JP2007065535A - Image forming method and apparatus - Google Patents

Image forming method and apparatus Download PDF

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JP2007065535A
JP2007065535A JP2005254454A JP2005254454A JP2007065535A JP 2007065535 A JP2007065535 A JP 2007065535A JP 2005254454 A JP2005254454 A JP 2005254454A JP 2005254454 A JP2005254454 A JP 2005254454A JP 2007065535 A JP2007065535 A JP 2007065535A
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image formation
image forming
double
paper
recording paper
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Kenichi Hosoi
健一 細井
Shingo Sasami
慎吾 笹見
Minoru Asakawa
稔 浅川
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Konica Minolta Business Technologies Inc
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Konica Minolta Business Technologies Inc
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an image forming method and an image forming apparatus in which the performance of a circulation type conveying means is not wasted. <P>SOLUTION: The image forming apparatus includes a control means for controlling one-surface image formation and both-surface image formation, and the control means includes an alternate conveyance both-surface image formation mode in which back surface image formation for the recording paper reversed from the front surface to the back surface by the circulation type conveying means after feeding the recording paper on whose front surface the image has been formed to the circulation type conveying means at some paper passing intervals for the purpose of alternate conveyance both-surface image formation as the both-surface image formation, and front surface image formation for the recording paper from a paper feeding part are alternately performed by the number of circulation allowable sheets. The retrial of paper feeding that paper is fed again when the feeding of the recording paper is not detected within a predetermined time after starting feeding the paper from the paper feeding means is not performed in the one-surface image formation but performed in the alternate conveyance both-surface image formation mode. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は画像データに基づいて用紙に画像を形成する画像形成方法および画像形成装置に関し、一方の面に画像が形成された用紙を表裏反転してスタックせずに画像形成位置に再給紙して他方の面に画像形成する両面画像形成を実行可能な画像形成方法と画像形成装置とに関する。   The present invention relates to an image forming method and an image forming apparatus for forming an image on a sheet based on image data. The sheet on which an image is formed on one side is reversed and fed again to an image forming position without stacking. The present invention relates to an image forming method and an image forming apparatus capable of executing double-sided image formation for forming an image on the other surface.

画像データに基づいて像担持体上に静電潜像を形成し、その静電潜像を現像剤(トナー)で現像してトナー像を生成し、さらに、生成したトナー像を像担持体から記録紙に転写し、該記録紙と前記像担持体とを分離し、トナー像が載った記録紙を熱と圧力とによって定着することにより画像形成する画像形成装置が、コピー機やファクシミリ装置やプリンタなどで存在している。   An electrostatic latent image is formed on the image carrier based on the image data, the electrostatic latent image is developed with a developer (toner) to generate a toner image, and the generated toner image is further removed from the image carrier. An image forming apparatus that forms an image by transferring to a recording sheet, separating the recording sheet and the image carrier, and fixing the recording sheet on which the toner image is mounted by heat and pressure is a copying machine, a facsimile machine, It exists in printers.

また、一方の面(表面)に画像が形成された記録紙をスタックせずに表裏反転して他方の面(裏面)の画像形成のために画像形成位置に再給紙する循環式搬送手段を両面画像形成の搬送経路に備え、片面画像形成と両面画像形成とを実行可能な画像形成装置も存在している。   Further, there is provided a circulation type conveying means for reversing the recording paper on which the image is formed on one side (front surface) without stacking and refeeding the recording paper to the image forming position for image formation on the other side (back side). There are also image forming apparatuses that can execute single-sided image formation and double-sided image formation in preparation for a conveyance path for double-sided image formation.

ここで、一方の面に画像が形成された記録紙を表裏反転して画像形成位置に再給紙する循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を「循環可能枚数」と呼ぶことができる。   Here, the number of recording sheets that can exist simultaneously on the conveyance path of the circulation type conveying means for reversing the recording sheet with the image formed on one side and refeeding it to the image forming position is referred to as the “circulationable number of sheets”. Can be called.

すなわち、循環可能枚数分の記録紙を循環させつつ両面画像形成を実行することで、通紙間隔を最小限に抑えることができ、画像形成装置の能力を最大限に生かすことが可能になる。   In other words, by performing double-sided image formation while circulating the number of recording sheets that can be circulated, it is possible to minimize the sheet passing interval and to maximize the capability of the image forming apparatus.

ここで、表面画像形成を前記循環可能枚数実行して循環式搬送手段に送り込んだ後に、循環式搬送手段からの記録紙に対して裏面画像形成を循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行して循環式搬送手段に送り込んだ後に、循環式搬送手段からの記録紙に対する裏面画像形成と給紙部からの記録紙に対する表面画像形成とを交互に循環可能枚数実行する交互搬送両面画像形成モードとの、二つの両面画像形成モードが存在している。   Here, a batch transport double-sided image forming mode in which after the front surface image formation is performed and sent to the circulation type conveyance unit, the back side image formation is performed on the recording paper from the circulation type conveyance unit. After forming the front surface image and feeding it to the circulation type conveyance means with a sheet passing interval for the alternate conveyance double-sided image formation, from the back side image formation on the recording paper from the circulation type conveyance means and from the paper feeding unit There are two double-sided image forming modes, ie, an alternating conveyance double-sided image forming mode in which the number of sheets that can be circulated alternately is formed on the surface of the recording paper.

この種の二つの両面画像形成モードの効率的な制御に関して、以下の特許文献1に記載されている。
特開2004−29329号公報(第1頁、図1)
This type of two-sided image forming mode is described in the following Patent Document 1 regarding efficient control.
JP 2004-29329 A (first page, FIG. 1)

このような画像形成装置において、片面画像形成時あるいは一括搬送両面画像形成時の第一給紙の間隔にあわせて、給紙線速が決定されている。このため、高速に画像形成を実行する、いわゆる高速機では給紙線速が高くなっている。このため、第一給紙の部分で給紙不良あるいは給紙ジャムを発生しやすい問題がある。   In such an image forming apparatus, the feeding line speed is determined in accordance with the interval of the first sheet feeding at the time of single-sided image formation or batch transport double-sided image formation. For this reason, a so-called high-speed machine that executes image formation at a high speed has a high feed line speed. For this reason, there is a problem that a paper feed failure or a paper jam is likely to occur in the first paper feed portion.

また、同様に高速機では、片面画像形成時あるいは一括搬送両面画像形成時の第一給紙の間隔を基準に第一給紙ジャム検知時間が定められているため、給紙リトライ(給紙手段から給紙を開始した後に所定時間内に記録紙の送り出しが検知されない場合に給紙を再度実行させる制御)を実行する余裕がない。このため、上述した給紙不良が発生した場合にも回復する手段がなく、一律に給紙ジャムとして扱われるという問題があった。   Similarly, in the high-speed machine, since the first paper jam detection time is determined based on the first paper feed interval at the time of single-sided image formation or batch transport double-sided image formation, paper feed retry (paper feed means) In this case, there is no room for executing the control for re-executing paper feed if no recording paper feed is detected within a predetermined time after the paper feed is started. For this reason, there is no means to recover even when the above-described paper feed failure occurs, and there is a problem that it is treated as a paper feed jam.

そして、両面画像形成について記述された上記引用文献1にも、このような第一給紙部分での不具合については何ら配慮されていなかった。
本発明はこのような課題に鑑みてなされたものであって、循環式搬送手段を備えて交互搬送両面画像形成を実行可能な画像形成装置で効率的かつ確実な画像形成を実行可能な画像形成方法および画像形成装置を提供することを目的としている。
Also, the above cited reference 1 describing the double-sided image formation does not give any consideration to such a problem in the first sheet feeding portion.
SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and is an image forming apparatus that is capable of performing efficient and reliable image formation with an image forming apparatus that is equipped with a circulation-type transport unit and that can perform alternate transport double-sided image formation. It is an object to provide a method and an image forming apparatus.

以上の課題を解決する本発明は以下に述べるようなものである。
なお、本発明の画像形成装置は、一方の面に画像が形成された用紙を表裏反転してスタックせずに画像形成位置に再給紙する循環式搬送手段を両面画像形成の搬送経路に備え、片面画像形成と両面画像形成とを実行可能なものを想定している。
The present invention for solving the above problems is as follows.
The image forming apparatus according to the present invention includes a circulation type conveying unit for conveying a sheet on which an image is formed on one side of the sheet so that the sheet is turned upside down and fed again to the image forming position without being stacked. It is assumed that single-sided image formation and double-sided image formation can be performed.

また、一方の面に画像が形成された用紙を表裏反転して画像形成位置に再給紙する循環式搬送手段の搬送経路上に同時に収納可能な用紙枚数を「循環可能枚数」と呼ぶことにする。   Also, the number of sheets that can be simultaneously stored on the conveyance path of the circulation type conveying means for reversing the sheet on which the image is formed on one side and refeeding the sheet to the image forming position is referred to as “the number of sheets that can be circulated”. To do.

(1)請求項1記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、片面画像形成と両面画像形成とを実行可能な画像形成装置における画像形成方法であって、前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記片面画像形成時には実行せず、前記交互搬送両面画像形成モード時に実行する、ことを特徴とする画像形成方法である。   (1) According to the first aspect of the present invention, the image forming means for forming an image on the recording paper, the paper feeding means for feeding the image forming means, and the recording paper having the image formed on the surface thereof are not stacked. Image formation that can perform single-sided image formation and double-sided image formation, comprising a recirculation type conveying means for reversing the front and back and refeeding to the image forming position for backside image formation and a control means for controlling the image forming operation In the image forming method in the apparatus, as the double-sided image formation, after feeding the recording paper on which the surface image formation is performed in a state where a paper passing interval is provided for the alternate-conveyance double-sided image formation, An alternating conveyance double-sided image forming mode for alternately executing the circulable number of sheets on the back side and the reverse side on the recording sheet reversed by the circulation type conveying unit; Paper hand When the recording paper feed is not detected within a predetermined time after starting the paper feeding, the paper feeding retry for executing the paper feeding again is not executed at the time of the single-sided image formation, but is executed at the time of the alternate transport double-sided image forming mode. This is an image forming method characterized by that.

(2)請求項2記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、両面画像形成を実行可能な画像形成装置における画像形成方法であって、前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記一括搬送両面画像形成モード時には実行せず、前記交互搬送両面画像形成モード時に実行する、ことを特徴とする画像形成方法である。   (2) The invention described in claim 2 is an image forming unit for forming an image on a recording sheet, a sheet feeding unit for feeding the image forming unit, and a recording sheet having an image formed on the surface thereof without stacking. Image forming method in an image forming apparatus capable of performing double-sided image formation, comprising: a recirculation type conveying means for reversing the front and back and refeeding to an image forming position for backside image formation; and a control means for controlling an image forming operation When the number of recording sheets that can exist simultaneously on the conveyance path of the circulation type conveyance unit is set as the number of circulationable sheets, the recording sheet on which surface image formation has been performed is sent to the circulation type conveyance unit. After that, a paper-feeding interval is formed for forming the double-sided image forming mode for executing the backside image formation on the recording paper that is turned upside down by the circulation type conveying unit, and for forming the double-sided image alternately. Surface in condition After the recording paper on which image formation has been performed is sent to the circulation type conveying means, back side image formation on the recording paper that has been turned upside down by the circulation type conveyance means and front side image formation on the recording paper from the paper supply unit are alternately performed. And the two-sided image forming mode of the alternate conveyance double-sided image forming mode for executing the circulable number of sheets, and when the feeding of the recording paper is not detected within a predetermined time after the feeding from the sheet feeding unit is started. In the image forming method, the paper feed retry for executing the paper again is not executed in the batch transport double-sided image formation mode but in the alternate transport double-sided image formation mode.

