includes a paper size storage unit 21, a read number storage unit 22, and an image storage unit 23. The paper size storage unit 21 stores in advance the vertical length and the horizontal length of various standard papers such as A4 size standard paper or A3 size standard paper. The read number storage unit 22 stores the number of read originals counted by the counting unit 16. The image storage unit 23 stores the image data of the document read by the reading unit 6. The operation unit 3 inputs an instruction to start reading a document. Further, the operation unit 3 is provided with a changeover switch 31 for inputting whether or not the occurrence of double feeding of documents is detected. The automatic document feeder 4 separates the documents stacked on a document table (not shown) one by one and conveys them in order. The reading position sensor 5 is installed at the document reading position of the reading unit 6 and detects the presence or absence of a document at the document reading position. The reading unit 6 includes, for example, a CCD sensor, and reads an image on a document. The compression / expansion unit 7 compresses the image data of the document read by the reading unit 6 and stores it in the image storage unit 23. The transmission unit 8 transmits the image data stored in the image storage unit 23 via, for example, a communication line. The output unit 9 is composed of, for example, an LCD, and displays and outputs a warning when multiple feeding of documents occurs. The ROM 10 stores programs and the like for controlling the operation of the main controller 1.

The operation of reading an image with the facsimile apparatus having the above configuration will be described with reference to the flowchart of FIG.

When the user inputs an instruction to read an image from a document from the operation unit 3 (step S1), the main control unit 1 instructs the automatic document feeder 4 to convey the document. When the automatic document feeder 4 receives an instruction to feed a document from the main controller 1, it separates the documents stacked on the document table one by one and sequentially conveys them (step S2). When the document is conveyed to the document reading position of the reading unit 6 by the automatic document feeder 4 and the reading position sensor 5 detects the leading end of the document, the reading unit 6 starts reading the document (step S3), and the main control unit. The first sub-scanning direction length detecting means 14 starts measuring the time during which the document is conveyed. When the reading unit 6 reads the document in the main scanning direction, the main scanning direction length detecting means 12 of the main control unit 1 causes the reading unit 6 to read.
The length of the document in the main scanning direction is detected from the document reading result (step S4). The main scanning direction length detection means 12 may detect the length of the document in the main scanning direction from the result of reading the first line of the document by the reading unit 6, or the length obtained from the results of reading the documents of a plurality of lines. Alternatively, the length may be averaged and detected as the length in the main scanning direction. Further, a plurality of document detection sensors for detecting the presence / absence of a document may be provided so as to cross the document conveyance path, and the main scanning direction length detection means 12 may detect the length in the main scanning direction from the detection result of the document detection sensor. .

When there is an error between the length of the original in the main scanning direction detected by the main scanning direction length detecting means 12 and the actual length of the original in the main scanning direction due to the reading accuracy of the reading unit 6 or the skew of the original. Therefore, the sub-scanning direction length determining means 13 has a fixed shape corresponding to the length in the main scanning direction of the document detected by the main scanning direction length detecting means 12 within a certain error range determined by the accuracy of the reading unit 6 and the like. Paper is stored in the paper size storage unit 21.
Search from When the corresponding fixed-size paper cannot be found from the paper size storage unit 21, the sub-scanning direction length determination means 13 notifies the comparison means 15 and the control means 11 (step S5). In this way, it detects whether there is a standard paper corresponding to the length of the detected original in the main scanning direction.Therefore, with a simple configuration, the originals other than the standard paper or the originals that are misaligned in the main scanning direction are conveyed. Can be detected.

When the control means 11 receives the notification that the corresponding fixed-size sheet could not be found, for example, a warning is displayed from the output section 9 and the reading of the original is stopped (step S6). In this way, the warning is displayed when the length of the document in the main scanning direction does not correspond to the standard size paper, so that the user can know the occurrence of double feeding or the like. If there is a buzzer or an LED for warning, a warning may be given via the buzzer or LED.

The corresponding standard size paper is stored in the paper size storage unit 21.
If it is possible to find out from the paper size storage unit 21, the sub-scanning direction length determination unit 13 reads out the length corresponding to the found sub-scanning direction of the fixed-size paper from the paper size storage unit 21.
5 is notified of the read length. For example, the length of the document in the main scanning direction detected by the main scanning direction length detecting means 12 is A4.
If the size of the size paper is the vertical length, the corresponding fixed-size paper is the A4 size or B4 size paper, so the sub-scanning direction length determination means 13 determines the A4 size horizontal length and the B4 size vertical length. It is read from the paper size storage unit 21. After that, when the reading position sensor 5 detects the trailing edge of the document,
The reading unit 6 finishes reading the original, and the sub-scanning direction length detecting means 14 detects the time from when the reading position sensor 5 detects the leading end of the original to the end of the original (step S7). . A timer or the like inside the main control unit 1 is used to detect the time from when the reading position sensor 5 detects the leading edge of the document to when it detects the end of the document by the sub-scanning direction length detecting means 14. Alternatively, a timer or the like outside the main controller 1 may be used.

