JPH03146938A - Original size detecting device for image forming device - Google Patents
Original size detecting device for image forming deviceInfo
- Publication number
- JPH03146938A JPH03146938A JP1284942A JP28494289A JPH03146938A JP H03146938 A JPH03146938 A JP H03146938A JP 1284942 A JP1284942 A JP 1284942A JP 28494289 A JP28494289 A JP 28494289A JP H03146938 A JPH03146938 A JP H03146938A
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- JP
- Japan
- Prior art keywords
- document
- original
- size
- detection
- signal
- 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
Links
- 238000001514 detection method Methods 0.000 claims abstract description 92
- 238000009432 framing Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 108091008695 photoreceptors Proteins 0.000 description 1
Landscapes
- Holders For Sensitive Materials And Originals (AREA)
- Exposure Or Original Feeding In Electrophotography (AREA)
- Control Or Security For Electrophotography (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、複写機、プリンタ、フアツジくり等の画像形
成装置の原稿サイズ検知装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a document size detection device for an image forming apparatus such as a copying machine, a printer, and a fudge cutter.
複写機等の画像形成装置においては、原稿台の下方に複
数の発光部と受光部を有する原稿検知手段を設け、スイ
ッチにより原稿台上の原稿を押える原稿押え手段が開い
たときと閉した時とを検知し、原稿押え手段が閉したと
きと開いたときとの夫々の原稿検知手段の検知信号に基
づいて原稿のサイズを検知する装置はすでに知られてい
る。In an image forming apparatus such as a copying machine, a document detection means having a plurality of light emitting parts and a light receiving part is provided below the document table, and a switch is used to detect when the document holding means for holding the document on the document table opens and closes. There is already known a device that detects the size of the document based on the detection signals of the document detection means when the document holding means is closed and when the document holding means is opened.
従来の原稿サイズ検知装置においては原稿押え手段の開
放位置を検知するスイッチを作動するアクチュエータが
原稿台上に突出する構造となるため、原稿を原稿台上に
セットしたり取外したりするときに、原稿の端部がアク
チュエータに接触し、原稿の破損やアクチュエータの故
障原因となるという問題があった。In conventional document size detection devices, the actuator that activates the switch that detects the open position of the document holding means protrudes above the document table. There was a problem in that the end of the document came into contact with the actuator, causing damage to the document and malfunction of the actuator.
又厚手の本等の原稿については原稿押え手段を完全に閉
鎖できず、閉位置を検出するスイッチを作動せず、開状
態のままで、複写動作が行われる場合には開状態で検知
した信号だけで原稿サイズを決定することになり、誤っ
たサイズに判断される場合があった。In addition, for documents such as thick books, the document holding means cannot be completely closed, the switch that detects the closed position is not activated, and the signal detected in the open state remains open when the copying operation is performed. The size of the original was determined based on the size of the original, which sometimes resulted in an incorrect size.
本発明は、上記の従来の問題点を解消し、原稿押え手段
の開放状態を検出するスイッチを設けることなく、厚手
原稿を含め常に原稿押え手段の開状態と閉状態のときの
原稿検知手段の検知信号を検知し、その検知信号に基づ
いて原稿サイズを検知することのできる装置を提供する
ことを課題としている。The present invention solves the above-mentioned conventional problems and eliminates the need to provide a switch for detecting the open state of the document holding means. An object of the present invention is to provide a device that can detect a detection signal and detect the document size based on the detection signal.
