JP2009149400A - Medium conveying device and image processing device - Google Patents

Medium conveying device and image processing device Download PDF

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JP2009149400A
JP2009149400A JP2007328232A JP2007328232A JP2009149400A JP 2009149400 A JP2009149400 A JP 2009149400A JP 2007328232 A JP2007328232 A JP 2007328232A JP 2007328232 A JP2007328232 A JP 2007328232A JP 2009149400 A JP2009149400 A JP 2009149400A
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medium
pair
conveying
member pair
transport
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Shoichi Maeda
祥一 前田
Michio Tada
通夫 多田
Naoto Otsuki
直人 大槻
Yoichi Yamakawa
洋一 山川
Hiroshi Iwasaka
啓 岩坂
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To mitigate negative effects such as medium torsion during correction of an end part position of a medium while securing medium forefront propulsion during medium skew correction. <P>SOLUTION: In a medium conveying device, a pair of first conveying members 11, a pair of second conveying members 12, and a pair of third conveying members 13 are provided sequentially from the upstream side of the medium conveying direction. The medium is conveyed toward the pair of third conveying members 13 which are in a stop state, and after butting the medium to the third conveying members 13, deflection is generated in the medium to correct the skew of the medium. In a state that the medium after the skew correction is gripped by the pair of third conveying members 13, an end part position of the medium is corrected by moving the pair of third conveying members 13 to a member shaft direction. At the time of correcting the skew of the medium, the pair of second conveying members 12 grip and convey the medium. At the time of correcting an end part position of the medium, a state of the pair of second conveying members 12 is switched so that the pair of second conveying members 12 may not grip the medium. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、媒体搬送装置および画像処理装置に関する。   The present invention relates to a medium conveying apparatus and an image processing apparatus.

複写機やプリンタ等のように記録用紙上への画像出力を行う画像形成装置や自動原稿送り装置を備えたスキャナのように原稿上からの画像読み取りを行う画像読取装置(以下、これらの装置を「画像処理装置」と総称する。)の中には、記録用紙や原稿等といった処理対象となる単票状(シート状)の媒体に対して、その斜行を補正する機能を備えたものがある。媒体の斜行は、当該媒体にループと呼ばれる撓みを生じさせて補正することが一般的である。すなわち、突き当て部材として機能する停止状態のレジロール対に媒体の先端を突き当て、斜行している当該媒体の先行側の端部が当該レジロール対への突き当てによって停止した後も、さらに上流側の搬送ロール対で媒体を送り込み、当該媒体に撓みを生じさせるとともに、遅延側の端部もレジロール対に突き当てることで、当該媒体の斜行を補正する(例えば、特許文献1参照)。
また、画像処理装置の中には、媒体の斜行を補正する機能に加えて、当該媒体の端部位置を補正する機能を備えたものもある。媒体の端部位置は、媒体に生じさせた撓みを利用して当該媒体の斜行を補正した後に、当該媒体をレジロール対で挟持し、その状態でレジロール対をロール軸方向に移動させることで行う(例えば、特許文献2参照)。
An image forming apparatus that outputs an image onto a recording sheet such as a copying machine or a printer, or an image reading apparatus that reads an image from an original such as a scanner equipped with an automatic document feeder (hereinafter referred to as these apparatuses). Some of them are collectively referred to as “image processing apparatus.” Some of them have a function of correcting the skew of a single-sheet (sheet-like) medium to be processed such as a recording sheet or a document. is there. In general, the skew of the medium is corrected by causing a bending called a loop in the medium. That is, even after the leading edge of the medium is abutted against the stopped registration roll pair that functions as an abutting member and the leading end of the skewed medium is stopped by the abutting against the registration roll pair, it is further upstream. The medium is fed by the pair of conveying rolls on the side, causing the medium to bend, and the end of the delay side also abuts against the pair of registration rolls, thereby correcting the skew of the medium (for example, see Patent Document 1).
Some image processing apparatuses have a function of correcting the edge position of the medium in addition to the function of correcting the skew of the medium. The position of the end of the medium is determined by correcting the skew of the medium using the bending generated in the medium, and then sandwiching the medium with the registration roll pair and moving the registration roll pair in the roll axis direction in that state. (For example, refer to Patent Document 2).

特開2004−123377号公報JP 2004-123377 A 特開2004−35196号公報Japanese Patent Laid-Open No. 2004-35196

媒体に生じさせた撓みを利用して当該媒体の斜行を補正するときには、レジロール対と搬送ロール対との間の媒体搬送経路を直線状にしたりロール間距離を小さくすると、レジロール対に媒体を突き当てる際の媒体先端の推進力を十分に確保することができる。
一方、レジロール対をロール軸方向に移動させて媒体の端部位置を補正するときには、レジロール対と搬送ロール対との間の距離を大きくすると、レジロール対のロール軸方向への移動によって生じる悪影響(媒体の捩じれ等)を緩和することができる。
このように、媒体の斜行補正と端部位置補正との両方を行う場合には、状況に応じてロール間距離を可変させ得ることが望ましい。しかしながら、レジロール対または搬送ロール対の配置位置を媒体搬送方向に沿って移動させることは、装置構成の複雑化を招いたり媒体搬送の信頼性が損なわれたりするおそれがあることから、必ずしも現実的ではない。
When correcting the skew of the medium by using the deflection generated in the medium, if the medium conveyance path between the registration roll pair and the conveyance roll pair is linear or the distance between the rolls is reduced, the medium is placed on the registration roll pair. A sufficient driving force at the front end of the medium can be ensured.
On the other hand, when correcting the edge position of the medium by moving the registration roll pair in the roll axis direction, if the distance between the registration roll pair and the transport roll pair is increased, an adverse effect caused by the movement of the registration roll pair in the roll axis direction ( It is possible to reduce the twist of the medium).
As described above, when both the skew correction and the end position correction of the medium are performed, it is desirable that the distance between the rolls can be varied according to the situation. However, it is not always realistic to move the arrangement position of the registration roll pair or the conveyance roll pair along the medium conveyance direction because it may cause a complicated configuration of the apparatus or impair the reliability of the medium conveyance. is not.

そこで、本発明は、媒体斜行補正の際の媒体先端推進力を確保しつつ、媒体の端部位置補正の際における媒体捩じれ等の悪影響を緩和することができ、しかもそのために装置構成の複雑化を招いたり媒体搬送の信頼性が損なわれたりすることのない媒体搬送装置および画像処理装置を提供することを目的とする。   Therefore, the present invention can alleviate the adverse effects such as twisting of the medium when correcting the edge position of the medium while ensuring the medium leading edge propulsion force when correcting the skew of the medium. It is an object of the present invention to provide a medium transport apparatus and an image processing apparatus that do not cause deterioration in the reliability of the medium transport.