The sub-scanning direction length detecting means 14 sub-scans the original document based on, for example, the time from the detection of the leading edge of the original document by the reading position sensor 5 to the detection of the end of the original document and the original document conveyance speed of the automatic original document feeder 4. The length in the direction is detected (step S
8). The comparing means 15 compares the length corresponding to the sub-scanning direction of the standard size paper read by the sub-scanning direction length determining means 13 from the paper size storage section 21 and the length of the document in the sub-scanning direction detected by the sub-scanning direction length detecting means 14. By comparing, it is determined whether or not the difference between the two lengths is within a certain error range determined by the accuracy of the reading unit 6 and the like. Occurs or the originals of the standard size sheets are mixed with originals other than the standard size sheets, and the control means 11 is notified of this (step S9).
1 outputs a warning from the output unit 9 (step S).
6).

The comparison means 15 is a sub-scanning direction length determination means 13.
The difference between the length of the specified sheet read from the sheet size storage unit 21 in the sub-scanning direction and the length of the document in the sub-scanning direction detected by the sub-scanning direction length detecting unit 14 is the reading unit 6 and the automatic document feeder 4. If it is determined that the document is within a certain error range determined by the accuracy, the main control unit 1 detects the presence or absence of the next document, and if there is the next document, the above operation (steps S2 to S10) is performed. repeat. in this way,
A warning is displayed when the detected vertical and horizontal lengths of the original do not match the lengths of the standard-size paper, so that the user can easily know that multiple feeding of the originals has occurred.

Next, as another embodiment, the operation of the facsimile apparatus for interrupting the reading and feeding of the document and displaying the number of pages of the document being read when a double feed or the like is detected will be described with reference to FIG.
This will be described with reference to the flowchart of FIG.

When the user inputs a document reading instruction from the operation section 3 (step S11), the counting means 1 of the main control section 1 is entered.
Reference numeral 6 clears the page number of the original document stored in the read number storage unit 21 of the memory 2 to zero (step S12). Counting means 1
After 6 clears the read number storage section 21 of the memory 2 to zero, the automatic document feeder 4 separates the documents stacked on the document table one by one and sequentially conveys them (step S13). After that, the counting means 16 adds 1 to the page number of the original document stored in the read number storage unit 21 (step S14). After that, the facsimile machine repeats the reading of the original and the inspection of the original size as described in the above embodiment (step S
13 to S21), every time the document starts to be conveyed (step S13), 1 is added to the page number of the document stored in the number-of-reads storage unit 21 (step S14).

When the length of the original in the main scanning direction detected by the main scanning direction length detecting means 12 does not correspond to the standard size paper within a certain error range (step S17), and the detected length of the original in the sub scanning direction. If the length does not match the length corresponding to the sub-scanning direction of the standard size paper within a certain error range (step S20), the control means 11 displays the page number stored in the read number storage section 21 from the output section 9. The user is warned (step S22), and the reading unit 6 and the automatic document feeder 4 are instructed to interrupt the reading and feeding of the document (step S23).
As a result, the user can easily know the page number of the document in which the double feed or the like has occurred.

After that, when the user places an original having a page number equal to or larger than the page number displayed on the output section 9 on the original table and gives an instruction to read the original again (step S24), the facsimile machine performs the above operation (steps S12-). Repeat S21). In this way, the user can restart reading from the page that occurred when multiple feeding of documents occurred, so it is not necessary to reload the document from the beginning, and the processing when multiple feeding occurs It can be performed easily and quickly.

In some cases, such as when reading a document other than the standard size paper, it is better not to perform the document size inspection. Therefore, the changeover switch 31 may be used to prevent the double feed from being detected.

Further, in the above embodiment, the changeover switch 31
Although it is provided in the operation unit 3, it may be provided in a place other than the operation unit 3.

Further, the change-over switch 31 may be an internal switch which is switched according to the mode setting from the operation section 3 or the like.

In the above embodiment, the case where the automatic document feeder 4 is provided has been described, but the automatic document feeder 4 is described.
It may be a facsimile machine that does not have a printer.

