JP4693162B2 - Double feed detection device and double feed detection method - Google Patents

Double feed detection device and double feed detection method Download PDF

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JP4693162B2
JP4693162B2 JP2005262802A JP2005262802A JP4693162B2 JP 4693162 B2 JP4693162 B2 JP 4693162B2 JP 2005262802 A JP2005262802 A JP 2005262802A JP 2005262802 A JP2005262802 A JP 2005262802A JP 4693162 B2 JP4693162 B2 JP 4693162B2
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繁 小須田
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Canon Electronics Inc
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Description

本発明は、磁気印刷用に指定された領域を有するシートを搬送する際、シートの重送を検知する重送検知装置及び重送検知方法に関する。 The present invention relates to a double feed detection device and a double feed detection method for detecting double feed of a sheet when a sheet having an area designated for magnetic printing is conveyed.

シートに印刷された画像を読み取るシートフィード型のスキャナには、複数枚のシートが重なったまま搬送され（以下、重送という）、シート毎の画像情報が欠落することを防止するための光透過型の重送検知装置が組み込まれているものがある。   A sheet feed type scanner that reads an image printed on a sheet is transported in a state where a plurality of sheets are overlapped (hereinafter referred to as “multiple feeding”), and transmits light to prevent image information for each sheet from being lost. Some types have a built-in multifeed detector.

この重送検知装置の構成は、搬送路を挟んで発光部と受光部を対向配置させ、発光部からの光をシートに照射し、シートからの透過光を受光部にて受光する。この重送検知装置では、シート１枚を透過した透過光の透過光量に比べ、重送時にシート複数枚を透過した透過光の透過光量の方が少ないことを利用し、シート１枚を透過したときの透過光量とシート２枚を透過したときの透過光量の間に重送検知レベルを設け、重送検知レベルより透過光量が少なかった場合を重送と判断する。   In the configuration of the double feed detection device, the light emitting unit and the light receiving unit are arranged to face each other across the conveyance path, light from the light emitting unit is irradiated onto the sheet, and transmitted light from the sheet is received by the light receiving unit. In this multifeed detection device, the amount of transmitted light transmitted through a plurality of sheets during multifeed is less than the amount of transmitted light transmitted through one sheet, and transmitted through one sheet. A double feed detection level is provided between the transmitted light amount at that time and the transmitted light amount when the two sheets are transmitted, and the case where the transmitted light amount is less than the double feed detection level is determined as double feed.

また、透過光量はシート厚以外にシート上の印刷・印字等によっても減少することが知られている。   Further, it is known that the amount of transmitted light is reduced not only by the sheet thickness but also by printing / printing on the sheet.

透過光量の減少の要因が、重送に起因するものか又は印刷に起因するものかの判別は困難であるため、重送と印刷とを判別する手段として、透過光量が重送検知レベルより少ない状態が所定時間以上連続した場合を重送と判断する方法が知られている（特許文献１参照）。   Since it is difficult to determine whether the cause of the decrease in transmitted light amount is due to double feed or printing, the transmitted light amount is less than the double feed detection level as a means for discriminating between double feed and printing. A method is known in which a case where a state continues for a predetermined time or more is determined as double feeding (see Patent Document 1).

図８は、従来のチェックスキャナに組み込まれている重送検知装置の概略構成を示す図である。   FIG. 8 is a diagram showing a schematic configuration of a double feed detection device incorporated in a conventional check scanner.

この重送検知装置は、小切手や手形等のチェック１に対し光を照射する発光部２と、チェック１を透過した光を受光する受光部３と、発光部２に対し光を照射するタイミングを指示する信号を出力すると共に受光部３からの受光出力値（透過光量の値）を入力するＣＰＵ４とを備えている。発光部２と受光部３とはＣＰＵ４に接続されている。   This double feed detection device includes a light emitting unit 2 that emits light to a check 1 such as a check or bill, a light receiving unit 3 that receives light transmitted through the check 1, and a timing at which light is emitted to the light emitting unit 2. And a CPU 4 that outputs an instructing signal and inputs a light reception output value (value of transmitted light amount) from the light receiving unit 3. The light emitting unit 2 and the light receiving unit 3 are connected to the CPU 4.

図９は、チェック１と、発光部２及び受光部３との位置関係を示す図である。   FIG. 9 is a diagram illustrating a positional relationship between the check 1 and the light emitting unit 2 and the light receiving unit 3.

チェック１は、ＭＩＣＲ（Magnetic Ink Character Recognition）という磁気印字の文字列によって金融機関や金額の情報を書き込むクリアバンド１ａと、通常のペン等で金額やサインを記入する非クリアバンド１ｂとで構成されている。クリアバンド１ａは、地色や地模様の印刷以外は他の不特定の印刷がされない領域と定められている。   Check 1 is composed of a clear band 1a for writing information on financial institutions and monetary amounts by a magnetic character string called MICR (Magnetic Ink Character Recognition), and a non-clear band 1b for entering monetary amounts and signatures with a normal pen or the like. ing. The clear band 1a is defined as an area where other unspecified printing is not performed other than printing of the ground color and the ground pattern.