(3)請求項3記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、片面画像形成と両面画像形成とを実行可能な画像形成装置における画像形成方法であって、前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記片面画像形成時よりも低下させる、ことを特徴とする画像形成方法である。   (3) The invention described in claim 3 is an image forming unit for forming an image on a recording sheet, a sheet feeding unit for feeding the image forming unit, and a recording sheet having an image formed on the surface thereof without stacking. Image formation that can perform single-sided image formation and double-sided image formation, comprising a recirculation type conveying means for reversing the front and back and refeeding to the image forming position for backside image formation and a control means for controlling the image forming operation In the image forming method in the apparatus, as the double-sided image formation, after feeding the recording paper on which the surface image formation is performed in a state where a paper passing interval is provided for the alternate-conveyance double-sided image formation, An alternating conveyance double-sided image forming mode that alternately executes the backside image formation on the recording paper that has been turned upside down by the circulation type conveying means and the front surface image formation on the recording paper from the paper supply unit; Carrying A first sheet feeding speed of the recording paper from the paper feed unit of the double-sided image formation mode, the decrease than during single-sided image formation, it is an image forming method, comprising.

(4)請求項4記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、両面画像形成を実行可能な画像形成装置における画像形成方法であって、前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記一括搬送両面画像形成モード時よりも低下させる、ことを特徴とする画像形成方法である。   (4) According to the invention of claim 4, the image forming means for forming an image on the recording paper, the paper feeding means for feeding the image forming means, and the recording paper with the image formed on the surface thereof are not stacked. Image forming method in an image forming apparatus capable of performing double-sided image formation, comprising: a recirculation type conveying means for reversing the front and back and refeeding to an image forming position for backside image formation; and a control means for controlling an image forming operation When the number of recording sheets that can exist simultaneously on the conveyance path of the circulation type conveyance unit is set as the number of circulationable sheets, the recording sheet on which surface image formation has been performed is sent to the circulation type conveyance unit. After that, a paper-feeding interval is formed for forming the double-sided image forming mode for executing the backside image formation on the recording paper that is turned upside down by the circulation type conveying unit, and for forming the double-sided image alternately. Surface in condition After the recording paper on which image formation has been performed is sent to the circulation type conveying means, back side image formation on the recording paper that has been turned upside down by the circulation type conveyance means and front side image formation on the recording paper from the paper supply unit are alternately performed. And a two-sided image forming mode for executing the circulable number of sheets, and an alternate conveying double-sided image forming mode, wherein the first feeding speed of the recording paper from the sheet feeding means in the alternate conveying double-sided image forming mode is The image forming method is characterized in that the image forming method is lower than that in the batch conveyance duplex image forming mode.

(5)請求項5記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、片面画像形成と両面画像形成とを制御する制御手段とを備え、前記制御手段は、前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記片面画像形成時には実行せず、前記交互搬送両面画像形成モード時に実行する、ことを特徴とする画像形成装置である。   (5) The invention according to claim 5 is an image forming means for forming an image on recording paper, a paper feeding means for feeding the image forming means, and a recording paper having an image formed on the surface thereof without stacking. A reversible conveying unit that reverses the front and back and re-feeds the image to the image forming position for forming a back side image; and a control unit that controls single-sided image formation and double-sided image formation; As described above, after feeding the recording paper on which surface image formation is performed in a state where a sheet passing interval is provided for the alternate conveyance double-sided image formation to the circulation type conveyance unit, the recording sheet is turned upside down by the circulation type conveyance unit. Provided with an alternate conveyance duplex image forming mode in which backside image formation and front side image formation on the recording paper from the paper supply unit are executed alternately, within a predetermined time after starting paper supply from the paper supply means Feeding the recording paper Issued paper feed retry to execute the paper feed when it is not detected again, the not executed at the time of one-side image formation is performed in the alternately conveying the double-sided image forming mode, it is an image forming apparatus according to claim.

(6)請求項6記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、両面画像形成動作を制御する制御手段とを備え、前記制御手段は、前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記一括搬送両面画像形成モード時には実行せず、前記交互搬送両面画像形成モード時に実行する、ことを特徴とする画像形成装置である。   (6) The invention according to claim 6 is an image forming means for forming an image on a recording paper, a paper feeding means for feeding the image forming means, and a recording paper having an image formed on the surface thereof without stacking. A reversing conveyance unit that reverses the front and back and re-feeds the image to the image forming position for forming a back surface image; and a control unit that controls a double-sided image forming operation, the control unit comprising a conveyance path of the recirculation conveyance unit When the number of recording sheets that can exist at the same time is set to the circulable number, the recording sheet on which surface image formation has been performed is sent to the circulatory conveying means, and then turned upside down by the circulatory conveying means. A batch transport double-sided image forming mode for performing backside image formation on the printed recording paper, and a recording paper on which front side image formation has been performed in a state where a sheet passing interval is provided for alternate transport double-sided image formation For circulating transport means An alternate transport duplex image forming mode in which the backside image formation on the recording paper that has been turned upside down by the circulating transport means and the front surface image formation on the recording paper from the paper feeding unit are alternately executed in the circulated number of sheets. The two-sided image forming mode, and when the feeding of the recording paper is not detected within a predetermined time after the feeding from the paper feeding unit is started, the paper feeding retry is executed again for the batch transportation. The image forming apparatus is not executed in the double-sided image forming mode but is executed in the alternate transport double-sided image forming mode.

(7)請求項7記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、片面画像形成と両面画像形成とを制御する制御手段とを備え、前記制御手段は、前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記片面画像形成時よりも低下させる、ことを特徴とする画像形成装置である。   (7) According to the seventh aspect of the present invention, the image forming means for forming an image on the recording paper, the paper feeding means for feeding the image forming means, and the recording paper having the image formed on the surface thereof are not stacked. A reversible conveying unit that reverses the front and back and re-feeds the image to the image forming position for forming a back side image; and a control unit that controls single-sided image formation and double-sided image formation; As described above, after feeding the recording paper on which surface image formation is performed in a state where a sheet passing interval is provided for the alternate conveyance double-sided image formation to the circulation type conveyance unit, the recording sheet is turned upside down by the circulation type conveyance unit. An alternate transport double-sided image forming mode that alternately executes backside image formation and front-side image formation on the recording paper from the paper feed unit from the paper feeding unit in the alternate transport double-sided image formation mode. Recording paper 1 paper feeding speed, the decrease than during single-sided image formation, it is the image forming apparatus according to claim.

(8)請求項8記載の発明は、記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、両面画像形成動作を制御する制御手段とを備え、前記制御手段は、前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記一括搬送両面画像形成モード時よりも低下させる、ことを特徴とする画像形成装置である。   (8) The invention according to claim 8 is an image forming unit for forming an image on a recording sheet, a sheet feeding unit for feeding the image forming unit, and a recording sheet having an image formed on the surface thereof without stacking. A reversing conveyance unit that reverses the front and back and re-feeds the image to the image forming position for forming a back surface image; and a control unit that controls a double-sided image forming operation, the control unit comprising a conveyance path of the recirculation conveyance unit When the number of recording sheets that can exist at the same time is set to the circulable number, the recording sheet on which surface image formation has been performed is sent to the circulatory conveying means, and then turned upside down by the circulatory conveying means. A batch transport double-sided image forming mode for performing backside image formation on the printed recording paper, and a recording paper on which front side image formation has been performed in a state where a sheet passing interval is provided for alternate transport double-sided image formation For circulating transport means An alternate transport duplex image forming mode in which the backside image formation on the recording paper that has been turned upside down by the circulating transport means and the front surface image formation on the recording paper from the paper feeding unit are alternately executed in the circulated number of sheets. The first feeding speed of the recording paper from the paper feeding unit in the alternate transport duplex image forming mode is lower than in the batch transport duplex image forming mode. An image forming apparatus characterized by the above.

この発明によれば、以下のような効果を得ることができる。
(1)請求項1記載の発明では、片面画像形成と両面画像形成とを実行可能であって、両面画像形成として交互搬送両面画像形成モードを備えた画像形成方法において、給紙手段から給紙(第1給紙)を開始した後に所定時間内に記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、通常の第1給紙の間隔である片面画像形成時には実行せず、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時に実行する。
According to the present invention, the following effects can be obtained.
(1) According to the first aspect of the present invention, in the image forming method capable of executing single-sided image formation and double-sided image formation and having an alternate conveyance double-sided image formation mode as double-sided image formation, paper is fed from a paper feed means. If a recording paper feed is not detected within a predetermined time after the start of (first paper feed), a paper feed retry is executed when a single-sided image is formed, which is a normal first paper feed interval. First, it is executed in the alternate conveyance double-sided image forming mode in which the interval of the first sheet feeding is twice the normal interval.

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、給紙リトライを実行することにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by executing the paper feed retry in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. As a result, an image forming apparatus equipped with a circulation type conveying unit and capable of performing alternate conveyance double-sided image formation is reliable and efficiently improved without reducing productivity in the alternate conveyance double-sided image formation mode. Image formation can be performed.

(2)請求項2記載の発明では、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段を備え、一括搬送両面画像形成モードと交互搬送両面画像形成モードとの二つの両面画像形成モードで両面画像形成を実行可能な画像形成方法において、給紙手段から給紙(第1給紙)を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、通常の第1給紙の間隔である一括搬送両面画像形成モード時には実行せず、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時に実行する。   (2) According to the invention of claim 2, there is provided a circulation type conveying means for reversing the front and back without restacking the recording paper on which the image is formed on the front surface and refeeding it to the image forming position for the back side image formation, In an image forming method capable of executing double-sided image formation in two double-sided image forming modes of a batch transport double-sided image forming mode and an alternating transport double-sided image forming mode, after feeding from the paper feeding unit (first paper feeding) is started When the recording paper is not fed out within a predetermined time, a paper feed retry for executing paper feeding again is not executed in the batch conveyance double-sided image forming mode, which is a normal first paper feeding interval, and the first paper feeding is performed. This is executed in the alternate conveyance double-sided image forming mode in which the interval is twice the normal interval.

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、給紙リトライを実行することにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて一括搬送両面画像形成と交互搬送両面画像形成とを実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by executing the paper feed retry in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. As a result, an image forming apparatus equipped with a circulation type conveying means and capable of carrying out batch conveyance double-sided image formation and alternate conveyance double-sided image formation can efficiently and reliably reduce productivity in the alternate conveyance double-sided image formation mode. Reliable image formation can be executed in an improved state.

