JPS60233504A - Paper size detecting device - Google Patents

Paper size detecting device

Info

Publication number
JPS60233504A
JPS60233504A JP8903484A JP8903484A JPS60233504A JP S60233504 A JPS60233504 A JP S60233504A JP 8903484 A JP8903484 A JP 8903484A JP 8903484 A JP8903484 A JP 8903484A JP S60233504 A JPS60233504 A JP S60233504A
Authority
JP
Japan
Prior art keywords
paper
light
light emitting
width
receiving element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8903484A
Other languages
Japanese (ja)
Inventor
Akira Ikoma
生駒 公
Goro Mori
森 五郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP8903484A priority Critical patent/JPS60233504A/en
Publication of JPS60233504A publication Critical patent/JPS60233504A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical techniques
    • G01B11/02Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/04Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving
    • G01B11/046Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness specially adapted for measuring length or width of objects while moving for measuring width

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

PURPOSE:To detect a width without causing a wrong detection even against paper of an indefinite size by detecting the width of paper by plural light emitting element groups which are placed at a constant interval in a prescribed direction and whose light emitting current is controlled through a memory, and a photodetector. CONSTITUTION:An LED array 15 is formed by LEDs arranged at a prescribed interval in the width direction of paper 12, and a current supplied to each LED of the array 15 is stored in a memory so that an output of a photodetector 16 opposed to the array 15 becomes constant, in case when there is no paper 12. The current is supplied successively to the LED through this memory, a width of the paper 12 is detected based on a comparison of the output of the element 16 and the reference value, and even against paper of an indefinite size, its width can be detected without causing a wrong detection.

Description

【発明の詳細な説明】 (技術分野) 本発明は複写機等に用いられ、原稿や記録紙等(従来技
術) 従来、紙サイズ検出装置としては第1図〜第3図に示す
ように各規格サイズ、例えばB5. A4. B4゜A
3の紙11a、〜114の片側が基準線5に揃えられて
搬送されることを利用したものであって、各規格サイズ
とその1段下の規格サイズとの間の位置及び最小規格サ
イズ内の位置に対応して複数の反射型フォトセンサ6〜
9を紙幅方向に配置し、搬送ローラ10により搬送され
る紙11を7オトセンサ6〜9で検出してその出力信号
から紙11のサイズがどの規格サイズであるかを検出す
るものがある。
DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention is used for copying machines and the like, and detects originals, recording paper, etc. (prior art) Conventionally, as a paper size detection device, there are various Standard size, for example B5. A4. B4゜A
This method takes advantage of the fact that one side of the papers 11a to 114 in No. 3 is conveyed aligned with the reference line 5, and the position between each standard size and the standard size one step below it and within the minimum standard size. A plurality of reflective photosensors 6 to 6 correspond to the positions of
9 are arranged in the paper width direction, the paper 11 conveyed by the conveyance roller 10 is detected by seven sensors 6 to 9, and the standard size of the paper 11 is detected from the output signal thereof.

しかしこの紙サイズ検出装置では規格サイズしか検出で
きず、不定形サイズを検出することができない。そこで
多数の発光ダイオードを紙幅方向に配列すると共に1個
の受光素子をその発光ダイオードアレイと紙の通路を介
して対向させて配置し、多数の発光ダイオードを順次に
発光させて受光素子の出力から紙の幅を検出し、さらに
紙の長さを検出する装置が考えられている。この装置に
よれば規格サイズだけでなく不定形サイズの紙でもその
幅を検出できる。しかし紙は発光ダイオードから受光素
子への光を完全に遮断するものではなく、薄紙には光透
過率が60係を越えるものがある。しかも発光ダイオー
ドの電流を一定にしても発光ダイオード自身の電流・光
変換効率にバラツキがあシ、受光素子の感度にもバラツ
キがおる。このため薄紙に対する誤検出が発生しやすく
なる。
However, this paper size detection device can only detect standard sizes and cannot detect irregular sizes. Therefore, a large number of light emitting diodes are arranged in the width direction of the paper, and one light receiving element is placed facing the light emitting diode array through a paper path, and the light receiving element is made to sequentially emit light, and the output from the light receiving element is Devices that detect the width of paper and also the length of paper have been considered. This device can detect the width of paper of not only standard size but also irregular size. However, paper does not completely block light from the light emitting diode to the light receiving element, and some thin paper has a light transmittance of over 60. Moreover, even if the current of the light emitting diode is constant, there are variations in the current and light conversion efficiency of the light emitting diode itself, and there are also variations in the sensitivity of the light receiving element. Therefore, erroneous detection of thin paper is likely to occur.