同図において、５は発光部２及び受光部３が配置されている位置の一例を示し、発光部２及び受光部３が非クリアバンド１ｂに対向する。位置５に配された受光部３は図中の破線で示した部分の透過光７を受光し、重送検知が実行される。６は発光部２及び受光部３が配置されている位置の別例を示し、発光部２及び受光部３がクリアバンド１ａに対向する。位置６に配された受光部３は図中の破線で示した部分の透過光８を受光し、重送検知が実行される。   In the same figure, 5 shows an example of the position where the light emission part 2 and the light-receiving part 3 are arrange | positioned, and the light emission part 2 and the light-receiving part 3 oppose the non-clear band 1b. The light receiving unit 3 arranged at the position 5 receives the transmitted light 7 in the portion indicated by the broken line in the figure, and double feed detection is executed. 6 shows another example of the position where the light emitting unit 2 and the light receiving unit 3 are arranged, and the light emitting unit 2 and the light receiving unit 3 face the clear band 1a. The light receiving unit 3 disposed at the position 6 receives the transmitted light 8 in the portion indicated by the broken line in the drawing, and double feed detection is executed.

図１０は、クリアバンド１ａの拡大図である。   FIG. 10 is an enlarged view of the clear band 1a.

同図において、１１は、チェック１を透過した光を検出する受光部３の透過光検出部であり、１２はＭＩＣＲ印字である。透過光検出部１１はＭＩＣＲ印字の一文字の大きさと略同一である。   In the figure, reference numeral 11 denotes a transmitted light detection unit of the light receiving unit 3 that detects light transmitted through the check 1, and 12 denotes MICR printing. The transmitted light detection unit 11 is substantially the same as the size of one character of MICR printing.

図１１は、発光部２及び受光部３が図９の位置６に配置された場合のチェック搬送時の受光出力波形を示す図である。   FIG. 11 is a diagram showing a light reception output waveform at the time of check conveyance when the light emitting unit 2 and the light receiving unit 3 are arranged at the position 6 in FIG.

図１１の受光出力波形は、ＭＩＣＲ印字部分及びＭＩＣＲ印字間部分の受光出力が常に重送検知レベルを下回っており、当該重送検知レベルを下回る時間が既定長以上連続するため、重送と誤検知される。   The received light output waveform of FIG. 11 is an error due to a double feed because the received light output of the MICR printing part and the part between MICR printing is always below the double feed detection level and the time below the double feed detection level continues for a predetermined length or more. Detected.

ＭＩＣＲ印字間は印刷が無い領域であるのに、受光出力が重送検知レベルを下回ってしまう原因は、図１０のように、透過光検出部１１の大きさがＭＩＣＲ印字１２の文字の大きさに接近した状態にあり、かつ透過光検出部１１の大きさがＭＩＣＲ印字１２とこれに隣接するＭＩＣＲ印字１２との間の余白よりも大きいため、ＭＩＣＲ印字間の余白が透過光検出部１１の真上に移動した時点においても当該余白を透過した光だけではなく、ＭＩＣＲ印字１２の部分の透過光も含まれた光を受光してしまい、透過光がＭＩＣＲ印字１２により遮蔽される割合が増すためである。   The reason why the received light output falls below the double feed detection level even though there is no printing during MICR printing is that the size of the transmitted light detection unit 11 is the size of the characters on the MICR printing 12, as shown in FIG. And the size of the transmitted light detection unit 11 is larger than the margin between the MICR print 12 and the MICR print 12 adjacent to the MICR print 12. Even when moving right above, not only the light transmitted through the margin but also the light including the transmitted light of the portion of the MICR print 12 is received, and the rate at which the transmitted light is shielded by the MICR print 12 increases. Because.

図１２は、チェック１と、発光部２及び受光部３との位置関係を示す図である。   FIG. 12 is a diagram illustrating a positional relationship between the check 1 and the light emitting unit 2 and the light receiving unit 3.

図１２では、発光部２及び受光部３が非クリアバンド１ｂに対向する位置５に配置されており、発光部２は印刷された金額記入欄に対し光を照射し、受光部３はその透過光を受光する。   In FIG. 12, the light emitting unit 2 and the light receiving unit 3 are arranged at a position 5 facing the non-clear band 1b. The light emitting unit 2 irradiates the printed amount entry column and the light receiving unit 3 transmits the light. Receives light.

図１３は、発光部２及び受光部３が図１２の位置５に配置された場合のチェック搬送時の受光出力波形を示す図である。   FIG. 13 is a diagram showing a light reception output waveform at the time of check conveyance when the light emitting unit 2 and the light receiving unit 3 are arranged at the position 5 in FIG.

図１３の受光出力波形は、印刷された金額記入欄部分の受光出力が常に重送検知レベルを下回っており、当該重送検知レベルを下回る時間が既定長以上連続するため、重送と誤検知される。   The received light output waveform of FIG. 13 is that the received light output in the printed money amount entry field portion is always below the double feed detection level, and the time below the double feed detection level continues for a predetermined length or more. Is done.

このような誤検知に対処する方法として、前記既定長を長くし、印刷の連続を重送と誤検知しにくくする方法がある。   As a method of dealing with such erroneous detection, there is a method of making the predetermined length longer and making it difficult to erroneously detect continuous printing as double feeding.

図１４は、２枚のチェックが重送される状態を示す図であり、図１５は、図１４のチェック重送時の受光出力波形を示す図である。   FIG. 14 is a diagram showing a state in which two checks are double-fed, and FIG. 15 is a diagram showing a light reception output waveform at the time of double check feeding in FIG.

図１５の受光出力波形は、重送部分の受光出力が重送レベルを下回る時間が既定長より短いので、この場合には、重送であるにもかかわらず重送でないと誤検知されてしまう。
特開昭６１−０３７６４４号公報 The light reception output waveform in FIG. 15 is erroneously detected as a double feed even though it is a double feed because the time during which the light reception output of the double feed portion falls below the double feed level is shorter than the predetermined length. .
JP 61-037644 A

以上のように、従来の重送検知装置では、発光部２及び受光部３をクリアバンド１ａ及び非クリアバンド１ｂのいずれに対向する位置に配置しても、誤検知が生じる可能性がある。   As described above, in the conventional double feed detection device, erroneous detection may occur even if the light emitting unit 2 and the light receiving unit 3 are arranged at positions facing either the clear band 1a or the non-clear band 1b.

