JP5359673B2 - Image forming apparatus and image forming system - Google Patents
Image forming apparatus and image forming system Download PDFInfo
- Publication number
- JP5359673B2 JP5359673B2 JP2009186428A JP2009186428A JP5359673B2 JP 5359673 B2 JP5359673 B2 JP 5359673B2 JP 2009186428 A JP2009186428 A JP 2009186428A JP 2009186428 A JP2009186428 A JP 2009186428A JP 5359673 B2 JP5359673 B2 JP 5359673B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- toner
- bias current
- transport
- image forming
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Or Security For Electrophotography (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
Abstract
Description
本発明は、高速印刷を行う画像形成装置及び画像形成システムに関する。 The present invention relates to an image forming apparatus and an image forming system that perform high-speed printing.
電子写真方式などを用いて像担持体にトナー像を現像し、トナー像を記録媒体に転写手段により転写し、未定着のトナー像を熱定着手段により記録媒体に定着する画像形成装置が知られており、使用されている。 An image forming apparatus that develops a toner image on an image carrier using an electrophotographic method, transfers the toner image to a recording medium by a transfer unit, and fixes an unfixed toner image on the recording medium by a thermal fixing unit is known. And used.
最近の画像形成装置では、市場の要求により画像形成の高精細化や高速化が進んでいる。このため、高速で画像形成を行う画像形成装置では、画像の形成の質だけでなく、用紙などの転写媒体を安定して搬送する搬送手段も重要でなる。 In recent image forming apparatuses, high-definition and high-speed image formation are progressing according to market demand. For this reason, in an image forming apparatus that forms an image at high speed, not only the quality of image formation but also a transport unit that stably transports a transfer medium such as paper is important.
高速で画像形成を行う画像形成装置においては、起動、停止といった急激な動作が起こり得るため、印刷中の記録媒体の搬送手段とともに、この急激な動作に対する機械制御も重要である。 In an image forming apparatus that performs image formation at a high speed, abrupt operations such as starting and stopping can occur, and therefore, mechanical control for this rapid operation is important as well as a conveying means for a recording medium during printing.
例えば、特許文献１（特開２００７−４７１９５号公報）では、転写アシストローラとガイド部材を設けて、記録媒体のシワ等を防ぐ方法が開示されている。 For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2007-47195) discloses a method of preventing a wrinkle of a recording medium by providing a transfer assist roller and a guide member.
しかしながら、この方法では、用紙の搬送時に起きる、転写点の近傍における用紙の変動については対応が難しい。この方法では、特に、印刷終了後の用紙の搬送停止後には、急停止した際に用紙がたるむ、あるいは異常に引っ張られる、というようなことが起こるため、転写点の近傍で用紙が像担持体から離れる角度が変わり、転写点では像担持体上に付着した残存トナーに近づき、もしくは接触してしまい、用紙が汚れてしまうという問題が残る。 However, with this method, it is difficult to cope with the fluctuation of the sheet near the transfer point that occurs during the conveyance of the sheet. In this method, particularly, after the conveyance of the paper after the printing is stopped, the paper is slackened or abnormally pulled when the paper stops suddenly. The angle away from the toner changes, and the transfer point approaches or comes in contact with the residual toner adhering to the image carrier, and the paper remains dirty.
そこで本発明は、上記問題点に鑑みてなされたもので、高速印刷を行う際に搬送開始直後、停搬送停止直後に受ける衝撃や惰性によるトナー汚れを防ぐ画像形成装置及び画像形成システムを提供することを目的とする。 Accordingly, the present invention has been made in view of the above problems, and provides an image forming apparatus and an image forming system that prevent toner stains due to impact and inertia that are received immediately after the start of conveyance and immediately after stop of conveyance during high-speed printing. For the purpose.
上記課題を解決するため、本発明における画像形成装置は、用紙を搬送する搬送手段と、表面にトナーによる像を形成する像担持体と、前記像担持体に対向する位置に配置され、前記搬送手段により搬送される用紙に前記トナーと逆極性のバイアス電流を印加する転写器と、を有し、前記用紙は連続紙であり、前記転写器は、前記搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間は、前記トナーと同極性のバイアス電流を、前記搬送手段により搬送される用紙に印加することを特徴とする。 In order to solve the above problems, an image forming apparatus according to the present invention is disposed at a position opposite to the image carrier, a conveyance unit that conveys a sheet, an image carrier that forms an image of toner on a surface thereof, and the conveyance A transfer device that applies a bias current having a polarity opposite to that of the toner to the paper transported by the means, the paper is a continuous paper, and the transfer device before the paper transport by the transport means is stopped . A bias current having the same polarity as that of the toner is applied to the paper transported by the transporting unit for a first predetermined time from the time point to the time after the paper transport is stopped .
また、本発明における画像形成システムは、第１の画像形成装置と第２の画像形成装置とを有して構成する画像形成システムであって、前記第１の画像形成装置は、用紙を搬送する第１の搬送手段と、表面にトナーによる像を形成する第１の像担持体と、前記第１の像担持体に対向する位置に配置され、前記第１の搬送手段により搬送される用紙に前記トナーと逆極性のバイアス電流を印加する第１の転写器と、を有し、前記第２の画像形成装置は、前記用紙を搬送する第２の搬送手段と、表面にトナーによる像を形成する第２の像担持体と、前記第２の像担持体に対向する位置に配置され、前記第２の搬送手段により搬送される用紙に前記トナーと逆極性のバイアス電流を印加する第２の転写器と、を有し、前記用紙は連続紙であり、前記第１の転写器は、前記第１の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間は、前記トナーと同極性のバイアス電流を、前記第１の搬送手段により搬送される用紙に印加し、前記第２の転写器は、前記第２の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第２の所定時間の間は、前記トナーと同極性のバイアス電流を、前記第２の搬送手段により搬送される用紙に印加することを特徴とする。 According to another aspect of the present invention, there is provided an image forming system including a first image forming apparatus and a second image forming apparatus, wherein the first image forming apparatus conveys paper. A first conveying unit; a first image carrier that forms an image of toner on a surface; and a sheet that is disposed at a position facing the first image carrier and is conveyed by the first conveying unit. A first transfer device that applies a bias current having a polarity opposite to that of the toner, and the second image forming apparatus forms a second image on the surface with a second conveying unit that conveys the paper. And a second image carrier that is disposed at a position opposite to the second image carrier and applies a bias current having a polarity opposite to that of the toner to a sheet conveyed by the second conveying unit. A transfer device, wherein the paper is a continuous paper, 1 of the transfer unit, said first conveyor means first from point before stopping the conveyance of the sheet at the time after the stopping of the feed of the paper by for a predetermined time, the bias current of the same polarity as toner, The second transfer device applies the second transfer device to a second time after the stop of the transport of the paper from the time before the stop of the transport of the paper by the second transport means. During the predetermined time, a bias current having the same polarity as that of the toner is applied to the paper conveyed by the second conveying means.