(目 的) 本発明は不定形サイズの紙でもその幅を検出できると共
に誤検出がない紙サイズ検出装置を提供することを目的
とする。
(Objective) It is an object of the present invention to provide a paper size detection device that can detect the width of even irregularly sized paper and does not cause false detection.

(構 成) 以下図面を参照しながら本発明を実施例に基づき説明す
る。
(Structure) The present invention will be described below based on examples with reference to the drawings.

第4図及び第5図は本発明の一実施例における紙幅検出
装置の透過型フォトセンサを示す。この実施例は複写機
において原稿搬送装置によυ搬送された原稿のサイズを
検出してこれに合う転写紙を選択して複写する場合等に
使用される。紙12はどのサイズのものでも片側が基準
線13に合わせて搬送ロー214によシ搬送され、その
搬送路における所定の紙幅検出位置の両側に発光ダイオ
ードアレイ15と受光素子16が対向させて配置される
FIGS. 4 and 5 show a transmission type photosensor of a paper width detection device in an embodiment of the present invention. This embodiment is used in a case where a copying machine detects the size of a document transported by a document transport device, selects transfer paper that matches the size, and copies the document. Paper 12 of any size is transported by a transport row 214 with one side aligned with the reference line 13, and a light emitting diode array 15 and a light receiving element 16 are placed facing each other on both sides of a predetermined paper width detection position on the transport path. be done.

発光ダイオードアレイ15は紙12の搬送方向と直角な
方向に多数の発光ダイオード1511〜15m7を一定
の間隔で配列したものでアシ、受光素子16は全ての発
光素子1511〜15□nからの光を紙幅検出位置を介
して受光する受光面を有する。紙幅検出位置はどのサイ
ズの紙でも通る位置、つまシ基準線13から最小紙幅壕
での位置17には必ずしも設定する必要がなく、シたが
って発光ダイオードアレイ15及び受光素子16は基準
線13に近い位置17では省略されている。発光ダイオ
ードアレイ15は第6図〜第8図に示すようにプラスチ
ンクモールドタイプであって光を一方向に集光又は平行
光とするレンズ18と、不必要な部分への光の拡散を防
止する遮光材19とを設けた発光ダイオードを一列に並
べたものであって紙幅検出位置の異なる各領域に光を照
射するものであるが、丸形の発光ダイオードを千鳥形に
並べたものでもよい。受光素子16は第9図に示すよう
な平板状の太陽電池よシなシ、発光ダイオードアレイ1
5全体をカバーするように構成される。
The light emitting diode array 15 has a large number of light emitting diodes 1511 to 15m7 arranged at regular intervals in a direction perpendicular to the conveying direction of the paper 12, and the light receiving element 16 receives light from all the light emitting elements 1511 to 15m7. It has a light receiving surface that receives light through the paper width detection position. The paper width detection position does not necessarily have to be set at the position 17 where any size of paper passes, from the pick reference line 13 to the minimum paper width groove. It is omitted at the nearby position 17. As shown in FIGS. 6 to 8, the light emitting diode array 15 is of a plastic mold type, and includes a lens 18 that condenses light in one direction or converts it into parallel light, and prevents light from spreading to unnecessary areas. Light-emitting diodes provided with a light-shielding material 19 are arranged in a line to irradiate light to different areas at different paper width detection positions, but round-shaped light-emitting diodes may also be arranged in a staggered manner. . The light receiving element 16 is a flat solar cell as shown in FIG. 9, or a light emitting diode array 1.
It is designed to cover the entire 5.

第10図はこの紙幅検出装置の電子回路を示し、第11
図及び第12図はその初期モードと検出モードのタイミ
ングチャートである。図示しないマイクロコンピュータ
(以下CPUという)は紙12の搬送タイミングに合わ
せて初期モードと検出モードを切換え、つまり紙12が
紙幅検出位置を通らなくて紙幅を検出しない時に初期モ
ードの設定を行なって紙12が紙幅検出位置を通過する
紙幅を検出する時に検出モードの設定を行う。第13図
と第14図はとのCPUの初期モードと検出モードでの
処理内容を示す。
FIG. 10 shows the electronic circuit of this paper width detection device, and the 11th
The figure and FIG. 12 are timing charts of the initial mode and detection mode. A microcomputer (hereinafter referred to as CPU), not shown, switches between an initial mode and a detection mode in accordance with the conveyance timing of the paper 12. In other words, when the paper 12 does not pass the paper width detection position and the paper width is not detected, the initial mode is set. 12 sets the detection mode when detecting the paper width passing through the paper width detection position. FIGS. 13 and 14 show the processing contents of the CPU in the initial mode and detection mode.