本発明の目的は、シートの重送の検知を精度良く実行することができる重送検知装置及び重送検知方法を提供することにある。 An object of the present invention is to provide a double feed detection device and a double feed detection method capable of accurately detecting the double feed of sheets.

上記目的を達成するため、本発明による重送検知装置は、搬送路に沿って搬送されるシートの所定領域に光を照射する発光手段と、前記搬送路を挟み前記発光手段と対向する位置に配置され、前記シートの所定領域からの透過光を受光する受光手段と、前記発光手段と前記受光手段との間に配置され、前記発光手段が照射する光及び前記受光手段が受光する光の光束の少なくともいずれか一方を狭める光束制限手段と、前記受光手段からの出力に基づいて、前記搬送路に沿って搬送されるシートが重送であるか否かの判断を行う判断手段とを備え、前記光束制限手段は、前記シートの所定領域に印字される文字間の幅と略同等か当該文字間の幅を越えない範囲に前記光束を狭めており、前記判断手段は、前記受光手段からの出力が重送検知レベルに達した状態にあり、且つその状態が所定値以上連続した場合に重送と判断することを特徴とする。
また、本発明による重送検知方法は、搬送路に沿って搬送されるシートの重送を検知するための重送検知装置で用いられる重送検知方法であって、発光部が前記搬送路に沿って搬送されるシートの所定領域に光を照射する第１のステップと、前記発光部と前記搬送路を挟んで前記発光部に対向する位置に配置された受光部との間に配置された光束制限部が前記シートの所定領域に印字される文字間の幅と略同等か当該文字間の幅を越えない範囲に光束を狭める第２のステップと、前記受光部が前記シートの所定領域からの透過光を受光する第３のステップと、判断部が前記受光部からの出力が重送検知レベルに達した状態にあり、且つその状態が所定値以上連続した場合に重送と判断する第４のステップとを有することを特徴とする。 In order to achieve the above object, a multifeed detection device according to the present invention includes a light emitting means for irradiating light to a predetermined area of a sheet conveyed along a conveyance path, and a position facing the light emission means across the conveyance path. A light receiving means for receiving transmitted light from a predetermined area of the sheet, and a light flux arranged between the light emitting means and the light receiving means, and emitted by the light emitting means and light received by the light receiving means. A light flux limiting unit that narrows at least one of the light source, and a determination unit that determines whether or not the sheet conveyed along the conveyance path is double-feed based on an output from the light receiving unit, The luminous flux limiting means narrows the luminous flux to a range that is substantially equal to or not exceeding the width between characters printed in a predetermined area of the sheet, and the judging means The output is double feed detection It is in a state of reaching the Le, and its state is characterized in that it is determined that double feed is consecutively more than a predetermined value.
A multifeed detection method according to the present invention is a multifeed detection method used in a multifeed detection device for detecting multifeed of a sheet conveyed along a conveyance path, wherein a light emitting unit is disposed on the conveyance path. Arranged between a first step of irradiating a predetermined area of the sheet conveyed along the light receiving unit and a light receiving unit disposed at a position facing the light emitting unit across the conveying path A second step of narrowing the light flux within a range in which the light flux restricting portion is substantially equal to or not exceeding a width between characters printed in the predetermined region of the sheet; and the light receiving portion is moved from the predetermined region of the sheet. A third step for receiving the transmitted light, and a determination unit that determines that the double-feed is detected when the output from the light-receiving unit has reached the double-feed detection level and the state continues for a predetermined value or more. And 4 steps.

本願発明によれば、発光手段が照射する光及び前記受光手段が受光する光の光束の少なくともいずれか一方を狭められ、受光手段からの出力が重送検知レベルに達した状態にあり、且つその状態が所定値以上連続した場合に重送と判断される。これにより、重送していない場合は一枚のシートの印字とこれに隣接する印字との間の余白部分（印字間）を透過した光のみの受光が可能となり、重送時に２枚のシートの印字の無い部分を透過した光を受光する場合に比べても十分に大きな受光出力が得られ、重送でないことの判断が容易にできる。よって、シートの重送の検知を精度良く実行することができる。   According to the present invention, at least one of the light emitted by the light emitting means and the light flux of the light received by the light receiving means is narrowed, and the output from the light receiving means has reached a double feed detection level, and When the state continues for a predetermined value or more, it is determined to be double feeding. As a result, when there is no double feeding, it is possible to receive only light that has passed through the margin (between printing) between the printing of one sheet and the printing adjacent to it. A sufficiently large light receiving output can be obtained as compared with the case where light transmitted through a portion without printing is received, and it can be easily determined that it is not double feeding. Therefore, it is possible to accurately detect the double feeding of sheets.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は、本実施の形態に係る重送検知装置の概略構成を示す図である。   FIG. 1 is a diagram showing a schematic configuration of a double feed detection device according to the present embodiment.