請求項1に係る発明は、媒体を挟持して搬送する第一搬送部材対、第二搬送部材対および第三搬送部材対が当該媒体の搬送方向の上流側から順に配され、停止状態にある前記第三搬送部材対に向けて前記媒体を搬送し当該第三搬送部材対への突き当て後に当該媒体に撓みを生じさせて当該媒体の斜行を補正するとともに、斜行補正後の前記媒体を前記第三搬送部材対に挟持させた状態で当該第三搬送部材対を部材軸方向に移動させて当該媒体の端部位置を補正する媒体搬送装置において、前記媒体の斜行を補正するときには前記第二搬送部材対が当該媒体を挟持して搬送し、前記媒体の端部位置を補正するときには前記第二搬送部材対が当該媒体を挟持しないように、前記第二搬送部材対の状態切り換えを行うことを特徴とする媒体搬送装置である。
請求項2に係る発明は、前記第二搬送部材対の状態切り換えを行うか否かを、前記媒体の種類に応じて決定することを特徴とする請求項1記載の媒体搬送装置である。
請求項3に係る発明は、前記第二搬送部材対が前記媒体を挟持しない状態にある場合に、前記第一搬送部材対による当該媒体の搬送速度を前記第三搬送部材対による当該媒体の搬送速度よりも速くすることを特徴とする請求項1または2記載の媒体搬送装置である。
請求項4に係る発明は、前記第一搬送部材対による搬送速度を前記第三搬送部材対による搬送速度よりも速くするか否かを、前記媒体の種類に応じて決定することを特徴とする請求項4記載の媒体搬送装置である。
請求項5に係る発明は、媒体上への画像出力または媒体上からの画像読み取りを行う画像処理手段と、前記画像処理手段へ処理対象となる媒体を搬送する媒体搬送手段とを備え、前記媒体搬送手段は、媒体を挟持して搬送する第一搬送部材対、第二搬送部材対および第三搬送部材対が当該媒体の搬送方向の上流側から順に配され、停止状態にある前記第三搬送部材対に向けて前記媒体を搬送し当該第三搬送部材対への突き当て後に当該媒体に撓みを生じさせて当該媒体の斜行を補正するとともに、斜行補正後の前記媒体を前記第三搬送部材対に挟持させた状態で当該第三搬送部材対を部材軸方向に移動させて当該媒体の端部位置を補正するように構成されている画像処理装置において、前記媒体の斜行を補正するときには前記第二搬送部材対が当該媒体を挟持して搬送し、前記媒体の端部位置を補正するときには前記第二搬送部材対が当該媒体を挟持しないように、前記第二搬送部材対の状態切り換えを行うことを特徴とする画像処理装置である。
In the invention according to claim 1, the first transport member pair, the second transport member pair, and the third transport member pair that sandwich and transport the medium are arranged in order from the upstream side in the transport direction of the medium and are in a stopped state. The medium is conveyed toward the third conveying member pair, and the medium is bent after being abutted against the third conveying member pair to correct the skew of the medium, and the medium after the skew correction is performed. When correcting the skew of the medium in a medium transport apparatus that corrects the edge position of the medium by moving the third transport member pair in the member axial direction with the third transport member pair held between The state of the second transport member pair is switched so that the second transport member pair does not sandwich the medium when the second transport member pair sandwiches and transports the medium and corrects the end position of the medium. Media transport device characterized by A.
The invention according to claim 2 is the medium transport apparatus according to claim 1, wherein whether or not to switch the state of the second transport member pair is determined according to the type of the medium.
According to a third aspect of the present invention, when the second transport member pair is in a state of not sandwiching the medium, the transport speed of the medium by the first transport member pair is set to transport the medium by the third transport member pair. 3. The medium conveying apparatus according to claim 1, wherein the medium conveying apparatus is faster than the speed.
According to a fourth aspect of the present invention, it is determined according to the type of the medium whether or not the conveyance speed by the first conveyance member pair is faster than the conveyance speed by the third conveyance member pair. 5. A medium conveying apparatus according to claim 4.
The invention according to claim 5 is provided with an image processing means for outputting an image on a medium or reading an image from the medium, and a medium conveying means for conveying a medium to be processed to the image processing means. The transporting means includes the first transport member pair, the second transport member pair, and the third transport member pair that sandwich and transport the medium in order from the upstream side in the transport direction of the medium, and the third transport in a stopped state. The medium is transported toward the pair of members, and after being abutted against the third transport member pair, the medium is bent to correct the skew of the medium, and the medium after the skew correction is corrected to the third medium. In the image processing apparatus configured to correct the edge position of the medium by moving the third conveying member pair in the member axial direction while being sandwiched between the conveying member pair, the skew of the medium is corrected. When the second conveying member pair The second conveying member pair is switched so that the second conveying member pair does not hold the medium when the medium is nipped and conveyed and the end position of the medium is corrected. An image processing apparatus.

請求項1に係る発明および請求項5に係る発明によれば、第二搬送部材対が媒体を挟持すると、当該媒体を搬送する部材間距離は第二搬送部材対と第三搬送部材対との間の距離となるが、第二搬送部材対が媒体を挟持していないときには、当該媒体を搬送する部材間距離は第一搬送部材対と第三搬送部材対との間の距離となる。したがって、第二搬送部材対の状態切り換えを行うことで、状況に応じて部材間距離を可変させ得るようになるので、媒体斜行補正の際の媒体先端推進力を確保しつつ、媒体の端部位置補正の際における媒体捩じれ等の悪影響を緩和することができるようになる。しかも、第二搬送部材対による媒体を挟持/非挟持を切り換えればよいので、搬送部材対の配置位置を媒体搬送方向に沿って移動させる場合のように、装置構成の複雑化を招いたり媒体搬送の信頼性が損なわれたりすることがない。
請求項2に係る発明によれば、例えば、媒体捩じれ等の悪影響を受け易い媒体については、第二搬送部材対による媒体の挟持/非挟持切り換えを行うが、当該悪影響を受け難い媒体については、第二搬送部材対による媒体の挟持/非挟持切り換えを行わずに、第二搬送部材対が当該媒体を挟持したままとする、といったことが実現可能となる。
請求項3に係る発明によれば、第一搬送部材対と第三搬送部材対との間にて媒体に撓みが生じることになるので、第三搬送部材対の部材軸方向への移動による影響を当該撓みに吸収させることが可能となり、媒体の端部位置補正の際における媒体捩じれ等の悪影響の緩和を確実なものとすることができる。
請求項4に係る発明によれば、例えば、媒体捩じれ等の悪影響を受け易い媒体については、第一搬送部材対による媒体の搬送速度を速くするが、当該悪影響を受け難い媒体については、第一搬送部材対による媒体の搬送速度を第三搬送部材対による当該媒体の搬送速度と同じままとする、といったことが実現可能となる。
According to the invention according to claim 1 and the invention according to claim 5, when the second conveying member pair holds the medium, the distance between the members conveying the medium is the difference between the second conveying member pair and the third conveying member pair. When the second conveying member pair does not hold the medium, the distance between the members conveying the medium is the distance between the first conveying member pair and the third conveying member pair. Therefore, by switching the state of the second conveying member pair, the distance between the members can be varied according to the situation, so that the medium edge propulsive force is ensured during the medium skew correction and the end of the medium is secured. It is possible to mitigate adverse effects such as medium twist during the part position correction. In addition, since it is only necessary to switch between nipping and non-nipping the medium by the second conveying member pair, the configuration of the apparatus is complicated as in the case where the arrangement position of the conveying member pair is moved along the medium conveying direction. Transport reliability is not impaired.
According to the second aspect of the present invention, for example, for a medium that is susceptible to adverse effects such as twisting of the medium, the medium is pinched / unclamped by the second conveying member pair. It is possible to realize that the second conveying member pair holds the medium without performing the nipping / non-nipping switching of the medium by the second conveying member pair.
According to the third aspect of the invention, since the medium is bent between the first conveying member pair and the third conveying member pair, the influence of the movement of the third conveying member pair in the member axial direction is caused. Can be absorbed by the bending, and the adverse effects such as twisting of the medium during correction of the end position of the medium can be reliably reduced.
According to the fourth aspect of the present invention, for example, for a medium that is susceptible to adverse effects such as twisting of the medium, the medium conveyance speed is increased by the first conveying member pair. It becomes feasible that the conveyance speed of the medium by the conveyance member pair remains the same as the conveyance speed of the medium by the third conveyance member pair.