本発明は、上記の課題を、原稿台上の原稿を押えるため
の開閉動可能な原稿押え手段と、該原稿押え手段の閉状
態を検知する第１検知手段と、開状態を検知する第２検
知手段と、原稿台の下方に配置され原稿台に向けて発光
する発光部と原稿面からの反射光を受光する受光部とを
有する複数の原稿検知手段と、前記原稿押え手段の開位
置と閉位置において前記原稿検知手段による検知信号よ
り夫々原稿サイズを判断する制御手段とを有する画像形
成装置の原稿サイズ検知手段において、前記第２検知手
段が前記原稿検知手段のうち前記原稿押え手段の支点側
に一番近く最大サイズの原稿のみによりＯＮ、ＯＦＦさ
れる原稿検知手段と兼用されていることと、前記原稿押
え手段の開状態において記憶した原稿検知手段の信号と
、前記原稿押え信号の閉状態において記憶した原稿検知
手段の信号とにより原稿の存在を示す原稿検知手段の位
置を判定し、該判定結果と予め定めたサイズ決定データ
と比較して原稿サイズを判定することと、前記原稿押え
手段の閉状態を検出せず開状態のままで画像形成動作に
入ったときは駆動開始制御信号により原稿検知手段の信
号を検知し、前記閉状態において記憶する信号の代わり
として使用することを特徴とする画像形成装置の原稿サ
イズ検知装置により解決した。The present invention solves the above problems by providing a document holding device that can be opened and closed for holding the document on a document table, a first detection device that detects the closed state of the document holding device, and a second detection device that detects the open state of the document holding device. a detection means, a plurality of document detection means disposed below the document table and having a light emitting section that emits light toward the document table and a light receiving section that receives reflected light from the document surface; and an open position of the document holding means; In the document size detecting means of the image forming apparatus, the second detecting means is a fulcrum of the document holding means of the document detecting means, and a control means for determining the document size based on the detection signal from the document detecting means in the closed position. It is also used as a document detection means that is turned ON and OFF only by the largest size document closest to the side, and the signal of the document detection means stored in the open state of the document holding means and the close of the document holding signal. determining the position of the document detecting means indicating the presence of the document based on the signal of the document detecting means stored in the state, and determining the document size by comparing the determination result with predetermined size determination data; When the image forming operation is started without detecting the closed state of the means and the means remains open, the signal of the document detecting means is detected by the drive start control signal and used as a substitute for the signal stored in the closed state. This problem was solved by the original size detection device of the image forming apparatus.
複数の原稿検知手段の発光部を共通の１つの発光部とす
ることも可能である。It is also possible to use one common light emitting section as the light emitting sections of the plural document detection means.
本発明により、第２検知手段の代わりに用いられる原稿
検知手段、すなわち原稿検知手段の１つとして最も原稿
押え手段の支点側に近く、最大サイズの原稿のみにより
ＯＮ、ＯＦＦされる原稿検知手段がＯＦＦになることに
より原稿押さえ手段が開放したことを検知し、各原稿検
知手段の受光部による検知信号を記憶する。原稿が載せ
られない限り全ての原稿検知手段はＯＦＦである。According to the present invention, an original detecting means used in place of the second detecting means, that is, one of the original detecting means closest to the fulcrum side of the original holding means and turned on and off only by the largest size original is provided. By turning off, it is detected that the document holding means is released, and the detection signal from the light receiving section of each document detection means is stored. All document detection means are OFF unless a document is placed.
原稿が載せられると原稿のサイズ番こ対応する原稿検知
手段がＯＮになり原稿が存在したことを検知する。When a document is placed, the document detection means corresponding to the size number of the document is turned on to detect the presence of the document.
原稿検知手段の信号は読み取られて記憶される。The signal of the document detection means is read and stored.
原稿押え手段が閉したことを第１検知手段により検知す
ると、各原稿検知手段の受光部の検知信号を記憶し、開
状態の記憶した各原稿検知手段の検知信号と比較判断し
、各原稿検知手段の位置における原稿の存在の有無を判
定する。全ての原稿検知手段の位置の原稿の存在の有無
に基づいて予め定めたサイズ決定データに基づいて原稿
サイズが判定される。When the first detection means detects that the original holding means is closed, the detection signal of the light receiving section of each original detection means is stored and compared with the detection signal of each original detection means whose open state is stored, and each original detection means is detected. The presence or absence of a document at the position of the means is determined. The document size is determined based on predetermined size determination data based on the presence or absence of a document at the positions of all document detection means.
第１検知手段がＯＦＦのまま、つまり原稿押え手段が閉
しない状態で画像形成動作信号により画像作成動作に入
る場合には、駆動開始制御信号により画像形成装置の駆
動が開始される時点を第１検知手段がＯＮになった時点
と見なして各原稿検知手段の検知信号を読み取り記憶し
、開状態に記憶した各原稿検知手段の検知信号と比較判
断し、原稿の有無を判定し、更に所定のサイズ決定デー
夕に基づいて原稿サイズを判定する。When starting an image forming operation by an image forming operation signal while the first detecting means remains OFF, that is, when the original holding means is not closed, the first detecting means starts the driving of the image forming apparatus according to the drive start control signal. The detection signal of each original detection means is read and stored, assuming that the detection means is turned ON, and compared with the detection signal of each original detection means stored in the open state to determine the presence or absence of the original. The document size is determined based on the size determination data.
