JP2014077826A - Image forming apparatus - Google Patents
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Description
用紙搬送手段によって搬送される用紙に画像を形成する画像形成手段と、
前記画像形成手段で画像が形成された用紙を表裏反転して前記用紙搬送手段に搬送する再給紙搬送手段と、
印刷ジョブの印刷に係る前記用紙の属性を特定する用紙属性管理手段と、
前記用紙の第1面に形成される前記画像の画像密度情報を取得する画像密度情報取得手段と、
前記画像形成手段よりも用紙搬送方向の上流側で互いに接触する一対のレジストローラに前記用紙が突き当てられてループが形成されることで前記用紙の姿勢を修正する用紙姿勢補正手段と、
用紙の両面に画像を形成する両面画像形成処理において、前記用紙の第2面に画像を形成する際には、前記用紙の属性と前記用紙の第1面に形成される画像の画像密度に基づいて、前記用紙に形成するループ量を変更する制御手段と、を備える、
ことを特徴とする。 In order to solve the above-mentioned problem, an image forming apparatus according to claim 1,
Image forming means for forming an image on paper conveyed by the paper conveying means;
A paper refeeding conveyance unit configured to reverse the paper on which the image is formed by the image forming unit and convey it to the paper conveyance unit;
Paper attribute management means for specifying attributes of the paper relating to printing of a print job;
Image density information acquisition means for acquiring image density information of the image formed on the first surface of the paper;
A paper posture correction unit that corrects the posture of the paper by forming a loop by abutting the paper against a pair of registration rollers that are in contact with each other upstream of the image forming unit in the paper conveyance direction;
In a double-sided image forming process for forming images on both sides of a sheet, when forming an image on the second side of the sheet, based on the attribute of the sheet and the image density of the image formed on the first side of the sheet And a control means for changing a loop amount formed on the paper,
It is characterized by that.
前記用紙姿勢補正手段が、前記レジストローラよりも用紙搬送方向の上流側で前記用紙を前記レジストローラに向かって搬送する互いに接触する一対の搬送ローラを備え、前記レジストローラを停止させた状態で、前記搬送ローラを回転させて前記用紙に形成するループ量を変更する、
ことを特徴とする。 The image forming apparatus according to claim 2 is the image forming apparatus according to claim 1,
In a state in which the paper posture correction means includes a pair of conveyance rollers that contact each other to convey the paper toward the registration roller on the upstream side in the paper conveyance direction with respect to the registration roller, and the registration roller is stopped. Changing the amount of loop formed on the paper by rotating the transport roller;
It is characterized by that.
コンピュータに、
用紙搬送手段によって搬送される用紙に画像を形成する画像形成機能と、
前記画像が形成された用紙を表裏反転して前記用紙搬送手段に搬送する再給紙搬送機能と、
印刷ジョブの印刷に係る前記用紙の属性を特定する特定機能と、
前記用紙の第1面に形成される前記画像の画像密度情報を取得する画像密度情報取得機能と、
前記画像形成手段よりも用紙搬送方向の上流側で互いに接触する一対のレジストローラに前記用紙が突き当てられてループが形成されることで前記用紙の姿勢を修正する用紙姿勢補正機能と、
用紙の両面に画像を形成する両面画像形成処理において、前記用紙の第2面に画像を形成する際には、前記用紙の属性と前記用紙の第1面に形成される画像の画像密度に基づいて、前記用紙に形成するループ量を変更する機能と、
を実現する、
ことを特徴とする。 In order to solve the above problem, a program according to claim 3 is provided.
On the computer,
An image forming function for forming an image on a sheet conveyed by a sheet conveying unit;
A paper re-feed conveyance function for reversing the paper on which the image is formed and conveying it to the paper conveyance means;
A specific function for specifying the attribute of the paper related to printing of the print job;
An image density information acquisition function for acquiring image density information of the image formed on the first surface of the paper;
A paper attitude correction function that corrects the attitude of the paper by forming a loop by abutting the paper against a pair of registration rollers that are in contact with each other upstream of the image forming unit in the paper conveyance direction;
In a double-sided image forming process for forming images on both sides of a sheet, when forming an image on the second side of the sheet, based on the attribute of the sheet and the image density of the image formed on the first side of the sheet A function of changing a loop amount formed on the paper;
Realizing
It is characterized by that.