以下、図面に基づき本発明に係る媒体搬送装置および画像処理装置について説明する。   Hereinafter, a medium conveying apparatus and an image processing apparatus according to the present invention will be described with reference to the drawings.

先ず、画像処理装置の概略構成について説明する。   First, a schematic configuration of the image processing apparatus will be described.

図1は、画像処理装置の一例である画像形成装置の概略構成例を示す説明図である。
画像形成装置1は、記録用紙やOHPシート等といった単票状の媒体上に画像を形成して出力するものである。そのために、画像形成装置1は、媒体を収納する媒体収納部2と、媒体収納部2から繰り出した媒体の搬送を行う媒体搬送部3と、周知の電子写真技術を利用して形成されたトナー像を媒体搬送部3が搬送する媒体上へ転写する画像転写部4と、画像転写部4にて転写されたトナー像の媒体上への定着を行う画像定着部5と、画像定着後の媒体の排出を行う媒体排出部6と、を備えている。そして、媒体搬送部3には、画像転写部4による媒体上へのトナー像の転写位置よりも当該媒体の搬送方向上流側に、当該媒体の斜行(スキュー)および端部位置(サイドレジ)を補正するための媒体搬送補正部10が設けられている。
FIG. 1 is an explanatory diagram illustrating a schematic configuration example of an image forming apparatus which is an example of an image processing apparatus.
The image forming apparatus 1 forms and outputs an image on a single-cut medium such as recording paper or an OHP sheet. Therefore, the image forming apparatus 1 includes a medium storage unit 2 that stores a medium, a medium transfer unit 3 that transfers a medium fed out from the medium storage unit 2, and a toner that is formed using a known electrophotographic technique. An image transfer unit 4 that transfers an image onto a medium conveyed by the medium transfer unit 3, an image fixing unit 5 that fixes the toner image transferred by the image transfer unit 4 onto the medium, and a medium after image fixing A medium discharge unit 6 that discharges the medium. The medium transport unit 3 has a skew (skew) and an end position (side register) of the medium upstream of the transfer position of the toner image onto the medium by the image transfer unit 4 in the transport direction of the medium. A medium conveyance correction unit 10 for correction is provided.

なお、画像処理装置としては、上述した構成の画像形成装置1の他にも、画像読取装置が挙げられる。画像読取装置は、原稿となる媒体から当該媒体上に描かれた画像を光学的に読み取るとともに、読み取り対象となる媒体の自動原稿送りを行い得るものである。このような画像読取装置においても、媒体の自動原稿送りを行う際の媒体搬送路には、画像読み取り位置よりも媒体の搬送方向上流側に、当該媒体の斜行(スキュー)および端部位置(サイドレジ)を補正するための媒体搬送補正部が設けられているものとする。   Examples of the image processing apparatus include an image reading apparatus in addition to the image forming apparatus 1 configured as described above. The image reading apparatus optically reads an image drawn on a medium serving as a document and can automatically feed a document to be read. Also in such an image reading apparatus, the skew of the medium (skew) and the end position (on the upstream side in the medium transport direction from the image reading position on the medium transport path when automatic document feeding of the medium is performed. It is assumed that a medium conveyance correction unit for correcting the side registration) is provided.

続いて、以上のような画像形成装置1または画像読取装置における媒体搬送補正部10、すなわち本発明に係る媒体搬送装置の要部について詳しく説明する。   Next, the medium conveyance correction unit 10 in the image forming apparatus 1 or the image reading apparatus as described above, that is, the main part of the medium conveyance apparatus according to the present invention will be described in detail.

図2は、媒体搬送補正部10の概略構成例を示す説明図である。
図例のように、媒体搬送補正部10は、媒体搬送部3における媒体の搬送方向(図中矢印A参照)の上流側から搬送ロール対11、プレレジロール対12およびレジロール対13が順に配されており、これらの各ロール対11〜13が媒体搬送路14によって案内される媒体を挟持して搬送するように構成されている。すなわち、これらの各ロール対11〜13は、それぞれが本発明における第一搬送部材対、第二搬送部材対および第三搬送部材対として機能するようになっている。
FIG. 2 is an explanatory diagram illustrating a schematic configuration example of the medium conveyance correction unit 10.
As shown in the figure, the medium conveyance correcting unit 10 includes a conveyance roll pair 11, a pre-registration roll pair 12, and a registration roll pair 13 in order from the upstream side in the medium conveyance direction (see arrow A in the figure) in the medium conveyance unit 3. These roll pairs 11 to 13 are configured to sandwich and convey the medium guided by the medium conveyance path 14. That is, each of these roll pairs 11-13 functions as a first transport member pair, a second transport member pair, and a third transport member pair in the present invention.