本発明により第２検知信号により原稿を傷つけることが
回避され、原稿押え手段が完全に閉しられない場合にも
確実に原稿サイズを検知することが可能になった。According to the present invention, damage to the original by the second detection signal is avoided, and the original size can be reliably detected even when the original pressing means is not completely closed.
本発明の詳細を図に示す実施例に基づいて説明する。 The details of the present invention will be explained based on embodiments shown in the drawings.
第１図及び第２図において、原稿１は原稿台２、例えば
コンタクトガラスの上に載置され、支点３のまわりに回
動可能なる原稿押え手段３、例えば圧仮により押えられ
る。In FIGS. 1 and 2, a document 1 is placed on a document table 2, such as a contact glass, and is held down by a document holding means 3, such as a presser, which is rotatable around a fulcrum 3. As shown in FIG.
原稿台２の下方には原稿ｌを露光する露光光学装置５が
配置され、露光光学装置５のレンズ６により原稿の光像
が図示しない感光体上に結像される。An exposure optical device 5 for exposing the document 1 is arranged below the document table 2, and a lens 6 of the exposure optical device 5 forms an optical image of the document on a photoreceptor (not shown).
原稿台２の下方には露光光学装置５のスキャナー衾う−
等の可動部材の邪魔にならない位置で原稿サイズを検知
するに都合のよい位置に複数の原稿検知手段６が配置さ
れる。原稿検知手段６の原稿に対する配置位置は平面図
においては第２図に示す如くであり、最小検知サイズを
Ａ５縦、最大検知サイズをＡ３横とするとき、■、■、
・・・・・・■で示す７個の位置に原稿検知手段６を設
ける。Below the document table 2 is the scanner of the exposure optical device 5.
A plurality of document detecting means 6 are arranged at positions convenient for detecting the document size at positions that do not interfere with movable members such as. The arrangement position of the document detection means 6 with respect to the document is as shown in FIG. 2 in a plan view, and when the minimum detection size is A5 portrait and the maximum detection size is A3 landscape,
. . . Document detection means 6 are provided at seven positions indicated by ■.
原稿検知手段６は、例えば第３図に示す如く原稿台に向
かって発光する発光部６ａ、例えば発光ダイオード６ａ
と原稿１よりの反射光を受光する受光部６ｂ例えばフォ
トトランジスタとにより構成することができる。発光部
６ａと受光部６ｂとを１組みとする原稿検知手段６を配
置することもできるが、複数の原稿検知手段６の発光部
を共通の１つの発光部とし、１つの発光部より投射され
る光の原稿よりの反射光を複数の受光部により受光する
構造とすることもできる。The document detection means 6 includes, for example, a light emitting section 6a, for example, a light emitting diode 6a, which emits light toward the document table as shown in FIG.
and a light receiving section 6b that receives reflected light from the original 1, such as a phototransistor. Although it is also possible to arrange the document detection means 6 including a light emitting section 6a and a light receiving section 6b as a set, the light emitting sections of the plurality of document detecting means 6 are used as one common light emitting section, and the light emitting section 6a and the light receiving section 6b are used as a common light emitting section. It is also possible to adopt a structure in which the reflected light from the original is received by a plurality of light receiving sections.
原稿台２を支持する本体７には原稿押え手段４が閉して
いることを検知する第１検知手段８としてスイッチ（Ｓ
ＷＩ）を設ける。The main body 7 that supports the document table 2 is provided with a switch (S
WI) will be established.
画像検知装置の制御部は例えば第４図に示すように制御
手段１１に原稿押え閉し検知スイッチ１２、操作部表示
手段１３、駆動手段１４、用紙すイズ選択機構１５が接
続された構造とすることができる。The control section of the image detection device has a structure in which, as shown in FIG. 4, for example, a control means 11 is connected to a document presser close detection switch 12, an operation section display means 13, a drive means 14, and a paper size selection mechanism 15. be able to.
第２図において夫々のサイズの原稿１を原稿台２の上に
原稿スケール９に合わせて載せた場合の原稿検知手段６
の検知信号と原稿サイズの関係を示すと第１表に示す如
くになる。In FIG. 2, the document detection means 6 when the document 1 of each size is placed on the document table 2 according to the document scale 9.