また、以下の図面を使用した説明において、図面は模式的なものであり、各寸法の比率等は現実のものとは異なることに留意すべきであり、理解の容易のために説明に必要な部材以外の図示は適宜省略されている。 Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and examples. However, the present invention is not limited to these embodiments and examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.
(1.1)画像形成装置の全体構成
図1は本実施形態に係る画像形成装置1の概略構成の一例を示す断面模式図である。
画像形成装置1は、画像形成部10と、画像形成部10の一端に装着された用紙送り装置20と、画像形成部10の他の一端に設けられ、印刷された用紙Pが排紙される排紙部30と、操作情報部40と、上位機器から送信された印刷情報から画像イメージを生成する画像処理部50と、を備えて構成されている。 (1) Overall Configuration and Operation of Image Forming Apparatus (1.1) Overall Configuration of Image Forming Apparatus FIG. 1 is a schematic cross-sectional view showing an example of a schematic configuration of an image forming apparatus 1 according to the present embodiment.
The image forming apparatus 1 is provided at the other end of the image forming unit 10, the sheet feeding device 20 attached to one end of the image forming unit 10, and the image forming unit 10. A paper unit 30, an operation information unit 40, and an image processing unit 50 that generates an image image from print information transmitted from a higher-level device are configured.
このような構成の画像形成装置1では、画像形成のタイミングに合わせて用紙送り装置20のうち、印刷ジョブで印刷の1枚毎に指定されたトレイから繰り出された用紙Pが画像形成部10へ送り込まれる。 (1.2) Configuration and Operation of Image Forming Unit In the image forming apparatus 1 having such a configuration, the paper feeding device 20 in accordance with the timing of image formation starts from the tray specified for each print in the print job. The fed paper P is sent to the image forming unit 10.
現像装置14各々は、現像ハウジング141に収容される現像剤を除いて略同様に構成され、それぞれがイエロー(Y)、マゼンタ(M)、シアン(C)、黒(K)のトナー像を形成する。 The developing device 14 has a developing housing 141 in which a developer is accommodated. In the developing housing 141, a developing roller 142 disposed to face the photosensitive drum 131 is disposed, and a layer regulating member (not shown) that regulates the layer thickness of the developer is disposed close to the developing roller 142. Has been.
Each of the developing devices 14 is configured in substantially the same manner except for the developer contained in the developing housing 141, and each forms a toner image of yellow (Y), magenta (M), cyan (C), and black (K). To do.
中間転写ベルト151上の重畳トナー像は、中間転写ベルト151の移動に伴って二次転写ローラ153が配置された領域(二次転写部TR)に搬送される。重畳トナー像が二次転写部TRに搬送されると、そのタイミングに合わせて用紙送り装置20から用紙Pが二次転写部TRに供給される。そして、二次転写ローラ153には、システム制御装置11により制御される電源装置等から所定の転写電圧が印加され、用紙Pに中間転写ベルト151上の多重トナー像が一括転写される。 Each color toner image formed on the photoconductive drum 131 of each photoconductive unit 13 is intermediately transferred by a primary transfer roller 152 to which a predetermined transfer voltage is applied from a power supply device (not shown) controlled by the system control device 11. Electrostatic transfer (primary transfer) is sequentially performed on the belt 151 to form a superimposed toner image in which toner of each color is superimposed.
The superimposed toner image on the intermediate transfer belt 151 is conveyed to a region (secondary transfer unit TR) where the secondary transfer roller 153 is disposed as the intermediate transfer belt 151 moves. When the superimposed toner image is conveyed to the secondary transfer portion TR, the paper P is supplied from the paper feeding device 20 to the secondary transfer portion TR in accordance with the timing. Then, a predetermined transfer voltage is applied to the secondary transfer roller 153 from a power supply device or the like controlled by the system controller 11, and the multiple toner images on the intermediate transfer belt 151 are collectively transferred to the paper P.
転写装置15においてトナー像が転写された用紙Pは、トナー像が未定着の状態で用紙搬送装置16aを経由して定着装置17に搬送される。定着装置17に搬送された用紙Pは、一対の定着ベルト171と加圧ローラ172により、圧着と加熱の作用でトナー像が定着される。 The fixing device 17 includes an endless fixing belt 171 that rotates in one direction, and a pressure roller 172 that is in contact with the circumferential surface of the fixing belt 171 and rotates in one direction, and includes the fixing belt 171 and the pressure roller 172. A nip portion N (fixing region) is formed by the pressure contact region.