(3)請求項3記載の発明では、片面画像形成と両面画像形成とを実行可能であって、両面画像形成として交互搬送両面画像形成モードを備えた画像形成方法において、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、通常の第1給紙の間隔である片面画像形成時よりも低下させる。   (3) In the invention according to claim 3, in the image forming method capable of executing single-sided image formation and double-sided image formation and having an alternate conveyance double-sided image formation mode as double-sided image formation, the interval between the first paper feeds The first feeding speed of the recording paper from the paper feeding unit in the alternate conveyance double-sided image forming mode in which the interval is twice the normal interval is lower than that in the single-sided image forming which is the normal first feeding interval. .

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、第1給紙速度を低下させることにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by reducing the first paper feed speed in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. . As a result, an image forming apparatus equipped with a circulation type conveying unit and capable of performing alternate conveyance double-sided image formation is reliable and efficiently improved without reducing productivity in the alternate conveyance double-sided image formation mode. Image formation can be performed.

(4)請求項4記載の発明では、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段を備え、一括搬送両面画像形成モードと交互搬送両面画像形成モードとの二つの両面画像形成モードで両面画像形成を実行可能な画像形成方法において、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、通常の第1給紙の間隔である一括搬送両面画像形成時よりも低下させる。   (4) According to the invention of claim 4, there is provided a circulation type conveying means for reversing the front and back without feeding the recording paper on which the image is formed on the front surface and refeeding it to the image forming position for the backside image formation, In an image forming method capable of performing double-sided image formation in two double-sided image forming modes of a batch transport double-sided image forming mode and an alternating transport double-sided image forming mode, the first paper feeding interval is alternately doubled as usual. The first sheet feeding speed of the recording sheet from the sheet feeding unit in the conveyance double-sided image formation mode is made lower than that in the case of batch conveyance double-sided image formation, which is the normal first sheet feeding interval.

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、第1給紙速度を低下させることにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by reducing the first paper feed speed in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. . As a result, an image forming apparatus equipped with a circulation type conveying unit and capable of performing alternate conveyance double-sided image formation is reliable and efficiently improved without reducing productivity in the alternate conveyance double-sided image formation mode. Image formation can be performed.

(5)請求項5記載の発明では、片面画像形成と両面画像形成とを実行可能であって、両面画像形成として交互搬送両面画像形成モードを備えた画像形成装置において、給紙手段から給紙(第1給紙)を開始した後に所定時間内に記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、通常の第1給紙の間隔である片面画像形成時には実行せず、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時に実行する。   (5) In the invention according to claim 5, in the image forming apparatus capable of executing single-sided image formation and double-sided image formation and having an alternate conveyance double-sided image formation mode as double-sided image formation, paper is fed from a paper feed unit. If a recording paper feed is not detected within a predetermined time after the start of (first paper feed), a paper feed retry is executed when a single-sided image is formed, which is a normal first paper feed interval. First, it is executed in the alternate conveyance double-sided image forming mode in which the interval of the first sheet feeding is twice the normal interval.

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、給紙リトライを実行することにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by executing the paper feed retry in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. As a result, an image forming apparatus equipped with a circulation type conveying unit and capable of performing alternate conveyance double-sided image formation is reliable and efficiently improved without reducing productivity in the alternate conveyance double-sided image formation mode. Image formation can be performed.

(6)請求項6記載の発明では、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段を備え、一括搬送両面画像形成モードと交互搬送両面画像形成モードとの二つの両面画像形成モードで両面画像形成を実行可能な画像形成装置において、給紙手段から給紙(第1給紙)を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、通常の第1給紙の間隔である一括搬送両面画像形成モード時には実行せず、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時に実行する。   (6) In the invention according to claim 6, the recording paper having an image formed on the front surface thereof is provided with a circulation type conveying means for reversing the front and back without restacking and refeeding the recording paper to the image forming position for forming the back surface image. In an image forming apparatus capable of performing double-sided image formation in two double-sided image forming modes of a batch transport double-sided image forming mode and an alternating transport double-sided image forming mode, after feeding from the paper feeding unit (first paper feeding) is started When the recording paper is not fed out within a predetermined time, a paper feed retry for executing paper feeding again is not executed in the batch conveyance double-sided image forming mode, which is a normal first paper feeding interval, and the first paper feeding is performed. This is executed in the alternate conveyance double-sided image forming mode in which the interval is twice the normal interval.

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、給紙リトライを実行することにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて一括搬送両面画像形成と交互搬送両面画像形成とを実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by executing the paper feed retry in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. As a result, an image forming apparatus equipped with a circulation type conveying means and capable of carrying out batch conveyance double-sided image formation and alternate conveyance double-sided image formation can efficiently and reliably reduce productivity in the alternate conveyance double-sided image formation mode. Reliable image formation can be executed in an improved state.

(7)請求項7記載の発明では、片面画像形成と両面画像形成とを実行可能であって、両面画像形成として交互搬送両面画像形成モードを備えた画像形成装置において、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、通常の第1給紙の間隔である片面画像形成時よりも低下させる。   (7) In the invention according to claim 7, in the image forming apparatus capable of executing single-sided image formation and double-sided image formation and having an alternate conveyance double-sided image formation mode as double-sided image formation, the interval between the first paper feeds The first feeding speed of the recording paper from the paper feeding unit in the alternate conveyance double-sided image forming mode in which the interval is twice the normal interval is lower than that in the single-sided image forming which is the normal first feeding interval. .

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、第1給紙速度を低下させることにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by reducing the first paper feed speed in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. . As a result, an image forming apparatus equipped with a circulation type conveying unit and capable of performing alternate conveyance double-sided image formation is reliable and efficiently improved without reducing productivity in the alternate conveyance double-sided image formation mode. Image formation can be performed.

(8)請求項8記載の発明では、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段を備え、一括搬送両面画像形成モードと交互搬送両面画像形成モードとの二つの両面画像形成モードで両面画像形成を実行可能な画像形成装置において、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、通常の第1給紙の間隔である一括搬送両面画像形成時よりも低下させる。   (8) In the invention described in claim 8, the recording paper having the image formed on the front surface thereof is provided with a circulation type conveying means for reversing the front and back without restacking and refeeding the recording paper to the image forming position for forming the back surface image. In an image forming apparatus capable of performing double-sided image formation in two double-sided image forming modes of batch transport double-sided image forming mode and alternating transport double-sided image forming mode, the first paper feeding interval is alternately doubled as usual. The first sheet feeding speed of the recording sheet from the sheet feeding unit in the conveyance double-sided image formation mode is made lower than that in the case of batch conveyance double-sided image formation, which is the normal first sheet feeding interval.

すなわち、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、第1給紙速度を低下させることにより時間的余裕を有効に活用する。この結果、循環式搬送手段を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, the time margin is effectively utilized by reducing the first paper feed speed in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. . As a result, an image forming apparatus equipped with a circulation type conveying unit and capable of performing alternate conveyance double-sided image formation is reliable and efficiently improved without reducing productivity in the alternate conveyance double-sided image formation mode. Image formation can be performed.

以下、図面を参照して本発明の実施をするための最良の形態(実施形態)を詳細に説明する。なお、以下、画像形成装置の構成および動作について実施形態の説明をするが、画像形成装置の動作が画像形成方法となっている。   The best mode (embodiment) for carrying out the present invention will be described below in detail with reference to the drawings. Hereinafter, the configuration and operation of the image forming apparatus will be described. However, the operation of the image forming apparatus is an image forming method.

〈画像形成装置の電気的構成〉
以下、図面を参照して本発明の実施形態を詳細に説明する。図1は本発明の実施形態の画像形成装置100の電気的な主要部分の構成図である。ここでは、画像形成装置100として、画像読み取り部とプリントエンジンとを備えた複写機を具体例にする。
<Electrical configuration of image forming apparatus>
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of an electrical main part of an image forming apparatus 100 according to an embodiment of the present invention. Here, a specific example of the image forming apparatus 100 is a copying machine including an image reading unit and a print engine.

100は記録紙に画像形成して出力する各種の画像形成装置であり、各種制御を行う制御部101と、操作入力を受けると共に状態表示を行う操作表示部105と、各種データやパラメータを保存している不揮発性メモリ110と、外部機器や外部ネットワークとの通信を司るインタフェース120と、原稿の画像を読み取って画像データを生成する画像読み取り手段としてのスキャナ部130と、画像処理を実行する画像処理部140と、画像処理部140内に設けられた画像メモリ150と、記録紙上に画像形成を行う画像形成手段としてのプリントエンジン160と、を有して構成されている。   Reference numeral 100 denotes various image forming apparatuses that form images on recording paper and output them. The control unit 101 performs various controls, the operation display unit 105 receives operation input and displays a status, and stores various data and parameters. A non-volatile memory 110, an interface 120 that controls communication with an external device or an external network, a scanner unit 130 as an image reading unit that reads an image of a document and generates image data, and image processing that executes image processing , And an image memory 150 provided in the image processing unit 140, and a print engine 160 as image forming means for forming an image on recording paper.

また、この図1において、101は画像形成装置100の各部を制御する制御部であり、本実施形態においては画像形成の際の各種制御を行うものであり、特に、記録紙の給紙制御を行う。   In FIG. 1, reference numeral 101 denotes a control unit that controls each unit of the image forming apparatus 100. In this embodiment, the control unit 101 performs various types of control during image formation. Do.

なお、本実施形態では、片面画像形成と両面画像形成とを制御する制御手段としての制御部101とを備え、制御部101は、両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と給紙部からの記録紙に対する表面画像形成とを交互に循環可能枚数実行する「交互搬送両面画像形成モード」を備え、給紙手段から給紙を開始した後に所定時間内に記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、片面画像形成時には実行せず、交互搬送両面画像形成モード時に実行する。   In the present exemplary embodiment, the control unit 101 is provided as a control unit that controls single-sided image formation and double-sided image formation. After the recording paper on which surface image formation has been performed with the gap opened is fed to the circulation type conveying means, the back side image formation is performed on the recording sheet that is turned upside down by the circulation type conveyance means, and the surface image formation is performed on the recording sheet from the paper feeding unit The “alternate transport double-sided image formation mode” that alternately executes the number of sheets that can be circulated is provided so that if feeding of recording paper is not detected within a predetermined time after feeding from the paper feeding means, feeding is performed again. The paper retry is not executed at the time of single-sided image formation, but is executed at the time of the alternate conveyance double-sided image formation mode.