The relationship between the detection signal and the document size is shown in Table 1.
第１表
第１表において原稿検知手段は検知位置を示し、第２図
における原稿検知手段の位置を示す符号により表示する
。表内の○は原稿ｌからの反射光を検出し、原稿が有る
ことを検知したことを示し、は反射光を検知せず原稿が
無いことを検知したことを示す。例えば■〜■の全での
原稿検知手段６が原稿有りと検知すればＡ３サイズの原
稿が載っていることを示し■、■、■だけの原稿検知手
段が原稿有りを検知し、■、■、■、■について原稿無
しを検知した場合Ａ４縦サイズであることを示す。Table 1 In Table 1, the detection position of the document detection means is indicated by a symbol indicating the position of the document detection means in FIG. ○ in the table indicates that the reflected light from the original l was detected and the presence of the original was detected, and ○ indicates that the reflected light was not detected and the absence of the original was detected. For example, if all of the document detection means 6 from ■ to ■ detect that there is a document, it means that an A3 size document is loaded, and the document detection means only for ■, ■, and ■ detect the presence of a document, and , ■, ■ If no document is detected, it indicates that the document is A4 portrait size.
原稿押え手段４が開いた状態においては、原稿１がある
部分は光が反射し、原稿検知手段６の受光部６ｂに反射
光が入射するが、原稿１のない部分は光が反射しないの
で受光部６ｂに反射光が入射しない。従って反射光を検
知した原稿検知手段６がどれであるかにより第１表に示
すサイズ決定データに基づいて原稿のサイズを判断する
ことができる。しかるに原稿には画像部分があり、丁度
原稿検知手段による検知場所に黒色画像があると反射光
は受光せず、原稿がないと判断するため原稿サイズを正
しく認識できない場合がある。When the original holding means 4 is open, light is reflected from the part where the original 1 is located and the reflected light enters the light receiving section 6b of the original detection means 6, but the light is not reflected from the part where the original 1 is not present, so no light is received. No reflected light enters the portion 6b. Therefore, depending on which document detection means 6 detects the reflected light, the size of the document can be determined based on the size determination data shown in Table 1. However, the document has an image portion, and if a black image is present at the detection location by the document detecting means, the reflected light will not be received and it will be determined that there is no document, so the size of the document may not be recognized correctly.
そこで原稿押え手段４を閉した状態における原０
稿検知手段６による検知結果を参考にする。原稿枠え手
段４が閉した場合には原稿枠え手段４の裏面で光が反射
するため、原稿がなかった部分は原稿枠え手段４が開い
ている場合には反射光が受光されなっかたのに対し原稿
枠え手段４が閉しると反射光が受光され、原稿検知手段
６の検知信号は原稿枠え手段の開閉により変わることに
なる。又原稿の画像部分は原稿枠え手段の開放時も閉鎖
時も反射光は受光されないので原稿検知手段の検知信号
は変化しない。そこで原稿枠え手段の開放時と閉鎖時の
検知信号の変化を求めることにより、その原稿検知手段
が原稿有りを検知しているか原稿無しを検知しているか
を判断することができる。Therefore, the detection result by the original document detection means 6 with the document holding means 4 closed is used as a reference. When the document framer 4 is closed, light is reflected on the back surface of the document framer 4, so that the reflected light is not received in the area where there is no document if the document framer 4 is open. On the other hand, when the document framer 4 is closed, reflected light is received, and the detection signal of the document detector 6 changes depending on whether the document framer is opened or closed. Further, since no reflected light is received by the image portion of the document whether the document framer is opened or closed, the detection signal of the document detector does not change. Therefore, by determining the change in the detection signal when the document framing means is opened and closed, it is possible to determine whether the document detection means is detecting the presence of a document or the absence of a document.
検知信号の変化と原稿有無の判定の内容を示すと第２表
に示す如くである。Table 2 shows the changes in the detection signal and the determination of the presence or absence of a document.
第２表では第１表と同様○は原稿有り、−は原稿無しを
原稿検知手段が検知したことを示し、同し原稿検知手段
が原稿枠え手段の開時と閉時との検知信号の変化を示す
。In Table 2, as in Table 1, ○ indicates that the document is present, and - indicates that the document detection means has detected that there is no document. Show change.