本発明により、高速印刷を行う際に搬送開始直後、停搬送停止直後に受ける衝撃や惰性によるトナー汚れを防ぐことができる。 According to the present invention, it is possible to prevent toner stains due to impact and inertia that are received immediately after the start of conveyance and immediately after stoppage of conveyance when performing high-speed printing.
次に、発明を実施するための形態について図面を参照して詳細に説明する。 Next, embodiments for carrying out the invention will be described in detail with reference to the drawings.
図１は、本発明の実施形態に係る画像形成装置の概略断面図である。像担持体である感光体ドラム１は図１の場合、時計回りに回転する。感光体ドラムとして、本発明では、例えば、セレン系の感光体ドラムを使用する。感光体ドラム１の周囲には、作像工程順に帯電器２、露光装置３、現像器４、転写器５、清掃器７が配設されている。転写器５としては、例えば、コロナ転写器が使われる。 FIG. 1 is a schematic sectional view of an image forming apparatus according to an embodiment of the present invention. In the case of FIG. 1, the photosensitive drum 1 as an image carrier rotates clockwise. In the present invention, for example, a selenium photosensitive drum is used as the photosensitive drum. Around the photosensitive drum 1, a charger 2, an exposure device 3, a developing device 4, a transfer device 5, and a cleaning device 7 are arranged in the order of image forming processes. For example, a corona transfer device is used as the transfer device 5.
感光体ドラム１は帯電器２によって表面を一様に帯電される。例えば、帯電器２として、コロトロン帯電器を使用し、感光体ドラム１の表面電位をある範囲の電位にする。本実施例では、500V〜750Vにすると良い。帯電器２としては、スコロトロン帯電器を使用した方がコロトロン帯電器を使用するより感光体ドラム１を均一に帯電させることができる。しかし、スコロトロン帯電器の場合はグリッドを使用するため、このグリッドへ印加するための電源が新たに必要となる。 The surface of the photosensitive drum 1 is uniformly charged by a charger 2. For example, a corotron charger is used as the charger 2, and the surface potential of the photosensitive drum 1 is set to a certain range of potential. In this embodiment, it is good to set it to 500V-750V. As the charger 2, using the scorotron charger can charge the photosensitive drum 1 more uniformly than using the corotron charger. However, in the case of the scorotron charger, a grid is used, so that a power source for applying to the grid is newly required.
続いて、露光装置３によって画像パターンを書き込み、感光体ドラム１の表面上に静電潜像を形成する。静電潜像は現像器４を通過すると、感光体ドラム１の表面上の静電潜像に現像器４の磁気ローラより搬送された帯電したトナーが静電吸着し、トナー像が可視化、つまり、現像される。現像に際してはトナーとキャリアによる２成分の接触帯電を行い、磁気ローラより、例えば、300V〜500Vの現像バイアス電圧を印加し、トナーは正極に帯電されているようにすると良い。 Subsequently, an image pattern is written by the exposure device 3 to form an electrostatic latent image on the surface of the photosensitive drum 1. When the electrostatic latent image passes through the developing device 4, the charged toner conveyed from the magnetic roller of the developing device 4 is electrostatically attracted to the electrostatic latent image on the surface of the photosensitive drum 1, and the toner image is visualized. Developed. At the time of development, two-component contact charging with toner and carrier is performed, and a developing bias voltage of, for example, 300 V to 500 V is applied from a magnetic roller so that the toner is charged to the positive electrode.
転写媒体として使用する用紙６は現像されたトナー像とタイミングを合わせるように、図の下部より移動し、搬送ベルト８の駆動を受けて転写器５へ向かう。用紙６は両側に搬送ベルト８に掛かるような孔が設けられており、定格の大きさのページが連続している連続紙であり、定格の大きさでページを分けるようにミシン目が施され、交互に折り畳まれている。搬送ベルト８にはピンが付いていて用紙６を挟持し、片側のローラが回動して送る。用紙６は用紙の背面にある転写器５から、例えば、−0.4mA〜−1.6mAの電流を印加される。用紙６は感光体ドラム１へ静電的に接触し、感光体ドラム１の表面に現像されたトナー像が用紙６へ転写する（転写工程）。ここで、用紙６の搬送手段としては、上記の搬送ベルト８とガイドによる方法の他にもいろいろと考えられる。本発明に係る画像形成装置の搬送手段としては、用紙６を感光体ドラム１と転写器５との間を安定して搬送できる搬送手段であれば良い。 The sheet 6 used as a transfer medium moves from the lower part of the drawing so as to be synchronized with the developed toner image, and is driven by the transport belt 8 toward the transfer unit 5. The paper 6 is provided with holes on both sides so as to be hooked on the conveyor belt 8 and is a continuous paper in which pages of a rated size are continuous, and is perforated to divide the pages by the rated size. Are folded alternately. A pin is attached to the conveyor belt 8 to pinch the sheet 6 and a roller on one side rotates to send it. For example, a current of −0.4 mA to −1.6 mA is applied to the paper 6 from the transfer device 5 on the back surface of the paper. The sheet 6 is electrostatically brought into contact with the photosensitive drum 1 and the toner image developed on the surface of the photosensitive drum 1 is transferred to the sheet 6 (transfer process). Here, there are various conceivable means for transporting the paper 6 in addition to the method using the transport belt 8 and the guide. The conveying unit of the image forming apparatus according to the present invention may be any conveying unit that can stably convey the sheet 6 between the photosensitive drum 1 and the transfer unit 5.
転写器５は、例えば、ワイヤーとシールドからなるコロトロン帯電器を使用する。転写器５の両側には図示していないが、用紙６を安定に搬送し、感光体ドラム１への接触を補助するためのガイドが設けられている。このガイドにより、用紙６が転写器５から一定の距離を通過することが可能になる。この転写器５とガイドからなる転写装置は、用紙６への転写工程を行わないときは感光体ドラム１から離れており、転写工程時に感光体ドラム１へ近づくような動作を行う。また、転写器５から用紙６に印加するバイアスは定電流制御にすると良い。また、ガイドとアースとの結線の間には1MΩ以上の抵抗があるようにしても良い。 As the transfer device 5, for example, a corotron charger composed of a wire and a shield is used. Although not shown on both sides of the transfer device 5, guides are provided for stably transporting the paper 6 and assisting the contact with the photosensitive drum 1. This guide allows the sheet 6 to pass a certain distance from the transfer unit 5. The transfer device including the transfer device 5 and the guide is separated from the photosensitive drum 1 when the transfer process to the paper 6 is not performed, and operates so as to approach the photosensitive drum 1 during the transfer process. The bias applied to the paper 6 from the transfer device 5 is preferably controlled by constant current. There may be a resistance of 1 MΩ or more between the guide and the ground.
