JP5382628B2 - A sheet conveying apparatus and an image forming apparatus including the same. - Google Patents
A sheet conveying apparatus and an image forming apparatus including the same. Download PDFInfo
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- JP5382628B2 JP5382628B2 JP2012051423A JP2012051423A JP5382628B2 JP 5382628 B2 JP5382628 B2 JP 5382628B2 JP 2012051423 A JP2012051423 A JP 2012051423A JP 2012051423 A JP2012051423 A JP 2012051423A JP 5382628 B2 JP5382628 B2 JP 5382628B2
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Description
本発明は、複写機、プリンタ、ファクシミリ、及びこれらの機能を複合したデジタル複合機などの画像形成装置、およびこれらに用いるシート搬送装置に関する。 The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile machine, and a digital multi-function machine that combines these functions, and a sheet conveying apparatus used for these.
図1は、一般的な画像形成装置の断面図であり、用紙や記録材(以下において単に用紙というが、紙以外の素材からなる記録材も含む。)の搬送経路を示したものである。 FIG. 1 is a cross-sectional view of a general image forming apparatus, and shows a conveyance path of paper and a recording material (hereinafter simply referred to as paper, but also includes a recording material made of a material other than paper).
図示の画像形成装置1で片面に画像形成する時、給紙部3に積載された用紙Pは給紙され、片面に画像形成部2で画像を転写され、定着部4で画像を定着され、反転部6に放出され、反転部6でスイッチバックして反転され、排紙部8を通って排紙される。 When forming an image on one side with the illustrated image forming apparatus 1, the paper P stacked on the paper feeding unit 3 is fed, the image is transferred on one side by the image forming unit 2, and the image is fixed by the fixing unit 4. It is discharged to the reversing unit 6, switched back and reversed by the reversing unit 6, and discharged through the paper discharge unit 8.
この種の画像形成装置において、両面に画像形成する時は、給紙部3に積載された用紙Pは給紙され、片面に画像形成部2で画像を転写され、定着部4で画像を定着され、反転部6に放出され、反転部6でスイッチバックして反転され、両面給送路7を通って、再び給紙され、裏面に画像形成部2で画像を転写され、定着部4で画像を定着され、排紙部8を通って排紙される。両面に画像形成せず、片面だけに画像形成する時は、給紙部3に積載された用紙Pは給紙され、片面に画像形成部2で画像を転写され、定着部4で画像を定着され、排紙部8を通って排紙される。図中5は用紙搬送部、41は用紙搬送ローラ対、16は用紙排出方向切り替え部、15は両面ターンローラ、17は用紙搬送方向切り替え部である。 In this type of image forming apparatus, when images are formed on both sides, the paper P stacked on the paper feeding unit 3 is fed, the image is transferred to one side by the image forming unit 2, and the image is fixed by the fixing unit 4. The image is discharged to the reversing unit 6, switched back and reversed by the reversing unit 6, fed again through the duplex feeding path 7, transferred to the back side by the image forming unit 2, and fixed by the fixing unit 4. The image is fixed and discharged through the paper discharge unit 8. When forming an image on only one side without forming an image on both sides, the paper P stacked on the paper feeding unit 3 is fed, and an image is transferred to the one side by the image forming unit 2, and the image is fixed by the fixing unit 4. Then, the paper is discharged through the paper discharge unit 8. In the figure, 5 is a paper transport unit, 41 is a paper transport roller pair, 16 is a paper discharge direction switching unit, 15 is a double-sided turn roller, and 17 is a paper transport direction switching unit.