この重送検知装置は、チェックスキャナに組み込まれており、小切手や手形等のチェック１０１に対し光を照射する発光部１０２と、チェック１０１を透過した光を受光する受光部１０３と、発光部１０２から照射された光の光束を狭めるため、不要な光を遮光するスリット部材１０４と、制限したい範囲の外に回り込んだ光、例えばチェック内外部で乱反射をして受光部１０３に辿り着く光を遮光するためのスリット部材１０５と、発光部１０２に対し光を照射するタイミングを指示する信号を出力すると共に受光部１０３からの受光出力値（透過光量の値）を入力するＣＰＵ１０６とを備えている。発光部１０２と受光部１０３とはＣＰＵ１０６に接続されている。   This double feed detection device is incorporated in a check scanner, and a light emitting unit 102 that emits light to a check 101 such as a check or bill, a light receiving unit 103 that receives light transmitted through the check 101, and a light emitting unit 102. In order to narrow the luminous flux of the light emitted from the slit member 104, the slit member 104 that shields unnecessary light and the light that circulates outside the range to be restricted, for example, the light that reaches the light receiving unit 103 by irregular reflection inside and outside the check A slit member 105 for shielding light, and a CPU 106 for outputting a signal for instructing the timing of irradiating light to the light emitting unit 102 and inputting a light reception output value (value of transmitted light amount) from the light receiving unit 103 are provided. . The light emitting unit 102 and the light receiving unit 103 are connected to the CPU 106.

発光部１０２は、チェック１０１に照射する光の光束を狭めるためのレンズや、チェック１０１に照射する光の光源としてレーザー光源のような細い光束の平行光光源を備えていてもよい。この場合、スリット部材を省略してもよい。   The light emitting unit 102 may include a lens for narrowing the light beam irradiated to the check 101, and a thin parallel light source such as a laser light source as a light source for the light irradiated to the check 101. In this case, the slit member may be omitted.

スリット部材１０４及び１０５のスリットの幅はＭＩＣＲ文字と後続のＭＩＣＲ文字との間の余白と略同等かそれ以下のサイズにする。   The width of the slits of the slit members 104 and 105 is set to be approximately equal to or less than the margin between the MICR character and the subsequent MICR character.

図１では、スリット部材１０４，１０５の２種類の光束制限手段を設けたが、１種類のみでも良く、また図３のように、スリット部材１０４，１０５にスリット部材１０４’，１０５’を重ね合わせるように設置して、スリット部材を複数設けてもよい。これにより、スリットの幅をＭＩＣＲ文字と後続のＭＩＣＲ文字との間の余白と略同等かそれ以下のサイズにする。   In FIG. 1, two types of light flux limiting means, slit members 104 and 105, are provided. However, only one type may be used, and slit members 104 ′ and 105 ′ are overlapped with slit members 104 and 105 as shown in FIG. A plurality of slit members may be provided. As a result, the width of the slit is set to a size approximately equal to or smaller than the margin between the MICR character and the subsequent MICR character.

さらに、図２のように、スリット部材１０４，１０５のスリット幅を調整するための駆動部１０７及びスリット部材１０４，１０５のスリット幅を設定するための操作部１０８をＣＰＵ１０６に接続するようにしてもよい。この場合、操作部１０８で設定されたスリット幅の値に基づいて、ＣＰＵ１０６が駆動部１０７にスリット部材１０４，１０５を駆動する信号を出力する。これにより、駆動部１０７が操作部１０８で設定されたスリット幅の値になるようにスリット部材１０４，１０５をチェック１０１の搬送方向と平行に移動させる。この結果、スリットの幅をＭＩＣＲ文字と後続のＭＩＣＲ文字との間の余白と略同等かそれ以下のサイズにすることができる。   Further, as shown in FIG. 2, a driving unit 107 for adjusting the slit width of the slit members 104 and 105 and an operation unit 108 for setting the slit width of the slit members 104 and 105 may be connected to the CPU 106. Good. In this case, the CPU 106 outputs a signal for driving the slit members 104 and 105 to the driving unit 107 based on the value of the slit width set by the operation unit 108. As a result, the drive unit 107 moves the slit members 104 and 105 in parallel with the conveyance direction of the check 101 so that the slit width value set by the operation unit 108 is obtained. As a result, the width of the slit can be made substantially equal to or smaller than the margin between the MICR character and the subsequent MICR character.

図４は、チェック１０１と、発光部１０２及び受光部１０３との位置関係を示す図である。   FIG. 4 is a diagram illustrating a positional relationship between the check 101 and the light emitting unit 102 and the light receiving unit 103.

チェック１０１は、ＭＩＣＲ（Magnetic Ink Character Recognition）という磁気印字の文字列によって金融機関や金額の情報を書き込むクリアバンド１０１ａと、通常のペン等で金額やサインを記入する非クリアバンド１０１ｂとで構成されている。クリアバンド１０１ａは、地色や地模様の印刷以外は他の不特定の印刷がされない領域と定められている。図４の２０３は、ＭＩＣＲの印字であり、２０４は発光部１０２及び受光部１０３が配置されている位置の一例を示し、発光部１０２及び受光部１０３がクリアバンド１０１ａに対向する。位置２０４に配された受光部１０３は図中の破線で示した部分の透過光を受光する。このように、常にクリアバンドの位置で重送検知が実行される。   The check 101 is composed of a clear band 101a for writing financial institution and amount information by a magnetic character string called MICR (Magnetic Ink Character Recognition), and a non-clear band 101b for entering the amount and signature with a normal pen or the like. ing. The clear band 101a is defined as an area where other unspecified printing is not performed except for printing of the ground color and the ground pattern. Reference numeral 203 in FIG. 4 denotes MICR printing, 204 denotes an example of a position where the light emitting unit 102 and the light receiving unit 103 are arranged, and the light emitting unit 102 and the light receiving unit 103 face the clear band 101a. The light receiving unit 103 disposed at the position 204 receives the transmitted light of the portion indicated by the broken line in the drawing. In this way, double feed detection is always performed at the position of the clear band.