用紙６へ転写しきれずに感光体ドラム１に残ったトナー像は清掃器７で取り除かれる。清浄化された感光体ドラム１は再び帯電器２へ向かう。表面にトナー像が転写された用紙６は搬送ベルト８の駆動を受けて定着器９へ導かれる。なお、搬送ベルト８はいずれも等速で用紙６を搬送している。定着器９は、２本のローラで用紙６を挟むような構成であり、ローラ内部に設けられたヒータより熱を加えて用紙６表面のトナー像を熱圧着する。最後に用紙６を折りたたむことで、一連の動作が完了する。 The toner image remaining on the photosensitive drum 1 without being transferred onto the paper 6 is removed by the cleaner 7. The cleaned photosensitive drum 1 goes to the charger 2 again. The sheet 6 on which the toner image is transferred is guided to the fixing device 9 by driving the conveyance belt 8. Note that the transport belt 8 transports the paper 6 at a constant speed. The fixing device 9 is configured such that the paper 6 is sandwiched between two rollers, and heat is applied from a heater provided in the roller to thermally press the toner image on the surface of the paper 6. Finally, the series of operations is completed by folding the paper 6.
この画像形成装置において、帯電器２としてコロトロン帯電器を使用し、帯電器２により感光体ドラム１の表面電位を500V〜750Vにし、トナーに磁気ローラから印加する現像バイアス電圧を300V〜500Vとし、転写器５としてコロトロン帯電器を使用し、用紙６に転写器５から印加する電流を−0.4mA〜−1.6mAとしたとき、印刷速度46インチ／秒で印刷を行うことは可能であった。しかし、印刷速度を６６インチ／秒まで高速化して印刷を行ったところ、印刷速度46インチ／秒のときは起きなかった新たな課題が起きることがわかった。 In this image forming apparatus, a corotron charger is used as the charger 2, the surface potential of the photosensitive drum 1 is set to 500V to 750V by the charger 2, and the developing bias voltage applied to the toner from the magnetic roller is set to 300V to 500V. When a corotron charger was used as the transfer device 5 and the current applied to the paper 6 from the transfer device 5 was -0.4 mA to -1.6 mA, printing was possible at a printing speed of 46 inches / second. However, when printing was performed at a printing speed of 66 inches / second, it was found that a new problem that did not occur when the printing speed was 46 inches / second occurred.
これは、高速化に伴い、用紙６への印刷前後、すなわち、印刷開始のスイッチを入れてから用紙６を搬送・印刷が開始する際、及び、用紙６の搬送・印刷から停止する際の、微かな速度差から用紙６に起こる衝撃、惰性によるものである。この衝撃、惰性により、用紙６がたるみ、用紙６が感光体ドラム１に接触し、用紙６に感光体ドラム１に付着した残存トナーが付いてしまうのである。 This is because with the increase in speed, before and after printing on the paper 6, that is, when the paper 6 is started to be transported / printed after the print start switch is turned on, and when the paper 6 is stopped from being transported / printed, This is due to impact and inertia occurring on the paper 6 due to a slight speed difference. Due to the impact and inertia, the sheet 6 is slackened, the sheet 6 comes into contact with the photosensitive drum 1, and residual toner attached to the photosensitive drum 1 is attached to the sheet 6.
用紙６の搬送は搬送ベルト８で行っているが、搬送速度が高速であると、衝撃を搬送ベルト８により吸収することができない。とりわけ、用紙６の搬送停止直後は顕著である。用紙６の汚れ防止も兼ね、転写装置を搬送停止直後に感光体ドラム１から離すような（退避する）動作を行うようにしても上記の問題は解決しなかった。これは連続した記録媒体に特有の現象と考えられる。用紙６に最も汚れが生じる場所は、２つの搬送ベルト８から最も離れた位置である、転写器５と感光体ドラム１で形成される転写ニップ部であった。 The paper 6 is transported by the transport belt 8, but if the transport speed is high, the impact cannot be absorbed by the transport belt 8. This is particularly noticeable immediately after the conveyance of the paper 6 is stopped. Even if the transfer device is moved away (retracted) from the photosensitive drum 1 immediately after the conveyance is stopped, the above problem is not solved. This is considered a phenomenon peculiar to continuous recording media. The place where the paper 6 is most stained is the transfer nip portion formed by the transfer device 5 and the photosensitive drum 1, which is the position farthest from the two conveying belts 8.
そこで、この用紙６の汚れを防ぐ手段として、図２に示すように、搬送開始前後と、搬送停止前後に、帯電したトナーを転写する際に使用している逆極性のバイアスと逆の極性、すなわち、帯電したトナーと同極性のバイアスを転写器５から用紙６に印加する。 Therefore, as a means for preventing the paper 6 from being soiled, as shown in FIG. 2, a polarity opposite to the reverse polarity bias used when transferring the charged toner before and after the start of transport and before and after the stop of transport, That is, a bias having the same polarity as the charged toner is applied from the transfer device 5 to the paper 6.
帯電したトナーと同極性のバイアスを印加する際の制御手段としては、図２に示すように、印刷中から用紙６が停止する直前に転写器５から用紙６にトナーと同極性のプラスのバイアス電流を印加し、用紙６を停止した後に転写装置が感光体ドラム１から離れ、バイアス電流を切る、という動作を行うようにする。これら一連の動作は１秒以内の短時間に行われるようにする。つまり、搬送停止前後の１秒に満たない所定の時間だけ転写器５から用紙６にトナーと同極性のプラスのバイアス電流を印加する。このようにすることにより、用紙６にトナーが付着しにくくなる。 As a control means for applying a bias having the same polarity as the charged toner, as shown in FIG. 2, a positive bias having the same polarity as the toner is transferred from the transfer device 5 to the paper 6 immediately before the paper 6 stops during printing. After the current is applied and the sheet 6 is stopped, the transfer device is separated from the photosensitive drum 1 and the bias current is turned off. These series of operations are performed in a short time within one second. That is, a positive bias current having the same polarity as the toner is applied from the transfer unit 5 to the sheet 6 for a predetermined time less than 1 second before and after the conveyance stop. By doing so, it becomes difficult for toner to adhere to the paper 6.
なお、転写器５から印加するバイアス電流は、トナーを用紙６へ転写するときに使用するトナーと逆極性の電流値と絶対値で同じでも良いが、感光体ドラム１に付着しているトナー量を考慮して、低くしても良い。 Note that the bias current applied from the transfer unit 5 may be the same as the current value and the absolute value of the opposite polarity to the toner used when transferring the toner to the paper 6, but the amount of toner adhering to the photosensitive drum 1. In consideration of this, it may be lowered.
例えば、トナーを用紙６へ転写するために転写器５から印加したバイアス電流を−0.4mA〜−1.6mAとし、用紙６が停止する直前に印加したバイアス電流を0.2mA〜0.6mAとすると、停止直後に受ける衝撃や惰性によるトナー汚れを防ぐことができた。 For example, if the bias current applied from the transfer unit 5 to transfer the toner to the paper 6 is −0.4 mA to −1.6 mA, and the bias current applied immediately before the paper 6 is stopped is 0.2 mA to 0.6 mA, the current stops. It was possible to prevent the toner from being stained due to the impact and inertia that was received immediately after.