第２表
原稿枠え手段４の開閉検知は、第１検知手段としてのス
イッチ８と、第２検知手段としての原稿検知手段のうち
原稿枠え手段４の支点３に一番近い１つの原稿検知手段
６、しかも一部大きいサイズの原稿、例えばＡ３を検知
するために第２図の■位置に設けた原稿検知手段を利用
する。スイ・ンチ８は原稿枠え手段４が閉していること
を検知し、■位置の原稿検知手段６は開いていることを
検知する。Table 2 Opening/closing detection of the document framing means 4 is performed by detecting one document closest to the fulcrum 3 of the document framing means 4 among the switch 8 as the first detection means and the document detection means as the second detection means. The means 6 uses the document detecting means provided at position 2 in FIG. 2 in order to detect some large-sized documents, for example A3. The switch 8 detects that the document frame means 4 is closed, and the document detecting means 6 at the position (3) detects that it is open.
原稿枠え手段４を開いていくとき、第２図の例では■位
置の原稿検知手段が一番最初に反射光を検知しなくなり
■位置の原稿検知手段は一番最後に反射光を検知しなく
なる。逆に原稿枠え手段４が開放状態から閉しるときに
は■位置の原稿検知手段６が最初に動作し、その後他の
位置の原稿検知手段６が作動する。原稿枠え手段４より
の反則光量が成るしきい値以下になれば原稿検知手段６
は反射光がないとしてＯＦＦの検知信号を出すようにす
れば、■位置の原稿検知手段６がＯＦＦになることによ
り全ての原稿検知手段６についてＯＦＦ信号が出される
。■位置の原稿検知手段６がＯＦＦになったことを検知
することにより原稿枠え手段６が開放状態になったと判
断することができる。When the document framer 4 is opened, in the example shown in FIG. It disappears. On the other hand, when the document framer 4 is closed from the open state, the document detector 6 in the position (3) operates first, and then the document detectors 6 in other positions operate. When the amount of foul light from the document framer 4 becomes less than the threshold value, the document detector 6
If it is assumed that there is no reflected light and outputs an OFF detection signal, the original detecting means 6 at the position ① turns OFF, so that all the original detecting means 6 output an OFF signal. By detecting that the document detecting means 6 at position (2) is turned off, it can be determined that the document framing means 6 is in the open state.
最大サイズの原稿が載った状態で原稿枠え手段４を開放
したときには開放状態になっても直ちに開放したことを
制御装置内では検知しないが、原稿を取り除くことによ
り直ちに開放状態を検知することができる。When the document frame means 4 is opened with the maximum size document placed on it, the control device does not immediately detect that it has been opened even if it becomes open; however, by removing the document, the open state can be immediately detected. can.
原稿が本等の如く厚手の原稿であり、原稿枠え手段２を
閉してもスイッチ８をＯＮするすることができない。こ
のような厚手原稿の場合はスイッチ８がＯＦＦのままで
プリント釦が押されて画像検知動作が開始する場合があ
る。このようなときは駆動開始制御信号により駆動が開
始される時点に原稿検知手段６の各受光部６ｂの検知信
号を読み取り記憶する。このデータをスイッチ８がＯＮ
になったときに読み取り記憶する信号のデータの代わり
として処理する。Since the original is a thick original such as a book, the switch 8 cannot be turned on even if the original framing means 2 is closed. In the case of such a thick original, the print button may be pressed and the image detection operation may be started while the switch 8 remains OFF. In such a case, the detection signals of each light receiving section 6b of the document detection means 6 are read and stored at the time when the drive is started by the drive start control signal. Switch 8 turns on this data.
It is processed as a substitute for the signal data to be read and stored when the
厚手原稿の場合はスイッチ８をＯＮにすることはできな
くても原稿枠え手段４は半ば閉した状態にあるので、原
稿検知手段６は原稿枠え手段４よりの反射光を検知する
ことができ、上記の第２表により判断するための信号と
して利用することはできる。In the case of a thick original, even if the switch 8 cannot be turned on, the original holding means 4 is in a half-closed state, so the original detecting means 6 cannot detect the light reflected from the original holding means 4. It can be used as a signal for making decisions based on Table 2 above.