図2は、図1の装置の反転部とその周辺の主要構成図である。画像を転写、定着された用紙Pは、反転部6に搬送される。反転部6では、反転部6の入口から反転部6へ用紙Pを搬入する搬入ローラ9と搬送爪10(以下ではそれぞれ反転搬入ローラ9、反転搬送爪10という)の対が用紙Pを反転テーブル11へ放出する。爪が櫛歯形状の反転搬送爪10の個々の爪と、団子形状の反転搬入ローラ9の個々のコロは互い違いに位置し、図3に示すように、反転搬入ローラ9と反転搬送爪10により生じる波打ち形状による用紙のコシにより生じる反転搬入ローラ9への加圧力により用紙は反転テーブル11へと搬入される。なお図4に示すように、反転搬送爪10と反転搬入ローラ9が用紙を搬入するとき、加圧スプリング23によって、用紙Pを加圧する力が調整されている。図中22a、22bは用紙Pの反転搬入ローラ9への進入をガイドするガイド部材である。 FIG. 2 is a main configuration diagram of the reversing unit and its periphery of the apparatus of FIG. The sheet P on which the image has been transferred and fixed is conveyed to the reversing unit 6. In the reversing unit 6, a pair of a carry-in roller 9 that carries the paper P from the entrance of the reversing unit 6 to the reversing unit 6 and a conveying claw 10 (hereinafter referred to as a reverse carrying-in roller 9 and a reversing conveying claw 10 respectively) 11 to release. The individual claws of the reverse conveying claw 10 having a comb tooth shape and the rollers of the reverse conveying roller 9 having a dumpling shape are alternately positioned. As shown in FIG. 3, the reverse conveying roller 9 and the reverse conveying claw 10 The paper is carried into the reversing table 11 by the pressure applied to the reversing carry-in roller 9 caused by the stiffening of the paper due to the generated wavy shape. As shown in FIG. 4, when the reverse conveyance claw 10 and the reverse carry-in roller 9 carry in the paper, the force for pressing the paper P is adjusted by the pressure spring 23. In the figure, reference numerals 22a and 22b denote guide members for guiding the sheet P to enter the reverse carry-in roller 9.
反転テーブル11上には用紙Pの位置や姿勢を整えるジョガーフェンス対12が設けられており、図2の紙面の垂直方向で可動になっている。反転テーブル11上に放出された用紙Pを、用紙Pを受入れるため用紙幅より広い位置で待機していたジョガーフェンス対12が用紙をガイドする位置まで移動するジョグ動作を行い、用紙Pの両側をガイドする。ジョガーフェンス12が用紙をガイドした状態で、上方に移動していた逆転従動コロ13が降下し、逆転する逆転駆動ローラ14に圧接して用紙Pをスイッチバックさせて両面ターンローラ15側へと搬出する。図中34はターン分岐爪、35は反転中間ローラ、36は従動入口ローラ、37は従動出口ローラである。 A jogger fence pair 12 for adjusting the position and posture of the paper P is provided on the reversing table 11 and is movable in the direction perpendicular to the paper surface of FIG. A jog operation is performed to move the paper P discharged on the reversing table 11 to a position where the jogger fence pair 12 waiting in a position wider than the paper width to receive the paper P guides the paper. To guide. With the jogger fence 12 guiding the paper, the reverse driven roller 13 that has been moved upward is lowered, pressed against the reverse rotation driving roller 14 to switch back the paper P, and carried to the double-sided turn roller 15 side. To do. In the figure, 34 is a turn branch claw, 35 is a reverse intermediate roller, 36 is a driven inlet roller, and 37 is a driven outlet roller.
その後、逆転従動コロ13が上昇して逆転駆動ローラ14との圧接を解除する。用紙Pの片面にだけ画像形成する時は、用紙Pを排紙部へ送り、画像形成装置外へと排紙する。両面時、両面ターンローラ15が用紙をターンして、両面給送路7へと搬送する。両面給送路7は用紙を中継ローラ26、27、28へと搬送し、画像形成部2へ再給紙される。 Thereafter, the reverse driven roller 13 is lifted to release the pressure contact with the reverse drive roller 14. When an image is formed on only one side of the paper P, the paper P is sent to the paper discharge unit and discharged outside the image forming apparatus. At both sides, the double-sided turn roller 15 turns the paper and conveys it to the double-sided feeding path 7. The duplex feeding path 7 conveys the sheet to the relay rollers 26, 27, and 28 and is fed again to the image forming unit 2.
