JPH0569984A - Sheet conveyance device - Google Patents
Sheet conveyance deviceInfo
- Publication number
- JPH0569984A JPH0569984A JP3234695A JP23469591A JPH0569984A JP H0569984 A JPH0569984 A JP H0569984A JP 3234695 A JP3234695 A JP 3234695A JP 23469591 A JP23469591 A JP 23469591A JP H0569984 A JPH0569984 A JP H0569984A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- recording medium
- mode
- conveyed
- roller
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は記録装置、特にカット紙
状の記録媒体を用いる記録装置における記録媒体の給紙
手段に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus, and more particularly to a recording medium feeding means in a recording apparatus using a recording medium in the form of cut paper.
【０００２】[0002]
【従来の技術】従来より、カット紙状の記録媒体の給紙
制御としては、いわゆるスキュー防止をおこなうため、
記録媒体を記録位置に保持すると共に記録媒体を副走査
方向に搬送する搬送ローラーとその搬送ローラーに圧接
して搬送力を発生する従動ローラーの圧接点に対して、
記録媒体をたわませて当接させた後、搬送ローラーを正
方向に回転させ行うという制御が行われてきた。その模
式図を図５に示す。３は給紙ローラー、４は給紙スタッ
カ、５は記録媒体、１は搬送ローラー、２は従動ローラ
ーであり、給紙ローラー３と搬送ローラー１とを搬送正
方向に回転させ、給紙ローラー３により給紙スタッカ４
上の記録媒体５をピックアップし、記録媒体５の先端が
搬送ローラー１と従動ローラー２の圧接点を通過するま
で正転する。その後、給紙ローラー３が給紙スタッカ４
に当接している間にその回転を停止し、搬送ローラー１
を搬送逆方向に回転し、記録媒体５の先端を搬送ローラ
ー１と従動ローラー２の圧接点から搬送方向上流側まで
戻す（図６、図７）。この時、記録媒体５は後ろを静止
した給紙ローラー３とそれに圧接した給紙スタッカ４に
より押えられているため、先端が後退した分、給紙ロー
ラー３と搬送ローラー１との間でたわんで、その先端は
搬送ローラー１と従動ローラー２の圧接点に全域にわた
って当接する。そして、搬送ローラー１と給紙ローラー
３を所定量正転させて記録媒体を印字位置まで搬送す
る。2. Description of the Related Art Conventionally, so-called skew prevention has been performed as a paper feed control for a cut paper recording medium.
For the pressure contact of the conveyance roller that holds the recording medium at the recording position and conveys the recording medium in the sub-scanning direction, and the driven roller that presses against the conveyance roller and generates a conveyance force,
After the recording medium is flexed and brought into contact with the recording medium, the conveyance roller is rotated in the forward direction. The schematic diagram is shown in FIG. 3 is a paper feed roller, 4 is a paper feed stacker, 5 is a recording medium, 1 is a transport roller, 2 is a driven roller, and the paper feed roller 3 and the transport roller 1 are rotated in the forward transport direction. Paper feed stacker 4
The upper recording medium 5 is picked up and normally rotated until the leading end of the recording medium 5 passes through the pressure contact points of the transport roller 1 and the driven roller 2. After that, the paper feed roller 3 is moved to the paper feed stacker 4
The rotation of the conveyance roller 1
Is rotated in the reverse direction of conveyance to return the leading end of the recording medium 5 from the pressure contact point of the conveyance roller 1 and the driven roller 2 to the upstream side in the conveyance direction (FIGS. 6 and 7). At this time, the recording medium 5 is pressed by the paper feed roller 3 which is stationary behind and the paper feed stacker 4 which is in pressure contact with it, so that the recording medium 5 is bent between the paper feed roller 3 and the transport roller 1 by the amount of the retreat of the leading end. , Its tip contacts the pressure contact points of the transport roller 1 and the driven roller 2 over the entire area. Then, the transport roller 1 and the paper feed roller 3 are normally rotated by a predetermined amount to transport the recording medium to the printing position.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記従