まずCPUは紙12が紙幅検出位置にない時に初期モー
ドの設定を行ない、リセット信号RESET’1を出力
してアドレスカウンタ20をクリアしその出力を0にす
る。さらにCPUは初期信号INITLALを低レベル
にして判別回路21の判別レベルを所定の基準値REF
’ 1に設定すると共にゲート36をオンさせ、リセッ
ト信号RESET2 を出力してデータカウンタ22を
クリアしその出力を0にする。このときCPUはランダ
ムアクセスメモリ23にその出力側を高インピーダンス
状態にさせて出力信号を出させないようにする。しだが
りてデータカウンタ22の内容がデジタル/アナログ変
換器24でアナログ量に変換されて電流制御回路25が
発光ダイオードアレイ15の駆動されている発光ダイオ
ードの電流をそのアナログ量に応じた値に制御するが、
データカウンタ22の内容がOであるから発光ダイオー
ドは電流がOで発光しない。受光素子16の出力信号は
増幅器26で増幅されて判別回路21で判別レベルと比
較され、その出力信号がアンドゲート27に加えられる
。発振器28からのクロックパルスはカウンタ29で1
/4に分周されてアンドゲート27を通してデータカウ
ンタ22に加えられ、データカウンタ22が発振器28
の発振周波数のl/4の周波数でカウントアツプして発
光ダイオードの電流が増加する。発光ダイオード151
1〜15rrLnはマトリクス回路に組まれてその各行
及び各列が駆動回路30.31によシ駆動され、アドレ
スカウンタ20の出力信号がデコーダ32.33でデコ
ードされる。デコーダ32の出力信号が駆動回路3oに
加えられてマトリクス回路の各行が選択的に駆動され、
デコーダ33の出力信号が駆動回路31に加えられてマ
トリクス回路の各列が選択的に駆動される。
First, the CPU sets the initial mode when the paper 12 is not at the paper width detection position, outputs a reset signal RESET'1, clears the address counter 20, and sets its output to 0. Furthermore, the CPU sets the initial signal INITLAL to a low level to set the discrimination level of the discrimination circuit 21 to a predetermined reference value REF.
' Set to 1, turn on the gate 36, output the reset signal RESET2, clear the data counter 22, and set its output to 0. At this time, the CPU causes the random access memory 23 to have its output side in a high impedance state so as not to output an output signal. Therefore, the contents of the data counter 22 are converted into an analog quantity by the digital/analog converter 24, and the current control circuit 25 changes the current of the light emitting diodes being driven in the light emitting diode array 15 to a value corresponding to the analog quantity. control, but
Since the content of the data counter 22 is O, the light emitting diode does not emit light because the current is O. The output signal of the light receiving element 16 is amplified by an amplifier 26 and compared with a discrimination level by a discrimination circuit 21, and the output signal is applied to an AND gate 27. The clock pulse from the oscillator 28 is counted as 1 by the counter 29.
The frequency is divided by /4 and applied to the data counter 22 through the AND gate 27, and the data counter 22 is applied to the oscillator 28.
The current of the light emitting diode increases by counting up at a frequency of 1/4 of the oscillation frequency. light emitting diode 151
1 to 15rrLn are assembled into a matrix circuit, each row and each column of which is driven by a drive circuit 30.31, and the output signal of the address counter 20 is decoded by a decoder 32.33. The output signal of the decoder 32 is applied to the drive circuit 3o to selectively drive each row of the matrix circuit,
The output signal of the decoder 33 is applied to the drive circuit 31 to selectively drive each column of the matrix circuit.

