JP2003154643A - Ink jet recorder - Google Patents
Ink jet recorderInfo
- Publication number
- JP2003154643A JP2003154643A JP2001359696A JP2001359696A JP2003154643A JP 2003154643 A JP2003154643 A JP 2003154643A JP 2001359696 A JP2001359696 A JP 2001359696A JP 2001359696 A JP2001359696 A JP 2001359696A JP 2003154643 A JP2003154643 A JP 2003154643A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- paper
- conveying
- recording
- ink jet
- 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.)
- Granted
Links
Landscapes
- Ink Jet (AREA)
- Handling Of Cut Paper (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Registering Or Overturning Sheets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、インクジェット記
録装置に関し、特に、両面印字を実施するインクジェッ
ト記録装置の用紙搬送方式に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet recording apparatus, and more particularly to a paper feeding method for an ink jet recording apparatus that performs double-sided printing.
【０００２】[0002]
【従来の技術】従来、インクジェット記録装置において
は、給紙部において用紙を記録位置に給紙し、記録部に
おいて記録ヘッドを駆動して用紙に記録を行い、記録後
の用紙は排紙部より装置外に排出される。このようなイ
ンクジェット記録装置では、用紙の片面のみの記録が可
能であり、両面に記録を行う場合は、片面の記録が終了
した後、排出された用紙を表裏反対にして再度給紙して
両面記録を行っていた。2. Description of the Related Art Conventionally, in an ink jet recording apparatus, a sheet is fed to a recording position in a sheet feeding section, a recording head is driven in the recording section to record on the sheet, and the sheet after recording is discharged from a sheet discharging section. It is discharged to the outside of the device. With such an ink jet recording apparatus, it is possible to record on only one side of the paper.When recording on both sides, after the recording on one side is completed, the ejected paper is turned upside down and fed again. I was recording.
【０００３】しかしながら、この方法では用紙の両面に
記録を行う場合、片面記録後に記録された用紙を使用者
が取り出して再度給紙しなければならない。即ち、使用
者がインクジェット記録装置のそばについて片面記録さ
れた用紙を１枚１枚表裏反対にして再給紙しなければな
らないため作業が煩わしかった。また、片面にしか記録
を行えないため用紙の使用量が多くなり、用紙の無駄遣
いとなって、エコロジーに反する結果となっている。However, according to this method, when recording is performed on both sides of a sheet, the user must take out the recorded sheet after single-sided recording and feed it again. That is, since the user has to re-feed each side of the ink-jet recording apparatus with one side of the sheet recorded on one side, the operation is troublesome. Further, since recording can be performed on only one side, the amount of paper used increases, resulting in waste of paper, which is contrary to ecology.
【０００４】上記不具合を解消して両面印写を可能にし
たインクジェット記録装置としては、特開平７−１４９
００９号公報の「インクジェット記録装置」がある。こ
のインクジェット記録装置は、用紙を供給して正転駆動
する搬送手段によって記録位置に搬送して片面に記録し
た後、用紙はガイド手段によって反転搬送される。その
後、搬送手段を逆転駆動して用紙の表裏を反対にしたま
ま搬送して裏面側に記録した後、装置外に排出すること
によって、スループットを向上させている。As an ink jet recording apparatus which eliminates the above-mentioned problems and enables double-sided printing, Japanese Patent Application Laid-Open No. 7-149 is known.
There is an "ink jet recording device" in Japanese Patent No. 009. In this ink jet recording apparatus, the sheet is fed to the recording position by the feeding unit that feeds the sheet and rotates in the forward direction to print on one side, and then the sheet is inverted and fed by the guide unit. After that, the conveying means is driven in reverse to convey the sheet with the front side and the reverse side thereof being recorded, and after recording on the back side, the sheet is discharged out of the apparatus to improve the throughput.
【０００５】また、特開２０００−１０１０号公報の
「インクジェット記録装置」は、まず表面を印字し、一
旦用紙を装置外に排出し、排出された用紙をスイッチバ
ック方式で反転して再給紙し、印字することによって用
紙の両面に印字するようにしている。Further, in the "ink jet recording apparatus" of Japanese Patent Laid-Open No. 2000-1010, first, the front side is printed, the paper is once ejected out of the apparatus, the ejected paper is reversed by a switchback method, and the paper is re-fed. However, by printing, both sides of the paper are printed.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、特開平
７−１４９００９号公報の「インクジェット記録装置」
の場合、用紙反転部分をユニット化することが困難であ
り、用紙後端に余白（書き込めない部分）が発生してし
まう。However, the "ink jet recording apparatus" disclosed in Japanese Patent Laid-Open No. 7-149009.
In this case, it is difficult to unitize the paper reversal portion, and a blank space (a portion that cannot be written) occurs at the trailing edge of the paper.
【０００７】また、特開２０００−１０１０号公報の
「インクジェット記録装置」の場合、一旦用紙が排出さ
れるために、そのとき用紙が取り除かれたり、外因によ
り汚されたり破損したりする危険が大きい。また、スイ
ッチバック方式の再給紙機構を採用しており、機構の複
雑さ、搬送路が長くなり、両面印字の生産性、用紙搬送
の信頼性は低くなってしまう。Further, in the case of the "ink jet recording apparatus" of Japanese Patent Laid-Open No. 2000-1010, since the paper is once ejected, there is a great risk that the paper will be removed at that time, or it will be soiled or damaged due to external factors. . Further, since the switchback type re-feeding mechanism is adopted, the mechanism is complicated and the conveying path becomes long, so that the productivity of double-sided printing and the reliability of sheet conveyance are lowered.
【０００８】本発明は、上述の実情に鑑みてなされたも
のであって、用紙の後端に余白が生じない印字方式を提
供するとともに、両面生産性のよい反転ユニットを備え
たインクジェット記録装置を提供することを目的とす
る。The present invention has been made in view of the above circumstances, and provides a printing method in which a blank space does not occur at the trailing edge of a sheet, and an ink jet recording apparatus provided with a reversing unit having good double-sided productivity. The purpose is to provide.