The main scanning direction length detecting means 12 may detect the length of the document in the main scanning direction and the position of the document to detect that the document is not set correctly.

Further, in the above embodiment, the sub-scanning direction length detecting means 14 detects the time from when the reading position sensor 5 detects the leading edge of the document to when it detects the trailing edge of the document and the document of the automatic document feeder 4. The length of the document in the sub-scanning direction was detected from the transport speed.The number of scanning lines was counted, and the number of scanning lines counted and the distance between the scanning lines were multiplied to determine the length of the document in the sub-scanning direction. You may detect.

In the above embodiment, the main scanning direction length detecting means 12, the sub scanning direction length determining means 13, the sub scanning direction length detecting means 14, the comparing means 15 and the counting means 16 are provided inside the main control section 1. However, it may be provided outside the main control unit 1.

[0038]

As described above, the present invention detects the length of a document in the main scanning direction when reading the document in the main scanning direction.
The length in the sub-scanning direction corresponding to the detected length in the main-scanning direction is read out from the length of the fixed-form paper stored in advance,
The length of the original in the sub-scanning direction is detected at the end of reading the original, and the length of the read original in the sub-scanning direction is compared with the detected length of the original in the sub-scanning direction. It is determined whether or not it is within the range, and if the standard paper corresponding to the length in the main scanning direction detected when reading the original is not stored, or if the length of the read standard paper is detected as the length corresponding to the sub scanning direction. If the difference between the length of the original document in the sub-scanning direction is not within a certain error range, it is determined that the document has double-fed or the document other than the standard paper is read. be able to.

Further, when a fixed form sheet corresponding to the length in the main scanning direction detected at the time of reading the original is not stored, or the length corresponding to the sub scanning direction of the read fixed form sheet and the detected sub scanning direction of the original are detected. A warning is output when the difference from the length of the document is not within a certain error range, so that the user can easily know that the multi-feeding of the document has occurred.

Further, when the number of originals to be read is stored and no fixed form sheet corresponding to the length in the main scanning direction detected at the time of reading the original is stored, or the length of the read fixed form sheet in the sub-scanning direction is stored. If the difference between the detected length and the length of the detected original in the sub-scanning direction is not within a certain error range, reading and feeding of the original are stopped, and the stored number of read originals is output. You can easily re-send the original.

Further, since the changeover switch switches whether or not to perform the multi-feed and the reading of the original other than the fixed size paper when reading the original, it prevents the reading operation from being disturbed when the original other than the fixed size paper is read. it can.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the facsimile apparatus.

FIG. 3 is a flowchart showing the operation of a facsimile apparatus of another embodiment.

[Explanation of reference numerals] 21 paper size storage unit 22 read number storage unit 4 automatic document feeder 5 reading position sensor 6 reading unit 12 main scanning direction length detection unit 13 sub-scanning direction length determination unit 14 sub-scanning direction length detection unit 15 comparison Means 16 Counting means

Claims (4)

[Claims] 1. The vertical and horizontal lengths of various standard sheets are stored in advance, the length of the document in the main scanning direction is detected when reading the document, and the detected length of the document in the main scanning direction is supported. Check whether or not the specified fixed size paper is stored in advance, and when the corresponding fixed size paper is stored in advance, read the length corresponding to the sub-scanning direction of the corresponding fixed size paper, and at the end of the original reading, the original sub scanning Direction length is detected, the length corresponding to the read standard paper in the sub-scanning direction is compared with the detected length in the sub-scanning direction, and the difference in the length in the sub-scanning direction of the document is within a certain error range. An original reading device characterized by determining whether or not it is inside. 2. When the fixed-form paper corresponding to the length in the main scanning direction detected at the time of reading the original is not stored in advance, or the length of the read fixed-form paper in the sub-scanning direction and the detected sub-scan of the original are detected. The document reading apparatus according to claim 1, wherein a warning is output when the difference from the length in the direction is not within a certain error range. 3. When the fixed-size paper corresponding to the length in the main scanning direction detected at the time of reading the original is not stored in advance, or when the read length of the fixed-size paper and the detected original scanning in the sub-scanning direction 2. The document reading device according to claim 1, wherein when the difference from the length in the direction is not within a certain error range, reading and feeding of the document are interrupted and the number of read documents is displayed. 4. Whether or not a fixed-size sheet corresponding to the length in the main scanning direction detected at the time of reading an original is stored in advance, and the length of the read fixed-size sheet in the sub-scanning direction and the detected original of the original The document reading apparatus according to claim 1, wherein whether or not to determine whether or not a difference from the length in the scanning direction is within a certain error range is switched.