図５（Ａ）はチェック１０１を重送していない場合のクリアバンド１０１ａの拡大図であり、（Ｂ）はチェック１０１を重送している場合のクリアバンド１０１ａの拡大図である。   FIG. 5A is an enlarged view of the clear band 101a when the check 101 is not double-fed, and FIG. 5B is an enlarged view of the clear band 101a when the check 101 is double-fed.

同図（Ａ），（Ｂ）において、２０３はＭＩＣＲ印字であり、３０１は、光束を狭めるスリットの形状の例であり、照射されてチェック１０１を透過する光束をＭＩＣＲ印字間隔よりも狭い幅の長方形に制限している。図５（Ｂ）では、重送によりＭＩＣＲ印字２０３とＭＩＣＲ印字２０３’とが重なっているため、図示の位置にあるスリット３０１からの照射光は、ＭＩＣＲ印字２０３’を照射する。また、重送の状態によってはＭＩＣＲ印字２０３とＭＩＣＲ印字２０３’は重なりがそろう場合もあり、スリット３０１からの照射光は印字間を透過する可能性もある。   In FIGS. 9A and 9B, reference numeral 203 denotes MICR printing, and 301 is an example of a slit shape for narrowing the light beam. The light beam that is irradiated and transmitted through the check 101 has a width narrower than the MICR printing interval. Restricted to a rectangle. In FIG. 5B, since the MICR print 203 and the MICR print 203 'are overlapped by double feeding, the irradiation light from the slit 301 at the illustrated position irradiates the MICR print 203'. Further, depending on the double feed state, the MICR print 203 and the MICR print 203 'may overlap each other, and the irradiation light from the slit 301 may be transmitted between the prints.

図６（Ａ）は、チェック１０１を重送していない場合の受光出力波形を示す図であり、（Ｂ）は、チェック１０１を重送している場合の受光出力波形を示す図である。   FIG. 6A is a diagram illustrating a light reception output waveform when the check 101 is not double-fed, and FIG. 6B is a diagram illustrating a light reception output waveform when the check 101 is double-fed.

本実施の形態に係る重送検知装置では、透過光量が多いほど受光出力が大きくなるように構成してあり、重送検知レベルを下回る受光出力となったときに重送検知レベルに達したとする。逆に、透過光量が少ないほど受光出力が大きくなるような構成も可能であり、この場合は重送検知レベルを上回る受光出力となったときに重送検知レベルに達したとする。ＣＰＵ１０６は、時間のフラグを備え、重送検知レベルに達したと判断したときには、当該時間のフラグを１インクリメントする。   The double feed detection device according to the present embodiment is configured such that the light reception output increases as the amount of transmitted light increases, and the double feed detection level is reached when the light reception output falls below the double feed detection level. To do. Conversely, it is possible to adopt a configuration in which the received light output increases as the transmitted light amount decreases. In this case, it is assumed that the double feed detection level is reached when the received light output exceeds the double feed detection level. When the CPU 106 has a time flag and determines that the double feed detection level has been reached, the CPU 106 increments the time flag by one.

チェック１０１の搬送中に、図５（Ａ）のようにスリット３０１の位置がＭＩＣＲ印字２０３の字間にきたときは、受光部１０３は印字の影響の無い透過光のみを受光できるので、受光出力は図６（Ａ）の６０１ａのように重送検知レベルを上回る。このため、ＭＩＣＲ印字の一つの文字によってスリットが遮られる時間以上、受光出力が重送検知レベルに達した状態は続かない。即ち、チェック１０１を重送していない場合は、図６（Ａ）の６０１ａのように受光出力が重送検知レベルに達しない状態が周期的に現れる。   If the position of the slit 301 is between the characters of the MICR print 203 as shown in FIG. 5A during the transport of the check 101, the light receiving unit 103 can receive only the transmitted light that is not affected by the print. Exceeds the double feed detection level as indicated by 601a in FIG. For this reason, the state where the light reception output reaches the double feed detection level does not continue for a time longer than the time when the slit is blocked by one character of MICR printing. That is, when the check 101 is not double-fed, a state in which the light reception output does not reach the double-feed detection level periodically appears as indicated by 601a in FIG.

一方、チェック１０１が重送されている場合は、図５（Ｂ）のようにスリット３０１の位置はＭＩＣＲ印字２０３の字間にきても、受光部１０３はＭＩＣＲ印字２０３’の影響がある透過光のみを受光するので、受光出力は重送時受光出力値を大幅に下回る。また、図５（Ｂ）よりもＭＩＣＲ印字の重なりがそろって重送されている場合、２枚のチェックの字間を透過した光の受光出力は図６（Ｂ）の６０１ｂのように重送時受光出力値と等しくなり、重送検知レベルを上回らない。このため、受光出力が重送検知レベルに達した状態が続く。   On the other hand, when the check 101 is double-fed, even if the slit 301 is positioned between the characters of the MICR print 203 as shown in FIG. Since only light is received, the light reception output is significantly lower than the light reception output value during double feeding. In addition, when MICR printing overlaps more than in FIG. 5B, the light reception output of the light transmitted between the two check characters is double-feeded as indicated by 601b in FIG. 6B. It becomes equal to the received light output value and does not exceed the double feed detection level. For this reason, the state in which the light reception output reaches the double feed detection level continues.

このように、ＣＰＵ１０６は、受光出力に基づいて重送であるか否かを判断でき、ＭＩＣＲの印字列を誤って重送と判別することを回避できる。   As described above, the CPU 106 can determine whether or not the double feed is based on the light reception output, and can avoid erroneously determining the MICR print string as the double feed.