発光ダイオード1511〜15mnはアドレスカウンタ
20の各カウント値と対応しておシ、アドレスカウンタ
20の現在値に対応するものが選択的に駆動されること
になってその駆動電流が電流制御回路25によ多制御さ
れる。また発振器28からのクロックパルスによシデコ
ーダ33が出力信号をオンオフして発光ダイオードが発
振器28の発振周波数で点滅する。したがって発光ダイ
オード1511〜15mnのうちアドレスカウンタ20
の現在値に対応するものは4回の点滅毎に電流が増加し
て発光量が増加し、増幅器26の出力信号SINが判別
レベルREF1に連続的に3回以上達して判別回路21
の出力が低レベルになると、アンドゲート27が閉じて
データカウンタ22のカウントアツプが停止する。これ
はデータカウンタ22の値が、受光素子16の出力信号
が基準値に達した時の発光ダイオードの電流に相当する
値になったことを意味する。CPUは判別回路21から
インバータ37を介して出力された信号LOCKをチェ
ックしていてこれが高レベルになったことを判別すると
、メモリ23におけるアドレスカウンタ20で指定され
た番地にデータカウンタ22の値を書込ませ、アドレス
カウンタ2oにオア回路34を介してクロックパルスC
LOCK を加えてアドレスカウンタ20をインクリメ
ントすることにより次の発光ダイオードについての動作
に移行させる。
The light emitting diodes 1511 to 15mn correspond to each count value of the address counter 20, and those corresponding to the current value of the address counter 20 are selectively driven, and the drive current is sent to the current control circuit 25. Very controlled. Further, the decoder 33 turns on and off the output signal according to the clock pulse from the oscillator 28, and the light emitting diode blinks at the oscillation frequency of the oscillator 28. Therefore, among the light emitting diodes 1511 to 15mn, the address counter 20
The current value corresponds to the current value, and the current increases every four blinks and the amount of light emitted increases, and the output signal SIN of the amplifier 26 reaches the discrimination level REF1 three or more times in succession, and the discrimination circuit 21
When the output becomes low level, the AND gate 27 closes and the data counter 22 stops counting up. This means that the value of the data counter 22 has reached a value corresponding to the current of the light emitting diode when the output signal of the light receiving element 16 reaches the reference value. The CPU checks the signal LOCK output from the discrimination circuit 21 via the inverter 37, and when it determines that this signal has become high level, it transfers the value of the data counter 22 to the address specified by the address counter 20 in the memory 23. The clock pulse C is written to the address counter 2o via the OR circuit 34.
By adding LOCK and incrementing the address counter 20, the operation shifts to the next light emitting diode.

そしてCPUは再びリセット信号RESET2を出力し
てデータカウンタ22をクリアし、以後は上記動作がく
シ返されて全ての発光ダイオード1511〜15mgに
ついて各々電流を徐々に増加して行って受光素子16の
出力信号が基準値に達した時のデータカウンタ22の値
がメモリ23のアドレスカウンタ20で順次に指定され
る各番地に書込まれる。CPUは紙12が紙幅検出位置
にない時には常に初期モードに設定して上記作業をくシ
返せばよい。
Then, the CPU outputs the reset signal RESET2 again to clear the data counter 22, and from then on, the above operation is repeated, and the current is gradually increased for all the light emitting diodes 1511 to 15mg, and the output of the light receiving element 16 is performed. The value of the data counter 22 when the signal reaches the reference value is written to each address sequentially designated by the address counter 20 of the memory 23. When the paper 12 is not at the paper width detection position, the CPU should always set the mode to the initial mode and repeat the above operations.