また、媒体搬送補正部10は、レジロール対13によって送られる媒体の端部位置を検知する端部検知部15と、レジロール対13をロール軸方向に移動させる軸方向移動部16と、プレレジロール対12の状態切り換えを行うニップ切換部17と、これらの各部15〜17および各ロール対11〜13の駆動動作を制御する動作制御部18と、画像形成装置1における動作モードを認識するモード認識部19と、を備えている。そして、動作制御部18によるプレレジロール対12およびレジロール対13に対する動作制御を通じて媒体搬送路14に案内される媒体の斜行を補正するとともに、動作制御部18によるレジロール対13および軸方向移動部16に対する動作制御を通じて媒体の端部位置を補正するように構成されている。   The medium conveyance correcting unit 10 also includes an end detection unit 15 that detects the end position of the medium that is sent by the registration roll pair 13, an axial movement unit 16 that moves the registration roll pair 13 in the roll axis direction, and a pre-registration roll pair. A nip switching unit 17 that performs 12 state switching, an operation control unit 18 that controls the driving operation of each of these units 15 to 17 and each roll pair 11 to 13, and a mode recognition unit that recognizes an operation mode in the image forming apparatus 1. 19. Then, the skew of the medium guided to the medium transport path 14 is corrected through the operation control on the pre-registration roll pair 12 and the registration roll pair 13 by the operation control unit 18, and the registration roll pair 13 and the axial movement unit 16 by the operation control unit 18 are corrected. The position of the edge of the medium is corrected through the operation control for.

このような構成の媒体搬送補正部10では、搬送ロール対11、プレレジロール対12およびレジロール対13を回転駆動する駆動源(ただし不図示)、並びに、軸方向移動部16およびニップ切換部17が、動作制御部18からの制御指示に従いつつ動作することで、以下に述べるような一連の処理動作が行われることになる。   In the medium conveyance correcting unit 10 having such a configuration, a driving source (not shown) that rotationally drives the conveyance roll pair 11, the pre-registration roll pair 12, and the registration roll pair 13, an axial movement unit 16, and a nip switching unit 17 are provided. By operating according to the control instruction from the operation control unit 18, a series of processing operations as described below are performed.

図3は、媒体の斜行補正の概要を示す説明図である。
媒体搬送補正部10は、搬送する媒体Pに撓みを生じさせて、当該媒体Pの斜行を補正する。具体的には、図3(a)に示すように、停止状態にあるレジロール対13に向けて、プレレジロール対12が媒体Pを搬送する。そして、媒体Pの先端がレジロール対13に突き当たった後も、さらにプレレジロール対12が当該媒体Pを挟持搬送してレジロール対13の側へ送り込む。これにより、プレレジロール対12とレジロール対13との間では、図3(b)に示すように、媒体搬送路14の撓み生成用空間14aにて、媒体Pに撓みが生じることになる。すなわち、斜行した状態で搬送される媒体Pの先行側の端部がレジロール対13に突き当たった後、当該媒体Pに撓みが生じるとともに、当該媒体Pの遅延側の端部もレジロール対13に突き当たることになる。このようにして、媒体搬送補正部10は、媒体Pの斜行を補正するのである。
なお、媒体の斜行を補正した後は、レジロール対13が画像転写部4の動作タイミングに合わせて回転動作を開始し、媒体Pを搬送方向下流側に向けて挟持搬送するようになっている。
FIG. 3 is an explanatory diagram showing an outline of the skew correction of the medium.
The medium conveyance correction unit 10 causes the medium P to be conveyed to bend and correct the skew of the medium P. Specifically, as shown in FIG. 3A, the pre-registration roll pair 12 transports the medium P toward the registration roll pair 13 in a stopped state. Even after the leading edge of the medium P hits the registration roll pair 13, the pre-registration roll pair 12 sandwiches and conveys the medium P and sends it to the registration roll pair 13 side. As a result, the medium P is bent between the pre-registration roll pair 12 and the registration roll pair 13 in the bending generation space 14a of the medium transport path 14 as shown in FIG. That is, after the leading end of the medium P conveyed in a skewed state hits the registration roll pair 13, the medium P bends and the delay side end of the medium P also moves to the registration roll pair 13. You will be hit. In this way, the medium transport correction unit 10 corrects the skew of the medium P.
After correcting the skew of the medium, the registration roll pair 13 starts rotating in accordance with the operation timing of the image transfer unit 4, and the medium P is nipped and conveyed toward the downstream side in the conveyance direction. .

図4は、媒体の端部位置補正の概要を示す説明図である。
媒体搬送補正部10は、斜行補正後の媒体Pをレジロール対13に挟持させた状態で、当該レジロール対13をロール軸方向に移動させることで、当該媒体Pの端部位置を補正する。具体的には、図4に示すように、斜行補正後の媒体Pがレジロール対13に挟持搬送されて媒体搬送方向(図中矢印A参照)に沿って送られると、その媒体Pの端部位置をCCDセンサ等からなる端部検知部15が検知する。そして、端部検知部15が媒体Pの端部位置を検知すると、その検知結果に基づき、端部検知部15が検知した端部位置と本来あるべき端部位置(画像形成が正しく行われる位置)との差分だけ、モータ等の駆動源やラックピニオン等のギヤ機構の組み合わせからなる軸方向移動部16が、レジロール対13をロール軸方向(図中矢印B参照)に移動させる。このようにして、媒体搬送補正部10は、媒体Pの端部位置の補正を行うのである。
FIG. 4 is an explanatory diagram showing an outline of medium edge position correction.
The medium transport correction unit 10 corrects the end position of the medium P by moving the registration roll pair 13 in the roll axis direction while the skew correction medium P is held between the registration roll pair 13. Specifically, as shown in FIG. 4, when the skew-corrected medium P is nipped and conveyed by the registration roll pair 13 and sent along the medium conveyance direction (see arrow A in the figure), the end of the medium P The edge detection unit 15 including a CCD sensor or the like detects the position of the part. When the end detection unit 15 detects the end position of the medium P, based on the detection result, the end position detected by the end detection unit 15 and the end position that should be originally (position where image formation is correctly performed). )), The axial movement unit 16 composed of a combination of a drive source such as a motor and a gear mechanism such as a rack and pinion moves the registration roll pair 13 in the roll axial direction (see arrow B in the figure). In this way, the medium conveyance correction unit 10 corrects the end position of the medium P.