また、本実施形態では、両面画像形成動作を制御する制御手段としての制御部101とを備え、制御部101は、循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を循環可能枚数実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を循環可能枚数実行する「一括搬送両面画像形成モード」と、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と給紙部からの記録紙に対する表面画像形成とを交互に循環可能枚数実行する「交互搬送両面画像形成モード」との二つの両面画像形成モードを備え、給紙手段から給紙を開始した後に所定時間内に記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、一括搬送両面画像形成モード時には実行せず、交互搬送両面画像形成モード時に実行する。   In this embodiment, the control unit 101 is also provided as a control unit that controls the double-sided image forming operation. The control unit 101 can circulate the number of sheets of recording paper that can exist simultaneously on the conveyance path of the circulation type conveyance unit. In this case, after the recording paper on which the front surface image formation has been circulated is sent to the circulation type conveyance means, the back surface image formation is executed on the recording paper that has been turned upside down by the circulation type conveyance means. `` Batch transport duplex image formation mode '' and recording paper on which surface image formation has been performed with an interval between two sheets for alternate transport double-sided image formation is sent to the circulation transport means, and then the front and back are reversed by the circulation transport means Two-sided image forming mode, “Alternate transport double-sided image forming mode”, which executes back-side image formation on the printed recording paper and front-side image formation on the recording paper from the paper feeding unit alternately In the case of batch transport double-sided image formation mode, the paper feed retry is not executed in the batch transport double-sided image formation mode when the recording paper delivery is not detected within a predetermined time after the paper feed means starts feeding. Executed in the image forming mode.

また、本実施形態では、片面画像形成と両面画像形成とを制御する制御手段としての制御部101とを備え、制御部101は、両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と給紙部からの記録紙に対する表面画像形成とを交互に循環可能枚数実行する交互搬送両面画像形成モードを備え、交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、片面画像形成時よりも低下させる。   In the present embodiment, the control unit 101 is also provided as a control unit that controls single-sided image formation and double-sided image formation. After the recording paper on which surface image formation has been performed with the gap opened is fed to the circulation type conveying means, the back side image formation is performed on the recording sheet that is turned upside down by the circulation type conveyance means, and the surface image formation is performed on the recording sheet from the paper feeding unit. And an alternate transport double-sided image forming mode in which the number of sheets that can be circulated alternately is provided, and the first paper feed speed of the recording paper from the paper feed means in the alternate transport double-sided image formation mode is lower than that during single-sided image formation.

また、本実施形態では、両面画像形成動作を制御する制御手段としての制御部101とを備え、制御部101は、循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を循環可能枚数実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と給紙部からの記録紙に対する表面画像形成とを交互に循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、一括搬送両面画像形成モード時よりも低下させる。   In this embodiment, the control unit 101 is also provided as a control unit that controls the double-sided image forming operation. The control unit 101 can circulate the number of sheets of recording paper that can exist simultaneously on the conveyance path of the circulation type conveyance unit. In this case, after the recording paper on which the front surface image formation is circulated is sent to the circulation type conveyance means, the back side image formation is executed on the recording paper that has been turned upside down by the circulation type conveyance means. After feeding the recording paper on which surface image formation was performed with the conveyance duplex image forming mode and the alternate conveyance duplex image formation with a sheet passing interval being fed to the circulation type conveyance means, the paper was turned upside down by the circulation type conveyance means It has two double-sided image formation modes, an alternating conveyance double-sided image formation mode that alternately executes the number of sheets that can be circulated between the back side image formation on the recording paper and the front side image formation on the recording paper from the paper feed unit, A first sheet feeding speed of the recording paper from the paper feed means 互搬 feed double-sided image forming mode, it is lower than when the bundle conveyance double-sided image forming mode.

そして、プリントエンジン160は、それぞれの搬送経路を通過させることで片面画像形成と両面画像形成とを実行可能であり、片面画像形成搬送経路160aと、両面画像形成搬送経路160bとを備えている。そして、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段を両面画像形成搬送経路160bに備えている。   The print engine 160 can perform single-sided image formation and double-sided image formation by passing through the respective conveyance paths, and includes a single-sided image formation conveyance path 160a and a double-sided image formation conveyance path 160b. The double-sided image forming and conveying path 160b is provided with a circulation type conveying means for reversing the recording paper on which the image is formed on the front surface without stacking and re-feeding the recording paper to the image forming position for forming the back image.

また、プリントエンジン160は、循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を循環可能枚数実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を循環式搬送手段に送り込んだ後に、循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と給紙部からの記録紙に対する表面画像形成とを交互に循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードとを実行可能である。   Further, the print engine 160 sends the recording paper on which the surface image formation has been performed to the circulation type conveyance unit when the number of sheets that can exist simultaneously on the conveyance path of the circulation type conveyance unit is set to the circulation type. After that, in a batch transport double-sided image formation mode in which the number of backside images can be circulated on the recording paper that has been turned upside down by the circulation type transport means, and with a sheet passing interval for alternate transport double-sided image formation After the recording paper on which the front side image formation has been performed is sent to the circulation type conveyance unit, the back side image formation for the recording sheet reversed by the circulation type conveyance unit and the front side image formation for the recording sheet from the paper feeding unit are alternately circulated. It is possible to execute two double-sided image forming modes including an alternate conveyance double-sided image forming mode for executing the possible number of sheets.

また、この画像形成装置100は、複写機、ファクシミリ装置、プリンタなどの各種の装置が該当する。また、プリントエンジン160は、レーザビームを用いる電子写真方式のもののほか、LEDプリントヘッドを用いるものや、インクジェット方式のものでもよい。   The image forming apparatus 100 corresponds to various apparatuses such as a copying machine, a facsimile apparatus, and a printer. The print engine 160 may be an electrophotographic type using a laser beam, an LED print head, or an inkjet type.

〈画像形成装置の機械的構成〉
また、図2は本実施形態の画像形成装置のプリントエンジン160を電子写真方式で構成した場合の機械的構成を示す構成図である。
<Mechanical configuration of image forming apparatus>
FIG. 2 is a configuration diagram showing a mechanical configuration when the print engine 160 of the image forming apparatus of this embodiment is configured by an electrophotographic system.

この図2において、10は自動原稿給送手段(以下、ADFと言う)であり、原稿の両面を読み取るための給紙を行う手段である。20は原稿を光学的にスキャンして読み取って画像データを生成する画像読み取り部(スキャナ部)である。40は画像データに応じた露光用光ビームを生成する画像書き込み部である。50は画像データを静電方式により記録媒体(転写紙あるいは記録紙と言うが、本願明細書では、記録紙という)p上に記録する画像形成部である。60は記録紙の搬送を行う搬送手段である。   In FIG. 2, reference numeral 10 denotes an automatic document feeding means (hereinafter referred to as ADF), which is a means for feeding paper for reading both sides of a document. Reference numeral 20 denotes an image reading unit (scanner unit) that optically scans and reads a document to generate image data. An image writing unit 40 generates an exposure light beam corresponding to the image data. Reference numeral 50 denotes an image forming unit that records image data on a recording medium (referred to as recording paper or recording paper in this specification) p by electrostatic method. Reference numeral 60 denotes a conveying means for conveying the recording paper.

ここで、原稿の両面給送が可能なADF10の原稿載置部11には、原稿第1頁の表面を上にした状態の原稿dが複数枚載置されている。ローラ12a、ローラ12bを介して繰り出された原稿の1枚目はローラ13を介して回転される。   Here, a plurality of documents d with the surface of the first page of the document facing up are placed on the document placement portion 11 of the ADF 10 capable of feeding both sides of the document. The first sheet of the document fed out through the rollers 12 a and 12 b is rotated through the roller 13.

この時、光源23により原稿dの原稿面が照射され、その反射光がミラー24,25,26を介して結像光学系27を介して光電変換手段であるCCD28の受光面に像を結ぶ。ここで、光源23、ミラー24,25,26、結像光学系27及びCCD28を有する光学系、並びに、図示されていない光学系駆動手段とで画像読み取り部20を構成している。   At this time, the original surface of the original d is irradiated by the light source 23, and the reflected light forms an image on the light receiving surface of the CCD 28 which is a photoelectric conversion means via the imaging optical system 27 via the mirrors 24, 25 and 26. Here, the light source 23, the mirrors 24, 25, and 26, the optical system having the imaging optical system 27 and the CCD 28, and the optical system driving means (not shown) constitute the image reading unit 20.

この図において、原稿dがプラテンガラス21上に読み取り面を下に向けた状態に載置された場合には、光学系はプラテンガラス21に沿って走査して読み取りを行う。
また、原稿dが自動給紙されてローラ13の周囲を回る場合には、第2のプラテンガラス22下に光源23とミラー24とが固定された状態で読み取りを行う。そして、読み取られた原稿dの画像データは、CCD28から図示しない読み取り画像処理部に送られる。
In this figure, when an original d is placed on the platen glass 21 with the reading surface facing downward, the optical system scans along the platen glass 21 to perform reading.
When the document d is automatically fed and rotates around the roller 13, the reading is performed with the light source 23 and the mirror 24 fixed under the second platen glass 22. The read image data of the document d is sent from the CCD 28 to a read image processing unit (not shown).

なお、原稿dがADF10により自動給送される場合には、原稿dの1ページ目が読み取られると、今度は反転ローラ14を介して再度ローラ13を用いた巻き取り操作が行われ、原稿裏面の画像が画像読み取り部20で読み取られ、読み取り画像処理部に送られる。   In the case where the document d is automatically fed by the ADF 10, when the first page of the document d is read, the winding operation using the roller 13 is performed again through the reversing roller 14, and the back side of the document d. Are read by the image reading unit 20 and sent to the read image processing unit.

このようにして、表面と裏面との画像が読み取られた原稿dは、再度反転ローラ14で反転されて、表面を下に向けた状態で排紙皿16に積載されていく。
このようにして画像読み取り部20で読み取られた画像データは、読み取り画像処理部で所定の画像処理が行なわれた後、圧縮伸長回路で圧縮されて画像記憶部に記憶される。
In this way, the original d from which the images on the front and back surfaces have been read is reversed again by the reversing roller 14 and stacked on the paper discharge tray 16 with the front surface facing downward.
The image data read by the image reading unit 20 in this manner is subjected to predetermined image processing by the read image processing unit, and then compressed by a compression / decompression circuit and stored in the image storage unit.

一方、記録紙pが積載されている給紙トレイ30a〜30cのいずれかから、第1給紙ローラ31a〜31cにより記録紙pが繰り出され、画像形成部50に給送される。
画像形成部50に給送される記録紙pは、その入口付近の第2給紙ローラ(レジストローラ)32で同期がとられた後、像担持体となる感光体ドラム51に近接する。
On the other hand, the recording paper p is fed out from any of the paper feeding trays 30 a to 30 c on which the recording paper p is stacked by the first paper feeding rollers 31 a to 31 c and fed to the image forming unit 50.
The recording paper p fed to the image forming unit 50 is synchronized with a second paper feeding roller (registration roller) 32 near the entrance thereof, and then approaches a photosensitive drum 51 serving as an image carrier.