The paper P onto which the toner image has been transferred by the transfer device 15 is conveyed to the fixing device 17 via the paper conveying device 16a with the toner image being unfixed. The sheet P conveyed to the fixing device 17 is fixed with a toner image by a pressure bonding and heating action by a pair of fixing belts 171 and a pressure roller 172.
用紙Pの両面に画像出力を行う場合には、用紙搬送装置16cにより当該用紙Pの表裏が反転され、合流搬送部25、姿勢補正部26を通過して、レジストローラ27で姿勢制御され、再び画像形成部10における二次転写部TRへ送り込まれる。そして、トナー像の転写および転写像の定着が行われた後に、排紙部30に送り込まれることになる。排紙部30へ送り込まれた用紙Pは、必要に応じて裁断やステープル(針綴じ)等の後処理を経た後に、排紙トレイ上へ排出される。 After the fixing, the paper P passes through the paper transport device 16 b and is sent to the paper discharge unit 30.
When image output is performed on both sides of the paper P, the front and back sides of the paper P are reversed by the paper transport device 16c, passed through the merging transport unit 25 and the posture correction unit 26, and subjected to posture control by the registration rollers 27. It is sent to the secondary transfer unit TR in the image forming unit 10. Then, after the toner image is transferred and the transferred image is fixed, the toner image is sent to the paper discharge unit 30. The paper P sent to the paper discharge unit 30 is discharged onto the paper discharge tray after being subjected to post-processing such as cutting and stapling (needle binding) as necessary.
図2は本実施形態に係る画像形成装置1のシステム制御装置11の構成を示したブロック図である。 (1.3) Block Configuration of Image Forming Apparatus FIG. 2 is a block diagram showing the configuration of the system control apparatus 11 of the image forming apparatus 1 according to this embodiment.
又、システム制御装置11は、画像形成部10が備える電源制御部107に対して、動作制御指示を与える。すなわち、電源制御部107が画像形成部10、用紙送り装置20への給電を行うか否かを決定し、その決定結果を当該電源制御部107に対して指示する。
更に、システム制御装置11は、画像形成部10が備える操作情報部40で入力された処理要求、または、画像形成部10と通信回線81を介して接続するホストコンピュータ82で入力された処理要求を認識して、その処理要求を受け付けるようになっている。 The system control device 11 gives an operation control instruction to the image input unit 102, the image processing unit 103, the image storage unit 104, the image output unit 105, the post-processing device control unit 106, and the like included in the image forming unit 10.
Further, the system control apparatus 11 gives an operation control instruction to the power supply control unit 107 provided in the image forming unit 10. That is, the power control unit 107 determines whether or not to supply power to the image forming unit 10 and the sheet feeding device 20, and instructs the power control unit 107 about the determination result.
Further, the system control device 11 receives a processing request input from the operation information unit 40 included in the image forming unit 10 or a processing request input from the host computer 82 connected to the image forming unit 10 via the communication line 81. It recognizes and accepts the processing request.
又、用紙送り装置20に設置されている給紙トレイの動作を制御するトレイ制御部22に対して、動作制御指示を与えるようになっている。
用紙搬送部71は、用紙搬送装置16a、16b、16cの動作を制御して用紙を搬送させる。又、例えば、パスセンサS1、プレレジセンサS2、レジセンサS3が用紙を検知したタイミングの情報に基づいて、姿勢補正部26でのループ形成時間T1を決定し、ループ形成時間に応じた量のループを用紙Pに形成させる。また、タイミング生成部(不図示)から供給される基準信号に応じて用紙Pを二次転写部TRへ送り込む。 The sheet feeding device 20 includes a control unit 21 including a combination of a CPU, a RAM, a ROM, and the like, and the control unit 21 exchanges information with the image forming unit 10.
Further, an operation control instruction is given to the tray control unit 22 that controls the operation of the paper feed tray installed in the paper feeding device 20.