ところで、図3を用いて説明したように、媒体Pに生じた撓みを利用して当該媒体Pの斜行を補正する場合には、プレレジロール対12とレジロール対13との間の経路を直線状にしたり距離を小さくすると、レジロール対13に媒体Pを突き当てる際の推進力が十分に確保されることになる。そのため、媒体搬送補正部10では、プレレジロール対12とレジロール対13との間の媒体搬送路14が直線状に形成されており、またプレレジロール対12とレジロール対13との間の距離が、斜行の補正に必要な媒体Pの撓み量を確保し得る範囲で小さくなるように設定されている。
その一方で、図4を用いて説明したように、レジロール対13のロール軸方向への移動を利用して媒体Pの端部位置を補正する場合には、当該レジロール対13の移動によって生じる媒体Pへの悪影響(媒体の捩じれ等)を緩和するために、プレレジロール対12とレジロール対13との間の距離を大きくすべきである。また、これらの間の媒体搬送路14に湾曲部分を含んでいると、その湾曲部分に沿うように媒体Pにも撓み部分が生じることになるので、当該部分が媒体Pへの悪影響緩和に寄与することになる。つまり、斜行補正を考慮した距離および搬送経路の設定とは相反する。
By the way, as described with reference to FIG. 3, when the skew of the medium P is corrected using the deflection generated in the medium P, the path between the pre-registration roll pair 12 and the registration roll pair 13 is a straight line. When the shape is reduced or the distance is reduced, a sufficient driving force is ensured when the medium P is abutted against the registration roll pair 13. Therefore, in the medium conveyance correction unit 10, the medium conveyance path 14 between the pre-registration roll pair 12 and the registration roll pair 13 is formed in a straight line, and the distance between the pre-registration roll pair 12 and the registration roll pair 13 is It is set to be small within a range in which the amount of deflection of the medium P necessary for skew correction can be secured.
On the other hand, as described with reference to FIG. 4, when the end position of the medium P is corrected using the movement of the registration roll pair 13 in the roll axis direction, the medium generated by the movement of the registration roll pair 13. In order to mitigate adverse effects on P (such as twisting of the medium), the distance between the pre-registration roll pair 12 and the registration roll pair 13 should be increased. In addition, if the medium conveyance path 14 between them includes a curved portion, a bent portion is also generated in the medium P along the curved portion, so that the portion contributes to alleviating adverse effects on the medium P. Will do. That is, it is contrary to the setting of the distance and the conveyance path considering the skew correction.

このことから、媒体搬送補正部10では、その特徴的な構成として、プレレジロール対12の状態切り換えを行うニップ切換部17を備えており、そのニップ切換部17が動作制御部18からの制御指示に従いつつ、プレレジロール対12が媒体Pを挟持搬送する状態と、当該プレレジロール対12が媒体Pを挟持しない状態とを、選択的に切り換えるようになっている。なお、挟持状態/非挟持状態の切り換えは、例えば電磁ソレノイド等の駆動源とこれに連結するリンク機構等を用いて行うといったように、公知の手法を利用して実現すればよい。   Therefore, the medium transport correcting unit 10 includes a nip switching unit 17 that switches the state of the pre-registration roll pair 12 as a characteristic configuration. The nip switching unit 17 controls the operation from the operation control unit 18. The pre-registration roll pair 12 is selectively switched between a state in which the pre-registration roll pair 12 sandwiches and conveys the medium P and a state in which the pre-registration roll pair 12 does not sandwich the medium P. The switching between the clamping state and the non-clamping state may be realized using a known method, for example, using a drive source such as an electromagnetic solenoid and a link mechanism connected to the driving source.

図5は、挟持状態/非挟持状態の切り換えの概要を示す説明図である。
媒体搬送補正部10では、媒体搬送部3が媒体Pの搬送動作を開始すると、図5(a)に示すように、プレレジロール対12が当該媒体Pを挟持して搬送する状態となるように、動作制御部18がニップ切換部17に対して動作制御指示を与える。この指示を受けて、ニップ切換部17は、プレレジロール対12が非挟持状態にあれば挟持状態への切り換えを行い、プレレジロール対12が挟持状態にあればその状態を維持する。これにより、媒体搬送補正部10において、媒体Pの斜行を補正するときには、当該媒体Pがプレレジロール対12に挟持搬送されて、その線端がレジロール対13に突き当てられることになる。すなわち、媒体Pの斜行補正時におけるロール対間距離は、プレレジロール対12とレジロール対13とによって特定される(図中距離C参照)。
FIG. 5 is an explanatory diagram showing an overview of switching between the clamping state and the non-clamping state.
In the medium conveyance correcting unit 10, when the medium conveyance unit 3 starts the conveyance operation of the medium P, as shown in FIG. 5A, the pre-registration roll pair 12 is in a state of nipping and conveying the medium P. The operation control unit 18 gives an operation control instruction to the nip switching unit 17. In response to this instruction, the nip switching unit 17 switches to the clamping state if the pre-registration roll pair 12 is in the non-clamping state, and maintains that state if the pre-registration roll pair 12 is in the clamping state. As a result, when the medium conveyance correcting unit 10 corrects the skew of the medium P, the medium P is nipped and conveyed by the pre-registration roll pair 12, and the line end is abutted against the registration roll pair 13. That is, the distance between the roll pairs at the time of skew correction of the medium P is specified by the pre-registration roll pair 12 and the registration roll pair 13 (see the distance C in the figure).

その後、媒体搬送補正部10では、レジロール対13が画像転写部4の動作タイミングに合わせて回転動作を開始すると、遅くとも媒体Pの端部位置補正のために軸方向移動部16がレジロール対13をロール軸方向への移動を開始するまでに、図5(b)に示すように、プレレジロール対12が当該媒体Pを挟持しない状態となるように、動作制御部18がニップ切換部17に対して動作制御指示を与える。この指示を受けて、ニップ切換部17は、プレレジロール対12が非挟持状態となるように状態切り換えを行う。具体的には、ロール軸の軸間距離が離間するように、いずれか一方または両方のロール軸位置を移動させる。これにより、媒体搬送補正部10において、媒体Pの端部を補正するときには、当該媒体Pがプレレジロール対12には挟持されず、搬送ロール対11とレジロール対13とによって挟持された状態で、当該補正が行われることになる。すなわち、媒体Pの端部位置補正時におけるロール対間距離は、搬送ロール対11とレジロール対13とによって特定される(図中距離D参照)。   Thereafter, in the medium conveyance correction unit 10, when the registration roll pair 13 starts rotating in accordance with the operation timing of the image transfer unit 4, the axial movement unit 16 moves the registration roll pair 13 at the latest to correct the end position of the medium P. Before the movement in the roll axis direction starts, the operation control unit 18 controls the nip switching unit 17 so that the pre-registration roll pair 12 does not hold the medium P as shown in FIG. To give motion control instructions. In response to this instruction, the nip switching unit 17 performs state switching so that the pre-registration roll pair 12 is in a non-nip state. Specifically, one or both of the roll shaft positions are moved so that the distance between the roll shafts is separated. Thus, when the medium conveyance correction unit 10 corrects the end of the medium P, the medium P is not sandwiched between the pre-registration roll pair 12 but is sandwiched between the conveyance roll pair 11 and the registration roll pair 13. The correction is performed. That is, the distance between the roll pairs at the time of correcting the end position of the medium P is specified by the transport roll pair 11 and the registration roll pair 13 (see the distance D in the figure).

このように、媒体搬送補正部10では、ニップ切換部17がプレレジロール対12の状態切り換えを行うことで、状況に応じてロール対間距離を可変させ得るようになる。しかも、搬送経路に湾曲部分を含むか否かについても、切り換え得るようになる。したがって、当該距離の可変を通じて、上述した相反する距離設定および搬送経路設定の両立が図れるようになる。   As described above, in the medium conveyance correction unit 10, the nip switching unit 17 switches the state of the pre-registration roll pair 12, so that the distance between the roll pairs can be varied according to the situation. In addition, it is possible to switch whether or not the conveyance path includes a curved portion. Therefore, the above-described conflicting distance setting and conveyance path setting can be achieved through the variable distance.