記録画像処理部から画像書き込み部40に画像データが入力され、画像書込み部40内のレーザダイオードから画像データに応じたレーザ光を感光体ドラム51上に照射し、静電潜像を形成する。この静電潜像を現像部53で現像することで、感光体ドラム51上にトナー像を形成する。   Image data is input from the recorded image processing unit to the image writing unit 40, and a laser beam corresponding to the image data is irradiated onto the photosensitive drum 51 from a laser diode in the image writing unit 40 to form an electrostatic latent image. The electrostatic latent image is developed by the developing unit 53 to form a toner image on the photosensitive drum 51.

このトナー像は感光体ドラム51の下部の転写部54により記録紙pに転写される。そして、感光体ドラム51に圧着されている記録紙pは分離部55により分離される。感光体ドラム51から分離された記録紙pは搬送機構58を介して定着部59に入り、トナー像が熱と圧力とにより定着される。このようにして、記録紙pに画像が形成される。   This toner image is transferred to the recording paper p by the transfer portion 54 below the photosensitive drum 51. Then, the recording paper p that is pressure-bonded to the photosensitive drum 51 is separated by the separation unit 55. The recording paper p separated from the photosensitive drum 51 enters the fixing unit 59 via the transport mechanism 58, and the toner image is fixed by heat and pressure. In this way, an image is formed on the recording paper p.

なお、必要に応じて、トナー像が定着された記録紙pは、ガイド61を介して下方に搬送され、反転部63に入る。そして、片面画像形成であれば、一方の面の画像形成が完了した記録紙pは排紙ローラ65を介して排出される。   If necessary, the recording paper p on which the toner image is fixed is conveyed downward through the guide 61 and enters the reversing unit 63. In the case of single-sided image formation, the recording paper p on which image formation on one side has been completed is discharged via the paper discharge roller 65.

また、両面画像形成であれば、反転部63に入っている記録紙pは、反転ローラにより再度繰り出され、反転搬送路64を経由して再度画像形成部50に送られる。前記原稿dの片面の画像形成が終了した画像形成部50では、感光体ドラム51に付着したトナーがクリーニング部56で除去され、続く帯電部52により帯電させられ、次の画像形成に備えている。   In the case of double-sided image formation, the recording paper p contained in the reversing unit 63 is again fed out by the reversing roller, and is sent again to the image forming unit 50 via the reversing conveyance path 64. In the image forming unit 50 where the image formation on one side of the original d has been completed, the toner adhering to the photosensitive drum 51 is removed by the cleaning unit 56 and charged by the subsequent charging unit 52 to prepare for the next image formation. .

この状態で記録紙pのもう一方の面(未だ画像形成されていない面)が画像形成部50に搬入され、画像が形成される。分離部55で感光体ドラム51から分離された記録紙pは搬送機構58を介して再度定着部59に入って定着される。このようにして、裏面と表面との画像形成が完了した記録紙p、または、一方の面の画像形成が完了した記録紙pは排紙ローラ65を介して排出される。   In this state, the other side of the recording paper p (the side on which no image is formed yet) is carried into the image forming unit 50 to form an image. The recording paper p separated from the photosensitive drum 51 by the separation unit 55 enters the fixing unit 59 again through the transport mechanism 58 and is fixed. In this way, the recording paper p on which image formation on the back surface and the front surface is completed, or the recording paper p on which image formation on one surface is completed is discharged via the paper discharge roller 65.

図3は片面画像形成時と両面画像形成時の通紙状態を示す説明図である。ここでは、図2の説明図に含まれる搬送経路を抽出し、模式的に示している。ここで、太実線が片面画像形成と両面画像形成とを合わせた搬送経路を示している。   FIG. 3 is an explanatory diagram showing a sheet passing state during single-sided image formation and double-sided image formation. Here, the conveyance path included in the explanatory diagram of FIG. 2 is extracted and schematically shown. Here, a thick solid line indicates a conveyance path combining single-sided image formation and double-sided image formation.

ここで、第1給紙ローラ31の搬送方向直後に第1給紙センサ31sが配置されており、記録紙が第1給紙されたか否かを検知する。また、レジストローラ32近傍にはレジストセンサ32sが配置されており、記録紙が第2給紙可能な状態かを検知する。   Here, a first paper feed sensor 31s is arranged immediately after the first paper feed roller 31 in the transport direction, and detects whether or not the recording paper has been fed first. Also, a registration sensor 32s is disposed in the vicinity of the registration roller 32, and detects whether or not the recording paper can be fed in the second paper.

また、レジストセンサ32sで記録紙を検知したことを起点として、予め設定されいるループ量を確保するための時間をおいてから、ループ形成ローラを駆動するループモータを停止させる。このとき、レジストローラ32に記録紙を突き当て、記録紙の先端を撓ませてループ形成する。なお、レジストローラ32はレジストモータ、ループ形成ローラ33はループモータでそれぞれ駆動されており、ループ形成中か否かはループモータのオン・オフで判断している。   In addition, starting from the detection of the recording paper by the registration sensor 32s, a loop motor for driving the loop forming roller is stopped after a time for securing a preset loop amount. At this time, the recording paper is abutted against the registration roller 32, and the leading end of the recording paper is bent to form a loop. The registration roller 32 is driven by a registration motor, and the loop forming roller 33 is driven by a loop motor, and whether or not the loop is being formed is determined by whether the loop motor is on or off.

また、一点鎖線が片面画像形成搬送経路(図3(A))を示しており、記録紙の一方の面に片面画像形成(図3(a1))がなされる。この場合、図外の給紙トレイ30a〜30c(図2参照)から第1給紙制御によって制御された第1給紙ローラ31a〜31cによって送り出された記録紙が、第2給紙制御によって制御された第2給紙ローラ32により所定のタイミングで画像形成(転写)位置に送り出され、感光体ドラム51のトナー像が記録紙に転写される。その後、定着部59で熱定着され、反転部63で反転されてから機外に排出される。   A one-dot chain line indicates a single-sided image forming conveyance path (FIG. 3A), and single-sided image formation (FIG. 3A1) is performed on one surface of the recording paper. In this case, the recording paper fed by the first paper feed rollers 31a to 31c controlled by the first paper feed control from the paper feed trays 30a to 30c (see FIG. 2) (not shown) is controlled by the second paper feed control. The second paper feed roller 32 is sent to an image forming (transfer) position at a predetermined timing, and the toner image on the photosensitive drum 51 is transferred to the recording paper. Thereafter, the heat is fixed by the fixing unit 59, reversed by the reversing unit 63, and then discharged outside the apparatus.

また、二点鎖線が両面画像形成搬送経路(図3(B))を示しており、記録紙の一方の面に両面画像形成の第一面(図3(b1))がなされ、記録紙の他方の面に両面画像形成の第二面(図3(b2))がなされる。この場合、図外の給紙トレイ30a〜30c(図2参照)から第1給紙制御によって制御された第1給紙ローラ31a〜31cによって送り出された記録紙が、第2給紙制御によって制御された第2給紙ローラ32により所定のタイミングで画像形成(転写)位置に送り出され、感光体ドラム51のトナー像が記録紙の第一面に転写される。その後、定着部59で熱定着され、反転搬送路64でスタックせずに反転された記録紙は、再び第2給紙制御によって制御された第2給紙ローラ32により所定のタイミングで画像形成(転写)位置に送り出され、感光体ドラム51のトナー像が記録紙の第二面に転写される。その後、定着部59で熱定着され、機外に排出される。   A two-dot chain line indicates a double-sided image forming conveyance path (FIG. 3B), and a first side (FIG. 3B1) of double-sided image formation is formed on one side of the recording paper. The second side of the double-sided image formation (FIG. 3 (b2)) is made on the other side. In this case, the recording paper fed by the first paper feed rollers 31a to 31c controlled by the first paper feed control from the paper feed trays 30a to 30c (see FIG. 2) (not shown) is controlled by the second paper feed control. The second paper feed roller 32 is sent to an image forming (transfer) position at a predetermined timing, and the toner image on the photosensitive drum 51 is transferred to the first surface of the recording paper. Thereafter, the recording paper that has been heat-fixed by the fixing unit 59 and reversed without being stacked in the reversing conveyance path 64 is formed again at a predetermined timing by the second paper feed roller 32 controlled by the second paper feed control ( The toner image on the photosensitive drum 51 is transferred to the second surface of the recording paper. Thereafter, the image is heat-fixed by the fixing unit 59 and discharged outside the apparatus.

図4は本願発明の第一の実施形態の動作状態を示すフローチャートである。ここでは、制御部101が交互搬送両面画像形成モード時に本実施形態の特徴となる制御を実行する際の処理手順を示している。   FIG. 4 is a flowchart showing the operating state of the first embodiment of the present invention. Here, a processing procedure when the control unit 101 executes control that is a feature of the present embodiment in the alternate conveyance double-sided image forming mode is shown.

なお、以下の実施の形態例の動作説明では、制御部101と画像形成用各種プログラムによる各種の制御や各種の動作を、単に制御部101の制御という言い方によって説明する。   In the following description of the operation of the embodiment, various controls and various operations by the control unit 101 and various image forming programs will be described simply by the control unit 101 control.

制御部101は、操作部からのコピーの指示あるいは外部機器からの画像データによるプリント要求があった場合には、これから画像形成を実行しようとする記録紙について、以下の制御を実行する。   When there is a copy instruction from the operation unit or a print request based on image data from an external device, the control unit 101 executes the following control for a recording sheet on which image formation is to be performed.

まず、制御部101は、プリント要求があったジョブについて、指定された記録紙が収容されている給紙トレイから第1給紙を実行するよう制御する(図4S1)。すなわち、制御部101の指示により、図示されていない給紙モータをON状態にし、図示されない給紙クラッチをONにすることで、第1給紙ローラ31を駆動して、給紙トレイから記録紙を搬送経路に向けて送り出す。   First, the control unit 101 performs control so that the first paper feed is executed from the paper feed tray in which the designated recording paper is stored for a job for which a print request has been made (S1 in FIG. 4). That is, in response to an instruction from the control unit 101, a sheet feeding motor (not shown) is turned on, and a sheet feeding clutch (not shown) is turned on to drive the first sheet feeding roller 31 so that the recording sheet is fed from the sheet feeding tray. Is sent out toward the transport path.

以上の第1給紙を実行した後、記録紙が第1給紙により搬送されているかを第1給紙センサ31sにて検知する(図4S2)。記録紙が第1給紙により搬送されていると第1給紙センサ31sにて検知された場合(図4S2でY)、第1給紙により搬送されている記録紙が第2給紙ローラ32近傍まで搬送されているかをレジストセンサ32sにて検知する(図4S3)。記録紙が第2給紙ローラ32近傍まで搬送されているとレジストセンサ32sにて検知された場合(図4S3でY)、さらに、ループ形成ローラを駆動しているループモータによって記録紙のループが形成されたかを検知する(図4S4)。   After executing the first paper feed described above, the first paper feed sensor 31s detects whether the recording paper is being conveyed by the first paper feed (S2 in FIG. 4). When the first paper feed sensor 31s detects that the recording paper is being conveyed by the first paper feed (Y in FIG. 4), the recording paper being conveyed by the first paper feed is the second paper feed roller 32. It is detected by the registration sensor 32s whether it is being conveyed to the vicinity (S3 in FIG. 4). When the registration sensor 32s detects that the recording paper is being conveyed to the vicinity of the second paper feeding roller 32 (Y in FIG. 4), the loop of the recording paper is further caused by the loop motor driving the loop forming roller. It is detected whether it has been formed (S4 in FIG. 4).