図5は、上述のような反転搬入ローラ9と反転搬送爪10を示す斜視図である。反転テーブル11へと搬入される用紙P1と反転テーブル11から搬出される用紙P1、P2とがすれ違う(図6、図7参照)ことによる時間のロスを抑制するため、また、他と共通のモータで駆動して駆動構成を簡単にするため、反転搬入ローラ9は回転方向が一方向(図中矢印C方向)である。しかも図3に示すような波打ち形状を生じさせるため、図4に示すように反転搬送爪10を図中上方へ引き上げ付勢してあり、反転搬送爪10の先端部分は反転搬入ローラ9の外周よりも内径側へ入り込むように配置してあり、反転搬入ローラ9の一部分9aが反転搬送爪10よりも下側に出る構成となっている。したがって図6のように用紙を反転テーブル11上へ送り込むときは反転搬送爪10が用紙Pで押し下げられるので上述の部分9aは生じず、または若干生じても用紙Pの搬送に問題は生じないが、用紙Pが上述のようにスイッチバックする時、図示のように用紙Pの角隅部分が大きくカールしていると、カールしている用紙Pの先端部分P1が、搬出方向(図中矢印X)とは逆方向(矢印C方向)に回転している反転搬入ローラ9と、詳細には反転搬送爪10の下方へ突出している部分9aに接触し、さらに丸まってしまい、それがジャムや用紙のダメージ(折れや耳折れなど)を発生させ得る。すなわち、用紙の搬送品質を低下させ得る。 FIG. 5 is a perspective view showing the reverse carry-in roller 9 and the reverse conveyance claw 10 as described above. In order to suppress time loss due to the paper P1 carried into the reversing table 11 and the papers P1 and P2 carried out from the reversing table 11 passing each other (see FIGS. 6 and 7), a motor common to others is used. The reverse carry-in roller 9 is rotated in one direction (arrow C direction in the figure). Moreover, in order to generate a corrugated shape as shown in FIG. 3, the reverse conveying claw 10 is lifted and biased upward in the drawing as shown in FIG. 4, and the tip portion of the reverse conveying claw 10 is the outer periphery of the reverse carrying roller 9. The reversing and loading roller 9 is configured such that a part 9 a of the reversing and loading roller 9 protrudes below the reversing and conveying claw 10. Therefore, when the paper is fed onto the reversing table 11 as shown in FIG. 6, the reversing conveyance claw 10 is pushed down by the paper P, so that the above-mentioned portion 9a does not occur or even if it occurs slightly, there is no problem in the conveyance of the paper P. When the paper P is switched back as described above, if the corner portion of the paper P is greatly curled as shown in the figure, the leading end portion P1 of the curled paper P is moved in the carry-out direction (arrow X in the figure). ) In contact with the reverse carry-in roller 9 rotating in the opposite direction (arrow C direction), and more specifically, the portion 9a protruding downward of the reverse carry claw 10, and further curled up, which is jammed or paper Can cause damage (breaks, broken ears, etc.). That is, the conveyance quality of the paper can be reduced.
また熱を利用した定着を有する画像形成装置では、定着後に用紙のカールが大きくなる可能性が高く、また、トナーにより形成された画像により用紙Pにカールが発生することもある。 In an image forming apparatus having heat-based fixing, there is a high possibility that the paper curls after fixing, and the paper P may be curled by an image formed with toner.
従来の装置構成では、このような反転搬入ローラの駆動は専用の駆動源を使用するか、または読み取り搬送とは異なる給紙部の駆動源と共用することで原稿搬送方向の正逆転を行っている。このため、駆動源が増えコストが高くなる。 In the conventional apparatus configuration, the reverse carry-in roller is driven by using a dedicated drive source, or by using the drive source of the paper feeding unit different from the read conveyance to perform forward / reverse rotation in the document conveyance direction. Yes. For this reason, a drive source increases and cost becomes high.