来例の給紙装置、および制御においては、記録媒体の先
端が搬送ローラー１と従動ローラー２の圧接点から搬送
方向上流側まで戻され、その２つのローラーに当接させ
スキュー防止をおこなっているため、カット紙等厚みが
均一に管理されたものでは非常に効果が見られたが、封
筒等の幾重にも折重ねられた、場所により折られた状態
の異なる、すなわち厚みの均一でない物に対しては、図
４に示すような、搬送ローラー１と従動ローラー２の圧
接点から搬送方向上流側まで戻され、ニップに当接した
時の先端の位置が図４の紙面垂直方向の場所により異な
るため、逆送せずにストレートに搬送する場合に比較し
て、この制御方法をとることにより余計にスキューして
しまうという欠点があった。また厚みがあり腰の強い紙
においては、記録媒体の先端を搬送ローラー１と従動ロ
ーラー２の圧接点から搬送方向上流側まで戻そうと搬送
ローラーを逆転させても、腰が強いため、給紙ローラー
との間でのたわみが形成できず、戻しきらないでスリッ
プしてしまい、正転して所定の印字開始位置に搬送する
ために所定の量搬送ローラーを回転させると、送りすぎ
てしまうという欠点があった。However, in the above-described conventional sheet feeding device and control, the leading end of the recording medium is returned from the pressure contact points of the transport roller 1 and the driven roller 2 to the upstream side in the transport direction, and the second Since it is brought into contact with two rollers to prevent skewing, it was very effective with cut sheets of uniform thickness, but envelopes were folded in multiple layers and could be folded depending on the location. For objects having different states, that is, having a non-uniform thickness, the tip when returned to the upstream side in the transport direction from the pressure contact point of the transport roller 1 and the driven roller 2 as shown in FIG. 4 differs depending on the position in the direction perpendicular to the paper surface of FIG. 4, and therefore, this control method causes an additional skew as compared with the case of straight conveyance without reverse feeding. There was. In addition, in the case of thick and stiff paper, even if the transport roller is reversed in order to return the leading edge of the recording medium from the pressure contact point of the transport roller 1 and the driven roller 2 to the upstream side in the transport direction, the paper is still stiff. It cannot be bent with the roller and slips without returning, and if the transport roller is rotated a predetermined amount to rotate forward and transport to the predetermined print start position, it will be sent too much. There was a flaw.
【０００４】[0004]
【課題を解決するための手段】本発明は以上のことを鑑
み、どんな記録媒体でもスキューを最小限にした良好な
給紙動作を行えることを目的とする。SUMMARY OF THE INVENTION In view of the above, it is an object of the present invention to perform a favorable paper feeding operation with a minimum skew on any recording medium.
【０００５】上記目的を達成する本発明の構成は、シー
トを挟持して搬送する一対の搬送回転体と、所定方向に
送られてきたシートを前記一対の回転体により、挟持し
た後、逆方向に搬送し、シート先端を前記搬送回転体の
ニップ部に当接させた状態にしてからさらにシートを所
定方向に搬送する第１のモードと、送られてきたシート
を、逆方向に搬送することなく、前記一対の搬送回転体
により所定方向に搬送する第２のモードとを有し、第
１、第２のいずれかのモードでシートを搬送するように
前記一対の搬送回転体を制御する制御手段と、を有する
ことを特徴とするシート搬送装置である。The structure of the present invention that achieves the above-mentioned object is such that a pair of conveying rotary members for nipping and conveying a sheet and a sheet fed in a predetermined direction are nipped by the pair of rotary members and then in the opposite direction. The first mode in which the sheet is conveyed in the predetermined direction after the leading edge of the sheet is brought into contact with the nip portion of the conveying rotating body, and the conveyed sheet is conveyed in the opposite direction. And a second mode in which the pair of conveying rotary bodies conveys the sheet in a predetermined direction, and a control for controlling the pair of conveying rotary bodies so as to convey the sheet in either the first mode or the second mode. And a sheet conveying device.