図７は、ＣＰＵ１０６で実行される重送検知の処理を示すフローチャートである。   FIG. 7 is a flowchart showing the double feed detection process executed by the CPU 106.

まず、チェック１０１が搬送中であるか否かを判別する（ステップＳ７１）。ステップＳ７１において、チェック１０１が搬送中でないと判別された場合は、重送検知の処理を実行せず、チェックが搬送されるのを待つ。ステップＳ７１において、チェック１０１が搬送中であると判別された場合は、重送検知を開始する（ステップＳ７２）。   First, it is determined whether or not the check 101 is being conveyed (step S71). If it is determined in step S71 that the check 101 is not being conveyed, the multi-feed detection process is not executed and the check is conveyed. If it is determined in step S71 that the check 101 is being conveyed, double feed detection is started (step S72).

次いで、受光出力が重送検知レベルを下回ったか否かを判別する（ステップＳ７３）。ステップＳ７３において、受光出力が重送検知レベルを下回らなかったと判別された場合、重送検知レベルに達しなかったと判断し、時間のフラグをクリアし（ステップＳ７４）、ステップＳ７１に戻る。   Next, it is determined whether or not the received light output is below the double feed detection level (step S73). If it is determined in step S73 that the received light output has not fallen below the double feed detection level, it is determined that the double feed detection level has not been reached, the time flag is cleared (step S74), and the process returns to step S71.

ステップＳ７３において、受光出力が重送検知レベルを下回ったと判別された場合は、重送検知レベルに達したと判断し、時間のフラグを１インクリメントする（ステップＳ７５）。   If it is determined in step S73 that the received light output has fallen below the double feed detection level, it is determined that the double feed detection level has been reached, and the time flag is incremented by 1 (step S75).

その後、重送検知レベルに達した状態が既定長（既定時間）以上連続したか否かを判別する（ステップＳ７６）。この判別は、時間のフラグが所定値以上になっているか否かにより判別され、所定値以上である場合には、重送検知レベルに達した状態が既定長以上連続したと判別され、所定値未満である場合には、重送検知レベルに達した状態が既定長以上の連続にまだ達していないと判別される。   Thereafter, it is determined whether or not the state that has reached the double feed detection level has continued for a predetermined length (predetermined time) or more (step S76). This determination is made based on whether or not the time flag is greater than or equal to a predetermined value. If the time flag is greater than or equal to a predetermined value, it is determined that the state where the double feed detection level has been reached has continued for a predetermined length or longer. If it is less than this, it is determined that the state where the double feed detection level has been reached has not yet reached a predetermined length or more.

ステップＳ７６において、重送検知レベルに達した状態が既定長以上の連続にまだ達していないと判別された場合は、次の受光出力を待つために、ステップＳ７１に戻る。ステップＳ７６において、重送検知レベルに達した状態が既定長以上連続したと判別された場合は、搬送中のチェック１０１が重送であると判断し（ステップＳ７７）、本処理を終了する。   If it is determined in step S76 that the double feed detection level has not yet reached the predetermined length or more, the process returns to step S71 to wait for the next light reception output. If it is determined in step S76 that the state of reaching the double feed detection level has continued for a predetermined length or longer, it is determined that the check 101 being transported is double feed (step S77), and the process is terminated.

本実施の形態では、上記既定長は時間で規定しているが、チェック１０１を搬送する距離として規定しても良い。また搬送機構をステッピングモータで駆動している場合、当該ステッピングモータのステップ数やステップパルス数で規定してもよい。   In the present embodiment, the predetermined length is defined by time, but may be defined as a distance for transporting the check 101. Further, when the transport mechanism is driven by a stepping motor, it may be defined by the number of steps or the number of step pulses of the stepping motor.

また、上記実施の形態では、発光部１０２がチェック１０１のクリアバンド１０１ａ、即ち、チェック１０１の表面に対して光を照射しているが、これに限定するものではなく、クリアバンド１０１ａが構成されている部分に対してチェック１０１の裏面から光を照射してもよい。   Moreover, in the said embodiment, although the light emission part 102 is irradiating light with respect to the clear band 101a of the check 101, ie, the surface of the check 101, it is not limited to this, The clear band 101a is comprised. You may irradiate light from the back surface of the check 101 with respect to the part.

以上説明したように、本実施の形態によれば、発光部１０２及び受光部１０３をクリアバンド１０１ａに対向する位置に設け、スリットの幅をＭＩＣＲ文字と後続のＭＩＣＲ文字との間の余白と略同等かそれ以下のサイズにしたスリット部材１０４，１０５を発光部１０２と受光部１０３との間に設け、受光出力が重送検知レベルに達した状態が既定長以上連続した場合に、搬送中のチェック１０１が重送であると判断される。これにより、チェック１０１が重送なく搬送され、ＭＩＣＲ文字の間の余白部分（印字間）にスリットが対向する位置まで移動した時点では印字間を透過した光のみの受光が可能となり、重送時に２枚のチェック１０１のＭＩＣＲ文字の間の余白部分（印字間）を透過した光を受光する場合に比べても十分に大きな受光出力が得られ、重送の判断が容易にできる。よって、シートの重送の検知を精度良く実行することができる。   As described above, according to the present embodiment, the light emitting unit 102 and the light receiving unit 103 are provided at positions facing the clear band 101a, and the width of the slit is substantially the same as the margin between the MICR character and the subsequent MICR character. When slit members 104 and 105 having the same or smaller size are provided between the light emitting unit 102 and the light receiving unit 103 and the state where the light receiving output reaches the double feed detection level continues for a predetermined length or more, It is determined that the check 101 is a double feed. As a result, when the check 101 is transported without double feeding and moved to a position where the slit is opposed to the blank portion between MICR characters (between printing), it is possible to receive only the light transmitted between the printing. A sufficiently large light receiving output can be obtained as compared with the case of receiving light transmitted through the blank portion (between printing) between the MICR characters of the two checks 101, and determination of double feeding can be made easily. Therefore, it is possible to accurately detect the double feeding of sheets.