また、図２に示すように、印刷動作開始時にも転写器５から用紙６に同様なバイアスを印加するようにする。その制御手段としては、転写器５から用紙６にトナーと同極性のプラスのバイアス電流を印加し、転写装置を感光体ドラム１へ近づけ、用紙６を搬送するとほぼ同時にトナーと逆極性のマイナスのバイアス電流を印加して印刷を行うようにする。これら一連の動作は１秒以内に行われるようにする。つまり、搬送開始前後の１秒に満たない所定の時間だけ転写器５から用紙６にトナーと同極性のプラスのバイアス電流を印加する。 Further, as shown in FIG. 2, a similar bias is applied from the transfer unit 5 to the paper 6 at the start of the printing operation. As the control means, a positive bias current having the same polarity as that of toner is applied from the transfer device 5 to the paper 6, the transfer device is brought close to the photosensitive drum 1, and the paper 6 is conveyed, and at the same time, a negative polarity opposite to that of the toner is obtained. Printing is performed by applying a bias current. These series of operations are performed within one second. That is, a positive bias current having the same polarity as the toner is applied from the transfer unit 5 to the paper 6 for a predetermined time less than 1 second before and after the start of conveyance.
印刷動作開始時と停止直前に転写器５から印加するトナーと同極性のバイアスは、同じ電流値でも問題ないが、用紙６が受ける衝撃は印刷動作開始時の方が停止時より少ない。そこで、動作開始時に印加する電流、印加する時間を停止直前時より低く、短くすることも可能である。 The bias having the same polarity as the toner applied from the transfer unit 5 at the start of the printing operation and immediately before the stop has no problem even at the same current value, but the impact received by the paper 6 is less at the start of the printing operation than at the stop. Therefore, the current applied at the start of operation and the application time can be made lower and shorter than those immediately before the stop.
例えば、トナーを用紙６へ転写するために転写器５から印加したバイアス電流を−0.4mA〜−1.6mAとし、印刷動作開始時に用紙６へ印加したバイアス電流を0.2mA〜0.4mAとし、停止する直前に印加したバイアス電流を0.2mA〜0.6mAとしたとき、開始直後に受ける衝撃や惰性によるトナー汚れを防ぐことができた。 For example, the bias current applied from the transfer unit 5 to transfer the toner to the paper 6 is set to −0.4 mA to −1.6 mA, the bias current applied to the paper 6 at the start of the printing operation is set to 0.2 mA to 0.4 mA, and the operation is stopped. When the bias current applied immediately before was set to 0.2 mA to 0.6 mA, it was possible to prevent toner smearing due to impact and inertia received immediately after the start.
つまり、搬送開始前後、搬送停止前後に、転写器５から用紙６にトナーと同極性のバイアスを印加することにより、搬送開始直後、搬送停止直後に用紙６が受ける衝撃や惰性のために生じる用紙６へのトナー汚れを防ぐことができるようになる。 In other words, by applying a bias having the same polarity as the toner from the transfer device 5 to the paper 6 before and after the start of transport and before and after the transport stop, the paper 6 is generated due to the impact and inertia that the paper 6 receives immediately after the start of transport and immediately after the stop of transport. 6 can prevent the toner from being stained with toner.
また、トナーを用紙に転写する際に転写器５から用紙６に印加する帯電したトナーと逆極性のバイアス電流値をIt1とし、搬送停止前後に転写器５から用紙６に印加する帯電したトナーと同極性のバイアス電流値をIt2としたときに、｜It2｜≦｜It1｜となるようにしても良い。また、搬送開始前後に転写器５から用紙６に印加する帯電したトナーと同極性のバイアス電流値をIt3としたとき、｜It3｜≦｜It1｜となるようにすると良い。また、｜It3｜≦｜It2｜≦｜It1｜となるようにすると良い。 Also, it is assumed that the bias current value of the opposite polarity to the charged toner applied from the transfer unit 5 to the sheet 6 when transferring the toner to the sheet is It1, and the charged toner applied from the transfer unit 5 to the sheet 6 before and after the conveyance is stopped. If the bias current value of the same polarity is It2, it may be such that | It2 | ≦ | It1 |. Also, it is preferable that | It3 | ≦ | It1 | when the bias current value having the same polarity as the charged toner applied from the transfer device 5 to the paper 6 before and after the start of conveyance is It3. Also, it is preferable that | It3 | ≦ | It2 | ≦ | It1 |.
このようにすることにより、搬送開始直後、搬送停止直後に用紙６が受ける衝撃や惰性のために生じる用紙６へのトナー汚れを防ぐことができるようになる。 By doing so, it is possible to prevent toner stains on the paper 6 due to the impact and inertia that the paper 6 receives immediately after the start of transport and immediately after the stop of transport.
また、別の実施形態として画像形成装置を2台並べて印刷することを考える。１台目と２台目との基本的な構成は同じである。1台目で連続した記録媒体である用紙６の片面を印刷し、途中で用紙６を反転する装置を介して2台目で用紙６の裏面を印刷する。これについて図３および４を用いて説明する。先ず、図３について説明する。本実施例は、画像形成装置である第１プリンタ１０１と第２プリンタ１０２とで構成される。さらに、第１プリンタ１０１は、第１プリンタエンジン１０３と、第１プリンタコントローラ１０４によって構成し、第２プリンタ１０２は、第２プリンタエンジン１０５と、第２プリンタコントローラ１０６によって構成される。また、第１プリンタエンジン１０３を第１プリンタコントローラ１０４によって制御し、第２プリンタエンジン１０５を第２プリンタコントローラ１０６によって制御している。また、反転装置１０８は、第１プリンタ１０１と第２プリンタ１０２の間にあり、第１プリンタ１０１で印刷した用紙を反転し、第２プリンタ１０２へ送る装置である。印刷動作情報、制御情報および印刷データの受け渡しについて説明すると、第１プリンタコントローラ１０４と第２プリンタコントローラ１０６間の印刷動作情報、制御情報および印刷データのやり取りは、ケーブル１０７を介して行う。なお、第１プリンタ１０１と第２プリンタ１０２との基本構成は同じである。また、図４は図３のケーブル１０７の代わりに、第１プリンタコントローラ１０４と第２プリンタコントローラ１０６とがネットワーク１１０で接続されている。なお、ネットワーク１１０には上位装置１０９が接続されている。なお、一般的にこれらの構成を画像形成システムと呼ぶ。また、本実施例では第１プリンタ１０１が用紙の表面を印刷し、第２プリンタ１０２が用紙の裏面を印刷する。
As another embodiment, consider that two image forming apparatuses are printed side by side. The basic configuration of the first unit and the second unit is the same. One side of the sheet 6 as a continuous recording medium is printed on the first unit, and the back side of the sheet 6 is printed on the second unit via a device that reverses the sheet 6 in the middle. This will be described with reference to FIGS. First, FIG. 3 will be described. This embodiment includes a
通常、画像形成装置で両面を印刷する際、表面（1面）と裏面（2面）で転写のバイアスを変える必要性が指摘されている。これは、表面の印刷にトナー像を固定するためにかかる定着器９の熱圧着を用紙６が受けることにより、表面形状および含水量が変わってしまうためである。よって、印刷時に転写のバイアスとして印加する電圧は裏面の方を高くすると良い。ここでは、転写のバイアスとして電圧ではなく、電流を印加するいわゆる定電流制御なので、裏面の印刷時でも転写器５から印加するバイアスはほとんど変えずに済む。しかし、坪量の大きい用紙を印刷する時は、絶対値でやや高めの電流を印加するようにすると良い。 In general, when printing on both sides with an image forming apparatus, it has been pointed out that it is necessary to change the transfer bias between the front side (one side) and the back side (two sides). This is because the surface shape and water content change when the paper 6 receives the thermocompression bonding of the fixing device 9 for fixing the toner image on the surface printing. Therefore, the voltage applied as a transfer bias at the time of printing should be higher on the back side. Here, since the transfer bias is a so-called constant current control in which a current is applied instead of a voltage, the bias applied from the transfer device 5 can be hardly changed even when printing on the back surface. However, when printing a sheet having a large basis weight, it is preferable to apply a slightly higher current in absolute value.