【０００６】[0006]
【実施例】図１は本発明の構成の装置の一例を示すもの
である。１は記録媒体（シート）を記録位置に保持する
と共に前記記録媒体を副走査方向に搬送する搬送ローラ
ー（プラテン）、２は前記搬送ローラー１に記録媒体を
圧接して搬送力を発生する従動ローラー、３は給紙ロー
ラー、４は記録する記録媒体をスタックする給紙スタッ
カ、５は記録媒体、６は記録媒体の有無を検知する反射
型フォトセンサー等の記録媒体センサー、７は超音波セ
ンサー等の記録媒体厚みセンサー、である。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of an apparatus having the structure of the present invention. Reference numeral 1 denotes a conveyance roller (platen) that holds a recording medium (sheet) at a recording position and conveys the recording medium in the sub-scanning direction. Reference numeral 2 denotes a driven roller that presses the recording medium against the conveyance roller 1 to generate a conveying force. 3 is a paper feed roller, 4 is a paper feed stacker for stacking recording media for recording, 5 is a recording medium, 6 is a recording medium sensor such as a reflective photo sensor for detecting the presence or absence of the recording medium, and 7 is an ultrasonic sensor or the like. Recording medium thickness sensor of.
【０００７】給紙信号により給紙動作が開始されると、
搬送ローラー１および給紙ローラー３が搬送正方向に回
転し、給紙スタッカ４上の記録媒体５が給紙ローラー３
によりピックアップされ、その先端が記録媒体センサー
６により検知されると、それと同時に記録媒体５の厚み
が記録媒体厚みセンサー７により読み取られる。通常の
カット紙の厚みは０．１ｍｍ程度、封筒などの厚みは
０．５ｍｍ以上であるので容易に識別できる。記録媒体
の種類が識別され、それがカット紙であると判断される
と、従来と同様なスキュー防止制御を行う。封筒等厚み
のあるものであると判断すると、そのまま搬送ローラー
１、給紙ローラー３を搬送正方向に所定量回転させ記録
媒体５の先端部を所定の印字開始位置Ａにまで搬送す
る。When the paper feed operation is started by the paper feed signal,
The transport roller 1 and the paper feed roller 3 rotate in the forward transport direction, and the recording medium 5 on the paper feed stacker 4 moves to the paper feed roller 3
When the recording medium sensor 6 detects the leading edge of the recording medium 5, the thickness of the recording medium 5 is simultaneously read by the recording medium thickness sensor 7. A normal cut sheet has a thickness of about 0.1 mm and an envelope has a thickness of 0.5 mm or more, so that it can be easily identified. When the type of the recording medium is identified and it is determined that it is a cut sheet, the skew prevention control similar to the conventional one is performed. When it is determined that the envelope has a certain thickness, the transport roller 1 and the paper feed roller 3 are rotated as they are in the transport forward direction by a predetermined amount, and the leading end portion of the recording medium 5 is transported to a predetermined print start position A.
【０００８】搬送ローラー１はプラテンを兼ねている。
１０は記録ヘッドであり、本実施例においては熱エネル
ギーによってインクを気化し、そのエネルギーによって
インク液滴を吐出させるバブルジェット方式のヘッドを
用いている。１１は記録ヘッド１０が搬送方向と直角な
方向に走査を行うために、記録ヘッド１０を案内するガ
イドである。１２、１３はシートガイドである。The transport roller 1 also serves as a platen.
Reference numeral 10 is a recording head, and in this embodiment, a bubble jet type head is used which vaporizes ink by heat energy and ejects ink droplets by the energy. Reference numeral 11 is a guide for guiding the recording head 10 so that the recording head 10 scans in a direction perpendicular to the transport direction. 12 and 13 are sheet guides.