【０００９】また、本発明は、両面印字を行うときに、
用紙の安定した搬送を提供することによって安定した画
質を提供し、信頼性、品質の良いインクジェット記録装
置を提供することを目的とする。Further, the present invention, when performing double-sided printing,
An object of the present invention is to provide a reliable image quality by providing stable image quality by providing stable conveyance of a paper sheet.
【００１０】また、用紙が薄いと、両面印字を実施する
ときに吸着ベルトに巻き付いてしまう危険性があるの
で、本発明は、用紙を吸着ベルトから分離させやすい機
構を提供することを目的とする。Further, if the paper is thin, there is a risk that it will be wrapped around the suction belt when performing double-sided printing. Therefore, it is an object of the present invention to provide a mechanism for easily separating the paper from the suction belt. .
【００１１】[0011]
【課題を解決するための手段】上記課題を達成するため
に、本発明の請求項１は、インクジェットヘッドからイ
ンク滴を吐出させて用紙上に画像を記録する記録手段
と、前記用紙を吸着させて前記記録手段に搬送するため
の正逆方向に駆動可能な搬送手段と、記録後の用紙を反
転させて再度前記記録手段に搬送する反転搬送手段とか
らなるインクジェット記録装置において、前記搬送手段
を正方向に駆動して前記記録手段で前記用紙に記録した
後、前記搬送手段を逆方向へ駆動し、前記反転搬送手段
へ前記用紙を搬送することによって用紙の両面に記録す
ることを特徴とする。また、本発明の請求項２は、請求
項１に記載のインクジェット記録装置において、前記用
紙を前記反転搬送手段に導くための切り替え手段を設
け、前記切り替え手段は、前記用紙の表面に記録すると
きにはこの用紙によって押し上げられて搬送路を確保
し、前記用紙の裏面に記録するときには自重によって前
記用紙の搬送路を切り替えて前記反転搬送手段へ搬送す
るようにしたことを特徴とする。また、本発明の請求項
３は、請求項１または２に記載のインクジェット記録装
置において、前記搬送手段と前記切り替え手段との間に
前記用紙の先端および後端を検知するための検知手段を
設け、前記検知手段で前記用紙の後端が検知されるまで
前記搬送手段を正方向に駆動して前記記録手段で前記用
紙に記録した後、前記検知手段で前記用紙の後端が検知
されると、前記搬送手段を逆方向へ駆動し、前記切り替
え手段を介して前記反転搬送手段へ前記用紙を搬送する
ことを特徴とする。また、本発明の請求項４は、請求項
３に記載のインクジェット記録装置において、前記搬送
手段の搬送面よりも前記用紙の先端が下方となるように
前記検知手段を配置したことを特徴とする。また、本発
明の請求項５は、請求項１乃至４のいずれか１に記載の
インクジェット記録装置において、前記搬送手段は、前
記用紙の後端の少なくとも１ｍｍ以上の範囲で吸着力を
通常よりも少なく、あるいはなくすことを特徴とする。In order to achieve the above object, the first aspect of the present invention is directed to a recording means for ejecting ink droplets from an ink jet head to record an image on a sheet and adsorbing the sheet. In the ink jet recording apparatus, the conveying means is configured to be capable of being driven in the forward and reverse directions for conveying to the recording means, and the reversing conveying means for reversing the sheet after recording and conveying it to the recording means again. After being driven in the forward direction to record on the sheet by the recording unit, the conveying unit is driven in the reverse direction and the sheet is conveyed to the reverse conveying unit to perform recording on both sides of the sheet. . According to a second aspect of the present invention, in the ink jet recording apparatus according to the first aspect, a switching unit for guiding the sheet to the reversing and conveying unit is provided, and the switching unit, when recording on the front surface of the sheet. This paper is pushed up by this paper to secure a transportation path, and when recording on the back surface of the paper, the transportation path of the paper is switched by its own weight and the paper is transported to the reversing transportation means. According to a third aspect of the present invention, in the ink jet recording apparatus according to the first or second aspect, a detection unit for detecting the leading edge and the trailing edge of the sheet is provided between the conveying unit and the switching unit. When the trailing edge of the sheet is detected by the detecting section after the conveying section is driven in the forward direction to record on the sheet by the recording section until the trailing edge of the sheet is detected by the detecting section The conveyance means is driven in the reverse direction, and the sheet is conveyed to the reversal conveyance means via the switching means. Further, a fourth aspect of the present invention is characterized in that, in the ink jet recording apparatus according to the third aspect, the detecting means is arranged such that a front end of the sheet is below a conveying surface of the conveying means. . According to a fifth aspect of the present invention, in the ink jet recording apparatus according to any one of the first to fourth aspects, the conveying unit has a suction force higher than usual in a range of at least 1 mm at the rear end of the paper. Characterized by less or no.
【００１２】したがって、搬送手段に吸着ベルトを採用
したことにより、両面印字実施時でも用紙の後端の余白
を無くすことが可能となった。また、搬送路も極端に長
くなく、簡略化された構成であり、低コスト、両面印字
の生産性も相対的に向上させることが可能となった。ま
た、用紙を吸着ベルトに密着させるので、搬送信頼性、
コックリングの発生の低減効果が得られた。用紙裏面へ
の記録の際、用紙の先端の吸着力を通常よりも弱くして
いるので吸着ベルトからの分離性が向上し、薄紙などの
腰の弱い用紙でも両面印字が可能となった。Therefore, by using the suction belt as the conveying means, it is possible to eliminate the blank space at the trailing edge of the paper even when performing double-sided printing. In addition, the transport path is not extremely long and has a simplified structure, which makes it possible to relatively improve the productivity of double-sided printing at low cost. Also, since the paper is brought into close contact with the suction belt, the transport reliability,
The effect of reducing the occurrence of cockling was obtained. When recording on the back side of the paper, the suction force at the tip of the paper is weaker than usual, improving the separability from the suction belt and enabling double-sided printing even on weak paper such as thin paper.