給紙された記録紙が1枚目記録紙であれば(図4S5でY)、制御部101は、第2給紙ローラ32を駆動して第2給紙をスタートさせ(図4S7)、記録紙を感光体ドラム51に向けて送り出す。そして、次の第2給紙のインターバル時間をタイマにセットする(図4S8)。   If the fed recording paper is the first recording paper (Y in FIG. 4 S5), the control unit 101 drives the second paper feeding roller 32 to start the second paper feeding (S7 in FIG. 4), and the recording. The paper is sent out toward the photosensitive drum 51. Then, the next second paper feeding interval time is set in the timer (S8 in FIG. 4).

また、給紙された記録紙が1枚目記録紙でなければ(図4S5でN)、制御部101は、所定のインターバル時間を待ってから(図4S6)第2給紙ローラ32を駆動して第2給紙をスタートさせ、記録紙を感光体ドラム51に向けて送り出す。そして、次の第2給紙のインターバル時間をタイマにセットする(図4S7)。   If the fed recording paper is not the first recording paper (N in FIG. 4S5), the control unit 101 waits for a predetermined interval time (FIG. 4S6) and drives the second paper feeding roller 32. Then, the second paper feeding is started, and the recording paper is sent out toward the photosensitive drum 51. Then, the next second paper feed interval time is set in the timer (S7 in FIG. 4).

ここで、第2給紙のインターバル時間としては、図5(b)(c)に示すように、片面画像形成時と一括搬送両面画像形成時とでは、変化せずにtとなっている。
一方、図5(a)に示すように、交互搬送両面画像形成時には、2t、t、2tと変化する。すなわち、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成のみを実行した記録紙を循環式搬送手段に送り込む期間では、第2給紙インターバル時間は2tである。そして、循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と給紙部からの記録紙に対する表面画像形成とを交互に実行する期間では、第2給紙インターバル時間はtである。さらに、循環式搬送手段で表裏反転された記録紙に対する裏面画像形成のみを実行する期間では、第2給紙インターバル時間は再び2tである。
Here, as shown in FIGS. 5B and 5C, the second paper feed interval time does not change between the single-sided image formation and the batch transport double-sided image formation, and is t.
On the other hand, as shown in FIG. 5 (a), it changes to 2t, t, and 2t at the time of alternately conveying double-sided image formation. That is, the second paper feed interval time is 2t in the period in which the recording paper on which only the front surface image formation is performed in the state where the paper passing interval is provided for the alternate transport double-sided image formation is sent to the circulation transport means. The second paper feed interval time is t in a period in which the back side image formation on the recording paper reversed by the circulation type conveying means and the front side image formation on the recording paper from the paper feeding unit are alternately executed. Further, the second paper feed interval time is again 2t in the period in which only the back side image formation is performed on the recording paper that has been turned upside down by the circulation type conveying means.

そして、制御部101の指示により、プリントエンジン160は画像形成を実行する(図4S8)。
そして、制御部101は、実行中の画像形成が完了するかを判断し(図4S9)、完了するのであれば(図4S9でY)、画像形成動作を終了する。また、画像形成が完了しないのであれば(図4S9でN)、制御部101は、給紙部からの第1給紙が必要であるかを判断する(図4S10)。すなわち、第1給紙が必要である場合には(図4S10でY)、S1に戻り第1給紙を実行する(図4S1)。また、画像形成の途中であるものの、第1給紙が必要でない場合は(図4S10でN)、循環式搬送手段によって循環されてきた記録紙に対して第2給紙を実行する(図4S3)。以下、画像形成が完了するまで、以上の第1給紙あるいは第2給紙を繰り返す。
The print engine 160 executes image formation according to an instruction from the control unit 101 (S8 in FIG. 4).
Then, the control unit 101 determines whether the image formation being executed is completed (S9 in FIG. 4). If completed (Y in FIG. 4S), the image forming operation is terminated. If the image formation is not completed (N in FIG. 4 S9), the control unit 101 determines whether the first paper feed from the paper feed unit is necessary (S10 in FIG. 4). That is, when the first paper feed is necessary (Y in FIG. 4 S10), the process returns to S1 to execute the first paper feed (S1 in FIG. 4). If the first paper feeding is not necessary (N in FIG. 4 S10) while image formation is in progress, the second paper feeding is performed on the recording paper circulated by the circulation type conveying means (S3 in FIG. 4). ). Thereafter, the first paper feed or the second paper feed is repeated until the image formation is completed.

ところで、以上の第1給紙(図4S1)を実行した後、記録紙が第1給紙により搬送されているかを第1給紙センサ31sにて検知(図4S2)した場合に、記録紙の搬送が第1給紙センサ31sにて検知されない場合(図4S2でN)には、制御部101は、現在実行中の画像形成が交互搬送両面画像形成モードであるかを判断し(図4S11)、交互搬送両面画像形成モードであれば(図4S11でY)、給紙リトライ制御規定時間を経過しているかを判断する(図4S12)。   By the way, after the above first paper feed (S1 in FIG. 4) is executed, if the first paper feed sensor 31s detects whether the recording paper is conveyed by the first paper feed (S2 in FIG. 4), When the conveyance is not detected by the first paper feed sensor 31s (N in FIG. 4S2), the control unit 101 determines whether the image formation currently being executed is the alternate conveyance duplex image formation mode (S11 in FIG. 4). If it is the alternate conveyance double-sided image formation mode (Y in FIG. 4), it is determined whether the prescribed time for paper feed retry control has elapsed (S12 in FIG. 4).

ここで、給紙リトライ制御規定時間とは、交互搬送両面画像形成モード時において、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、給紙リトライを実行するために、給紙リトライに要する時間を除いて定められた判断時間であり、第1給紙された記録紙が確実に第1給紙センサ31sに検知される時間を超え、かつ、後述する給紙ジャム検知時間より短く定められている。   Here, the sheet feed retry control regulation time is the time of the alternate conveyance double-sided image formation mode in which the first paper feed interval is twice the normal interval and there is a time margin in the alternate conveyance double-sided image formation mode. The determination time is determined except for the time required for the paper feed retry in order to execute the paper feed retry, and the time for which the first paper feed sensor 31s is surely detected by the first paper feed sensor 31s. It is set shorter than a paper jam detection time to be described later.

なお、交互搬送両面画像形成モードでなければ(図4S11でN)、制御部101は、この時点で給紙ジャム検知時間を経過していないかを調べる(図4S13)。制御部101は、給紙ジャム検知時間を経過していれば(図4S13でY)画像形成動作をジャムのために停止させ(図4S14)、給紙ジャム検知時間を経過していなければ(図4S13でN)、第1給紙された記録紙の検知に戻る(図4S2)。   If the mode is not the alternate conveyance double-sided image formation mode (N in FIG. 4 S11), the control unit 101 checks whether the paper jam detection time has elapsed at this point (S13 in FIG. 4). If the paper jam detection time has elapsed (Y in FIG. 4S13), the control unit 101 stops the image forming operation for the jam (FIG. 4S14), and if the paper jam detection time has not elapsed (FIG. 4). The process returns to the detection of the first fed recording sheet (S2 in FIG. 4).

また、交互搬送両面画像形成モード時であって、給紙リトライ制御規定時間を経過していれば(図4S12でY)、制御部101は給紙クラッチをOFFにすることで、第1給紙ローラ31の駆動を停止(一時中断)させる(図4S15)。また、制御部101は、この時点で給紙ジャム検知時間を経過していないかを調べる(図4S16)。制御部101は、給紙ジャム検知時間を経過していれば(図4S16でY)画像形成動作をジャムのために停止させ(図4S14)、給紙ジャム検知時間を経過していなければ(図4S16でN)、給紙リトライとして第1給紙を再度実行する(図4S1)。   In the alternate transport duplex image formation mode, if the specified time limit for the paper feed retry control has elapsed (Y in S12 in FIG. 4), the control unit 101 turns off the paper feed clutch, so that the first paper feed is performed. The driving of the roller 31 is stopped (temporarily interrupted) (S15 in FIG. 4). Further, the control unit 101 checks whether the paper jam detection time has elapsed at this time (S16 in FIG. 4). If the paper jam detection time has elapsed (Y in FIG. 4S16), the control unit 101 stops the image forming operation for the jam (FIG. 4S14), and if the paper jam detection time has not elapsed (FIG. 4). In step 4S16, N), the first paper feed is executed again as a paper feed retry (S1 in FIG. 4).

すなわち、本実施形態では、片面画像形成と両面画像形成とを実行可能であって、両面画像形成として交互搬送両面画像形成モードを備えた画像形成において、給紙手段から給紙(第1給紙)を開始した後に所定時間内に記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、通常の第1給紙の間隔である片面画像形成時には実行せず、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時に実行する。このように、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、給紙リトライを実行することにより時間的余裕を有効に活用する。この結果、循環式用紙搬送機構を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, in this embodiment, single-sided image formation and double-sided image formation can be performed, and in image formation having an alternate conveyance double-sided image formation mode as double-sided image formation, paper is fed from a paper feed unit (first paper feed). ) Is started, and when a recording paper feed is not detected within a predetermined time, a paper feed retry for executing paper feeding again is not executed during single-sided image formation, which is the normal first paper feeding interval, but the first paper feeding is performed. This is executed in the alternate conveyance double-sided image forming mode in which the paper interval is twice the normal interval. As described above, the time margin is effectively utilized by executing the paper feed retry in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. . As a result, an image forming apparatus equipped with a circulation type paper transport mechanism and capable of performing alternate transport double-sided image formation is reliably and reliably improved without reducing productivity in the alternate transport double-sided image formation mode. Image formation can be executed.

また、本実施形態では、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段を備え、一括両面画像形成モードと交互搬送両面画像形成モードとの二つの両面画像形成モードで両面画像形成を実行可能な画像形成において、給紙手段から給紙(第1給紙)を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、通常の第1給紙の間隔である一括両面画像形成モード時には実行せず、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時に実行する。このように、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、給紙リトライを実行することにより時間的余裕を有効に活用する。この結果、循環式用紙搬送機構を備えて一括両面画像形成と交互搬送両面画像形成とを実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   In the present embodiment, the recording paper having the image formed on the front surface thereof is provided with a circulation type conveying means for reversing the paper without stacking and refeeding the image forming position for forming the back surface image. In image formation in which double-sided image formation can be performed in two double-sided image forming modes of the mode and the alternating conveyance double-sided image forming mode, the recording is performed within a predetermined time after starting paper feeding from the paper feeding means (first paper feeding). The paper feed retry for executing paper feeding again when paper feeding is not detected is not executed in the collective double-sided image forming mode that is the normal first paper feeding interval, and the first paper feeding interval is twice the normal. This is executed in the alternate conveyance double-sided image forming mode with an interval of. As described above, the time margin is effectively utilized by executing the paper feed retry in the alternate conveyance double-sided image forming mode in which the first paper feed interval is twice the normal interval and there is a time margin. . As a result, an image forming apparatus equipped with a circulation type paper transport mechanism and capable of performing batch double-sided image formation and alternate transport double-sided image formation can efficiently and reliably reduce productivity in the alternate transport double-sided image formation mode. Reliable image formation can be executed in an improved state.