The paper transport unit 71 controls the operations of the paper transport devices 16a, 16b, and 16c to transport the paper. Further, for example, based on the timing information when the path sensor S1, the pre-registration sensor S2, and the registration sensor S3 detect the sheet, the loop forming time T1 in the posture correction unit 26 is determined, and an amount of loops corresponding to the loop forming time is determined on the sheet P. To form. Further, the paper P is sent to the secondary transfer unit TR in accordance with a reference signal supplied from a timing generation unit (not shown).
(2.1)両面印刷時の動作
画像形成装置1において、両面印刷を行う場合は、画像形成部10のシステム制御装置11は、印刷ジョブのデータに基づいてイメージデータを生成する画像処理部50へイメージデータ転送要求を行う。
画像形成部10からイメージデータ転送要求を受け付けた画像処理部50は、画像形成部10へイメージデータ転送準備が完了した段階で、イメージデータ転送準備完了通知を行う。
イメージデータ転送準備完了通知を受けた画像形成部10のシステム制御装置11は、画像形成処理を実行して、用紙送り装置20から供給された用紙Pの第1面(表面)にトナー像を形成する。 (2) Double-sided printing control and action of image forming apparatus (2.1) Operation at the time of double-sided printing When performing double-sided printing in the image forming apparatus 1, the system control unit 11 of the image forming unit 10 prints print job data. Based on the above, an image data transfer request is made to the image processing unit 50 that generates image data.
Upon receiving the image data transfer request from the image forming unit 10, the image processing unit 50 notifies the image forming unit 10 of completion of image data transfer preparation when the image data transfer preparation is completed.
The system control device 11 of the image forming unit 10 that has received the image data transfer preparation completion notification executes image forming processing and forms a toner image on the first surface (front surface) of the paper P supplied from the paper feeding device 20. .
レジストローラ27は互いに圧接状態に保持された一対のロールによって構成され、これら一対のローラ間で用紙Pをニップしつつ、このローラ対を回転させることによって二次転写部TRに用紙Pを送り込む。 The second surface of the paper P is composed of a plurality of roller groups and passes through a posture correction unit 26 that corrects the posture of the paper P, and then abuts against the nip portion of the registration roller 27 to form a registration loop.
The registration roller 27 is constituted by a pair of rolls held in pressure contact with each other. The sheet P is fed to the secondary transfer portion TR by rotating the roller pair while nipping the sheet P between the pair of rollers.
図3は、レジストローラ27を中心とした各種ローラの配置を説明する模式図である。以下図面を参照しながら二次転写部TRに送り込まれる用紙Pの姿勢制御について説明する。 (2.2) Paper Posture Control FIG. 3 is a schematic diagram for explaining the arrangement of various rollers around the registration roller 27. Hereinafter, the attitude control of the paper P sent to the secondary transfer unit TR will be described with reference to the drawings.
具体的には、搬送ローラ26bからプレレジローラ26aへ用紙Pを送り込んだ後、レジストローラ27の回転を停止しておき、用紙Pの先端をレジストローラ27に付き当てる。この状態でプレレジローラ26aによって用紙Pを余分に送ることで用紙Pにループ(レジループ)を形成する。レジループ量は、例えば、用紙属性管理手段としての操作情報部40を介して設定された用紙厚みや用紙目等の用紙属性情報によって、適宜設定される。
そして、このレジループを形成した状態でレジストローラ27の回転を開始することで用紙Pのスキュー補正を行いながら用紙Pは二次転写部TRへ送り込まれる。 Based on the detection result of the sensor, the registration roller 27 and the pre-registration roller 26a are independently driven and controlled by respective motors (not shown).
Specifically, after feeding the paper P from the transport roller 26b to the pre-registration roller 26a, the rotation of the registration roller 27 is stopped, and the leading edge of the paper P is applied to the registration roller 27. In this state, a loop (registration loop) is formed on the paper P by feeding the paper P excessively by the pre-registration roller 26a. The registration loop amount is appropriately set according to, for example, paper attribute information such as a paper thickness and a paper mesh set via the operation information unit 40 as a paper attribute management unit.
Then, rotation of the registration roller 27 is started in a state where the registration loop is formed, and the sheet P is fed to the secondary transfer portion TR while performing skew correction of the sheet P.