【００１３】[0013]
【発明の実施の形態】以下、図面を参照して本発明のイ
ンクジェット記録装置の一実施の形態を説明する。図１
は、本発明のインクジェット記録装置の用紙搬送および
記録部分の概略構成を上から見た平面図を示し、図２
は、この概略構成を横から見た断面図を示す。図１およ
び図２のインクジェット記録装置は、インクジェットヘ
ッドからインク滴を吐出させて用紙上に画像を記録する
記録手段（キャリッジ８）と、用紙を吸着させて記録手
段に搬送するための正逆方向に駆動可能な搬送手段（吸
着ベルト７、駆動ローラ５、従動ローラ６、帯電ローラ
１５）と、記録後の用紙を反転させて再度記録手段に搬
送する反転搬送手段（反転ローラ１２、加圧ローラ１
３）と、用紙を反転搬送手段に導くための切り替え手段
（切り替え板１４）と、搬送手段と切り替え手段との間
に用紙の先端および後端を検知するための検知手段（レ
ジストセンサ１０）とを含んでいる。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an ink jet recording apparatus of the present invention will be described below with reference to the drawings. Figure 1
2 is a plan view of a schematic configuration of a sheet conveying and recording portion of the inkjet recording apparatus of the present invention as seen from above, and FIG.
Shows a cross-sectional view of this schematic configuration as seen from the side. The inkjet recording apparatus shown in FIGS. 1 and 2 includes a recording unit (carriage 8) that ejects ink droplets from an inkjet head to record an image on a sheet, and forward and reverse directions for adsorbing the sheet and conveying the sheet to the recording unit. Transporting means (suction belt 7, driving roller 5, driven roller 6, charging roller 15) and reversing transporting means (reversing roller 12, pressure roller) for reversing the sheet after recording and transporting it again to the recording means. 1
3), a switching unit (switching plate 14) for guiding the sheet to the reversing conveyance unit, and a detection unit (registration sensor 10) for detecting the leading edge and the trailing edge of the sheet between the conveyance unit and the switching unit. Is included.
【００１４】画像を記録する記録手段に対して用紙３を
副走査方向へ搬送するために、駆動ローラ５および従動
ローラ６との間に用紙３を吸着して搬送する吸着ベルト
７を張装して配設し、この間にキャリッジ８を設けて主
走査方向印字を可能としている。ここで、吸着ベルト７
の方式は、静電吸引、エア吸引方式や粘着吸引方式等で
も同様な効果が得られるが、本発明の説明では電荷が一
定値以上に残留する高分子ベルトに帯電ローラから電荷
を与える方式を使った場合について説明する。In order to convey the sheet 3 in the sub-scanning direction with respect to the recording means for recording an image, a suction belt 7 is attached between the driving roller 5 and the driven roller 6 to convey the sheet 3 by suction. The carriage 8 is provided between them to enable printing in the main scanning direction. Here, the suction belt 7
The same effect can be obtained by the electrostatic suction, the air suction method, the adhesive suction method, etc., but in the description of the present invention, the method of applying the charge from the charging roller to the polymer belt in which the charge remains above a certain value is used. The case where it is used is explained.
【００１５】この静電方式をとる場合、吸着ベルト７
は、２層構造からなり、用紙３や帯電ローラ１５と接触
する側は絶縁層２２で形成され、接触しない側は伝導層
２１で形成されている（図１０参照）。帯電ローラ１５
は、例えば、吸着ベルト７が搬送速度２００ｍｍ／ｓｅ
ｃ時の速度で回転を開始したとき、±２〜３ＫＶの電
圧、且つ、８〜１０（Ｈｚ）の周波数で＋と−を交互に
印可（実験による適正値）し、少なくとも１回転以上回
転したときに、印可を停止するＡＣバイアス供給部２０
に接続されている。搬送速度が上記例とは異なる場合に
は、その速度に適した印可電圧、周波数を設定すること
により、同様の効果が得られる。When this electrostatic system is adopted, the suction belt 7
Has a two-layer structure. The side that contacts the paper 3 and the charging roller 15 is formed of the insulating layer 22, and the side that does not contact the conductive layer 21 (see FIG. 10). Charging roller 15
Is, for example, when the suction belt 7 has a conveying speed of 200 mm / se.
When the rotation was started at the speed of c hour, + and − were alternately applied at the voltage of ± 2 to 3 KV and the frequency of 8 to 10 (Hz) (the appropriate value by the experiment), and at least one rotation was performed. Sometimes, AC bias supply unit 20 that stops applying
It is connected to the. When the transport speed is different from the above example, the same effect can be obtained by setting the applied voltage and frequency suitable for the speed.
【００１６】搬送開始の指示が出されると、駆動モータ
（図示せず）で駆動ローラ５を回転させて吸着ベルト７
を回転させ、同時にＡＣバイアス供給部２０から帯電ロ
ーラ１５に上述の印加電圧、周波数のＡＣバイアスを加
える。この帯電ローラ１５に加えられるＡＣバイアスに
より吸着ベルト７の絶縁層２２が正と負の電荷２３を吸
着ベルト７の搬送方向に対して交互に帯電する（図１１
参照）。この吸着ベルト７に用紙３が接触すると、吸着
ベルト７の絶縁層２２に帯電した正の電荷から負の電荷
に導かれる磁界２４による静電気により吸着ベルト７に
用紙３が吸着する。When an instruction to start conveyance is issued, a drive motor (not shown) rotates the drive roller 5 to move the suction belt 7.