・またCPUは紙12が紙幅検出位置に有る時に検出モ
ードに設定し、初期信号INITIALを高レベルにし
て判別回路21の判別レベルを上記基準値REF 1よ
シ小さい紙有無判定の基準レベルREF2に切換えさせ
ると共にアンドゲート35をオンさせてアンドゲート3
6をオフさせる。この場合基準値REFI、 REF2
の切換を行う代シに電流制御回路25で初期信号INI
TIALにより発光ダイオードの電流を一定の割合で増
加させるようにしてもよい。さらにCPUはメモリ23
を読出し状態にし、リセット信号RESETIでアドレ
スカウンタ20をクリアする。メモリ23はアドレスカ
ウンタ20によシ指定された番地の内容が読出されてデ
ジタル/アナログ変換器24によシアナログ量に変換さ
れ、電流制御回路25は発光ダイオードアレイ15の駆
動されている発光ダイオードの電流をそのアナログ量に
応じた値に制御する。発光ダイオードアレイ15は前述
の如くアドレスカウンタ20の値に対応する発光ダイオ
ードが発振器28の発振周波数で点滅し、受光素子16
の出力信号が増幅器26で増幅されて判別回路21で判
別レベルREF2と比較されることによって発光ダイオ
ードから受光素子16への光が紙12で遮断されたか否
かが判別される。この判別回路21の出力信号がアンド
ゲート27に加えられ、発光ダイオードから受光素子へ
の光が紙12で遮断された時にアンドゲート27が開く
。発振器28からのクロックパルスはカウンタ29で漬
に分周されてアンドゲート27.35及びオア回路34
を通ってアドレスカウンタ20に加えられ、アドレスカ
ウンタ20が発光ダイオードの4回点滅毎にカウントア
ツプする。発光ダイオード1511〜15mnはアドレ
スカウンタ20の内容に対応して基準線13に最も近い
もの1511より基準線13から遠くなる順に4回ずつ
点滅し、その光が紙12で遮断されている間は判別回路
21の出力信号が高レベルのままである。発光ダイオー
ドからの光が紙12の無い所を通って受光素子16に入
るようになると、判別回路21はその発光ダイオードの
点滅で増幅器26の出力信号S工Nが3回以上連続的に
判別レベルREF’2以上になることによシ出力信号が
低レベルになり、アンドゲート27がオフしてアドレス
カウンタ20のカウントアンプが停止する。この時アド
レスカウンタ20の値、は紙12で光が遮断されない発
光ダイオードのうち基準線13に最も近いものに対応し
、紙12の幅を示すデータとなる。CPUは判別回路2
1からインバータ37を介して入力される信号LOCK
をチーツクしてこれが高レベルになったことを判別する
と、ロード信号LOADでシフトレジスタ38にアドレ
スカウンタ20のデータをロードさせ、このデータをク
ロック信号CLOCKによりシフトレジスタ38に直列
に出力させて読込む。
・Also, the CPU sets the detection mode when the paper 12 is at the paper width detection position, sets the initial signal INITIAL to high level, and sets the discrimination level of the discrimination circuit 21 to the reference level REF2 for determining the presence of paper, which is smaller than the reference value REF1. At the same time, AND gate 35 is turned on and AND gate 3 is switched on.
Turn off 6. In this case, the reference values REFI, REF2
In order to perform the switching, the current control circuit 25 outputs the initial signal INI.
TIAL may be used to increase the current of the light emitting diode at a constant rate. Furthermore, the CPU has memory 23
is placed in a read state, and the address counter 20 is cleared by the reset signal RESETI. In the memory 23, the contents of the address specified by the address counter 20 are read and converted into an analog quantity by the digital/analog converter 24, and the current control circuit 25 controls the light emitting diodes of the light emitting diode array 15 being driven. The current is controlled to a value corresponding to the analog amount. As described above, in the light emitting diode array 15, the light emitting diodes corresponding to the value of the address counter 20 blink at the oscillation frequency of the oscillator 28, and the light receiving element 16
The output signal is amplified by the amplifier 26 and compared with the discrimination level REF2 by the discrimination circuit 21, thereby determining whether or not the light from the light emitting diode to the light receiving element 16 is blocked by the paper 12. The output signal of this discrimination circuit 21 is applied to the AND gate 27, and when the light from the light emitting diode to the light receiving element is blocked by the paper 12, the AND gate 27 opens. The clock pulse from the oscillator 28 is frequency-divided by the counter 29 and passed through the AND gate 27.35 and the OR circuit 34.
The address counter 20 counts up every four blinks of the light emitting diode. The light emitting diodes 1511 to 15mn blink four times in the order of distance from the reference line 13 from the one 1511 closest to the reference line 13 in accordance with the contents of the address counter 20, and while the light is blocked by the paper 12, discrimination is made. The output signal of circuit 21 remains at a high level. When the light from the light-emitting diode passes through the area where there is no paper 12 and enters the light-receiving element 16, the discrimination circuit 21 causes the output signal S of the amplifier 26 to change to the discrimination level three or more times in a row due to the blinking of the light-emitting diode. When REF'2 or more is reached, the output signal becomes low level, the AND gate 27 is turned off, and the count amplifier of the address counter 20 is stopped. At this time, the value of the address counter 20 corresponds to the one closest to the reference line 13 among the light emitting diodes whose light is not blocked by the paper 12, and becomes data indicating the width of the paper 12. CPU is discrimination circuit 2
Signal LOCK input from 1 through inverter 37
When it is determined that this has become a high level, the shift register 38 is loaded with the data of the address counter 20 using the load signal LOAD, and this data is serially output to the shift register 38 using the clock signal CLOCK and read. .

この実施例は紙12の端面が基準線13に合わせて搬送
される場合についての一例であるが、紙12の中央が搬
送路の中央に合わせて搬送される場合には発光ダイオー
ドアレイ15及び受光素子16を搬送路の中央よシ片側
だけに設は発光ダイオードを搬送路の中央に最も近いも
のから遠くなる順に発光させるようにしてもよい。また
発光ダイオードの配列方向は紙12の搬送方向と交差す
る方向であればよい。
This embodiment is an example in which the end surface of the paper 12 is conveyed in alignment with the reference line 13, but when the paper 12 is conveyed in alignment with the center of the conveyance path, the light emitting diode array 15 and the light receiving If the element 16 is provided only on one side of the transport path, the light emitting diodes may be emitted from the light emitting diodes in the order of distance from the center of the transport path. Furthermore, the direction in which the light emitting diodes are arranged may be any direction that intersects the direction in which the paper 12 is conveyed.

受光素子16及び増幅器26は/−ルド部材39でシー
ルドされ、外来ノイズ等による影響を受けないようにな
っている。
The light receiving element 16 and the amplifier 26 are shielded by a shield member 39 so as not to be affected by external noise.