原稿サイズの検出は第５図〜第７図に示すフローに従っ
て行われる。第５図に示すサブルーチンでは原稿枠え手
段４が開いているかをスイッチ（ＳＷＩ）８により検出
し、スイッチ８がＯＦＦで開いているときは、全ての原
稿検知手段がＯＦＦか、すなわち反射光が無いかどうか
をチエツクし、全部がＯＦＦのときは原稿は載っていな
いので、リソセト信号を出す。Detection of the document size is performed according to the flow shown in FIGS. 5 to 7. In the subroutine shown in FIG. 5, a switch (SWI) 8 detects whether or not the document framer 4 is open. When the switch 8 is OFF and open, all the document detection means are OFF, that is, the reflected light is not detected. Check to see if there is any, and if all are OFF, there is no original on it, so a reset signal is sent.
第６図に示すザブルーチン２ではリセット信号が出てい
るかどうかチエツクし、出ているときは、原稿検知手段
のいずれかの受光部がＯＮか否かを検知し、ＯＮなって
おれば原稿が載ったとして原稿検知手段の各受光部の信
号のＯＮ、ＯＦＦ状態、つまり開時データを読み取り、
データが変化していないかチエツクし、変化したときは
新しい開時データを記憶し、変化しないときはデータ読
み取りを続ける。In the subroutine 2 shown in Fig. 6, it is checked whether a reset signal is output, and if it is output, it is detected whether any of the light receiving parts of the document detection means is ON or not, and if it is ON, the document is loaded. For example, read the ON/OFF state of the signal of each light receiving part of the document detection means, that is, the open state data,
It checks whether the data has changed, and if it has changed, it stores new opening data, and if it has not changed, it continues reading the data.
第７図に示すサブルーチン３において、原稿押え手段４
が閉しられＳＷＩがＯＮになったかチエツクし、ＯＮに
なったときは原稿検知手段６の各受光部の信号のＯＮ、
ＯＦ Ｆ’状態、つまり閉時データを読み取り、すでに
記憶しである原稿押え手段の開時のデータと比較し、演
算し、演算結果を予め記憶しである、例えば第２表に示
す評価データに基づいて各受光部の紙の有無を判定し、
この判定結果がサイズ決定データに該当するかチエツク
し、該当しないときは該当サイズなしを表示し、該当す
る場合は該当するサイズを判定し必要なときは表示する
。In subroutine 3 shown in FIG.
is closed and the SWI is turned on, and when it is turned on, the signal of each light receiving part of the document detection means 6 is turned on.
The OF F' state, that is, the closed state data is read, compared with the already stored open state data of the original holding means, and calculated. The calculated results are stored in advance, and the evaluation data shown in Table 2 is Based on this, the presence or absence of paper in each light receiving area is determined,
It is checked whether this determination result corresponds to the size determination data, and if it does not correspond, the corresponding size is displayed, and if it corresponds, the corresponding size is determined and displayed if necessary.
５
ＳＷＩがＯＦＦでも画像形成の駆動開始信号が出たかど
うかチエツクし、出た場合はＳＷＩはＯＮではないが、
ＯＮに対応する状態と判断し、そのときの各受光部のＯ
Ｎ、ＯＦＦ信号を閉時データとして読み取り、以下ＳＷ
ＩがＯＮのときと同様に処理する。5 Even if SWI is OFF, check whether the image formation drive start signal is output, and if it is output, SWI is not ON, but
It is determined that the state corresponds to ON, and the O of each light receiving part at that time is
Read the N and OFF signals as closed data, and use SW as follows.
Processing is performed in the same way as when I is ON.
第５図〜第７図のフローは一例を示すもので特にこれに
限定するものではなく同様の作用及び効果が得られるも
のであれば随意に変形することができる。The flows shown in FIGS. 5 to 7 are examples, and are not particularly limited to these, and can be modified as desired as long as similar actions and effects can be obtained.
〔効果］
本発明により原稿押え手段の開放状態を検知する検知手
段はスイッチでなく、原稿検知手段の一つを兼用するた
め、原稿を損傷することを回避することができ、しかも
原稿サイズを確実に検知することができる。[Effects] According to the present invention, the detection means for detecting the open state of the document holding means is not a switch, but also serves as one of the document detection means, so it is possible to avoid damaging the document, and moreover, it is possible to ensure the document size. can be detected.
本発明により厚手原稿のように原稿押え手段が完全に閉
まらず、第１検知手段であるスイッチが作動しない状態
においても確実に原稿押え手段が閉の状態に対応する検
知信号を読み取ることができ、正確なサイズ判定が可能
になった。According to the present invention, it is possible to reliably read a detection signal corresponding to the closed state of the original holding means even in a state where the original holding means is not completely closed and the switch serving as the first detection means is not activated, such as with a thick original. Accurate size determination is now possible.