本発明は、上述のような従来の問題点にかんがみてなしたもので、ジャムや用紙へのダメージを簡単な機構で安価に防止することができるシート搬送装置、これを備えた画像形成装置、電子写真複写機、プリンタ、ファクシミリ、デジタル複合機を提供することを目的とするものである。 The present invention has been made in view of the above-described conventional problems, and is capable of preventing damage to jams and paper at a low cost with a simple mechanism, and an image forming apparatus including the same. An object of the present invention is to provide an electrophotographic copying machine, a printer, a facsimile machine, and a digital multifunction machine.
本発明のシート搬送装置は、スイッチバック反転部への用紙や記録材の搬入路からは外れた位置に回転中心があり、外周面が前記搬入路内へ進入するように配置され、前記スイッチバック反転部の入口から該スイッチバック反転部へ用紙や記録材を搬入する方向へ回転する反転搬入ローラと、該反転搬入ローラの端面の片側もしくは両側に位置するローラガイドコロとを備え、用紙や記録材に対する前記ローラガイドコロの摩擦係数を、用紙や記録材に対する前記反転搬入ローラの摩擦係数よりも低くした、こと特徴とする。 The sheet conveying apparatus of the present invention is arranged such that the rotation center is located at a position deviated from the paper or recording material carry-in path to the switchback reversing unit, and the outer peripheral surface enters the carry-in path. an inverting carry-roller rotating from the inlet of the reversing section in the direction for carrying the sheet and the recording material to said switchback reversing unit, also single side of the end face of the inverted carrying rollers properly includes a roller guide rollers located on both sides The friction coefficient of the roller guide roller with respect to the paper and the recording material is lower than the friction coefficient of the reverse carry-in roller with respect to the paper and the recording material.
本発明によれば、ローラガイドコロが用紙や記録材をガイドして反転搬入ローラへの不要な接触を防ぐとともに、反転搬入ローラへの用紙のガイドを最適にできるため、簡単な構成で、安価に搬送性能が向上するという効果がある。 According to the present invention, the roller guide roller guides the paper and the recording material to prevent unnecessary contact with the reverse carry-in roller, and the paper guide to the reverse carry-in roller can be optimized. This has the effect of improving the conveyance performance.
以下本発明を実施するための形態を、図に示す実施形態を参照して説明する。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the embodiments shown in the drawings.
図8は、本発明に係るシート搬送装置の一実施例における反転搬入ローラとローラガイドコロの構成図で、従来の例を示す図5相当の斜視図(A)と、本例で使用したローラガイドコロを示す拡大断面図(B)ある。 FIG. 8 is a configuration diagram of the reverse carry-in roller and the roller guide roller in the embodiment of the sheet conveying apparatus according to the present invention. FIG. 8 is a perspective view corresponding to FIG. 5 showing a conventional example, and the roller used in this example. It is an expanded sectional view (B) which shows a guide roller.