そこで、例えば、裏面を印刷する２台目の画像形成装置において、転写器５から印加するバイアス電流を1台目のものより全電流の領域で−0.1mA〜−0.2mAで設定したとき、両面印刷においても用紙６が搬送直後、停止直後に受ける衝撃や惰性によるトナー汚れを防ぐことができた。つまり、裏面を印刷する２台目の画像形成装置において、転写器５から印加するバイアス電流を1台目のものより大きくすることにより、両面印刷においても用紙６が搬送直後、停止直後に受ける衝撃や惰性によるトナー汚れを防ぐことができる。 Therefore, for example, in the second image forming apparatus that prints the back side, when the bias current applied from the transfer unit 5 is set to −0.1 mA to −0.2 mA in the entire current region from the first one, Also in printing, it was possible to prevent toner stains due to impact and inertia that the sheet 6 receives immediately after conveyance and immediately after stopping. In other words, in the second image forming apparatus that prints the back side, the bias current applied from the transfer unit 5 is made larger than that of the first unit, so that the impact that the paper 6 receives immediately after conveyance and immediately after stopping in double-sided printing. And toner stains due to inertia.
つまり、連続した記録媒体に対し、搬送開始前後、搬送停止前後に転写器５から用紙６にトナーと同極性のバイアスを印加する画像形成装置を複数台使用して画像形成を行う際は、1台目の前記画像形成装置において転写器５から用紙６に印加さえるバイアスと、２台目以降の画像形成装置において転写器５から用紙６に印加するバイアスと、を異なる値にすると良い。 That is, when performing image formation on a continuous recording medium using a plurality of image forming apparatuses that apply a bias having the same polarity as the toner from the transfer device 5 to the paper 6 before and after the conveyance start and before the conveyance stop, The bias applied from the transfer unit 5 to the paper 6 in the second image forming apparatus and the bias applied from the transfer unit 5 to the paper 6 in the second and subsequent image forming apparatuses may be set to different values.
１台目の画像形成装置において、トナーを用紙に転写する際に転写器５から用紙６に印加する帯電したトナーと逆極性のバイアス電流値をIt1とし、搬送停止前後に転写器５から用紙６に印加する帯電したトナーと同極性のバイアス電流値をIt2とし、搬送開始前後に転写器５から用紙６に印加する帯電したトナーと同極性のバイアス電流値をIt3とし、２台目以降の画像形成装置において、トナーを用紙に転写する際に転写器５から用紙６に印加する帯電したトナーと逆極性のバイアス電流値をIt4とし、搬送停止前後に転写器５から用紙６に印加する帯電したトナーと同極性のバイアス電流値をIt5とし、搬送開始前後に転写器５から用紙６に印加する帯電したトナーと同極性のバイアス電流値をIt6としたときに、｜It2｜≦｜It5｜≦｜It1｜≦｜It4｜となるようにすると良い。また、｜It3｜≦｜It6｜≦｜It1｜≦｜It4｜となるようにすると良い。具体的なこの電流値の設定の方法についてだが、例えば、図３を例に挙げると、第１プリンタ１０１で印刷動作が設定されると、第１プリンタコントローラ１０４がケーブル１０７を介して第２プリンタコントローラ１０６にその第１プリンタ１０１の印刷動作の設定情報を送り、第２プリンタコントローラ１０６がその情報に基づいて第２プリンタ１０２での印刷動作を設定する構成が挙げられる。また、図４を例に挙げると、プリンタの動作を設定することが可能な上位装置１０９がネットワーク１１０を介して、用紙６の表面を印刷することに決めた第１プリンタ１０１および用紙６の裏面を印刷することに決めた第２プリンタ１０２のそれぞれのコントローラに、印刷動作の設定情報を送信して印刷動作を設定する構成にしても構わない。なお、オペレータが第１プリンタ１０１と第２プリンタ１０２と図示しない操作パネル等で直接操作して、設定する構成にしても構わない。
In the first image forming apparatus, when the toner is transferred to the sheet, the bias current value of the opposite polarity to the charged toner applied from the transfer unit 5 to the sheet 6 is It1, and the transfer unit 5 to the sheet 6 before and after the conveyance stop. The bias current value of the same polarity as that of the charged toner applied to the toner is It2, and the bias current value of the same polarity as that of the charged toner applied to the paper 6 from the transfer device 5 before and after the start of conveyance is It3. In the forming apparatus, when the toner is transferred to the sheet, the bias current value having a polarity opposite to that of the charged toner applied from the transfer unit 5 to the sheet 6 is It4, and the charging is applied from the transfer unit 5 to the sheet 6 before and after the conveyance is stopped. When it5 is a bias current value having the same polarity as that of the toner and It6 is a bias current value having the same polarity as that of the charged toner applied to the paper 6 from the transfer device 5 before and after the start of conveyance, it is | It2 | ≦ | It5 | ≦ ｜ It1 ｜ ≦ ｜ It4 ｜ So as to better to. Also, it is preferable to satisfy | It3 | ≦ | It6 | ≦ | It1 | ≦ | It4 |. As a specific method for setting the current value, for example, referring to FIG. 3, when the printing operation is set by the
このようにすることにより、両面印刷の際にも、搬送開始直後、搬送停止直後に用紙６が受ける衝撃や惰性のために生じる用紙６へのトナー汚れを防ぐことができるようになる。 This makes it possible to prevent toner stains on the paper 6 due to the impact and inertia that the paper 6 receives immediately after the start of transport and immediately after the stop of transport even during duplex printing.