なお、以上の実施形態において、第1給紙における給紙リトライは、第2給紙のタイミングに影響を与えない範囲で実行すればよい。これにより、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。すなわち、従来は給紙ジャムとして処理されていた第1給紙の不良を給紙リトライにより回復することが可能になる。   In the above embodiment, the paper feed retry in the first paper feed may be executed within a range that does not affect the timing of the second paper feed. Thus, reliable image formation can be performed in a state where reliability is efficiently improved without reducing productivity in the alternate conveyance duplex image formation mode. In other words, it is possible to recover from the first paper feed defect, which has been conventionally processed as a paper feed jam, by paper feed retry.

また、以上の第1実施形態では、交互搬送両面画像形成モード時における時間的余裕を活用して給紙リトライを実行することで第1給紙の信頼性を向上させるようにしていたが、この給紙リトライに代えて、第2実施形態として第1給紙速度を低下させることも可能である。   In the first embodiment described above, the reliability of the first paper feed is improved by executing the paper feed retry utilizing the time margin in the alternate conveyance double-sided image forming mode. In place of the paper feed retry, the first paper feed speed can be reduced as the second embodiment.

すなわち、この第2実施形態では、片面画像形成と両面画像形成とを実行可能であって、両面画像形成として交互搬送両面画像形成モードを備えた画像形成において、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、通常の第1給紙の間隔である片面画像形成時よりも低下させる。このように、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、第1給紙速度を低下させることにより時間的余裕を有効に活用する。この結果、循環式用紙搬送機構を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   That is, in the second embodiment, single-sided image formation and double-sided image formation can be performed, and in the image formation provided with the alternate conveyance double-sided image formation mode as double-sided image formation, the interval between the first paper feeds is normal. The first sheet feeding speed of the recording sheet from the sheet feeding unit in the alternate conveyance double-sided image forming mode at twice the interval is lower than that in the single-sided image forming which is the normal first sheet feeding interval. As described above, the time margin is made effective by reducing the first paper feed speed in the alternate conveyance double-sided image forming mode in which the interval of the first paper feed becomes twice the normal interval and there is a time margin. use. As a result, an image forming apparatus equipped with a circulation type paper transport mechanism and capable of performing alternate transport double-sided image formation is reliably and reliably improved without reducing productivity in the alternate transport double-sided image formation mode. Image formation can be executed.

また、この第2実施形態の他の例として、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段を備え、一括両面画像形成モードと交互搬送両面画像形成モードとの二つの両面画像形成モードで両面画像形成を実行可能な画像形成において、第1給紙の間隔が通常の2倍の間隔になる交互搬送両面画像形成モード時の給紙手段からの記録紙の第1給紙速度を、通常の第1給紙の間隔である一括両面画像形成時よりも低下させる。このように、第1給紙の間隔が通常の2倍の間隔になって時間的余裕が存在する交互搬送両面画像形成モード時に、第1給紙速度を低下させることにより時間的余裕を有効に活用する。この結果、循環式用紙搬送機構を備えて交互搬送両面画像形成を実行可能な画像形成装置で、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。   Further, as another example of the second embodiment, there is a circulation type conveying means for reversing the front and back without restacking the recording paper on which the image is formed on the front surface and refeeding it to the image forming position for forming the back surface image. In image formation in which double-sided image formation can be performed in two double-sided image forming modes, that is, a batch double-sided image forming mode and an alternating transport double-sided image forming mode, the first paper feed interval is alternately doubled as usual. The first paper feeding speed of the recording paper from the paper feeding means in the transport double-sided image forming mode is made lower than that at the time of batch double-sided image formation, which is the normal first paper feeding interval. As described above, the time margin is made effective by reducing the first paper feed speed in the alternate conveyance double-sided image forming mode in which the interval of the first paper feed becomes twice the normal interval and there is a time margin. use. As a result, an image forming apparatus equipped with a circulation type paper transport mechanism and capable of performing alternate transport double-sided image formation is reliably and reliably improved without reducing productivity in the alternate transport double-sided image formation mode. Image formation can be executed.

なお、以上の第2実施形態において、第1給紙速度の低速化は、低速化した第1給紙速度でレジストローラに記録紙が到達するまでの時間の遅れによって、第2給紙のタイミングに影響を与えない範囲で実行すればよい。これにより、交互搬送両面画像形成モード時に生産性を落とすことなく効率的に信頼性を向上させた状態で確実な画像形成を実行することができる。すなわち、従来は給紙ジャムが発生しやすかった第1給紙の不良を第1給紙速度の低速化により未然に防止することが可能になる。   In the second embodiment described above, the first paper feed speed is reduced due to the delay in time until the recording paper reaches the registration roller at the first paper feed speed that has been reduced. It is sufficient to execute within a range that does not affect the above. Thus, reliable image formation can be performed in a state where reliability is efficiently improved without reducing productivity in the alternate conveyance duplex image formation mode. In other words, it is possible to prevent the first paper feeding failure that has been likely to cause paper feeding jam in the prior art by lowering the first paper feeding speed.

〈その他の実施形態〉
なお、以上の図2の装置の具体例においてはモノクロ画像形成装置を用いたが、カラー画像形成装置であっても、以上の各実施形態の内容を適用して良好な結果を得ることが可能である。また、感光体ドラムの代わりに中間転写体ベルトを使用する画像形成装置であっても同様に本実施形態によって良好な結果(生産性の向上)を得ることができる。
<Other embodiments>
In the specific example of the apparatus shown in FIG. 2, the monochrome image forming apparatus is used. However, even in the case of a color image forming apparatus, it is possible to obtain good results by applying the contents of the above embodiments. It is. Even in the case of an image forming apparatus that uses an intermediate transfer belt instead of the photosensitive drum, a good result (improvement of productivity) can be obtained by the present embodiment.

また、複写機、ファクシミリ装置、プリンタなどの各種の装置について、かつ、レーザビームを用いる電子写真方式のもののほか、LEDプリントヘッドを用いるものや、インクジェット方式のものであっても本実施形態により良好な結果を得ることができる。   In addition, various embodiments such as a copying machine, a facsimile machine, and a printer, and an electrophotographic system using a laser beam, an apparatus using an LED print head, and an inkjet system are also good according to this embodiment. Results can be obtained.

本発明の実施形態の画像形成装置の電気的構成を示す構成図である。1 is a configuration diagram illustrating an electrical configuration of an image forming apparatus according to an exemplary embodiment of the present invention. 本発明の実施形態の画像形成装置の機械的構成を示す構成図である。1 is a configuration diagram illustrating a mechanical configuration of an image forming apparatus according to an exemplary embodiment of the present invention. 本発明の実施形態の画像形成装置の機械的構成と通紙状態とを示す説明図である。FIG. 2 is an explanatory diagram illustrating a mechanical configuration and a sheet passing state of the image forming apparatus according to the embodiment of the present invention. 本発明の第一実施形態の画像形成装置の基本動作状態を示すフローチャートである。3 is a flowchart illustrating a basic operation state of the image forming apparatus according to the first embodiment of the present invention. 本発明の実施形態の画像形成装置における動作の様子を示す説明図である。It is explanatory drawing which shows the mode of operation | movement in the image forming apparatus of embodiment of this invention.

符号の説明Explanation of symbols

100 画像形成装置
101 制御部
105 操作表示部
110 不揮発性メモリ
120 インタフェース
130 スキャナ部
140 画像処理部
150 画像記憶部
160 プリントエンジン
160a 片面画像形成搬送経路
160b 両面画像形成搬送経路(循環式搬送手段)
DESCRIPTION OF SYMBOLS 100 Image forming apparatus 101 Control part 105 Operation display part 110 Non-volatile memory 120 Interface 130 Scanner part 140 Image processing part 150 Image storage part 160 Print engine 160a Single-sided image formation conveyance path 160b Double-sided image formation conveyance path (circulation type conveyance means)

Claims (8)