なお、ニップ切換部17は、非挟持状態としたプレレジロール対12について、端部位置を補正した媒体Pの後端が当該プレレジロール対12を通過した後から、次の媒体Pの先端が当該プレレジロール対12に到達するまでの間に、挟持状態への切り換えを行っておき、当該次の媒体Pの搬送に備えるようにする。   Note that the nip switching unit 17 is configured so that the front end of the next medium P after the rear end of the medium P whose end position is corrected passes through the pair of pre-registration rolls 12 in the non-nipping state. Before reaching the pre-registration roll pair 12, switching to the nipping state is performed to prepare for the conveyance of the next medium P.

このようなプレレジロール対12の挟持/非挟持の状態切り換えは、搬送対象となる媒体Pのそれぞれについて個別に行われるものとする。ただし、必ずしも全ての媒体Pに対して個別に行う必要はない。
例えば、厚さや坪量等が大きい媒体Pは、これらが小さいものに比べて剛性が高く、媒体捩じれ等の悪影響を受け易い傾向にある。これに対して、厚さや坪量等が小さい媒体Pは、これらが大きいものに比べて柔軟性に富み、媒体捩じれ等の悪影響を受け難い傾向にある。また、媒体搬送方向の大きさが小さい媒体Pは、当該大きさが大きいものに比べて剛性が高く、媒体捩じれ等の悪影響を受け易い傾向にある。これに対して、媒体搬送方向の大きさが大きい媒体Pは、当該大きさが小さいものに比べて柔軟性に富み、媒体捩じれ等の悪影響を受け難い傾向にある。
したがって、プレレジロール対12の状態切り換えを行うか否かについては、搬送対象となる媒体Pの厚さ、坪量、媒体搬送方向の大きさ等に応じて、決定することも考えられる。すなわち、当該媒体Pの種類別に、プレレジロール対12の状態切り換えを行うか否かを決定するのである。
It is assumed that the state switching between the pre-registration roll pair 12 is performed individually for each medium P to be transported. However, it is not always necessary to carry out individually for all the media P.
For example, the medium P having a large thickness, basis weight, etc. has a higher rigidity than those having a small thickness, and tends to be adversely affected by the twisting of the medium. On the other hand, the medium P having a small thickness, basis weight or the like is more flexible than those having a large thickness and tends not to be adversely affected by the twisting of the medium. Further, the medium P having a small size in the medium transport direction has higher rigidity than that having a large size, and tends to be adversely affected by twisting of the medium. On the other hand, the medium P having a large size in the medium conveyance direction is more flexible than a medium having a small size, and tends not to be adversely affected by twisting of the medium.
Therefore, whether or not to switch the state of the pre-registration roll pair 12 may be determined according to the thickness, basis weight, size in the medium transport direction, and the like of the medium P to be transported. That is, it is determined whether or not to switch the state of the pre-registration roll pair 12 for each type of the medium P.

具体的には、画像形成装置1のユーザインタフェース部からのモード設定を基に、モード認識部19が当該画像形成装置1における動作モードを認識して、搬送対象となる媒体Pの種類を特定する。モード認識部19が媒体Pの種類を特定すると、続いて、動作制御部18は、当該種類における媒体厚さ、坪量、媒体搬送方向の大きさ等の値を予め設定されている閾値と比較したり、あるいは当該種類と切り換え動作可否との対応関係が予め設定されている情報テーブルを参照したりして、当該種類の媒体Pの搬送にあたり、プレレジロール対12の状態切り換えを行うか否かを決定する。このような動作制御処理を経ることで、媒体搬送補正部10では、例えば、媒体Pの厚さまたは坪量の少なくとも一方が大きいか、または媒体搬送方向の大きさが小さい場合については、上述したようなプレレジロール対12の状態切り換えを行うが、厚さおよび坪量のいずれもが小さく、かつ、媒体搬送方向の大きさが大きい場合については、プレレジロール対12による媒体Pの挟持/非挟持切り換えを行わずに、プレレジロール対12が当該媒体Pを挟持したままとする、といったことを行う。
なお、ここでは、媒体Pの種類が厚さ、坪量、媒体搬送方向の大きさ等によって区別される場合を例に挙げたが、当該種類の別を特定する項目の内容についても、また状態切り換えを行うか否かの判断基準(どの項目について判断し、その判断にどのような閾値を用いるか等)についても、予め設定されていればよく、特に限定されるものではない。
Specifically, based on the mode setting from the user interface unit of the image forming apparatus 1, the mode recognition unit 19 recognizes the operation mode in the image forming apparatus 1 and specifies the type of medium P to be transported. . When the mode recognizing unit 19 specifies the type of the medium P, the operation control unit 18 subsequently compares values such as the medium thickness, the basis weight, and the size in the medium transport direction with respect to the type with a preset threshold value. Whether or not the state of the pair of pre-registration rolls 12 is switched when the medium P is transported by referring to an information table in which the correspondence between the type and the switching operation availability is set in advance. To decide. By performing such an operation control process, the medium transport correction unit 10 has described above, for example, when at least one of the thickness and the basis weight of the medium P is large or the size in the medium transport direction is small. When the state of the pre-registration roll pair 12 is switched as described above, when both the thickness and the basis weight are small and the size in the medium transport direction is large, the medium P is sandwiched / not pinched by the pre-registration roll pair 12 The pre-registration roll pair 12 keeps the medium P sandwiched without switching.
In addition, although the case where the type of the medium P is distinguished by the thickness, the basis weight, the size in the medium conveyance direction, and the like has been described as an example here, the content of the item specifying the type is also in the state The criterion for determining whether or not to perform switching (which item is to be determined and what threshold is to be used for the determination) may be set in advance and is not particularly limited.

また、プレレジロール対12が非挟持状態となるように、ニップ切換部17が状態切り換えを行った場合には、以下に述べるような動作制御処理を行うことも考えられる。
図6は、非挟持状態における動作制御処理例の概要を示す説明図である。
図例の媒体搬送補正部10では、プレレジロール対12が媒体Pを挟持しない状態にある場合に、搬送ロール対11による当該媒体の搬送速度(図中距離E参照)を、レジロール対13による当該媒体Pの搬送速度(図中距離F参照)よりも速くするようになっている。その場合の速度差については、各ロール対間の距離や媒体搬送経路の形状等に応じて予め設定されていればよく、その大きさが特に限定されるものではない。
In addition, when the nip switching unit 17 performs state switching so that the pre-registration roll pair 12 is in a non-clamping state, an operation control process as described below may be performed.
FIG. 6 is an explanatory diagram showing an outline of an example of the operation control process in the non-clamping state.
In the medium conveyance correction unit 10 in the illustrated example, when the pre-registration roll pair 12 is in a state where the medium P is not sandwiched, the conveyance speed of the medium by the conveyance roll pair 11 (see the distance E in the figure) The speed is higher than the conveyance speed of the medium P (see the distance F in the figure). The speed difference in that case may be set in advance according to the distance between each pair of rolls, the shape of the medium conveyance path, and the like, and the size is not particularly limited.