Is rotated, and at the same time, the AC bias having the above-mentioned applied voltage and frequency is applied to the charging roller 15 from the AC bias supply unit 20. The AC bias applied to the charging roller 15 causes the insulating layer 22 of the suction belt 7 to alternately charge positive and negative charges 23 in the conveyance direction of the suction belt 7 (FIG. 11).
reference). When the sheet 3 comes into contact with the suction belt 7, the sheet 3 is attracted to the suction belt 7 by the static electricity due to the magnetic field 24 that is introduced from the positive charge charged in the insulating layer 22 of the suction belt 7 to the negative charge.
【００１７】しかし、レジストセンサ１０と記録手段
（インクジェットヘッド）間の距離が吸着ベルト７の１
回転よりも大きい場合には、この印可動作を取らなくて
もよい。また、吸着方式が静電方式以外の場合にも上記
印可動作を実施しなくてもよい構成をとることができ
る。However, the distance between the registration sensor 10 and the recording means (inkjet head) is 1 of the suction belt 7.
If it is larger than the rotation, this applying operation may not be performed. Further, even when the suction method is other than the electrostatic method, it is possible to adopt a configuration in which the applying operation need not be performed.
【００１８】また、この吸着ベルト７は、この吸着ベル
ト７を正方向に駆動して表面に印字が終了した後、両面
印字を行うときに、駆動ローラ５、従動ローラ６を逆転
して駆動し、レジストセンサ１０が反転された用紙３の
先端が検知されたときに、正方向に駆動することができ
る。Further, the suction belt 7 drives the suction belt 7 in the forward direction to finish the printing on the front surface thereof, and thereafter, when the double-sided printing is performed, the driving roller 5 and the driven roller 6 are reversely driven. The registration sensor 10 can be driven in the forward direction when the leading edge of the inverted sheet 3 is detected.
【００１９】用紙３を給紙カセットから吸着ベルト７上
に給紙するために、用紙３を１枚ずつ分離して給送する
給紙ローラ２と分離パッド４と、給送される用紙３を搬
送ローラ１に当接させて配設した先端コロ１１まで案内
するガイド板１８を設けている。また、搬送ローラ１と
先端コロ１１のニップの配置位置は、用紙３の先端が吸
着ベルト７の搬送部分の平面より下方に来るように配置
する。用紙３が搬送ローラ１と先端コロ１１のニップに
搬送され、レジストセンサ１０で用紙３の先端を検知す
ると、吸着ベルト７が正方向に駆動し始める。In order to feed the paper 3 from the paper feed cassette onto the suction belt 7, the paper feed roller 2 and the separation pad 4 for separating and feeding the paper 3 one by one, and the paper 3 to be fed. A guide plate 18 that guides the leading end roller 11 that is disposed in contact with the transport roller 1 is provided. Further, the arrangement position of the nip between the conveyance roller 1 and the tip roller 11 is so arranged that the tip of the paper 3 is below the plane of the conveyance portion of the suction belt 7. The sheet 3 is conveyed to the nip between the conveying roller 1 and the leading end roller 11, and when the leading edge of the sheet 3 is detected by the registration sensor 10, the suction belt 7 starts to be driven in the forward direction.
【００２０】用紙３を吸着ベルト７から反転搬送手段へ
搬送するために、吸着ベルト７と反転ローラ１２および
加圧コロ１３との間に搬送ローラ１と先端コロ１１を配
設する。さらに、搬送ローラ１と反転ローラ１２との間
には切り替え板１４を配設して、吸着ベルト７から逆転
されてきた用紙３を反転ローラ１２へガイドする。ま
た、この反転ローラ１２から反転された用紙３を再度搬
送ローラ１まで案内するガイド板１９を設けている。こ
の切り替え板１４は、用紙３が搬送ローラ１へ供給され
るときには、この用紙のコシで持ち上げられるようにな
っており、用紙３が通過後は自重で待機位置へ戻るよう
になっている。印字が終了（片面または両面）したと
き、排紙方向に用紙３を排紙する。In order to convey the sheet 3 from the suction belt 7 to the reversing conveyance means, the conveyance roller 1 and the leading end roller 11 are arranged between the suction belt 7, the reversing roller 12 and the pressure roller 13. Further, a switching plate 14 is arranged between the transport roller 1 and the reversing roller 12 to guide the sheet 3 reversed from the suction belt 7 to the reversing roller 12. Further, a guide plate 19 for guiding the reversed sheet 3 from the reversing roller 12 to the conveying roller 1 again is provided. The switching plate 14 is adapted to be lifted by the rigidity of the sheet 3 when the sheet 3 is supplied to the transport roller 1, and is returned to the standby position by its own weight after the sheet 3 passes. When the printing is completed (one side or both sides), the paper 3 is discharged in the paper discharge direction.
【００２１】（１）表面への記録
本発明のインクジェット記録装置を用いて用紙の表面へ
記録するときの動作について説明する。用紙トレイの用
紙３は、給紙ローラ２と分離パッド４により一枚に分離
され、ガイド板１８を通り、切り替え板１４を用紙３の
コシにより持ち上げ（図３の１４ａの状態）、搬送ロー
ラ１と先端コロ１１のニップに搬送され、レジストセン
サ１０で用紙３の先端を検知し、吸着ベルト７を駆動さ
せる（図３の用紙３が３ａにある状態）。吸着ベルト７
を駆動させると同時に、ＡＣバイアス供給部２０からＡ
Ｃバイアスを加えて、帯電ローラ１５から吸着ベルト７
に帯電させる。(1) Recording on the Surface The operation when recording on the surface of a sheet using the ink jet recording apparatus of the present invention will be described. The sheet 3 in the sheet tray is separated into one sheet by the sheet feeding roller 2 and the separation pad 4, passes through the guide plate 18, and the switching plate 14 is lifted by the rigidity of the sheet 3 (state 14a in FIG. 3). Then, the registration sensor 10 detects the front end of the sheet 3 and drives the suction belt 7 (the state in which the sheet 3 is at 3a in FIG. 3). Adsorption belt 7
At the same time as driving the
Applying a C bias, the charging belt 15 to the suction belt 7
To charge.