【０００９】図２に回路図を示す。２１はシートの給送
を制御する制御部、２２は給紙ローラーを駆動するモー
タ、２３は搬送ローラー１を駆動するモータである。FIG. 2 shows a circuit diagram. Reference numeral 21 is a control unit that controls the feeding of sheets, 22 is a motor that drives the paper feed roller, and 23 is a motor that drives the transport roller 1.
【００１０】次に図３のフローチャートに従って本実施
例の作動を説明する。Next, the operation of this embodiment will be described with reference to the flow chart of FIG.
【００１１】給紙開始信号が発せられるとステップＳ１
において給紙ローラ３、搬送ローラ１を図１において時
計まわりに回転させるようにモータ２２、２３を作動さ
せる。ステップＳ２でセンサー６により、シート先端を
検知すると厚みセンサー７によりシートの厚みを検知す
る。厚みセンサー７は超音波によりセンサー自体とシー
ト表面までの距離を測定する。その距離が所定値以下だ
と厚い紙がきたと判断する。When a paper feed start signal is issued, step S1
At 2, the motors 22 and 23 are operated so as to rotate the paper feed roller 3 and the transport roller 1 clockwise in FIG. When the sensor 6 detects the leading edge of the sheet in step S2, the thickness sensor 7 detects the thickness of the sheet. The thickness sensor 7 measures the distance between the sensor itself and the sheet surface by ultrasonic waves. If the distance is less than a predetermined value, it is determined that thick paper has come.
【００１２】厚みが所定値以下、すなわち通常のカット
シートの場合は、シート先端が搬送ローラ対１、２の圧
接点より長さＬ1だけ下流側に位置するまで送り（ステ
ップＳ４）、給紙ローラ３、搬送ローラ１を停止する。
次にシート先端が圧接点を抜けるのに十分な、Ｌ1以上
の距離を逆方向に搬送するために、搬送ローラ１を所定
量逆回転（反時計まわり）させる（ステップ５）。する
とシートは、先端が搬送ローラ対１、２の圧接点につき
当てられ、搬送ローラ対１、２と給紙ローラ３との間で
ループを形成したことになる。次にシート先端部の第１
行目が印字されるべき部分が搬送ローラ１と記録ヘッド
１０の間の記録位置にくるまで搬送ローラ１を正方向に
回転させる。そしてヘッドにより１行分の印字がなされ
るごとにシートを所定長さづつ送り、印字が終わったら
シートを排出する。When the thickness is less than a predetermined value, that is, in the case of a normal cut sheet, the sheet is fed until the leading edge of the sheet is located downstream of the pressure contact of the conveying roller pair 1, 2 by a length L 1 (step S4), and the sheet is fed. The roller 3 and the transport roller 1 are stopped.
Next, in order to convey the sheet in the reverse direction by a distance of L 1 or more, which is sufficient for the leading edge of the sheet to pass through the pressure contact, the conveying roller 1 is reversely rotated (counterclockwise) by a predetermined amount (step 5). Then, the leading edge of the sheet is abutted on the pressure contact points of the pair of conveying rollers 1 and 2, and a loop is formed between the pair of conveying rollers 1 and 2 and the sheet feeding roller 3. Next, the first
The transport roller 1 is rotated in the forward direction until the portion where the line is to be printed reaches the recording position between the transport roller 1 and the recording head 10. Then, each time the head prints one line, the sheet is fed by a predetermined length, and when the printing is completed, the sheet is discharged.
【００１３】ステップＳ３において、シートの厚みが所
定より大きい場合はそのままシートを記録以値まで送
り、印字を行う。In step S3, when the thickness of the sheet is larger than the predetermined value, the sheet is sent as it is up to the recording level and printing is performed.
【００１４】このように、記録媒体の厚みを検知し、そ
れにより給紙モードを切り替えれば、記録媒体によら
ず、スキューを最小限に押えた精度のよい給紙動作が可
能である。As described above, if the thickness of the recording medium is detected and the sheet feeding mode is switched according to the detected thickness, it is possible to carry out the sheet feeding operation with high accuracy while keeping the skew to a minimum regardless of the recording medium.