図5(a)に示すように、第1面に形成されるイメージの画像密度が低い場合、用紙Pの厚みは殆ど変化せず用紙Pのこしが強まることはない。そのために、この状態でレジループの形成を行ってもレジストローラ27のニップ部への押し込みは発生しない。
一方、図5)b)に示すように、第1面に形成されるイメージの画像密度が高い場合、用紙Pの厚みが増加する。この状態でレジループの形成を行うと、用紙Pの厚みによりいわゆる用紙Pのこしが強まり レジストローラ27のニップ部への押し込みが発生する。この状態で、レジストローラ27を回転させ二次転写部TRに用紙Pを送り込んだ場合には、第2面目のイメージ位置と用紙位置にずれが発生する(図5(b)参照)。 FIG. 5 shows the paper P when the orientation of the paper P on which the toner image is formed on the first surface is again controlled by the registration roller 27 when forming an image on the second surface of the paper P in the double-sided printing process. It is a schematic diagram explaining the loop state of.
As shown in FIG. 5A, when the image density of the image formed on the first surface is low, the thickness of the paper P hardly changes and the paper P does not become stiff. Therefore, even if the registration loop is formed in this state, the registration roller 27 is not pushed into the nip portion.
On the other hand, as shown in FIG. 5) b), when the image density of the image formed on the first surface is high, the thickness of the paper P increases. When the registration loop is formed in this state, the so-called paper P is squeezed due to the thickness of the paper P, and the registration roller 27 is pushed into the nip portion. In this state, when the registration roller 27 is rotated and the paper P is fed to the secondary transfer portion TR, a deviation occurs between the image position of the second surface and the paper position (see FIG. 5B).
本実施形態に係る画像形成装置1において、システム制御装置11は、第1面に形成されるイメージの画像密度情報に基づいて、レジループを形成するための搬送時間を決定する。
図4は、本実施形態に係る画像形成装置1が行う両面印刷におけるレジループ制御における処理の流れを示すフローチャートである。以下、本実施形態に係る画像形成装置1における両面印刷制御をフローチャートを参照しながら説明する。 (2.2) Residue Loop Control During Double-Sided Printing In the image forming apparatus 1 according to the present embodiment, the system controller 11 forms a registration loop based on image density information of an image formed on the first surface. Determine the transport time.
FIG. 4 is a flowchart showing a flow of processing in registration loop control in double-sided printing performed by the image forming apparatus 1 according to the present embodiment. Hereinafter, double-sided printing control in the image forming apparatus 1 according to the present embodiment will be described with reference to flowcharts.
そして、印刷ジョブが両面印刷ではない場合(S101;No)、システム制御装置11は、予め定められた通常印刷の処理を行う(S102)。 When starting the image forming process, the system control apparatus 11 first determines whether or not the print job is double-sided printing (S101).
If the print job is not double-sided printing (S101; No), the system control apparatus 11 performs a predetermined normal printing process (S102).
そして、システム制御装置11は、画像処理部50によって生成された第1面のイメージデータのピクセルカウント数(画像密度)を取得し、記憶部(RAM)に記憶する(S103)。 When it is determined that the print job is double-sided printing (S101; Yes), the system control apparatus 11 performs printing on the first side (front side) according to a predetermined normal printing process (S102).
Then, the system control device 11 acquires the pixel count number (image density) of the image data of the first surface generated by the image processing unit 50 and stores it in the storage unit (RAM) (S103).
システム制御装置11は、プレレジローラ26aの回転送りによってレジループを形成した後、レジストローラ27を回転駆動して用紙Pを二次転写部TRへ送り込み、用紙Pの第2面(裏面)にトナー像を形成する(S108)。 Then, the system controller 11 adds the acquired feed amount correction value to the feed amount appropriately set according to the paper attribute information such as the paper thickness and the paper eye set via the operation information unit 40, and the preregistration roller 26a. Rotational feed control is performed to determine the amount of registration loop on the second surface (back surface) (S107).
The system control device 11 forms a registration loop by rotating and feeding the pre-registration roller 26a, and then rotates and drives the registration roller 27 to feed the paper P to the secondary transfer portion TR, so that a toner image is formed on the second surface (back surface) of the paper P. Form (S108).