【００２２】さらに用紙３が搬送されると、電圧を印加
したときの静電気の吸着力により用紙３を密着した吸着
ベルト７で搬送され、記録手段で印字される（図４の用
紙３が３ｂにある状態）。ここで、用紙３が吸着ベルト
７に密着していない場合には、その箇所からエアが入り
込み吸着力が劣り、印字時に吸着不足によるコックリン
グなどが発生しやすくなる（図５の用紙３が３ｃのよう
にベルトに密着していない状態）。When the sheet 3 is further conveyed, the sheet 3 is conveyed by the adsorption belt 7 which is in close contact with the sheet due to the electrostatic adsorption force when a voltage is applied, and is printed by the recording means (the sheet 3 in FIG. There is). Here, when the paper 3 is not in close contact with the suction belt 7, air enters from that portion and the suction force is poor, and cockling due to insufficient suction is likely to occur during printing (paper 3c in FIG. (State not in close contact with the belt like).
【００２３】印字が終了したとき、用紙３の後端がレジ
ストセンサ１０を通過していない場合は、レジストセン
サ１０が用紙３の後端が通過するまで用紙３を排紙方向
に搬送し、搬送ローラ１と先端コロ１１のニップから外
れるまで搬送する。また、すでに用紙３の後端がレジス
トセンサ１０を通過していた場合には、上記の動作はし
なくてもよい（図６の用紙３が３ｄにある状態）。用紙
３が切り替え板１４を通過すると、切り替え板１４は自
重で待機位置まで回転する（図７の１４の状態）。片面
印字が指示されている場合には、印字が終了すると、用
紙３を排紙して終了する（図７の用紙３が３ｅにある状
態）。When the trailing edge of the sheet 3 has not passed the registration sensor 10 when printing is completed, the sheet sensor 3 conveys the sheet 3 in the sheet discharge direction until the trailing edge of the sheet 3 passes, and the sheet is conveyed. The sheet is conveyed until it comes out of the nip between the roller 1 and the tip roller 11. If the trailing edge of the sheet 3 has already passed the registration sensor 10, the above operation may not be performed (the state in which the sheet 3 in FIG. 6 is 3d). When the sheet 3 passes through the switching plate 14, the switching plate 14 rotates to its standby position by its own weight (state 14 in FIG. 7). When single-sided printing is instructed, when the printing is completed, the paper 3 is ejected and the operation is completed (the paper 3 in FIG. 7 is in 3e).
【００２４】（２）裏面への記録
次に、両面印字を指示されていた場合には、続いて、吸
着ベルト７と搬送ローラ１を逆転駆動させ、用紙３を反
転搬送手段へ搬送する（図８の用紙が３ｆにある状
態）。このとき切り替え板１４は、自重で待機位置にあ
り、用紙３の後端は切り替え板１４上面を通り、反転搬
送手段の反転ローラ１２を通って反転され、更に搬送さ
れると切り替え板１４を持ち上げる。この時点で用紙３
は反転した状態で裏面が記録される状態になっている。(2) Recording on the Back Side Next, when double-sided printing is instructed, the suction belt 7 and the conveying roller 1 are driven in reverse, and the sheet 3 is conveyed to the reverse conveying means (FIG. 8 sheet is on 3f). At this time, the switching plate 14 is in the standby position by its own weight, the rear end of the sheet 3 passes through the upper surface of the switching plate 14 and is reversed by the reversing roller 12 of the reversing / conveying means, and when further conveyed, the switching plate 14 is lifted. . Paper 3 at this point
Is the state in which the reverse side is recorded in the inverted state.
【００２５】続いて、用紙３が搬送ローラ１と先端コロ
１１のニップに達し、レジストセンサ１０によって裏面
の先端を検知すると、吸着ベルト７が作動して、裏面へ
の記録動作が開始される（図９の用紙３が３ｇにある状
態）。以降の動作は、表面の記録動作と同じであるが、
裏面の印字が終了した場合には排紙方向に用紙３を排紙
して記録動作を終了する。Subsequently, when the sheet 3 reaches the nip between the conveying roller 1 and the leading end roller 11, and the registration sensor 10 detects the leading end of the back surface, the suction belt 7 operates and the recording operation on the back surface is started ( The state in which the paper 3 in FIG. 9 is 3 g). The subsequent operation is the same as the recording operation on the surface,
When the printing on the back side is completed, the paper 3 is ejected in the paper ejection direction and the recording operation is completed.
【００２６】（３）用紙が薄い場合の動作
薄手の用紙を利用して両面印字する場合、吸着ベルト７
で強い吸着力を与えてしまうと、用紙３が吸着ベルト７
に吸着されたまま巻き付いてしまい、反転搬送手段へ搬
送されない危険性が出てきてしまう。そこで、吸着ベル
ト７を逆転駆動するときに、用紙３の先端が吸着ベルト
７から分離しやすいように、その先端での吸着力を弱め
るようにする。(3) Operation when paper is thin When using double-sided printing using thin paper, the suction belt 7
If a strong suction force is given by the
There is a risk that it will not be conveyed to the reversal conveying means because it will be wrapped around as it is adsorbed on the sheet. Therefore, when the suction belt 7 is driven in the reverse direction, the suction force at the tip is weakened so that the tip of the paper 3 is easily separated from the suction belt 7.