【００１５】上記実施例においては、給紙モードの切り
替えを記録媒体厚みセンサーを用いて行ったが、記録媒
体厚みセンサーを用いる代わりに、操作パネルより記録
装置のユーザーが給紙モードを切り替えるような装置で
あってもよいのはいうまでもない。In the above embodiment, the paper feed mode is switched using the recording medium thickness sensor. However, instead of using the recording medium thickness sensor, the user of the recording apparatus switches the paper feeding mode from the operation panel. It goes without saying that it may be a device.
【００１６】その実施例を図４に示す。図２の異なって
いる点は厚みセンサー７の代わりにスイッチ７が設けら
れ、ユーザーがこのスイッチにより普通紙モードと厚紙
モードを切り換える。スイッチ７により普通紙モードを
選択するとステップＳ２の後Ｓ４〜Ｓ６の制御が行わ
れ、厚紙モードを選択するとステップＳ７の制御が行わ
れる。An example thereof is shown in FIG. 2 is different from FIG. 2 in that a switch 7 is provided instead of the thickness sensor 7, and the user switches between the plain paper mode and the thick paper mode by this switch. When the plain paper mode is selected by the switch 7, the control of S4 to S6 is performed after step S2, and when the thick paper mode is selected, the control of step S7 is performed.
【００１７】[0017]
【発明の効果】以上述べてきたように、本発明による
と、どんな記録媒体でもスキューを最小限にした良好な
給紙動作を行える記録装置を提供できる。As described above, according to the present invention, it is possible to provide a recording apparatus capable of performing a favorable paper feeding operation with a minimum skew on any recording medium.
【図１】本実施例の給紙装置の構成を示す図。FIG. 1 is a diagram showing a configuration of a sheet feeding device of the present embodiment.
【図２】本実施例の制御ブロック図。FIG. 2 is a control block diagram of the present embodiment.
【図３】本実施例の給紙装置のフローチャートを示す。FIG. 3 shows a flowchart of the paper feeding device of the present embodiment.
【図４】他の実施例の制御ブロック図。FIG. 4 is a control block diagram of another embodiment.
【図５】従来の給紙装置の給紙動作を示す。FIG. 5 shows a paper feeding operation of a conventional paper feeding device.
【図６】従来の給紙装置の給紙動作を示す。FIG. 6 shows a sheet feeding operation of a conventional sheet feeding device.
【図７】従来の給紙装置の給紙動作を示す。FIG. 7 shows a paper feeding operation of a conventional paper feeding device.
【図８】従来の給紙装置の給紙動作における封筒給紙の
詳細図を示す。FIG. 8 is a detailed view of envelope sheet feeding in the sheet feeding operation of the conventional sheet feeding device.
１ 搬送ローラー ２ 従動ローラー ３ 給紙ローラー ４ 給紙スタッカ ５ 記録媒体 ６ 記録媒体センサー ７ 記録媒体厚みセンサー 1 transport roller 2 driven roller 3 paper feed roller 4 paper feed stacker 5 recording medium 6 recording medium sensor 7 recording medium thickness sensor
Claims (3)
転体と、 所定方向に送られてきたシートを前記一対の回転体によ
り、挟持した後、逆方向に搬送し、シート先端を前記搬
送回転体のニップ部に当接させた状態にしてからさらに
シートを所定方向に搬送する第１のモードと、送られて
きたシートを、逆方向に搬送することなく、前記一対の
搬送回転体により所定方向に搬送する第２のモードとを
有し、第１、第２のいずれかのモードでシートを搬送す
るように前記一対の搬送回転体を制御する制御手段と、 を有することを特徴とするシート搬送装置。1. A pair of conveying rotary members for nipping and conveying a sheet, and a sheet conveyed in a predetermined direction is nipped by the pair of rotating bodies and then conveyed in the opposite direction to convey the sheet front end by the conveying. The first mode in which the sheet is further conveyed in a predetermined direction after being brought into contact with the nip portion of the rotating body, and the conveyed sheet is conveyed by the pair of conveying rotating bodies without being conveyed in the opposite direction. A second mode of carrying the sheet in a predetermined direction, and a control means for controlling the pair of carrying rotary bodies so as to carry the sheet in either the first mode or the second mode. Sheet transport device.