このような動作制御処理を行えば、プレレジロール対12が媒体Pを挟持せず、当該媒体Pが搬送ロール対11とレジロール対13とによって挟持されて搬送される場合に、レジロール対13による単位時間あたりの媒体搬送量よりも搬送ロール対11による単位時間あたりの媒体搬送量のほうが大きくなるので、搬送ロール対11とレジロール対13との間にて当該媒体Pに撓みが生じることになる。さらに詳しくは、斜行補正のために媒体Pに生じた撓みについて、当該媒体Pが搬送されるのに伴い、その撓み量が大きくなる。したがって、レジロール対13のロール軸方向への移動による影響が、媒体Pに生じた当該撓みによって吸収されることになる。   When such an operation control process is performed, when the pre-registration roll pair 12 does not sandwich the medium P, and the medium P is sandwiched and transported by the transport roll pair 11 and the registration roll pair 13, the unit by the registration roll pair 13 is used. Since the medium conveyance amount per unit time by the conveyance roll pair 11 is larger than the medium conveyance amount per time, the medium P is bent between the conveyance roll pair 11 and the registration roll pair 13. More specifically, the amount of bending of the medium P due to skew correction increases as the medium P is conveyed. Therefore, the influence of the movement of the registration roll pair 13 in the roll axis direction is absorbed by the deflection generated in the medium P.

このような各ロール対11,13の速度制御についても、当該速度制御を行うか否かを、搬送対象となる媒体Pの種類に応じて決定することが考えられる。具体的には、画像形成装置1のユーザインタフェース部からのモード設定を基に、モード認識部19が当該画像形成装置1における動作モードを認識して、搬送対象となる媒体Pの種類を特定する。モード認識部19が媒体Pの種類を特定すると、続いて、動作制御部18は、当該種類における媒体厚さ、坪量、媒体搬送方向の大きさ等の値を予め設定されている閾値と比較したり、あるいは当該種類と速度制御要否との対応関係が予め設定されている情報テーブルを参照したりして、当該種類の媒体Pの搬送にあたり、各ロール対11,13の速度制御を行うか否かを決定する。このような動作制御処理を経ることで、媒体搬送補正部10では、例えば、媒体Pの厚さまたは坪量の少なくとも一方が大きいか、または媒体搬送方向の大きさが小さい場合については、上述したような各ロール対11,13の速度制御を行うが、厚さおよび坪量のいずれもが小さく、かつ、媒体搬送方向の大きさが大きい場合については、各ロール対11,13による媒体Pの搬送速度と同じままとする、といったことを行う。
なお、ここでも、媒体Pの種類が厚さ、坪量、媒体搬送方向の大きさ等によって区別される場合を例に挙げたが、当該種類の別を特定する項目の内容についても、また速度制御を行うか否かの判断基準(どの項目について判断し、その判断にどのような閾値を用いるか等)についても、予め設定されていればよく、特に限定されるものではない。
With regard to the speed control of each of the roll pairs 11 and 13 as described above, it is conceivable to determine whether or not to perform the speed control according to the type of the medium P to be transported. Specifically, based on the mode setting from the user interface unit of the image forming apparatus 1, the mode recognition unit 19 recognizes the operation mode in the image forming apparatus 1 and specifies the type of medium P to be transported. . When the mode recognizing unit 19 specifies the type of the medium P, the operation control unit 18 subsequently compares values such as the medium thickness, the basis weight, and the size in the medium transport direction with respect to the type with a preset threshold value. Or by referring to an information table in which the correspondence between the type and necessity of speed control is set in advance, the speed control of each pair of rolls 11 and 13 is performed when transporting the medium P of the type. Determine whether or not. By performing such an operation control process, the medium transport correction unit 10 has described above, for example, when at least one of the thickness and the basis weight of the medium P is large or the size in the medium transport direction is small. The speed control of each of the roll pairs 11 and 13 is performed. When the thickness and the basis weight are both small and the size in the medium transport direction is large, the medium P of each roll pair 11 and 13 is controlled. The same as the conveyance speed is performed.
Here, the case where the type of the medium P is distinguished by the thickness, the basis weight, the size in the medium conveyance direction, and the like has been described as an example. The criterion for determining whether or not to perform control (which item is to be determined and what threshold is to be used for the determination) may be set in advance and is not particularly limited.

以上に説明した実施形態では、本発明の好適な実施具体例について説明したが、本発明はその内容に限定されるものではなく、その要旨を逸脱しない範囲で適宜変更することが可能である。
例えば、本実施形態で例に挙げた媒体搬送路14の形状や当該媒体搬送路14における撓み生成用空間14aの位置等は一具体例に過ぎず、画像形成装置1における媒体搬送部3や画像転写部4等の配置に応じて適宜変更可能であることは勿論である。
In the embodiments described above, preferred specific examples of the present invention have been described. However, the present invention is not limited to the contents, and can be appropriately changed without departing from the gist thereof.
For example, the shape of the medium conveyance path 14 and the position of the bending generation space 14a in the medium conveyance path 14 exemplified in the present embodiment are merely specific examples, and the medium conveyance unit 3 and the image in the image forming apparatus 1 are merely examples. Of course, it can be appropriately changed according to the arrangement of the transfer section 4 and the like.

画像処理装置の一例である画像形成装置の概略構成例を示す説明図である。1 is an explanatory diagram illustrating a schematic configuration example of an image forming apparatus that is an example of an image processing apparatus. FIG. 本発明が適用された媒体搬送補正部の概略構成例を示す説明図である。It is explanatory drawing which shows the schematic structural example of the medium conveyance correction | amendment part to which this invention was applied. 図2の媒体搬送補正部による媒体の斜行補正の概要を示す説明図である。FIG. 3 is an explanatory diagram showing an outline of medium skew correction by a medium conveyance correction unit in FIG. 2. 図2の媒体搬送補正部による媒体の端部位置補正の概要を示す説明図である。FIG. 3 is an explanatory diagram illustrating an outline of medium edge position correction by a medium conveyance correction unit in FIG. 2. 図2の媒体搬送補正部における媒体の挟持状態/非挟持状態の切り換えの概要を示す説明図である。FIG. 4 is an explanatory diagram showing an outline of switching between a medium holding state and a non-nipping state in the medium conveyance correction unit in FIG. 2. 図2の媒体搬送補正部の媒体非挟持状態における動作制御処理例の概要を示す説明図である。FIG. 4 is an explanatory diagram illustrating an outline of an example of an operation control process in a medium non-nipping state of the medium conveyance correcting unit in FIG.