【００２７】用紙３のサイズは、予め記録装置に設定
（記憶）されているか、または、サイズ検知手段によっ
て認識されており、用紙３の先端から所定の位置（例え
ば、１ｍｍ以上）のところまで、吸着ベルト７の吸着力
を通常吸着力より弱くするか、またはゼロにする。例え
ば、Ａ４（副走査方向町２９７ｍｍ）サイズで用紙３の
場合には、先端から３ｍｍの位置までは吸着力を与え
ず、用紙３の先端３ｍｍ以降から２９７ｍｍに通常の吸
着力を与えるようにする。この吸着力を与えるＡＣバイ
アスは、上述のように吸着ベルト７の搬送速度２００ｍ
ｍ／ｓｅｃ時で、±２〜３ＫＶの電圧、且つ、８〜１０
Ｈｚの周波数を＋と−とが交互となるように印加するこ
とにより得られ、この条件から外れた値の印可を実施す
ることにより、吸着ベルト７の吸着力を減少あるいはゼ
ロにする。このように、吸着ベルト７と用紙３の先端と
は、通常の吸着力よりも弱い、またはゼロとしたので、
用紙３の先端は駆動ローラ５のＲ曲率で吸着ベルト７か
ら十分に分離し、搬送ローラ１に用紙３を搬送すること
ができる。The size of the paper 3 is set (stored) in the recording device in advance or is recognized by the size detecting means, and from the leading end of the paper 3 to a predetermined position (for example, 1 mm or more), The suction force of the suction belt 7 is made weaker than the normal suction force or is made zero. For example, in the case of the sheet 3 of A4 size (297 mm in the sub-scanning direction), the suction force is not given to the position 3 mm from the leading edge, and the normal suction force is given to 297 mm from the tip 3 mm or later of the sheet 3. . As described above, the AC bias that gives the suction force is 200 m at the conveyance speed of the suction belt 7.
Voltage of ± 2 to 3 KV and 8 to 10 at m / sec
It is obtained by applying the frequency of Hz such that + and − alternate, and by applying a value outside this condition, the suction force of the suction belt 7 is reduced or made zero. In this way, the suction belt 7 and the leading edge of the paper 3 are weaker than the normal suction force, or are set to zero,
The leading edge of the sheet 3 is sufficiently separated from the suction belt 7 by the R curvature of the driving roller 5, and the sheet 3 can be conveyed to the conveying roller 1.
【００２８】この吸着力を与えない位置は、搬送ローラ
１、吸着ベルト７、駆動ローラ５、これらのローラ類に
連結されているギヤ、モータ軸に取り付けられたエンコ
ーダ１７の情報、または、パルスモータの場合は、パル
スカウントにより検出することができる。The positions where the suction force is not applied are the conveyance roller 1, the suction belt 7, the driving roller 5, the gears connected to these rollers, the information of the encoder 17 attached to the motor shaft, or the pulse motor. In the case of, it can be detected by pulse counting.
【００２９】上述した実施の形態における用紙反転部分
の反転ローラ１２、加圧コロ１３、ガイド板１９および
切り替え板１４とをユニット化するように構成してもよ
い。この用紙反転部分をユニット化した場合に、このユ
ニットが無い場合（オプションとした場合）でもインク
ジェット記録装置としての構成がとれ、用紙排出部（用
紙スタッカ）のレイアウト位置もユニットの有無に関わ
らず同一構成を取ることができる。The reversing roller 12, the pressure roller 13, the guide plate 19 and the switching plate 14 in the paper reversing portion in the above-described embodiment may be unitized. When this paper reversal unit is unitized, the inkjet recording device can be configured even if this unit is not provided (optional), and the layout position of the paper discharge unit (paper stacker) is the same regardless of the presence or absence of the unit. Can take a configuration.
【００３０】また、上述した実施の形態では、給紙ロー
ラ２と駆動ローラ５間に搬送ローラ１を設けているが、
上記（３）の場合には、搬送ローラ１と切り替え板１４
がない場合であっても同様の効果を得ることができる。Further, in the above-mentioned embodiment, the transport roller 1 is provided between the paper feed roller 2 and the drive roller 5, but
In the case of (3) above, the transport roller 1 and the switching plate 14
The same effect can be obtained even in the absence of the above.
【００３１】[0031]
【発明の効果】以上説明したように本発明によれば、搬
送手段に吸着ベルトを採用したことにより、両面印字実
施時でも用紙の後端の余白を無くすことが可能となっ
た。また、搬送路も極端に長くなく、簡略化された構成
であり、低コスト、両面印字の生産性も相対的に向上さ
せることが可能となった。また、用紙を吸着ベルトに密
着させるので、搬送信頼性、コックリングの発生の低減
効果が得られた。用紙裏面への記録の際、用紙の先端の
吸着力を通常よりも弱くしているので吸着ベルトからの
分離性が向上し、薄紙などの腰の弱い用紙でも両面印字
が可能となった。As described above, according to the present invention, the use of the suction belt as the conveying means makes it possible to eliminate the blank space at the trailing edge of the paper even when performing double-sided printing. In addition, the transport path is not extremely long and has a simplified structure, which makes it possible to relatively improve the productivity of double-sided printing at low cost. Further, since the sheet is brought into close contact with the suction belt, the effects of transport reliability and reduction of cockling are obtained. When recording on the back side of the paper, the suction force at the tip of the paper is weaker than usual, improving the separability from the suction belt and enabling double-sided printing even on weak paper such as thin paper.
【図面の簡単な説明】[Brief description of drawings]
【図１】 本発明のインクジェット記録装置の用紙搬送
および記録部分の概略構成図を上から見た平面図であ
る。FIG. 1 is a plan view of a schematic configuration of a sheet conveying and recording portion of an inkjet recording apparatus according to the present invention, as viewed from above.
【図２】 図１の概略構成図を横から見た断面図であ
る。FIG. 2 is a cross-sectional view of the schematic configuration diagram of FIG. 1 viewed from the side.
【図３】 用紙が搬送ローラへ搬送される状態を説明す
るための図である。FIG. 3 is a diagram for explaining a state in which a sheet is conveyed to a conveying roller.