知手段を有し、前記制御手段は、前記検知手段の検知信
号に応じてモードを切換えるように構成されたことを特
徴とする請求項１記載のシート搬送装置。2. A detection means for detecting the thickness of a sheet sent in, wherein the control means is configured to switch modes in accordance with a detection signal from the detection means. The sheet conveying apparatus according to item 1.
換手段を有することを特徴とする請求項１記載のシート
搬送装置。3. The sheet conveying apparatus according to claim 1, further comprising switching means for switching the control mode of the control means.
Priority Applications (13)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3234695A JPH0569984A (en) | 1991-09-13 | 1991-09-13 | Sheet conveyance device |
| US07/932,569 US5982400A (en) | 1991-08-22 | 1992-08-20 | Sheet feeding apparatus and image forming system |
| DE69220734T DE69220734T2 (en) | 1991-08-22 | 1992-08-21 | Sheet guide device and imaging system |
| AT92114325T ATE155110T1 (en) | 1991-08-22 | 1992-08-21 | SHEET GUIDE DEVICE AND IMAGE PRODUCTION SYSTEM |
| EP96107496A EP0733567B1 (en) | 1991-08-22 | 1992-08-21 | Recording system |
| DE69231772T DE69231772T2 (en) | 1991-08-22 | 1992-08-21 | Sheet feeder |
| EP96107495A EP0733566B1 (en) | 1991-08-22 | 1992-08-21 | Sheet feeding apparatus |
| EP92114325A EP0529538B1 (en) | 1991-08-22 | 1992-08-21 | Sheet feeding apparatus and image forming system |
| AT96107495T ATE200261T1 (en) | 1991-08-22 | 1992-08-21 | SHEET FEEDER |
| DE69231638T DE69231638T2 (en) | 1991-08-22 | 1992-08-21 | Recording system |
| AT96107496T ATE198586T1 (en) | 1991-08-22 | 1992-08-21 | RECORDING SYSTEM |
| US08/468,423 US6092893A (en) | 1991-08-22 | 1995-06-06 | Sheet feeding apparatus and image forming system |
| US08/467,166 US6257692B1 (en) | 1991-08-22 | 1995-06-06 | Image forming system with sheet feeding speed control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3234695A JPH0569984A (en) | 1991-09-13 | 1991-09-13 | Sheet conveyance device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0569984A true JPH0569984A (en) | 1993-03-23 |
Family
ID=16974968
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3234695A Pending JPH0569984A (en) | 1991-08-22 | 1991-09-13 | Sheet conveyance device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0569984A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000351488A (en) * | 1999-04-06 | 2000-12-19 | Canon Inc | Recorder |
| US6619647B2 (en) * | 2001-07-21 | 2003-09-16 | Kolbus Gmbh & Co. Kg | Device for loading a feeder rack |
| JP2007031099A (en) * | 2005-07-28 | 2007-02-08 | Canon Inc | Sheet transporting device and image forming device |
-
1991
- 1991-09-13 JP JP3234695A patent/JPH0569984A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000351488A (en) * | 1999-04-06 | 2000-12-19 | Canon Inc | Recorder |
| US6619647B2 (en) * | 2001-07-21 | 2003-09-16 | Kolbus Gmbh & Co. Kg | Device for loading a feeder rack |
| JP2007031099A (en) * | 2005-07-28 | 2007-02-08 | Canon Inc | Sheet transporting device and image forming device |
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