ローラガイドコロ17は、材質が摺動性の良い低摩擦部材で、正逆回転自由に反転搬入ローラ9の軸19上に同軸にかつ反転搬入ローラ9に近接させて設けられており、自由に正逆回転できるようにしてある。すなわち反転搬入ローラ9の回転とは連動しないようにしてある。反転搬入ローラ9の同軸上には、反転搬入ローラ9とローラガイドコロ17の側面との間には、摺動性の良い薄い(例えば0.1mm〜0.2mm前後となるであろうが、できるだけ薄いほうが好ましい。)摺動シート20が設けられている。摺動シート20は、基本的には反転搬入ローラ9やローラガイドコロ17の動作とは関係付けられておらず、フリーである。ただし、接触による連れ回りなどは有り得るが、そのような動作を行っても特に問題は無い。なお反転搬入ローラ9やローラガイドコロ17の材質によっては摺動シート20を設けなくてもよい場合もあり得る。なお、あまり厚いと図3に示すような用紙Pの搬送形態が取れないこともあり得る。 The roller guide roller 17 is a low-friction member made of a material having good slidability. The roller guide roller 17 is provided on the shaft 19 of the reverse carry-in roller 9 coaxially and in the vicinity of the reverse carry-in roller 9 so as to freely rotate forward and backward. It can be rotated forward and backward. That is, the rotation of the reverse loading roller 9 is not interlocked. On the same axis as the reverse carry-in roller 9, between the reverse carry-in roller 9 and the side surface of the roller guide roller 17, the sliding property is thin and good (for example, about 0.1 mm to 0.2 mm, The thinner one is preferable.) A sliding sheet 20 is provided. The sliding sheet 20 is basically not related to the operation of the reverse loading roller 9 and the roller guide roller 17 and is free. However, there is a possibility that it will be accompanied by contact, but there is no particular problem even if such an operation is performed. Depending on the material of the reverse loading roller 9 and the roller guide roller 17, the sliding sheet 20 may not be provided. If the thickness is too thick, the conveyance mode of the paper P as shown in FIG. 3 may not be obtained.
ローラガイドコロ17は、図示の例では中央の反転搬入ローラ9以外の軸線方向両側のすべてのものに対して組み合わせてあるが、反転搬入ローラ9は、装置が搬送するいずれかのサイズの用紙端部近傍を搬送する(用紙端部近傍に位置する)反転搬入ローラ9の軸線方向外側に設ける等々種々の配置を採用しえる。したがって図示の構成、配置には本発明は限定されない。 In the illustrated example, the roller guide roller 17 is combined with all the axially opposite sides except for the central reverse carry-in roller 9, but the reverse carry-in roller 9 is the end of the sheet of any size conveyed by the apparatus. Various arrangements such as providing the reversal loading roller 9 on the outer side in the axial direction (located in the vicinity of the end of the sheet) that conveys the vicinity of the portion may be employed. Therefore, the present invention is not limited to the illustrated configuration and arrangement.
特に用紙サイズが大きい場合には用紙のカールが大きくなる傾向にあるので、大きいサイズの用紙の端部近傍に位置する反転搬送ローラ9に対してだけローラガイドコロ17を組み合わせて設けるのもコスト的に有利な場合もある。 In particular, when the paper size is large, the curl of the paper tends to increase. Therefore, it is costly to provide the roller guide roller 17 in combination only with the reverse conveying roller 9 located near the end of the large size paper. May be advantageous.
ローラガイドコロ17の外径は反転搬入ローラ9の外径より僅かな寸法d(例えば0.1mm程度。ただし、使用する用紙の性状によって定めればよい。)小さいだけなので、用紙Pと接触して用紙Pを搬入する必要な面である反転搬入ローラ9の外径面(外周面)にのみ用紙Pが接触して、それ以外の不要な部分の接触を防止する。 The outer diameter of the roller guide roller 17 is slightly smaller than the outer diameter of the reverse carry-in roller 9 (for example, about 0.1 mm; however, it may be determined depending on the properties of the paper to be used). Thus, the paper P comes into contact only with the outer diameter surface (outer peripheral surface) of the reverse carry-in roller 9 that is a surface on which the paper P needs to be carried in, and contact with other unnecessary portions is prevented.