符号の説明Explanation of symbols

1…画像形成装置、2…媒体収納部、3…媒体搬送部、4…画像転写部、5…画像定着部、6…媒体排出部、10…媒体搬送補正部、11…搬送ロール対、12…プレレジロール対、13…レジロール対13、14…媒体搬送路、14a…撓み生成用空間、15…端部検知部、16…軸方向移動部、17…ニップ切換部、18…動作制御部、19…モード認識部、P…媒体   DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 2 ... Medium storage part, 3 ... Medium conveyance part, 4 ... Image transfer part, 5 ... Image fixing part, 6 ... Medium discharge part, 10 ... Medium conveyance correction part, 11 ... Conveyance roll pair, 12 ... Pre-registration roll pair, 13 ... Registration roll pair 13, 14 ... Medium transport path, 14a ... Deflection generating space, 15 ... End detection section, 16 ... Axial movement section, 17 ... Nip switching section, 18 ... Operation control section, 19: Mode recognition unit, P: Medium

Claims (5)

媒体を挟持して搬送する第一搬送部材対、第二搬送部材対および第三搬送部材対が当該媒体の搬送方向の上流側から順に配され、停止状態にある前記第三搬送部材対に向けて前記媒体を搬送し当該第三搬送部材対への突き当て後に当該媒体に撓みを生じさせて当該媒体の斜行を補正するとともに、斜行補正後の前記媒体を前記第三搬送部材対に挟持させた状態で当該第三搬送部材対を部材軸方向に移動させて当該媒体の端部位置を補正する媒体搬送装置において、
前記媒体の斜行を補正するときには前記第二搬送部材対が当該媒体を挟持して搬送し、前記媒体の端部位置を補正するときには前記第二搬送部材対が当該媒体を挟持しないように、前記第二搬送部材対の状態切り換えを行う
ことを特徴とする媒体搬送装置。
A first transport member pair, a second transport member pair, and a third transport member pair that sandwich and transport the medium are arranged in order from the upstream side in the transport direction of the medium, toward the third transport member pair that is in a stopped state. After the medium is conveyed and abutted against the third conveying member pair, the medium is bent to correct the skew of the medium, and the medium after the skew correction is corrected to the third conveying member pair. In the medium conveying apparatus that corrects the end position of the medium by moving the third conveying member pair in the member axial direction in a sandwiched state,
When correcting the skew of the medium, the second conveying member pair holds and conveys the medium, and when correcting the end position of the medium, the second conveying member pair does not hold the medium. The medium conveying apparatus, wherein the state of the second conveying member pair is switched.
前記第二搬送部材対の状態切り換えを行うか否かを、前記媒体の種類に応じて決定する
ことを特徴とする請求項1記載の媒体搬送装置。
The medium conveying apparatus according to claim 1, wherein whether or not to switch the state of the second conveying member pair is determined according to the type of the medium.
前記第二搬送部材対が前記媒体を挟持しない状態にある場合に、前記第一搬送部材対による当該媒体の搬送速度を前記第三搬送部材対による当該媒体の搬送速度よりも速くする
ことを特徴とする請求項1または2記載の媒体搬送装置。
When the second conveying member pair is not in the state of sandwiching the medium, the medium conveying speed by the first conveying member pair is made faster than the medium conveying speed by the third conveying member pair. The medium carrying device according to claim 1 or 2.
前記第一搬送部材対による搬送速度を前記第三搬送部材対による搬送速度よりも速くするか否かを、前記媒体の種類に応じて決定する
ことを特徴とする請求項4記載の媒体搬送装置。
The medium conveying apparatus according to claim 4, wherein whether or not the conveying speed by the first conveying member pair is faster than the conveying speed by the third conveying member pair is determined according to the type of the medium. .
媒体上への画像出力または媒体上からの画像読み取りを行う画像処理手段と、
前記画像処理手段へ処理対象となる媒体を搬送する媒体搬送手段とを備え、
前記媒体搬送手段は、媒体を挟持して搬送する第一搬送部材対、第二搬送部材対および第三搬送部材対が当該媒体の搬送方向の上流側から順に配され、停止状態にある前記第三搬送部材対に向けて前記媒体を搬送し当該第三搬送部材対への突き当て後に当該媒体に撓みを生じさせて当該媒体の斜行を補正するとともに、斜行補正後の前記媒体を前記第三搬送部材対に挟持させた状態で当該第三搬送部材対を部材軸方向に移動させて当該媒体の端部位置を補正するように構成されている画像処理装置において、
前記媒体の斜行を補正するときには前記第二搬送部材対が当該媒体を挟持して搬送し、前記媒体の端部位置を補正するときには前記第二搬送部材対が当該媒体を挟持しないように、前記第二搬送部材対の状態切り換えを行う
ことを特徴とする画像処理装置。
Image processing means for outputting an image on a medium or reading an image from the medium;
Medium conveying means for conveying a medium to be processed to the image processing means,
The medium transport means includes a first transport member pair, a second transport member pair, and a third transport member pair that sandwich and transport the medium in order from the upstream side in the transport direction of the medium, and are in a stopped state. The medium is conveyed toward the three conveying member pairs, and the medium is bent after being abutted against the third conveying member pair to correct the skew of the medium, and the medium after the skew correction is corrected. In the image processing apparatus configured to correct the end position of the medium by moving the third transport member pair in the member axial direction while being sandwiched between the third transport member pair,
When correcting the skew of the medium, the second conveying member pair holds and conveys the medium, and when correcting the end position of the medium, the second conveying member pair does not hold the medium. An image processing apparatus that performs state switching of the second conveying member pair.
JP2007328232A 2007-12-20 2007-12-20 Medium conveying device and image processing device Withdrawn JP2009149400A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013126914A (en) * 2011-12-19 2013-06-27 Canon Inc Sheet conveying apparatus and image forming apparatus
JP2013133223A (en) * 2011-12-27 2013-07-08 Konica Minolta Business Technologies Inc Paper conveying device and image forming apparatus
JP2014019565A (en) * 2012-07-23 2014-02-03 Ricoh Co Ltd Carrying device, and image forming apparatus
JP2015075596A (en) * 2013-10-08 2015-04-20 富士ゼロックス株式会社 Image forming apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013126914A (en) * 2011-12-19 2013-06-27 Canon Inc Sheet conveying apparatus and image forming apparatus
US9329554B2 (en) 2011-12-19 2016-05-03 Canon Kabushiki Kaisha Sheet conveying apparatus and image forming apparatus
JP2013133223A (en) * 2011-12-27 2013-07-08 Konica Minolta Business Technologies Inc Paper conveying device and image forming apparatus
JP2014019565A (en) * 2012-07-23 2014-02-03 Ricoh Co Ltd Carrying device, and image forming apparatus
JP2015075596A (en) * 2013-10-08 2015-04-20 富士ゼロックス株式会社 Image forming apparatus

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