【図４】 用紙が吸着ベルトへ搬送される状態を説明す
るための図である。FIG. 4 is a diagram for explaining a state in which a sheet is conveyed to a suction belt.
【図５】 用紙が吸着ベルトへ密着しないで搬送される
状態を説明するための図である。FIG. 5 is a diagram for explaining a state in which a sheet is conveyed without being brought into close contact with a suction belt.
【図６】 用紙の後端がレジストセンサを通過している
状態を説明するための図である。FIG. 6 is a diagram for explaining a state in which the trailing edge of the sheet has passed a registration sensor.
【図７】 用紙が切り替え板を通過した後の切り替え板
の状態を説明するための図である。FIG. 7 is a diagram for explaining a state of the switching plate after the sheet has passed through the switching plate.
【図８】 用紙が反転搬送手段へ搬送されたときの状態
を説明するための図である。FIG. 8 is a diagram for explaining a state when a sheet is conveyed to a reversal conveying unit.
【図９】 反転した用紙が再度吸着ベルトへ搬送される
状態を説明するための図である。FIG. 9 is a diagram for explaining a state in which the reversed sheet is conveyed to the suction belt again.
【図１０】 吸着ベルトの帯電状況を説明する図であ
る。FIG. 10 is a diagram illustrating a charging state of the suction belt.
【図１１】 吸着ベルトへ用紙が吸着することを説明す
る図である。FIG. 11 is a diagram illustrating that the paper is adsorbed to the adsorption belt.
１…搬送ローラ、２…給紙ローラ、３…用紙、４…分離
パッド、５…駆動ローラ、６…従動ローラ、７…吸着ベ
ルト、８…キャリッジ、９…押工板、１０…レジストセ
ンサ、１１…先端コロ、１２…反転ローラ、１３…加圧
ローラ、１４…切り替え板、１５…帯電ローラ、１６…
スプリング、１７…エンコーダ、１８…ガイド版、１９
…ガイド板、２０…ＡＣバイアス供給部、２１…導電
層、２２…絶縁層、２３…電荷、２４…磁界。DESCRIPTION OF SYMBOLS 1 ... Conveying roller, 2 ... Paper feeding roller, 3 ... Paper, 4 ... Separation pad, 5 ... Driving roller, 6 ... Followed roller, 7 ... Adsorption belt, 8 ... Carriage, 9 ... Press plate, 10 ... Registration sensor, 11 ... Tip roller, 12 ... Inversion roller, 13 ... Pressure roller, 14 ... Switching plate, 15 ... Charging roller, 16 ...
Spring, 17 ... Encoder, 18 ... Guide plate, 19
... guide plate, 20 ... AC bias supply section, 21 ... conductive layer, 22 ... insulating layer, 23 ... charge, 24 ... magnetic field.
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2C056 EA04 EA24 EB13 EB36 EC12 EC34 HA29 2C059 AA05 AA22 AA26 AA55 AA67 AA72 3F053 EA05 EB01 EC02 LA07 LB03 3F102 AA11 AB01 BA11 BB02 CA05 CB01 EA03 EC03 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 2C056 EA04 EA24 EB13 EB36 EC12 EC34 HA29 2C059 AA05 AA22 AA26 AA55 AA67 AA72 3F053 EA05 EB01 EC02 LA07 LB03 3F102 AA11 AB01 BA11 BB02 CA05 CB01 EA03 EC03
Claims (5)
出させて用紙上に画像を記録する記録手段と、前記用紙
を吸着させて前記記録手段に搬送するための正逆方向に
駆動可能な搬送手段と、記録後の用紙を反転させて再度
前記記録手段に搬送する反転搬送手段とからなるインク
ジェット記録装置において、前記搬送手段を正方向に駆
動して前記記録手段で前記用紙に記録した後、前記搬送
手段を逆方向へ駆動し、前記反転搬送手段へ前記用紙を
搬送することによって用紙の両面に記録することを特徴
とするインクジェット記録装置。1. A recording unit for ejecting ink droplets from an inkjet head to record an image on a sheet, and a conveying unit for adsorbing the sheet and conveying the sheet to the recording unit, which can be driven in forward and reverse directions. In an ink jet recording apparatus, which comprises a reversal conveying means for reversing a recording sheet and conveying it again to the recording means, the conveying means is driven in the forward direction to record on the sheet by the recording means, and then the conveying means. An inkjet recording apparatus for recording on both sides of a sheet by driving the sheet in the reverse direction and conveying the sheet to the reverse conveying unit.
置において、前記用紙を前記反転搬送手段に導くための
切り替え手段を設け、前記切り替え手段は、前記用紙の
表面に記録するときにはこの用紙によって押し上げられ
て搬送路を確保し、前記用紙の裏面に記録するときには
自重によって前記用紙の搬送路を切り替えて前記反転搬
送手段へ搬送するようにしたことを特徴とするインクジ
ェット記録装置。2. The ink jet recording apparatus according to claim 1, further comprising a switching means for guiding the paper to the reversing / conveying means, the switching means being pushed up by the paper when recording on the surface of the paper. An ink jet recording apparatus is characterized in that a conveyance path is secured by means of the weight, and when recording on the back surface of the paper, the conveyance path of the paper is switched by its own weight and the paper is conveyed to the reversing conveyance means.
ト記録装置において、前記搬送手段と前記切り替え手段
との間に前記用紙の先端および後端を検知するための検
知手段を設け、前記検知手段で前記用紙の後端が検知さ
れるまで前記搬送手段を正方向に駆動して前記記録手段
で前記用紙に記録した後、前記検知手段で前記用紙の後
端が検知されると、前記搬送手段を逆方向へ駆動し、前
記切り替え手段を介して前記反転搬送手段へ前記用紙を
搬送することを特徴とするインクジェット記録装置。3. The ink jet recording apparatus according to claim 1, further comprising a detection unit for detecting a leading edge and a trailing edge of the sheet between the conveying unit and the switching unit, and the detecting unit. After the conveyance means is driven in the forward direction until the trailing edge of the paper is detected and the recording means records on the paper, when the trailing edge of the paper is detected by the detection means, the conveyance means is moved. An ink jet recording apparatus, which is driven in the reverse direction and conveys the sheet to the reversal conveying means via the switching means.