以上、本発明の好適な実施の形態により本発明を説明した。ここでは特定の具体例を示して本発明を説明したが、特許請求の範囲に定義された本発明の広範囲な趣旨および範囲から逸脱することなく、これら具体例に様々な修正および変更が可能である。 The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments thereof, various modifications and changes can be made to these embodiments without departing from the broader spirit and scope of the invention as defined in the claims. is there.
本発明における画像形成装置は、用紙を搬送する搬送手段と、表面にトナーによる像を形成する像担持体と、像担持体に対向する位置に配置され、搬送手段により搬送される用紙にトナーと逆極性のバイアス電流を印加する転写器とを有し、用紙は連続紙であり、転写器は、搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間は、トナーと同極性のバイアス電流を、搬送手段により搬送される用紙に印加するようにしてもよい。 An image forming apparatus according to the present invention includes a conveying unit that conveys a sheet, an image carrier that forms an image of toner on the surface, and a toner that is disposed at a position facing the image carrier and is conveyed by the conveying unit. A transfer device that applies a bias current of reverse polarity, the paper is a continuous paper, and the transfer device has a first time from a time point before stopping the paper transport by the transport means to a time point after stopping the paper transport . During a predetermined time, a bias current having the same polarity as that of the toner may be applied to the sheet conveyed by the conveying unit.
また、本発明における画像形成装置は、前記転写器は、搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第２の所定時間の間は、前記トナーと同極性のバイアス電流を、前記搬送手段により搬送される用紙に印加するようにしても良い。 In the image forming apparatus according to the aspect of the invention, the transfer unit may have the same polarity as that of the toner during a second predetermined time from a time point before the start of paper transport by the transport unit to a time point after the start of paper transport. This bias current may be applied to the paper conveyed by the conveying means.
また、本発明における画像形成装置は、前記転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値をＩｔ１とし、前記搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ２とするときに、｜Ｉｔ２|≦｜Ｉｔ１｜であるようにしても良い。 In the image forming apparatus according to the present invention, the bias current having a polarity opposite to that of the toner applied to the paper by the transfer unit is set to It1, and the paper is transported from a time point before the transport of the paper by the transport unit is stopped. of the first value of the toner of the same polarity as the bias current applied to the sheet by the transfer device during a predetermined time point after stop when the It2, | It2 | ≦ | It1 | a You may do it.
また、本発明における画像形成装置は、前記転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値をＩｔ１とし、前記搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第１の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ３とするときに、｜Ｉｔ３|≦｜Ｉｔ１｜であるようにしても良い。 In the image forming apparatus according to the present invention, it is assumed that the bias current having a polarity opposite to that of the toner applied to the paper by the transfer device is It1, and the paper is transported from the time before the transport of the paper by the transport unit is started. of the first value of the toner of the same polarity as the bias current the applied to the sheet by the transfer unit during a predetermined time point after the start when the It3, | It3 | ≦ | It1 | a You may do it.
また、本発明における画像形成装置は、前記転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値をＩｔ１とし、前記搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ２とし、前記搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第１の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ３とするときに、｜Ｉｔ３|≦｜Ｉｔ２｜≦｜Ｉｔ１｜であるようにしても良い。 In the image forming apparatus according to the present invention, the bias current having a polarity opposite to that of the toner applied to the paper by the transfer unit is set to It1, and the paper is transported from a time point before the transport of the paper by the transport unit is stopped. time of the first value of the toner of the same polarity as the bias current the applied to the sheet by the transfer unit during a predetermined time point after stopping the It2, before the start of the conveyance of the sheet by the conveying means When it is assumed that the value of the bias current having the same polarity as that of the toner applied to the paper by the transfer device during the first predetermined time after the start of conveyance of the paper from the time of | It3 | ≦ | It2 | ≦ | It1 | may be satisfied.
また、本発明における画像形成装置は、前記用紙と前記転写器との間の距離が所定の距離になるように前記用紙を搬送するガイドを有するようにしても良い。 The image forming apparatus according to the present invention may include a guide for transporting the paper so that a distance between the paper and the transfer device is a predetermined distance.
また、本発明における画像形成装置は、前記転写器と前記ガイドとにより構成される転写装置を有し、前記転写装置は、印刷時は前記用紙を前記像担持体に接触させる位置をとり、印刷時以外は前記用紙を前記像担持体から離す位置をとるようにしても良い。 The image forming apparatus according to the present invention includes a transfer device including the transfer device and the guide, and the transfer device takes a position where the paper is brought into contact with the image carrier during printing, and performs printing. Except at times, the paper may be positioned away from the image carrier.
また、本発明における画像形成装置は、接地を行うアースを有し、前記ガイドと前記アースとの結線に間には１ＭΩ以上の抵抗があるようにしても良い。 The image forming apparatus according to the present invention may have a ground for grounding, and a resistance of 1 MΩ or more may be provided between the guide and the ground.
また、本発明における画像形成システムは、前記第１の転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値は、前記第２の転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値とは異なり、前記第１の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値は、前記第２の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第２の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値と異なるようにしても良い。 In the image forming system according to the present invention, the value of a bias current having a polarity opposite to that of the toner applied to the paper by the first transfer device is applied to the paper by the second transfer device. Unlike the bias current value having a polarity opposite to that of the first transfer unit, the transfer unit causes the transfer unit to perform the first predetermined time from the time point before the stop of the sheet transport by the first transport unit to the time point after the stop of the sheet transport. The value of the bias current having the same polarity as that of the toner applied to the sheet is between a time point before the stop of the sheet transport by the second transport unit and a second predetermined time after the stop of the sheet transport. The bias current applied to the paper by the transfer device may be different from the value of the bias current having the same polarity as that of the toner.
また、本発明における画像形成システムは、前記第１の転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値をＩｔ１とし、前記第１の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ２とし、前記第２の転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値をＩｔ４とし、前記第２の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第２の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ５としたとき、｜Ｉｔ２｜≦｜Ｉｔ５｜≦｜Ｉｔ１｜≦｜Ｉｔ４｜であるようにしても良い。 In the image forming system according to the present invention, the value of a bias current having a polarity opposite to that of the toner applied to the paper by the first transfer device is It1, and before the paper conveyance by the first conveyance unit is stopped. the first value of the toner of the same polarity as the bias current applied to the sheet by the transfer unit during a predetermined time period and It2, the second transfer unit from the point of time after the stopping of the feed of the paper As a result, a bias current having a polarity opposite to that of the toner applied to the sheet is set to It4, and a second predetermined value from a time point before stopping the sheet transport by the second transport unit to a time point after stopping the sheet transport. When it is assumed that the value of the bias current having the same polarity as that of the toner applied to the paper by the transfer unit during the time is It5, it is assumed that | It2 | ≦ | It5 | ≦ | It1 | ≦ | It4 | Also good
また、本発明における画像形成システムは、前記第１の転写器は、前記第１の搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第３の所定時間の間は、前記トナーと同極性のバイアス電流を、前記第１の搬送手段により搬送される用紙に印加し、前記第２の転写器は、前記第２の搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第４の所定時間の間は、前記トナーと同極性のバイアス電流を、前記第２の搬送手段により搬送される用紙に印加するようにしても良い。 Further, in the image forming system according to the present invention, the first transfer unit is configured to operate for a third predetermined time from a time point before the start of paper transport by the first transport unit to a time point after the start of paper transport. Applies a bias current having the same polarity as that of the toner to the paper transported by the first transporting means, and the second transfer device has a time point before the start of paper transporting by the second transporting means. during the fourth predetermined time point after the start of the conveyance of the sheet from the bias current of the same polarity as toner, it may be applied to the sheet conveyed by said second conveying means.