第15図は上記受光素子16.増幅器26及び判別回路
21を具体的に示し、図中蔚は演算増幅器、CMPはコ
ンパレータ、TRはトランジスタ、SWはアナログスイ
ッチ、SRはシフトレジスタ、ANDはアンドゲート、
NANDはナンド回路、NORはノア回路、Nはインバ
ータ、Dはダイオード、Cはコンデンサ、R1−R9は
抵抗である。初期モードでは初期信号INITIALが
低レベルでアナログスイッチSWがオフとなり、判別レ
ベルREFI が抵抗R5,R6により設定される。受
光素子16の出力信号は演算増幅器AMPによシ増幅さ
れてコン、?レータCMPで上記判別レベルREFIと
比較され、その出力信号によりトランジスタTRがオン
、オフする。
FIG. 15 shows the light receiving element 16. The amplifier 26 and the discrimination circuit 21 are specifically shown, and in the figure, 蔚 is an operational amplifier, CMP is a comparator, TR is a transistor, SW is an analog switch, SR is a shift register, AND is an AND gate,
NAND is a NAND circuit, NOR is a NOR circuit, N is an inverter, D is a diode, C is a capacitor, and R1-R9 are resistors. In the initial mode, the initial signal INITIAL is at a low level, the analog switch SW is turned off, and the discrimination level REFI is set by the resistors R5 and R6. The output signal of the light-receiving element 16 is amplified by the operational amplifier AMP, and the output signal is amplified by the operational amplifier AMP. The signal is compared with the discrimination level REFI by the regulator CMP, and the transistor TR is turned on and off by the output signal.

シフトレジスタSRはリセット信号RESET2がアン
ドゲートA)■、ノア回路NORを介して加えられるこ
とによシリセットされ、トランジスタTRの出力信号を
発振器28からのクロックパルスによシ読込んで/フト
する。シフトレジスタSRの各桁出力はナンド回路NA
NDに加えられ、トランジスタTRの出力パルスが3つ
以上連続的にシフトレジスタSRに入力された時にナン
ド回路NANDの出力信号LOCK が低レベルになる
。また検出モードでは初期信号INITIALが高レベ
ルになってアナログスイッチ歴がオンし、判別レベルR
EF2が抵抗R4〜R6によシ設定される。シフトレジ
スタSRはりセント信号RESET1がノア回路NOR
を介して加えられることによシリセットされ、トランジ
スタTRの出力パルスが3つ以上連続的にシフトレジス
タSRに入力された時にナンド回路NANDの出力信号
LOCKが低レベルになる。
The shift register SR is reset by applying a reset signal RESET2 through an AND gate A) and a NOR circuit NOR, and the output signal of the transistor TR is read/shifted by a clock pulse from an oscillator 28. Each digit output of shift register SR is a NAND circuit NA
When three or more output pulses of the transistor TR are input to the shift register SR in succession, the output signal LOCK of the NAND circuit NAND becomes low level. In addition, in the detection mode, the initial signal INITIAL becomes high level, the analog switch history is turned on, and the discrimination level R
EF2 is set by resistors R4 to R6. The shift register SR's cent signal RESET1 is the NOR circuit NOR
When three or more output pulses from the transistor TR are input to the shift register SR in succession, the output signal LOCK of the NAND circuit NAND becomes low level.

第16図はこの実施例における紙長検出装置を示す。FIG. 16 shows a paper length detection device in this embodiment.

従動ローラ40は紙の搬送路における所定の位置に設け
られ、紙12の搬送に従動して回転する。エンコーダ4
1のスリント円板42は従動ローラ40と一体であり、
フォトセンサ43は定位置でスリット円板42上の一定
間隔で同一円周上に配列されているスリットを検出する
。このフォトセンサ43の出カバルス数は紙12の長さ
を示すことになる。
The driven roller 40 is provided at a predetermined position on the paper conveyance path, and rotates as the paper 12 is conveyed. encoder 4
The slint disk 42 of No. 1 is integrated with the driven roller 40,
The photosensor 43 detects slits arranged on the same circumference at regular intervals on the slit disk 42 at a fixed position. The number of output signals from the photosensor 43 indicates the length of the paper 12.

この紙長検出装置は上記紙幅検出装置と同様なものを使
用してもよい。この場合第17図に示すように発光ダイ
オードアレイ44及び受光素子45は紙12が搬送ロー
ラ46によシ搬送される方向と発光ダイオード配列方向
が平行になるように配置され、紙12の先端が発光ダイ
オードアレイ44の先端に達しだ直後に検出モードの設
定が行なわれ、かつ発光ダイオードは先端のものから順
に点滅される。
This paper length detection device may be similar to the paper width detection device described above. In this case, as shown in FIG. 17, the light emitting diode array 44 and the light receiving element 45 are arranged so that the direction in which the paper 12 is conveyed by the conveyance roller 46 and the direction in which the light emitting diodes are arranged are parallel, and the leading edge of the paper 12 is Immediately after reaching the tip of the light emitting diode array 44, the detection mode is set, and the light emitting diodes are blinked in order from the tip.