本実施形態に係る画像形成装置1は、両面印刷を行う場合に、第1面に形成されるイメージの画像密度情報に基づいて、レジストローラ27で形成される第2面のレジループ量を決定する。
そのために、例えば、第1面に形成されるイメージの画像密度が高く、用紙Pの厚みが増加して用紙Pのこしが強まった場合であっても、プレレジローラ26aの回転送り量は画像密度に基づいて補正される。
従って、レジストローラ27のニップ部への用紙Pの先端の押し込みが抑制され、第2面目のイメージ位置と用紙位置にずれが発生することがない(図5(c)参照)。 (3) Action / Effect The image forming apparatus 1 according to the present embodiment, when performing double-sided printing, is a second surface formed by the registration rollers 27 based on image density information of an image formed on the first surface. Determine the amount of the registration loop.
For this reason, for example, even when the image density of the image formed on the first surface is high and the thickness of the paper P is increased and the strain of the paper P is increased, the rotational feed amount of the pre-registration roller 26a is based on the image density. Corrected.
Accordingly, the pushing of the leading edge of the paper P into the nip portion of the registration roller 27 is suppressed, and there is no deviation between the image position of the second surface and the paper position (see FIG. 5C).
表裏が反転されて、合流搬送部25に到達した1枚目の用紙Pは、上記の次の用紙Pが姿勢補正部26から搬送されるのを待って、姿勢補正部26に搬送され、第1面に形成されたイメージの画像密度情報に基づいて、レジループを形成するための搬送時間が決定される。 When the image forming apparatus 1 forms an image on both sides of a plurality of sheets P, for example, after forming an image on the first side of the first sheet P, the sheet P is used as a refeed unit. The next sheet or sheets are transported to the merging and transporting section 25 and the posture correcting section 26 until they are reversed by the sheet transporting device 16c and transported to the posture correcting section 26 again. Form an image.
The first sheet P that has been turned upside down and has reached the merging and conveying unit 25 is conveyed to the posture correcting unit 26 after waiting for the next sheet P to be conveyed from the posture correcting unit 26, Based on the image density information of the image formed on one surface, the conveyance time for forming the registration loop is determined.
尚、本願明細書中において、プログラムが予めインストールされている実施形態として説明したが、当該プログラムをCD−ROM等の記憶媒体に格納して提供することも可能であり、電気通信回線等のネットワークに接続されているサーバ装置等から画像形成装置内の記憶部にダウンロードしてもよい。 In this embodiment, the image forming apparatus 1 is described as a tandem type color printer. However, the image forming apparatus 1 may be a copying machine having a document reading function or a monochrome image forming apparatus.
In the present specification, the program has been described as an embodiment in which the program is installed in advance. However, the program can be provided by being stored in a storage medium such as a CD-ROM, and a network such as a telecommunication line. You may download to the memory | storage part in an image forming apparatus from the server apparatus etc. which are connected to.
10・・・画像形成部
11・・・システム制御装置
12・・・露光装置
13・・・感光体ユニット
14・・・現像装置
15・・・転写装置
16a、16b、16c・・・用紙搬送装置
17・・・定着装置
20・・・用紙送り装置
21・・・制御部(用紙送り装置)
22・・・トレイ制御部(用紙送り装置)
25・・・合流搬送部
26・・・姿勢補正部
26a・・・搬送ローラ(プレレジローラ)
26b・・・搬送ローラ
27・・・レジストローラ
72・・・用紙搬送部(用紙送り装置)
30・・・排紙部
40・・・操作情報部
50・・・画像処理部
80・・・通信ケーブル
81・・・通信回線
82・・・ホストコンピュータ
S1・・・パスセンサ
S2・・・プレレジセンサ
S3・・・レジセンサ DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus 10 ... Image forming part 11 ... System control apparatus 12 ... Exposure apparatus 13 ... Photoconductor unit 14 ... Developing apparatus 15 ... Transfer apparatus 16a, 16b, 16c: Paper transport device 17: Fixing device 20: Paper feed device 21: Control unit (paper feed device)
22 ... Tray control unit (paper feeding device)
25... Confluence conveyance unit 26... Posture correction unit 26 a.
26b... Transport roller 27... Registration roller 72.