また、本発明における画像形成システムは、前記第１の搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第３の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値は、前記第２の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第４の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値と異なるようにしても良い。 In the image forming system according to the present invention, the transfer unit transfers the sheet to the sheet during a third predetermined time from the time before the start of the sheet transport by the first transport unit to the time after the start of the sheet transport. The value of the bias current having the same polarity as that of the toner is applied during the fourth predetermined time from the time point before the stop of the sheet transport by the second transport unit to the time point after the stop of the sheet transport. A bias current value having the same polarity as that of the toner applied to the paper by a container may be used.
また、本発明における画像形成システムは、前記第１の転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値をＩｔ１とし、前記第１の搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第３の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ３とし、前記第２の転写器により前記用紙に印加される前記トナーと逆極性のバイアス電流の値をＩｔ４とし、前記第２の搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第４の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値をＩｔ６としたとき、｜Ｉｔ３｜≦｜Ｉｔ６｜≦｜Ｉｔ１｜≦｜Ｉｔ４｜であるようにしても良い。また、本発明における画像形成システムは、前記第１の画像形成装置と前記第２の画像形成装置との間に反転装置を備え、前記反転装置は、前記第１の画像形成装置で印刷した用紙を反転し、前記第２の画像形成装置へ送るようにしても良い。 In the image forming system according to the present invention, the bias current having a polarity opposite to that of the toner applied to the paper by the first transfer device is set to It1, and before the paper is started to be transported by the first transport unit. The value of the bias current having the same polarity as that of the toner applied to the paper by the transfer device during a third predetermined time after the start of the conveyance of the paper from the time of is set to It3, and the second transfer device As a result, a bias current having a polarity opposite to that of the toner applied to the paper is set to It4, and a fourth predetermined time from a time point before the start of paper transport by the second transport means to a time point after the start of paper transport. When it is assumed that the value of the bias current having the same polarity as that of the toner applied to the paper by the transfer unit during the time is It6, it is assumed that | It3 | ≦ | It6 | ≦ | It1 | ≦ | It4 | Also good The image forming system according to the present invention further includes a reversing device between the first image forming device and the second image forming device, and the reversing device is a sheet printed by the first image forming device. May be reversed and sent to the second image forming apparatus.
１ 感光体ドラム
２ 帯電器
３ 露光装置
４ 現像器
５ 転写器
６ 用紙
７ 清掃器
８ 搬送ベルト
９ 定着器
１０１ 第１プリンタ
１０２ 第２プリンタ
１０３ 第１プリンタエンジン
１０４ 第１プリンタコントローラ
１０５ 第２プリンタエンジン
１０６ 第２プリンタコントローラ
１０７ ケーブル
１０８ 反転装置
１０９ 上位装置
１１０ ネットワーク
DESCRIPTION OF SYMBOLS 1 Photosensitive drum 2 Charging device 3 Exposure apparatus 4 Developing device 5 Transfer device 6 Paper 7 Cleaning device 8 Conveying belt 9
Claims (15)
表面にトナーによる像を形成する像担持体と、
前記像担持体に対向する位置に配置され、前記搬送手段により搬送される用紙に前記トナーと逆極性のバイアス電流を印加する転写器と、を有し、
前記用紙は連続紙であり、
前記転写器は、前記搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間は、前記トナーと同極性のバイアス電流を、前記搬送手段により搬送される用紙に印加することを特徴とする画像形成装置。 Conveying means for conveying paper;
An image carrier that forms an image with toner on the surface;
A transfer unit that is disposed at a position facing the image carrier and applies a bias current having a polarity opposite to that of the toner to a sheet conveyed by the conveying unit;
The paper is continuous paper,
The transfer unit applies a bias current having the same polarity as that of the toner by the conveying unit for a first predetermined time from a time point before the conveyance of the sheet by the conveying unit to a point after the conveyance of the sheet is stopped. An image forming apparatus, wherein the image forming apparatus is applied to a sheet to be conveyed.
前記転写装置は、印刷時は前記用紙を前記像担持体に接触させる位置をとり、印刷時以外は前記用紙を前記像担持体から離す位置をとることを特徴とする請求項６に記載の画像形成装置。 A transfer device including the transfer device and the guide;
The image according to claim 6, wherein the transfer device takes a position where the paper is brought into contact with the image carrier during printing, and takes a position where the paper is separated from the image carrier except during printing. Forming equipment.
前記ガイドと前記アースとの結線に間には１ＭΩ以上の抵抗があることを特徴とする請求項１乃至７のいずれか１項に記載の画像形成装置。 Have a ground to do the grounding,
The image forming apparatus according to claim 1, wherein a resistance of 1 MΩ or more is present between the guide and the ground.
前記第１の画像形成装置は、用紙を搬送する第１の搬送手段と、
表面にトナーによる像を形成する第１の像担持体と、
前記第１の像担持体に対向する位置に配置され、前記第１の搬送手段により搬送される用紙に前記トナーと逆極性のバイアス電流を印加する第１の転写器と、を有し、
前記第２の画像形成装置は、前記用紙を搬送する第２の搬送手段と、
表面にトナーによる像を形成する第２の像担持体と、
前記第２の像担持体に対向する位置に配置され、前記第２の搬送手段により搬送される用紙に前記トナーと逆極性のバイアス電流を印加する第２の転写器と、を有し、
前記用紙は連続紙であり、
前記第１の転写器は、前記第１の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間は、前記トナーと同極性のバイアス電流を、前記第１の搬送手段により搬送される用紙に印加し、
前記第２の転写器は、前記第２の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第２の所定時間の間は、前記トナーと同極性のバイアス電流を、前記第２の搬送手段により搬送される用紙に印加することを特徴とする画像形成システム。 An image forming system comprising a first image forming apparatus and a second image forming apparatus,
The first image forming apparatus includes a first transport unit that transports a sheet;
A first image carrier that forms an image of toner on the surface;
A first transfer unit disposed at a position facing the first image carrier and applying a bias current having a polarity opposite to that of the toner to a sheet conveyed by the first conveying unit;
The second image forming apparatus includes: a second transport unit that transports the paper;
A second image carrier that forms an image of toner on the surface;
A second transfer unit that is disposed at a position facing the second image carrier and applies a bias current having a polarity opposite to that of the toner to a sheet conveyed by the second conveying unit;
The paper is continuous paper,
The first transfer unit has a bias current having the same polarity as that of the toner for a first predetermined time from a time point before the stop of the paper transport by the first transport unit to a time point after the stop of the paper transport. Is applied to the paper conveyed by the first conveying means,
The second transfer unit has a bias current having the same polarity as that of the toner during a second predetermined time from a time point before the stop of paper transport by the second transport unit to a time point after the stop of paper transport. Is applied to the sheet conveyed by the second conveying means.