また、ＭＩＣＲ文字のみが印字される領域であるクリアバンド１０１ａにて重送検知が行われるので、重送検知の精度が保証される。   In addition, since double feed detection is performed in the clear band 101a, which is an area where only MICR characters are printed, the accuracy of double feed detection is guaranteed.

本実施の形態に係る重送検知装置の概略構成を示す図である。It is a figure which shows schematic structure of the double feed detection apparatus which concerns on this Embodiment. 図１の重送検知装置の概略構成の第１変形例を示す図である。It is a figure which shows the 1st modification of schematic structure of the double feed detection apparatus of FIG. 図１の重送検知装置の概略構成の第２変形例を示す図である。It is a figure which shows the 2nd modification of schematic structure of the double feed detection apparatus of FIG. チェックと、発光部及び受光部との位置関係を示す図である。It is a figure which shows the positional relationship of a check and a light emission part and a light-receiving part. （Ａ）はチェックを重送していない場合のクリアバンドの拡大図であり、（Ｂ）はチェックを重送している場合のクリアバンドの拡大図である。(A) is an enlarged view of the clear band when the check is not double-fed, and (B) is an enlarged view of the clear band when the check is double-fed. （Ａ）は、チェックを重送していない場合の受光出力波形を示す図であり、（Ｂ）は、チェックを重送している場合の受光出力波形を示す図である。(A) is a figure which shows the light reception output waveform when not double feeding a check, (B) is a figure which shows the light reception output waveform when double feeding a check. ＣＰＵで実行される重送検知の処理を示すフローチャートである。It is a flowchart which shows the process of the double feed detection performed with CPU. 従来のチェックスキャナに組み込まれている重送検知装置の概略構成を示す図である。It is a figure which shows schematic structure of the double feed detection apparatus integrated in the conventional check scanner. チェックと、発光部及び受光部との位置関係を示す図である。It is a figure which shows the positional relationship of a check and a light emission part and a light-receiving part. クリアバンドの拡大図である。It is an enlarged view of a clear band. 発光部及び受光部が図９の位置６に配置された場合のチェック搬送時の受光出力波形を示す図である。It is a figure which shows the light reception output waveform at the time of check conveyance in case the light emission part and the light-receiving part are arrange | positioned in the position 6 of FIG. チェックと、発光部及び受光部との位置関係を示す図である。It is a figure which shows the positional relationship of a check and a light emission part and a light-receiving part. 発光部及び受光部が図１２の位置５に配置された場合のチェック搬送時の受光出力波形を示す図である。It is a figure which shows the light reception output waveform at the time of check conveyance when a light emission part and a light-receiving part are arrange | positioned in the position 5 of FIG. ２枚のチェックが重送される状態を示す図である。It is a figure which shows the state in which two sheets of checks are double-fed. 図１４のチェック重送時の受光出力波形を示す図である。It is a figure which shows the light reception output waveform at the time of the check double feeding of FIG.

符号の説明Explanation of symbols

１０１ チェック
１０１ａ クリアバンド
１０１ｂ 非クリアバンド
１０２ 発光部
１０３ 受光部
１０４，１０５ スリット部材
１０６ ＣＰＵ
１０７ 駆動部
１０８ 操作部
２０３ ＭＩＣＲ印字 101 Check 101a Clear band 101b Non-clear band 102 Light emitting unit 103 Light receiving unit 104, 105 Slit member 106 CPU
107 Drive unit 108 Operation unit 203 MICR printing

Claims (10)