30 ... paper discharge unit 40 ... operation information unit 50 ... image processing unit 80 ... communication cable 81 ... communication line 82 ... host computer S1 ... pass sensor S2 ... pre-registration sensor S3 ... Registration sensors
Claims (3)
- 用紙搬送手段によって搬送される用紙に画像を形成する画像形成手段と、
前記画像形成手段で画像が形成された用紙を表裏反転して前記用紙搬送手段に搬送する再給紙搬送手段と、
印刷ジョブの印刷に係る前記用紙の属性を特定する用紙属性管理手段と、
前記用紙の第1面に形成される前記画像の画像密度情報を取得する画像密度情報取得手段と、
前記画像形成手段よりも用紙搬送方向の上流側で互いに接触する一対のレジストローラに前記用紙が突き当てられてループが形成されることで前記用紙の姿勢を修正する用紙姿勢補正手段と、
用紙の両面に画像を形成する両面画像形成処理において、前記用紙の第2面に画像を形成する際には、前記用紙の属性と前記用紙の第1面に形成される画像の画像密度に基づいて、前記用紙に形成するループ量を変更する制御手段と、を備える、
ことを特徴とする画像形成装置。 Image forming means for forming an image on paper conveyed by the paper conveying means;
A paper refeeding conveyance unit configured to reverse the paper on which the image is formed by the image forming unit and convey it to the paper conveyance unit;
Paper attribute management means for specifying attributes of the paper relating to printing of a print job;
Image density information acquisition means for acquiring image density information of the image formed on the first surface of the paper;
A paper posture correction unit that corrects the posture of the paper by forming a loop by abutting the paper against a pair of registration rollers that are in contact with each other upstream of the image forming unit in the paper conveyance direction;
In a double-sided image forming process for forming images on both sides of a sheet, when forming an image on the second side of the sheet, based on the attribute of the sheet and the image density of the image formed on the first side of the sheet And a control means for changing a loop amount formed on the paper,
An image forming apparatus. - 前記用紙姿勢補正手段が、前記レジストローラよりも用紙搬送方向の上流側で前記用紙を前記レジストローラに向かって搬送する互いに接触する一対の搬送ローラを備え、前記レジストローラを停止させた状態で、前記搬送ローラを回転させて前記用紙に形成するループ量を変更する、
ことを特徴とする請求項1記載の画像形成装置。 In a state in which the paper posture correction means includes a pair of conveyance rollers that contact each other to convey the paper toward the registration roller on the upstream side in the paper conveyance direction with respect to the registration roller, and the registration roller is stopped. Changing the amount of loop formed on the paper by rotating the transport roller;
The image forming apparatus according to claim 1. - コンピュータに、
用紙搬送手段によって搬送される用紙に画像を形成する画像形成機能と、
前記画像が形成された用紙を表裏反転して前記用紙搬送手段に搬送する再給紙搬送機能と、
印刷ジョブの印刷に係る前記用紙の属性を特定する特定機能と、
前記用紙の第1面に形成される前記画像の画像密度情報を取得する画像密度情報取得機能と、
前記画像形成手段よりも用紙搬送方向の上流側で互いに接触する一対のレジストローラに前記用紙が突き当てられてループが形成されることで前記用紙の姿勢を修正する用紙姿勢補正機能と、
用紙の両面に画像を形成する両面画像形成処理において、前記用紙の第2面に画像を形成する際には、前記用紙の用紙属性情報と前記用紙の第1面に形成される画像の画像密度に基づいて、前記用紙に形成するループ量を変更する機能と、
を実現するためのプログラム。 On the computer,
An image forming function for forming an image on a sheet conveyed by a sheet conveying unit;
A paper re-feed conveyance function for reversing the paper on which the image is formed and conveying it to the paper conveyance means;
A specific function for specifying the attribute of the paper related to printing of the print job;
An image density information acquisition function for acquiring image density information of the image formed on the first surface of the paper;
A paper attitude correction function that corrects the attitude of the paper by forming a loop by abutting the paper against a pair of registration rollers that are in contact with each other upstream of the image forming unit in the paper conveyance direction;
In a double-sided image forming process for forming an image on both sides of a sheet, when forming an image on the second side of the sheet, the sheet attribute information of the sheet and the image density of the image formed on the first side of the sheet A function to change the loop amount formed on the paper based on
Program to realize.
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US10054894B2 (en) | 2016-10-25 | 2018-08-21 | Konica Minolta, Inc. | Image forming apparatus |
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JPH1081434A (en) * | 1996-09-06 | 1998-03-31 | Canon Inc | Sheet material feeding device and image forming device provided with the sheet material feeding device |
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