ローラガイドコロ17を、反転搬入ローラ9の軸19に回転可能に装着する部分、すなわち軸19が貫通する中央部分にはもちろん穴が開けてあるが、そこから、ローラガイドコロ17の振れやガタツキを防止するために、ローラガイドコロ17の軸受部17aが十分長く(例えば一般的な画像形成装置では15〜20mmであるが、装置構成に対応させて長さを定めればよい。)円筒形状の軸受状に形成してある。なお、軸19には溝部が設けてあり、そこにストッパ21が取り付けてあり、ローラガイドコロ17の軸受部17aが軸19の軸線方向で移動しないようにしてある。すなわち、ローラガイドコロ17の軸19への取り付け部位が長いので、ローラガイドコロ17の位置が安定して搬送性能を安定させ得る。 Of course, there is a hole in the portion where the roller guide roller 17 is rotatably mounted on the shaft 19 of the reverse carry-in roller 9, that is, the central portion through which the shaft 19 penetrates. In order to prevent this, the bearing portion 17a of the roller guide roller 17 is sufficiently long (for example, 15 to 20 mm in a general image forming apparatus, but the length may be determined according to the apparatus configuration). It is formed in the shape of a bearing. The shaft 19 is provided with a groove portion, and a stopper 21 is attached to the groove portion so that the bearing portion 17a of the roller guide roller 17 does not move in the axial direction of the shaft 19. That is, since the attachment part of the roller guide roller 17 to the shaft 19 is long, the position of the roller guide roller 17 can be stabilized and the conveyance performance can be stabilized.
また、反転搬入ローラ9の軸に回転可能に取り付く部分は、回転がより滑らかになるようにベアリングを有していてもよい。画像形成装置においては、熱による定着やトナー画像によってカールが発生しやすいが、これらの単独または組合せによる構成により、用紙の丸まりによるジャムや耳折れなどの用紙ダメージを防止して搬送性能を安定向上している。 Moreover, the part rotatably attached to the axis | shaft of the reverse carrying-in roller 9 may have a bearing so that rotation may become smoother. In image forming devices, curling is likely to occur due to heat fixation and toner images. However, these single or combined configurations prevent paper damage such as jamming and ear folding due to paper curl and improve transport performance stably. doing.
用紙Pを搬入するとき、一方の端部分P1に反りが生じているとする。このまま搬送されると、従来の例のように反りがひどくなっていき、反転搬入ローラ9が適切に用紙Pに接して、用紙Pを搬出することができなくなる。しかし本実施例では、用紙Pの反っている端部分P1が反転搬入ローラ9に不要に接しないようにローラガイドコロ17が機能している。 When the paper P is carried in, it is assumed that the one end portion P1 is warped. If the sheet is conveyed as it is, the warpage becomes severe as in the conventional example, and the reverse carry-in roller 9 comes into contact with the sheet P appropriately and the sheet P cannot be carried out. However, in this embodiment, the roller guide roller 17 functions so that the warped end portion P <b> 1 of the paper P does not unnecessarily contact the reverse carry-in roller 9.
具体的には、図9に示すように、スイッチバック時に用紙Pの端部分P1に反りが合ったとすると、端部分P1の縁がローラガイドコロ17に摺接することがある。ローラガイドコロ17は低摩擦部材からなるので、用紙Pの端部分P1がローラガイドコロ17の縁に接触すると、上方へ反ろうとする用紙Pの挙動が抑えられ、上方へ反ろうとする力に対する下方へ向かう反力x1を受ける。これにより、ローラガイドコロ17の回転、非回転に拘らず用紙Pの丸まりが抑制され、仮に用紙Pの上面がローラガイドコロ17に接触していても、ローラガイドコロ17の縁に沿って反らずに滑るように搬送方向へ進み、図10に示すように反転搬送爪10の先端の下側へ入り込み、カールが生じたり、丸まりの度合いがひどくなることなく、両面給送路へと搬送されて行くことになり、搬送性能が向上する。 Specifically, as shown in FIG. 9, if the end portion P1 of the paper P is warped during switchback, the edge of the end portion P1 may come into sliding contact with the roller guide roller 17. Since the roller guide roller 17 is made of a low friction member, when the end portion P1 of the paper P comes into contact with the edge of the roller guide roller 17, the behavior of the paper P that warps upward is suppressed, and the downward force against the force of warping upward is reduced. Receives reaction force x1. Thereby, the curling of the paper P is suppressed regardless of the rotation or non-rotation of the roller guide roller 17, and even if the upper surface of the paper P is in contact with the roller guide roller 17, it is counteracted along the edge of the roller guide roller 17. As shown in FIG. 10, it moves in the conveyance direction so that it slips, enters the lower side of the tip of the reverse conveyance claw 10, and conveys it to the double-sided feed path without causing curling or curling. As a result, the conveyance performance is improved.