搬送路に沿って搬送されるシートの所定領域に光を照射する発光手段と、
前記搬送路を挟み前記発光手段と対向する位置に配置され、前記シートの所定領域からの透過光を受光する受光手段と、
前記発光手段と前記受光手段との間に配置され、前記発光手段が照射する光及び前記受光手段が受光する光の光束の少なくともいずれか一方を狭める光束制限手段と、
前記受光手段からの出力に基づいて、前記搬送路に沿って搬送されるシートが重送であるか否かの判断を行う判断手段とを備え、
前記光束制限手段は、前記シートの所定領域に印字される文字間の幅と略同等か当該文字間の幅を越えない範囲に前記光束を狭めており、
前記判断手段は、前記受光手段からの出力が重送検知レベルに達した状態にあり、且つその状態が所定値以上連続した場合に重送と判断することを特徴とする重送検知装置。 A light emitting means for irradiating a predetermined area of the sheet conveyed along the conveyance path;
A light receiving means that is disposed at a position facing the light emitting means across the conveyance path, and that receives transmitted light from a predetermined region of the sheet;
A light flux limiting means that is disposed between the light emitting means and the light receiving means, and narrows at least one of light emitted by the light emitting means and light flux received by the light receiving means;
Determination means for determining whether or not the sheet conveyed along the conveyance path is double-feed based on an output from the light receiving means;
The luminous flux limiting means narrows the luminous flux to a range that is substantially equal to or not exceeding the width between characters printed in a predetermined area of the sheet,
The multi-feed detection apparatus according to claim 1, wherein the determination unit determines that multi-feed is in a state where the output from the light receiving unit has reached a multi-feed detection level and the state continues for a predetermined value or more. 前記シートの所定領域は、磁気印刷用に指定された領域であって且つＭＩＣＲ印字が行われる領域であることを特徴とする請求項１記載の重送検知装置。 2. The multifeed detection apparatus according to claim 1, wherein the predetermined area of the sheet is an area designated for magnetic printing and MICR printing is performed. 前記光束制限手段は、前記シートの所定領域として磁気印刷用に指定された領域に印字される文字間の余白の幅を越えない幅を有するスリットであることを特徴とする請求項１又は２記載の重送検知装置。 3. The light flux limiting means is a slit having a width that does not exceed a margin width between characters printed in an area designated for magnetic printing as a predetermined area of the sheet. Double feed detector. 前記光束制限手段は、前記発光手段が照射する光及び前記受光手段が受光する光の光束の少なくともいずれか一方を狭めるスリットを含むスリット手段と、前記スリットの幅を設定するためのスリット幅設定手段と、前記スリット手段を駆動する駆動手段と、前記スリットの幅が前記スリット幅設定手段で設定された幅になるように前記駆動手段に制御信号を出力する制御手段とを備えることを特徴とする請求項１又は２記載の重送検知装置。   The light flux limiting means includes slit means including a slit for narrowing at least one of light emitted from the light emitting means and light received by the light receiving means, and slit width setting means for setting the width of the slit. And a drive means for driving the slit means, and a control means for outputting a control signal to the drive means so that the width of the slit becomes a width set by the slit width setting means. The double feed detection device according to claim 1 or 2. 前記重送検知レベルは、シート１枚が搬送されたときの受光手段からの出力値と重送されたときの受光手段からの出力値との間に設定されていることを特徴とする請求項１乃至４のいずれか１項記載の重送検知装置。   The double feed detection level is set between an output value from the light receiving unit when one sheet is conveyed and an output value from the light receiving unit when the single sheet is conveyed. The double feed detection device according to any one of 1 to 4. 前記所定値は、所定時間、前記シートの所定の搬送距離、及び前記シートを搬送する搬送手段の所定のステップ数又は所定のステップパルス数のいずれか１つであることを特徴とする請求項１乃至５のいずれか１項記載の重送検知装置。   2. The predetermined value is any one of a predetermined time, a predetermined conveyance distance of the sheet, and a predetermined number of steps or a predetermined number of step pulses of a conveying unit that conveys the sheet. The multifeed detection device according to any one of items 1 to 5. 搬送路に沿って搬送されるシートの重送を検知するための重送検知装置で用いられる重送検知方法であって、A double feed detection method used in a double feed detection device for detecting double feed of a sheet conveyed along a conveyance path,
発光部が前記搬送路に沿って搬送されるシートの所定領域に光を照射する第１のステップと、A first step of irradiating light onto a predetermined area of a sheet conveyed by the light emitting unit along the conveyance path;
前記発光部と前記搬送路を挟んで前記発光部に対向する位置に配置された受光部との間に配置された光束制限部が前記シートの所定領域に印字される文字間の幅と略同等か当該文字間の幅を越えない範囲に光束を狭める第２のステップと、A light flux restricting portion disposed between the light emitting portion and the light receiving portion disposed at a position facing the light emitting portion across the conveyance path is substantially equal to a width between characters printed in a predetermined area of the sheet. Or a second step of narrowing the luminous flux within a range not exceeding the width between the characters,
前記受光部が前記シートの所定領域からの透過光を受光する第３のステップと、A third step in which the light receiving unit receives transmitted light from a predetermined region of the sheet;
判断部が前記受光部からの出力が重送検知レベルに達した状態にあり、且つその状態が所定値以上連続した場合に重送と判断する第４のステップとを有することを特徴とする重送検知方法。And a fourth step in which the determining unit determines that the multi-feed is detected when the output from the light receiving unit has reached the double-feed detection level and the state continues for a predetermined value or more. Feed detection method. 前記シートの所定領域は、磁気印刷用に指定された領域であって且つＭＩＣＲ印字が行われる領域であることを特徴とする請求項７記載の重送検知方法。8. The multifeed detection method according to claim 7, wherein the predetermined area of the sheet is an area designated for magnetic printing and MICR printing is performed. 前記光束制限部は前記シートの所定領域である磁気印刷用に指定された領域に所定間隔で印字される文字間の余白の幅を越えない幅を有するスリットであることを特徴とする請求項７又は８記載の重送検知方法。8. The light beam restricting portion is a slit having a width not exceeding a width of a margin between characters printed at a predetermined interval in an area designated for magnetic printing which is a predetermined area of the sheet. Or the double feed detection method of 8. 前記所定値として、所定時間、前記シートの所定の搬送距離、及び前記シートを搬送する搬送手段の所定のステップ数又は所定のステップパルス数のいずれか１つを用いることを特徴とする請求項６乃至９のいずれか１項記載の重送検知方法。7. The predetermined value is any one of a predetermined time, a predetermined conveyance distance of the sheet, and a predetermined number of steps or a predetermined number of step pulses of a conveying unit that conveys the sheet. The double feed detection method according to any one of claims 1 to 9.
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JPS6137644A (en) * 1984-07-26 1986-02-22 Fuji Xerox Co Ltd Double feed detector
JPS62171852A (en) * 1985-12-06 1987-07-28 Shimadzu Corp Supply parts malfunction detector
JP2970031B2 (en) * 1991-04-19 1999-11-02 富士通株式会社 Medium identification device

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JP2003040488A (en) * 2001-07-27 2003-02-13 Canon Inc Carried sheet detecting device, and image forming device provided with the same
JP2003212391A (en) * 2002-01-23 2003-07-30 Canon Inc Identification device of recorded medium, identification method and recording device

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