第１図は本発明に係る原稿サイズ検知装置を示す断面略
図、第２図は平面図、第３図は原稿検知手段の一例を示
す略図、第４図は制御装置のブロック図、第５図〜第７
図は制御フロー図である。
１・・・原稿
３・・・支点
６・・・原稿検知手段
８・・・第１検知手段
６ｂ・・・受光部
２・・・原稿台
４・・・原稿押え手段
７・・・本体
６ａ・・・発光部FIG. 1 is a schematic cross-sectional view showing a document size detection device according to the present invention, FIG. 2 is a plan view, FIG. 3 is a schematic diagram showing an example of document detection means, FIG. 4 is a block diagram of a control device, and FIG. ~7th
The figure is a control flow diagram. 1... Original 3... Fulcrum 6... Original detecting means 8... First detecting means 6b... Light receiving section 2... Original platen 4... Original holding means 7... Main body 6a ...Light emitting part
Claims (1)
押え手段と、該原稿押え手段の閉状態を検知する第１検
知手段と、開状態を検知する第２検知手段と、原稿台の
下方に配置され原稿台に向けて発光する発光部と原稿面
からの反射光を受光する受光部とを有する複数の原稿検
知手段と、前記原稿押え手段の開位置と閉位置において
前記原稿検知手段による検知信号より夫々原稿サイズを
判断する制御手段とを有する画像形成装置の原稿サイズ
検知手段において、 前記第２検知手段が前記原稿検知手段のうち前記原稿押
え手段の支点側に一番近く最大サイズの原稿のみにより
ＯＮ、ＯＦＦされる原稿検知手段と兼用されていること
と、前記原稿押え手段の開状態において記憶した原稿検
知手段の信号と、前記原稿押え信号の閉状態において記
憶した原稿検知手段の信号とにより原稿の存在を示す原
稿検知手段の位置を判定し、該判定結果と予め定めたサ
イズ決定データと比較して原稿サイズを判定することと
、前記原稿押え手段の閉状態を検出せず開状態のままで
画像形成動作に入ったときは駆動開始制御信号により原
稿検知手段受光部の信号を検知し、前記閉状態において
記憶する信号の代わりとして使用することを特徴とする
画像形成装置の原稿サイズ検知装置。(1) A document holding device that can be opened and closed to hold the document on the document table, a first detection device that detects the closed state of the document holding device, a second detection device that detects the open state of the document holding device, and a document table. a plurality of document detection means arranged below the document table and having a light emitting section that emits light toward the document table and a light receiving section that receives reflected light from the document surface; and detecting the document at the open position and the closed position of the document holding means. In the document size detecting means of the image forming apparatus, the second detecting means is the one closest to the fulcrum side of the document holding means among the document detecting means, and the second detecting means is the largest one of the document detecting means. It is also used as a document detection means that is turned ON and OFF only depending on the size of the document, and the signal of the document detection means is stored when the document holding means is in the open state, and the document detection means is stored when the document holding signal is in the closed state. determining the position of the document detecting means indicating the presence of the document based on a signal from the means, and comparing the determination result with predetermined size determination data to determine the document size; and detecting the closed state of the document holding device. When an image forming operation is started in the open state without opening, the signal of the light receiving section of the document detection means is detected by the drive start control signal, and the signal is used as a substitute for the signal stored in the closed state. Document size detection device of the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1284942A JPH03146938A (en) | 1989-11-02 | 1989-11-02 | Original size detecting device for image forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1284942A JPH03146938A (en) | 1989-11-02 | 1989-11-02 | Original size detecting device for image forming device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03146938A true JPH03146938A (en) | 1991-06-21 |
Family
ID=17685064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1284942A Pending JPH03146938A (en) | 1989-11-02 | 1989-11-02 | Original size detecting device for image forming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03146938A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008022160A (en) * | 2006-07-11 | 2008-01-31 | Kyocera Mita Corp | Image forming apparatus |
-
1989
- 1989-11-02 JP JP1284942A patent/JPH03146938A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008022160A (en) * | 2006-07-11 | 2008-01-31 | Kyocera Mita Corp | Image forming apparatus |
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