このとき、用紙Pの上面がローラガイドコロ17の縁のみならず反転搬送爪10の下縁に接触したとすると、用紙Pの上面にはローラガイドコロ17の縁による上述のような反力x1に加え、反転搬送爪10の下縁を押し上げようとする用紙Pの端部分P1による力に対する反力として、下方への反力x2が掛かり、両面給送路へとスムーズに搬送されて行くことになる。ただし、反力x2は、既述のように、反転搬送爪10が上方へと引き上げ付勢されているので、あまり大きくは無い。 At this time, if the upper surface of the paper P is in contact with not only the edge of the roller guide roller 17 but also the lower edge of the reverse conveying claw 10, the reaction force x1 as described above due to the edge of the roller guide roller 17 is applied to the upper surface of the paper P. In addition to this, as a reaction force against the force by the end portion P1 of the paper P trying to push up the lower edge of the reverse conveyance claw 10, a downward reaction force x2 is applied and the paper is smoothly conveyed to the duplex feeding path. become. However, the reaction force x2 is not so large because the reverse conveying claw 10 is biased upward as described above.
なお、用紙Pの搬送方向先側の丸まり等の変形は、用紙Pの端部のみならず、用紙Pの中央部分など端部以外の部位でも生じ得る。本実施例では、図示のように端部の反転搬入ローラ9だけでなく、その内側の反転搬入ローラ9にもローラガイドコロ17が組み合わせてあるので、上述の端部での挙動と同様に、用紙Pは両面給送路へとスムーズに搬送されて行くことになる。またカールの大きい用紙であっても用紙の丸まりによる耳折れを安価で確実に防止できるようになる。 It should be noted that deformation such as rounding of the sheet P in the conveyance direction can occur not only at the edge of the sheet P but also at other parts such as the center of the sheet P. In this embodiment, since the roller guide roller 17 is combined not only with the reverse carry-in roller 9 at the end as shown, but also with the reverse carry-in roller 9 inside, as in the behavior at the end described above, The paper P is smoothly transported to the duplex feeding path. Further, even for a paper with a large curl, it is possible to reliably prevent the ear folding due to the paper curl at a low cost.
すなわち、ローラガイドコロ17が自由に正逆回転でき、反転搬入ローラ9の回転とは連動しないようにしてあるので、用紙Pがローラガイドコロ17に接触してもローラガイドコロ17が自由に回転し、用紙Pへの負荷抵抗が少なく用紙Pのガイドできるため、用紙Pのカールが多きい場合にも、丸まりによるジャムや折れなどの搬送不具合が発生を抑制でき、安価に搬送性能がより向上できる。 That is, the roller guide roller 17 can freely rotate forward and backward, and is not interlocked with the rotation of the reverse carry-in roller 9, so that the roller guide roller 17 freely rotates even if the paper P contacts the roller guide roller 17. However, since the load resistance to the paper P is low and the paper P can be guided, even when the paper P has a lot of curl, it is possible to suppress the occurrence of conveyance problems such as jamming and folding due to rounding, and the conveyance performance is further improved at a low cost. it can.