置において、前記搬送手段の搬送面よりも前記用紙の先
端が下方となるように前記検知手段を配置したことを特
徴とするインクジェット記録装置。4. The ink jet recording apparatus according to claim 3, wherein the detecting unit is arranged such that the leading end of the sheet is below the conveying surface of the conveying unit.
ンクジェット記録装置において、前記搬送手段は、前記
用紙の後端の少なくとも１ｍｍ以上の範囲で吸着力を通
常よりも少なく、あるいはなくすことを特徴とするイン
クジェット記録装置。5. The ink jet recording apparatus according to claim 1, wherein the conveying unit has a suction force less than or equal to a normal suction force in a range of at least 1 mm at the trailing edge of the sheet. An inkjet recording device characterized by the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001359696A JP3847149B2 (en) | 2001-11-26 | 2001-11-26 | Inkjet recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001359696A JP3847149B2 (en) | 2001-11-26 | 2001-11-26 | Inkjet recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003154643A true JP2003154643A (en) | 2003-05-27 |
| JP3847149B2 JP3847149B2 (en) | 2006-11-15 |
Family
ID=19170653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001359696A Expired - Fee Related JP3847149B2 (en) | 2001-11-26 | 2001-11-26 | Inkjet recording device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3847149B2 (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2412352A (en) * | 2004-03-23 | 2005-09-28 | Hewlett Packard Development Co | A duplex system for an inkjet printer |
| JP2007038562A (en) * | 2005-08-04 | 2007-02-15 | Brother Ind Ltd | Inkjet recording device |
| US7344238B2 (en) | 2004-09-07 | 2008-03-18 | Fuji Xerox Co., Ltd. | Inkjet recording device |
| US7549723B2 (en) | 2005-02-04 | 2009-06-23 | Fuji Xerox Co., Ltd. | Recording apparatus |
| JP2009234676A (en) * | 2008-03-26 | 2009-10-15 | Seiko Epson Corp | Medium carrying device and recording device |
| US20100060693A1 (en) * | 2008-09-11 | 2010-03-11 | Brother Kogyo Kabushiki Kaisha | Printer |
| JP2010274580A (en) * | 2009-05-29 | 2010-12-09 | Seiko Epson Corp | Recording medium transporting apparatus, and recorder |
| JP2011011552A (en) * | 2010-08-11 | 2011-01-20 | Seiko Epson Corp | Recording medium guiding device, recording device, and liquid jetting device |
| JP2013230912A (en) * | 2012-04-27 | 2013-11-14 | Ricoh Co Ltd | Image forming apparatus |
| JP2013241278A (en) * | 2013-07-29 | 2013-12-05 | Seiko Epson Corp | Device for carrying medium to be recorded, and recording device |
| JP2015027784A (en) * | 2013-07-04 | 2015-02-12 | セイコーエプソン株式会社 | Printer and control method thereof |
| US9174465B2 (en) | 2014-03-03 | 2015-11-03 | Seiko Epson Corporation | Printer |
| CN107521228A (en) * | 2016-06-17 | 2017-12-29 | 精工爱普生株式会社 | Tape deck |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7784783B2 (en) | 2004-03-23 | 2010-08-31 | Hewlett-Packard Development Company, L.P. | Duplex system for an inkjet printer |
| GB2412352A (en) * | 2004-03-23 | 2005-09-28 | Hewlett Packard Development Co | A duplex system for an inkjet printer |
| US7344238B2 (en) | 2004-09-07 | 2008-03-18 | Fuji Xerox Co., Ltd. | Inkjet recording device |
| US7549723B2 (en) | 2005-02-04 | 2009-06-23 | Fuji Xerox Co., Ltd. | Recording apparatus |
| JP2007038562A (en) * | 2005-08-04 | 2007-02-15 | Brother Ind Ltd | Inkjet recording device |
| JP4735112B2 (en) * | 2005-08-04 | 2011-07-27 | ブラザー工業株式会社 | Inkjet recording device |
| JP2009234676A (en) * | 2008-03-26 | 2009-10-15 | Seiko Epson Corp | Medium carrying device and recording device |
| US9162505B2 (en) * | 2008-09-11 | 2015-10-20 | Brother Kogyo Kabushiki Kaisha | Printer |
| US20100060693A1 (en) * | 2008-09-11 | 2010-03-11 | Brother Kogyo Kabushiki Kaisha | Printer |
| JP2010274580A (en) * | 2009-05-29 | 2010-12-09 | Seiko Epson Corp | Recording medium transporting apparatus, and recorder |
| JP2011011552A (en) * | 2010-08-11 | 2011-01-20 | Seiko Epson Corp | Recording medium guiding device, recording device, and liquid jetting device |
| JP2013230912A (en) * | 2012-04-27 | 2013-11-14 | Ricoh Co Ltd | Image forming apparatus |
| JP2015027784A (en) * | 2013-07-04 | 2015-02-12 | セイコーエプソン株式会社 | Printer and control method thereof |
| JP2013241278A (en) * | 2013-07-29 | 2013-12-05 | Seiko Epson Corp | Device for carrying medium to be recorded, and recording device |
| US9174465B2 (en) | 2014-03-03 | 2015-11-03 | Seiko Epson Corporation | Printer |
| CN107521228A (en) * | 2016-06-17 | 2017-12-29 | 精工爱普生株式会社 | Tape deck |
| CN107521228B (en) * | 2016-06-17 | 2019-11-01 | 精工爱普生株式会社 | Recording device |
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