発光ダイオードアレイ15.44における各発光ダイオ
ードの間隔は小さければ小さいほど精度が良くなるが、
実用上は0.2mm〜5mm程度にすれば問題ない。ま
た発光ダイオードアレイ15,44の代セに豆球等の発
光素子を一定の間隔で多数配列したものでもよく、受光
素子16.45はフォトトランジスタ等を用いてもよい
。また紙がセットされる位置でその大きさを検出するよ
うにしてもよく、紙長検出装置は必要がなければ省略し
てもよい。更に発光ダイオードアレイ及び受光素子より
なるフォトセンサは上記実施例では透過型であるが、反
射型としてもよく、受光素子は複数個を組合せたもので
もよい。
The smaller the interval between each light emitting diode in the light emitting diode array 15.44, the better the accuracy.
For practical purposes, there is no problem if the thickness is set to about 0.2 mm to 5 mm. Further, instead of the light emitting diode arrays 15 and 44, a large number of light emitting elements such as miniature bulbs may be arranged at regular intervals, and phototransistors or the like may be used as the light receiving elements 16 and 45. Further, the size of the paper may be detected at the position where the paper is set, and the paper length detection device may be omitted if unnecessary. Furthermore, although the photosensor consisting of a light emitting diode array and a light receiving element is of a transmissive type in the above embodiment, it may be of a reflective type, and a plurality of light receiving elements may be combined.

(効 果) 以上のように本発明によれば複数の発光素子を断交の方
向に一定の間隔で配置したものと受光素子とを用いて紙
幅を検出するので、規格サイズだけでなく不定形サイズ
の紙幅も検出できる。さらに紙が検出位置にない状態で
各発光素子を順次に発光させて受光素子の出力が略同じ
になる各発光素子の電流を検出してメモリに記、憶させ
、紙が検出位置に有る状態で各発光素子を順次に上記メ
モリで記憶している電流で発光させて紙幅を検出するの
で、紙が薄くても又発光素子の電流・光変換効率のバラ
ツキや受光素子のバラツキがあっても紙幅を正確に検出
できて誤検出がなくなる。
(Effects) As described above, according to the present invention, the paper width is detected using a plurality of light emitting elements arranged at regular intervals in the cross-cutting direction and a light receiving element. The width of the paper can also be detected. Furthermore, when the paper is not at the detection position, each light emitting element is made to emit light in sequence, and the current of each light emitting element is detected and stored in the memory so that the output of the light receiving element is approximately the same, and the paper is at the detection position. The paper width is detected by sequentially causing each light-emitting element to emit light using the current stored in the memory, so even if the paper is thin, there are variations in the current/light conversion efficiency of the light-emitting elements, and variations in the light-receiving element. The paper width can be detected accurately, eliminating false detections.

【図面の簡単な説明】[Brief explanation of drawings]

第1図〜第3図は従来の紙サイズ検出装置を示す平面図
、正面図及び斜視図、第4図及び第5図は本発明の一実
施例における紙幅検出装置の7オトセンサを示す斜視図
及び正面図、第6図は同フォトセンサの発光ダイオード
プレイを示す一部切欠斜視図、第7図及び第8図は同発
光ダイオードアレイにおける1つの発光ダイオードを示
す斜視図及び正面図、第9図は上記フォトセンサの受光
素子を示す一部切欠斜視図、第10図は上記紙幅検出装
置の電子回路を示すブロック図、第11図及び第12図
は同電子回路の初期モードと検出モードのタイミングチ
ャート、第13図及び第14図は上記紙幅検出装置にお
けるCPUの制御内容を示すフローチャート、第15図
は上記電子回路の一部を具体的に示す回路図、第16図
は上記実施例の紙長検出装置を示す斜視図、第17図は
紙長検出装置の他の例の一部を示す斜視図である。 15・・・発光ダイオードプレイ、16・・受光素子、
20・・・アドレスカウンタ、21・・判別回路、22
・・データカウンタ、23・・・メモリ、25・・・電
流制御回路。 プ唸 代理人 樺 山 %12図 SIN
1 to 3 are a plan view, a front view, and a perspective view showing a conventional paper size detection device, and FIGS. 4 and 5 are perspective views showing seven sensors of a paper width detection device in an embodiment of the present invention. and a front view, FIG. 6 is a partially cutaway perspective view showing a light emitting diode play of the photo sensor, FIGS. 7 and 8 are a perspective view and a front view showing one light emitting diode in the light emitting diode array, and FIG. 10 is a block diagram showing the electronic circuit of the paper width detection device, and FIGS. 11 and 12 show the initial mode and detection mode of the electronic circuit. A timing chart, FIGS. 13 and 14 are flowcharts showing the control contents of the CPU in the paper width detection device, FIG. 15 is a circuit diagram specifically showing a part of the electronic circuit, and FIG. A perspective view showing a paper length detection device. FIG. 17 is a perspective view showing a part of another example of a paper length detection device. 15... Light emitting diode play, 16... Light receiving element,
20...Address counter, 21...Discrimination circuit, 22
...Data counter, 23...Memory, 25...Current control circuit. Puuu agent Kabayama %12 figure SIN