記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、片面画像形成と両面画像形成とを実行可能な画像形成装置における画像形成方法であって、
前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、
前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記片面画像形成時には実行せず、前記交互搬送両面画像形成モード時に実行する、
ことを特徴とする画像形成方法。
An image forming means for forming an image on recording paper, a paper feeding means for feeding the image forming means, and a recording paper having an image formed on the front surface is turned upside down without stacking, and an image for back side image formation is formed. An image forming method in an image forming apparatus, comprising: a circulation type conveying unit that re-feeds a sheet to a forming position; and a control unit that controls an image forming operation, and capable of performing single-sided image formation and double-sided image formation.
As the double-sided image formation, after feeding the recording paper on which surface image formation has been performed in a state where a paper passing interval is provided for alternately carrying double-sided image formation, the recording paper is turned upside down by the circulation type conveyance means. An alternate conveyance double-sided image formation mode for alternately executing the circulable number of sheets on the back side of the recording sheet and forming the front side image on the recording sheet from the paper feeding unit;
When the recording paper feed is not detected within a predetermined time after starting the paper feeding from the paper feeding means, the paper feed retry for executing paper feeding again is not executed at the time of forming the single-sided image, and the alternately transporting double-sided image Run in formation mode,
An image forming method.
記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、両面画像形成を実行可能な画像形成装置における画像形成方法であって、
前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、
前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記一括搬送両面画像形成モード時には実行せず、前記交互搬送両面画像形成モード時に実行する、
ことを特徴とする画像形成方法。
An image forming means for forming an image on recording paper, a paper feeding means for feeding the image forming means, and a recording paper having an image formed on the front surface is turned upside down without stacking, and an image for back side image formation is formed. An image forming method in an image forming apparatus that includes a circulation type conveying unit that re-feeds a forming position and a control unit that controls an image forming operation and is capable of performing double-sided image formation,
When the number of recording sheets that can exist simultaneously on the conveyance path of the circulation type conveyance unit is set as the number of recyclable sheets, after the recording sheet on which surface image formation has been performed is sent to the circulation type conveyance unit, Double-sided image forming mode for performing backside image formation on recording paper that has been turned upside down by a circulation-type conveying means, and a front-side image with a sheet passing interval for alternate-sided double-sided image formation After the formed recording paper is sent to the circulation type conveying means, the back side image formation on the recording paper that is turned upside down by the circulation type conveying means and the front side image formation on the recording paper from the paper feeding unit are alternately performed. The two-sided image forming mode and the alternate conveyance double-sided image forming mode for executing the circulable number of sheets,
When the recording paper feeding is not detected within a predetermined time after starting the paper feeding from the paper feeding means, the paper feed retry for executing paper feeding again is not executed in the batch transport duplex image forming mode, but the alternating Execute in the transport duplex image formation mode,
An image forming method.
記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、片面画像形成と両面画像形成とを実行可能な画像形成装置における画像形成方法であって、
前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、
前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記片面画像形成時よりも低下させる、
ことを特徴とする画像形成方法。
An image forming means for forming an image on recording paper, a paper feeding means for feeding the image forming means, and a recording paper having an image formed on the front surface is turned upside down without stacking, and an image for back side image formation is formed. An image forming method in an image forming apparatus, comprising: a circulation type conveying unit that re-feeds a sheet to a forming position; and a control unit that controls an image forming operation, and capable of performing single-sided image formation and double-sided image formation.
As the double-sided image formation, after feeding the recording paper on which surface image formation has been performed in a state where a paper passing interval is provided for alternately carrying double-sided image formation, the recording paper is turned upside down by the circulation type conveyance means. An alternate conveyance double-sided image formation mode for alternately executing the circulable number of sheets on the back side of the recording sheet and forming the front side image on the recording sheet from the paper feeding unit;
Lowering the first paper feed speed of the recording paper from the paper feeding means in the alternate conveyance double-sided image formation mode as compared to when forming the single-sided image;
An image forming method.
記録紙に画像を形成する画像形成手段と、前記画像形成手段に給紙する給紙手段と、表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、画像形成動作を制御する制御手段とを備え、両面画像形成を実行可能な画像形成装置における画像形成方法であって、
前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、
前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記一括搬送両面画像形成モード時よりも低下させる、
ことを特徴とする画像形成方法。
An image forming means for forming an image on recording paper, a paper feeding means for feeding the image forming means, and a recording paper having an image formed on the front surface is turned upside down without stacking, and an image for back side image formation is formed. An image forming method in an image forming apparatus that includes a circulation type conveying unit that re-feeds a forming position and a control unit that controls an image forming operation and is capable of performing double-sided image formation,
When the number of recording sheets that can exist simultaneously on the conveyance path of the circulation type conveyance unit is set as the number of recyclable sheets, after the recording sheet on which surface image formation has been performed is sent to the circulation type conveyance unit, Double-sided image forming mode for performing backside image formation on recording paper that has been turned upside down by a circulation-type conveying means, and a front-side image with a sheet passing interval for alternate-sided double-sided image formation After the formed recording paper is sent to the circulation type conveying means, the back side image formation on the recording paper that is turned upside down by the circulation type conveying means and the front side image formation on the recording paper from the paper feeding unit are alternately performed. Two duplex image forming modes including an alternating conveyance duplex image forming mode for executing the circulable number of sheets,
Lowering the first sheet feeding speed of the recording paper from the sheet feeding unit in the alternate conveyance double-sided image formation mode than in the batch conveyance double-sided image formation mode;
An image forming method.
記録紙に画像を形成する画像形成手段と、
前記画像形成手段に給紙する給紙手段と、
表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、
片面画像形成と両面画像形成とを制御する制御手段とを備え、
前記制御手段は、前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記片面画像形成時には実行せず、前記交互搬送両面画像形成モード時に実行する、
ことを特徴とする画像形成装置。
Image forming means for forming an image on recording paper;
A paper feeding means for feeding the image forming means;
Circulation type conveying means for reversing the front and back without restacking the recording paper on which the image is formed on the front surface and refeeding it to the image forming position for backside image formation;
Control means for controlling single-sided image formation and double-sided image formation,
The control means, as the double-sided image formation, feeds the recording paper on which surface image formation has been performed in a state where a paper-passing interval is provided for alternate-conveyance double-sided image formation to the circulation-type conveyance means, and then the circulation-type conveyance A double-sided image forming mode for alternately carrying out the circulable number of sheets on the back side of the recording paper and the front side image forming on the recording paper from the paper feeding unit. A paper feed retry for executing paper feeding again when the recording paper feeding is not detected within a predetermined time after starting the paper is not executed at the time of the single-sided image formation, but is executed at the time of the alternate transport double-sided image formation mode;
An image forming apparatus.
記録紙に画像を形成する画像形成手段と、
前記画像形成手段に給紙する給紙手段と、
表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、
両面画像形成動作を制御する制御手段とを備え、
前記制御手段は、前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、前記給紙手段から給紙を開始した後に所定時間内に前記記録紙の送り出しが検知されない場合に給紙を再度実行させる給紙リトライを、前記一括搬送両面画像形成モード時には実行せず、前記交互搬送両面画像形成モード時に実行する、
ことを特徴とする画像形成装置。
Image forming means for forming an image on recording paper;
A paper feeding means for feeding the image forming means;
Circulation type conveying means for reversing the front and back without restacking the recording paper on which the image is formed on the front surface and refeeding it to the image forming position for backside image formation;
Control means for controlling the double-sided image forming operation,
When the number of recording sheets that can simultaneously exist on the conveyance path of the circulation type conveyance means is set as the number of circulationable sheets, the control means uses the circulation sheet for recording images on which surface image formation has been performed. After feeding, a batch transport double-sided image formation mode in which back-side image formation is performed on the recording paper that has been turned upside down by the circulation type transport means, and a sheet passing interval is formed for alternate transport double-sided image formation. After the recording paper on which surface image formation has been performed in this state is fed to the circulation type conveyance means, the back side image formation is performed on the recording paper that is turned upside down by the circulation type conveyance means, and the front surface image on the recording paper from the paper feeding unit Two double-sided image forming modes including an alternating conveyance double-sided image forming mode that alternately executes the number of recyclable sheets, and within a predetermined time after starting feeding from the paper feeding means The paper feed retry to execute the paper feed when the feed of the recording paper is not detected again, the the bundle conveyance double-sided image forming mode without executing executes the alternately conveying the double-sided image forming mode,
An image forming apparatus.
記録紙に画像を形成する画像形成手段と、
前記画像形成手段に給紙する給紙手段と、
表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、
片面画像形成と両面画像形成とを制御する制御手段とを備え、
前記制御手段は、前記両面画像形成として、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードを備え、前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記片面画像形成時よりも低下させる、
ことを特徴とする画像形成装置。
Image forming means for forming an image on recording paper;
A paper feeding means for feeding the image forming means;
Circulation type conveying means for reversing the front and back without restacking the recording paper on which the image is formed on the front surface and refeeding it to the image forming position for backside image formation;
Control means for controlling single-sided image formation and double-sided image formation,
The control means, as the double-sided image formation, feeds the recording paper on which surface image formation has been performed in a state where a paper-passing interval is provided for alternate-conveyance double-sided image formation to the circulation-type conveyance means, and then the circulation-type conveyance A double-sided image forming mode for alternately transporting, wherein the backside image formation on the recording paper reversed by the means and the front side image formation on the recording paper from the paper supply unit are alternately executed in the circulable number of sheets. Lowering the first paper feed speed of the recording paper from the paper feeding means in the mode than during the single-sided image formation;
An image forming apparatus.
記録紙に画像を形成する画像形成手段と、
前記画像形成手段に給紙する給紙手段と、
表面に画像が形成された記録紙をスタックせずに表裏反転して裏面画像形成のために画像形成位置に再給紙する循環式搬送手段と、
両面画像形成動作を制御する制御手段とを備え、
前記制御手段は、前記循環式搬送手段の搬送経路上に同時に存在しうる記録紙枚数を循環可能枚数とした場合に、表面画像形成を前記循環可能枚数実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対して裏面画像形成を前記循環可能枚数実行する一括搬送両面画像形成モードと、交互搬送両面画像形成のために通紙間隔をあけた状態で表面画像形成を実行した記録紙を前記循環式搬送手段に送り込んだ後に、前記循環式搬送手段で表裏反転された記録紙に対する裏面画像形成と前記給紙部からの記録紙に対する表面画像形成とを交互に前記循環可能枚数実行する交互搬送両面画像形成モードとの二つの両面画像形成モードを備え、前記交互搬送両面画像形成モード時の前記給紙手段からの記録紙の第1給紙速度を、前記一括搬送両面画像形成モード時よりも低下させる、
ことを特徴とする画像形成装置。
Image forming means for forming an image on recording paper;
A paper feeding means for feeding the image forming means;
Circulation type conveying means for reversing the front and back without restacking the recording paper on which the image is formed on the front surface and refeeding it to the image forming position for backside image formation;
Control means for controlling the double-sided image forming operation,
When the number of recording sheets that can simultaneously exist on the conveyance path of the circulation type conveyance means is set as the number of circulationable sheets, the control means uses the circulation sheet for recording images on which surface image formation has been performed. After feeding, a batch transport double-sided image formation mode in which back-side image formation is performed on the recording paper that has been turned upside down by the circulation type transport means, and a sheet passing interval is formed for alternate transport double-sided image formation. After the recording paper on which surface image formation has been performed in this state is fed to the circulation type conveyance means, the back side image formation is performed on the recording paper that is turned upside down by the circulation type conveyance means, and the front surface image on the recording paper from the paper feeding unit Two-sided image forming modes including an alternating-transport double-sided image forming mode that alternately executes formation of the circulable number of sheets, and from the sheet feeding means in the alternate-transport double-sided image forming mode A first sheet feeding speed of the recording paper lowers than the bulk conveying the double-sided image forming mode,
An image forming apparatus.
JP2005254454A 2005-09-02 2005-09-02 Image forming method and apparatus Pending JP2007065535A (en)

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Cited By (6)

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JP2009251395A (en) * 2008-04-08 2009-10-29 Canon Inc Image forming apparatus and method of controlling the same
JP2010204144A (en) * 2009-02-27 2010-09-16 Canon Inc Image forming apparatus and control method therefor
JP2011048328A (en) * 2009-07-31 2011-03-10 Brother Industries Ltd Image forming apparatus
JP2012131127A (en) * 2010-12-22 2012-07-12 Riso Kagaku Corp Printer
JP2016084194A (en) * 2014-10-23 2016-05-19 理想科学工業株式会社 Printing device
WO2017209171A1 (en) * 2016-06-01 2017-12-07 株式会社小森コーポレーション Printer

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009251395A (en) * 2008-04-08 2009-10-29 Canon Inc Image forming apparatus and method of controlling the same
JP2010204144A (en) * 2009-02-27 2010-09-16 Canon Inc Image forming apparatus and control method therefor
JP2011048328A (en) * 2009-07-31 2011-03-10 Brother Industries Ltd Image forming apparatus
US8272641B2 (en) 2009-07-31 2012-09-25 Brother Kogyo Kabushiki Kaisha Image forming apparatus
JP2012131127A (en) * 2010-12-22 2012-07-12 Riso Kagaku Corp Printer
JP2016084194A (en) * 2014-10-23 2016-05-19 理想科学工業株式会社 Printing device
WO2017209171A1 (en) * 2016-06-01 2017-12-07 株式会社小森コーポレーション Printer
JPWO2017209171A1 (en) * 2016-06-01 2019-01-24 株式会社小森コーポレーション Printing device
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