前記第１の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第１の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値は、前記第２の搬送手段による用紙の搬送の停止前の時点から用紙の搬送の停止後の時点の第２の所定時間の間に前記転写器により前記用紙に印加される前記トナーと同極性のバイアス電流の値と異なることを特徴とする請求項９に記載の画像形成システム。 The value of the bias current having a polarity opposite to that of the toner applied to the sheet by the first transfer unit is the value of the bias current having a polarity opposite to that of the toner applied to the sheet by the second transfer unit. Differently
A bias having the same polarity as that of the toner applied to the paper by the transfer unit during a first predetermined time from a time point before the stop of paper transport by the first transport means to a time point after the stop of paper transport. the value of the current, the toner is applied to the sheet by the transfer device during a second predetermined time point after cessation of conveyance of the sheet from the point before stopping the conveyance of the sheet by the second conveying means The image forming system according to claim 9, wherein the bias current value is different from the bias current value having the same polarity.
前記第２の転写器は、前記第２の搬送手段による用紙の搬送の開始前の時点から用紙の搬送の開始後の時点の第４の所定時間の間は、前記トナーと同極性のバイアス電流を、前記第２の搬送手段により搬送される用紙に印加することを特徴とする請求項９乃至１１のいずれか１項に記載の画像形成システム。 The first transfer unit has a bias current having the same polarity as that of the toner during a third predetermined time from a time before the start of paper transport by the first transport means to a time after the start of paper transport. Is applied to the paper conveyed by the first conveying means,
The second transfer device has a bias current having the same polarity as that of the toner during a fourth predetermined time from a time before the start of paper transport by the second transport means to a time after the start of paper transport. 12. The image forming system according to claim 9, wherein the image forming system is applied to a sheet conveyed by the second conveying unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009186428A JP5359673B2 (en) | 2009-08-11 | 2009-08-11 | Image forming apparatus and image forming system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009186428A JP5359673B2 (en) | 2009-08-11 | 2009-08-11 | Image forming apparatus and image forming system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2011039285A JP2011039285A (en) | 2011-02-24 |
| JP5359673B2 true JP5359673B2 (en) | 2013-12-04 |
Family
ID=43767119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009186428A Expired - Fee Related JP5359673B2 (en) | 2009-08-11 | 2009-08-11 | Image forming apparatus and image forming system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5359673B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5727893B2 (en) * | 2011-08-22 | 2015-06-03 | 株式会社沖データ | Power supply device and image forming apparatus using the same |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2632940B2 (en) * | 1988-07-19 | 1997-07-23 | キヤノン株式会社 | Transfer device |
| JPH02226282A (en) * | 1989-02-28 | 1990-09-07 | Canon Inc | Transfer device |
| JP3865026B2 (en) * | 1998-11-27 | 2007-01-10 | 富士ゼロックス株式会社 | Image forming apparatus |
| JP3713165B2 (en) * | 1999-07-12 | 2005-11-02 | 富士ゼロックス株式会社 | Continuous media printer |
| JP2001201959A (en) * | 2000-01-18 | 2001-07-27 | Murata Mach Ltd | Image forming device |
| JP2001287421A (en) * | 2000-04-07 | 2001-10-16 | Hitachi Koki Co Ltd | Perfecting system for continuous form |
| US7085526B2 (en) * | 2001-07-30 | 2006-08-01 | Fuji Xerox Co., Ltd. | Image forming method and image forming apparatus |
| JP2004184922A (en) * | 2002-12-06 | 2004-07-02 | Hitachi Printing Solutions Ltd | Printing control method for electrophotographic continuous paper printer |
| JP4203735B2 (en) * | 2003-06-18 | 2009-01-07 | 富士ゼロックス株式会社 | Sheet guidance processing apparatus and image forming apparatus using the same |
| JP2006091159A (en) * | 2004-09-21 | 2006-04-06 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP2006091542A (en) * | 2004-09-24 | 2006-04-06 | Fuji Xerox Co Ltd | Image recording apparatus |
| JP5214093B2 (en) * | 2005-01-31 | 2013-06-19 | 京セラドキュメントソリューションズ株式会社 | Image forming apparatus |
| JP2006248733A (en) * | 2005-03-11 | 2006-09-21 | Fuji Xerox Co Ltd | Image forming device |
| JP2006349967A (en) * | 2005-06-15 | 2006-12-28 | Ricoh Co Ltd | Image forming apparatus |
| JP5123700B2 (en) * | 2007-03-13 | 2013-01-23 | 株式会社リコー | Image forming apparatus and duplex image forming apparatus using the same |
| JP2009163051A (en) * | 2008-01-08 | 2009-07-23 | Ricoh Co Ltd | Image forming apparatus and tandem type image forming apparatus |
-
2009
- 2009-08-11 JP JP2009186428A patent/JP5359673B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011039285A (en) | 2011-02-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6035771B2 (en) | Transfer device and image forming apparatus | |
| JP2004099293A (en) | Image forming device | |
| JP6111894B2 (en) | Image forming apparatus | |
| EP2775353B1 (en) | Electrophotographic image forming apparatus | |
| JP2007057902A (en) | Image forming apparatus | |
| US7130574B2 (en) | Image forming device with multimode duplexer | |
| JP2016091012A (en) | Image forming apparatus | |
| JP5359673B2 (en) | Image forming apparatus and image forming system | |
| JP2016159438A (en) | Image forming device and control method for the same, and program | |
| JP2013139331A (en) | Conveying direction switching device of recording material, image forming apparatus, and program | |
| JP2005003784A (en) | Image forming apparatus | |
| JP4307128B2 (en) | Laser printer | |
| JP2010145782A (en) | Image forming apparatus | |
| JP2007219475A (en) | Image forming apparatus | |
| JP2009058821A (en) | Image forming apparatus | |
| JP6111923B2 (en) | Image forming apparatus | |
| US20130028645A1 (en) | Multi-component duplex printer | |
| JP2019164220A (en) | Image forming apparatus | |
| JP6746878B2 (en) | Charge control device, image forming apparatus, and image forming system | |
| JP2005164722A (en) | Image forming apparatus | |
| JP2014059460A (en) | Image forming apparatus | |
| JP2010210662A (en) | Image forming apparatus | |
| JP4957157B2 (en) | Image forming apparatus | |
| JP2012181482A (en) | Image forming apparatus | |
| JP2010002533A (en) | Image forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20120528 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20130614 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20130618 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20130709 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20130806 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20130819 |
|
| R151 | Written notification of patent or utility model registration |
Ref document number: 5359673 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R151 |
|
| LAPS | Cancellation because of no payment of annual fees |