Claims (1)

【特許請求の範囲】[Claims] 所定の方向に一定の間隔をおいて配置され所定の検出位
置に順次に光を照射する複数の発光素子と、この複数の
発光素子から上記検出位置を通過して又は紙で反射され
て到来した光を検出する受光素子と、上記検出位置に紙
が無い状態で前記複数の発光素子を1−次に発光させ前
記受光素子の出力が略同じになる前記複数の発光素子の
各電流を検出してメモリに記憶させる手段と、上記検出
位置に紙が有る状態にて前記複数の発光素子を順次に前
記メモリで記憶している各電流で発光させ前記受光素子
の出力を基準値と比較して紙の幅を検出する手段とを備
えた紙サイズ検出装置。
A plurality of light emitting elements are arranged at regular intervals in a predetermined direction and sequentially emit light to a predetermined detection position, and light emitted from the plurality of light emitting elements passes through the detection position or is reflected by paper. A light-receiving element that detects light and a plurality of light-emitting elements are caused to emit light in the first order with no paper at the detection position, and each current of the plurality of light-emitting elements is detected so that the output of the light-receiving element is approximately the same. a means for storing the light in the memory, and a means for sequentially causing the plurality of light emitting elements to emit light with each current stored in the memory while paper is at the detection position, and comparing the output of the light receiving element with a reference value. A paper size detection device comprising means for detecting the width of paper.
JP8903484A 1984-05-02 1984-05-02 Paper size detecting device Pending JPS60233504A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8903484A JPS60233504A (en) 1984-05-02 1984-05-02 Paper size detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8903484A JPS60233504A (en) 1984-05-02 1984-05-02 Paper size detecting device

Publications (1)

Publication Number Publication Date
JPS60233504A true JPS60233504A (en) 1985-11-20

Family

ID=13959607

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8903484A Pending JPS60233504A (en) 1984-05-02 1984-05-02 Paper size detecting device

Country Status (1)

Country Link
JP (1) JPS60233504A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0299801A (en) * 1988-07-26 1990-04-11 Heidelberger Druckmas Ag Device for detecting position of edge section
EP0517928A1 (en) * 1990-12-28 1992-12-16 ISHIDA CO., Ltd. Apparatus for detecting position of article to be fed
JPH06156649A (en) * 1992-11-27 1994-06-03 Sharp Corp Base board conveyor device
JP2006052032A (en) * 2004-08-10 2006-02-23 Fuji Xerox Co Ltd Sheet length detector for image forming device, and image forming device
CN103712570A (en) * 2012-10-09 2014-04-09 富士施乐株式会社 Detection apparatus
US10195880B2 (en) 2017-03-02 2019-02-05 Datamax-O'neil Corporation Automatic width detection

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0299801A (en) * 1988-07-26 1990-04-11 Heidelberger Druckmas Ag Device for detecting position of edge section
EP0517928A1 (en) * 1990-12-28 1992-12-16 ISHIDA CO., Ltd. Apparatus for detecting position of article to be fed
EP0517928A4 (en) * 1990-12-28 1994-06-22 Ishida Scale Mfg Co Ltd Apparatus for detecting position of article to be fed
JPH06156649A (en) * 1992-11-27 1994-06-03 Sharp Corp Base board conveyor device
JP2006052032A (en) * 2004-08-10 2006-02-23 Fuji Xerox Co Ltd Sheet length detector for image forming device, and image forming device
JP4556543B2 (en) * 2004-08-10 2010-10-06 富士ゼロックス株式会社 Image forming apparatus
CN103712570A (en) * 2012-10-09 2014-04-09 富士施乐株式会社 Detection apparatus
JP2014077660A (en) * 2012-10-09 2014-05-01 Fuji Xerox Co Ltd Detector
US9400342B2 (en) 2012-10-09 2016-07-26 Fuji Xerox Co., Ltd. Detection apparatus
US10195880B2 (en) 2017-03-02 2019-02-05 Datamax-O'neil Corporation Automatic width detection
US10625525B2 (en) 2017-03-02 2020-04-21 Datamax-O'neil Corporation Automatic width detection

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