また薄い摺動シート20でローラガイドコロ17と反転搬入ローラ9の接触を防止することで、ローラガイドコロ17の回転をスムーズに行え、用紙Pへの負荷抵抗を軽減させ、用紙Pの丸まりによるジャムや折れなどの搬送不具合が発生を精度良く抑制し、ローラガイドコロ17と反転搬入ローラ9の間隔を簡単に狭くかつ省スペースで安価に構成し、搬送性能の向上をさらに期待できるようにすることができる。 In addition, the thin sliding sheet 20 prevents the roller guide roller 17 and the reverse loading roller 9 from contacting each other, so that the roller guide roller 17 can be rotated smoothly, the load resistance on the paper P is reduced, and the paper P is rounded. It is possible to accurately suppress the occurrence of jamming, folding, and other conveyance problems, and to easily reduce the space between the roller guide roller 17 and the reverse loading roller 9 to be narrow and space-saving, thereby further improving the conveyance performance. be able to.
なお、ローラガイドコロ17の外径を反転搬入ローラ9の外径と同じもしくは僅かに小さく形成することで、ローラガイドコロ17の幅を薄く、省スペースにして、反転搬入ローラ9の不要な部分への用紙Pの接触を防止して搬送性能を向上させ得る。 In addition, by forming the outer diameter of the roller guide roller 17 to be the same as or slightly smaller than the outer diameter of the reverse carrying-in roller 9, the width of the roller guide roller 17 is reduced and space is saved, so that unnecessary portions of the reverse carrying-in roller 9 are eliminated. The conveyance performance can be improved by preventing the paper P from coming into contact with the paper.
なお以上のようなシート搬送装置を画像形成装置に用いれば、ローラガイドコロを有していることにより、画像転写、定着後の用紙のカールが発生しやすい条件であっても省スペースに搬送品質が向上できる。 If the sheet conveying device as described above is used in the image forming apparatus, the roller guide roller has a space-saving conveyance quality even under conditions where image transfer and fixing are likely to cause paper curling. Can be improved.
またなお、図示せぬが、一つの反転搬入ローラ9の両側にローラガイドコロ17を設ける構成とすることもできる。 Although not shown, a roller guide roller 17 may be provided on both sides of one reverse loading roller 9.
1:両面画像形成装置
2:画像形成部
3:給紙部
4:定着部
5:給紙搬送部
6:反転部
7:両面給送路
8:排紙部
9:反転搬入ローラ
9a:反転搬入ローラの一部分
10:反転搬送爪
11:反転テーブル
12:ジョガーフェンス対
13:逆転従動コロ
14:逆転駆動ローラ
15:ターンローラ
16:反転排紙経路
17:ローラガイドコロ
17a:軸受部
18:摺動シート
19:軸
20:摺動シート
21:止め輪
22:入口ガイド板
23:加圧スプリング
26、27、28:中継ローラ
34:ターン分岐爪
35:反転中間ローラ
36:従動入口ローラ
37:従動出口ローラ
41:レジストローラ対
P、P1、P2:用紙
X:用紙のスイッチバック時の搬送方向
x1、x2:反力
1: Double-sided image forming apparatus 2: Image forming unit 3: Paper feeding unit 4: Fixing unit 5: Paper feeding / conveying unit 6: Reversing unit 7: Double-sided feeding path 8: Paper discharging unit 9: Reverse carry-in roller 9a: Reverse carry-in Part of roller 10: Reverse conveyance claw 11: Reverse table 12: Jogger fence pair 13: Reverse driven roller 14: Reverse drive roller 15: Turn roller 16: Reverse discharge path 17: Roller guide roller 17a: Bearing portion 18: Sliding Sheet 19: Shaft 20: Sliding sheet 21: Retaining ring 22: Entrance guide plate 23: Pressure springs 26, 27, 28: Relay roller 34: Turn branch claw
35: reverse intermediate roller 36: driven inlet roller 37: driven outlet roller 41: registration roller pair P, P1, P2: paper X: transport direction x1, x2 at the time of paper switchback: reaction force
Claims (10)
該反転搬入ローラの端面の片側もしくは両側に位置するローラガイドコロと
を備え、
用紙や記録材に対する前記ローラガイドコロの摩擦係数を、用紙や記録材に対する前記反転搬入ローラの摩擦係数よりも低くした、
こと特徴とするシート搬送装置。 The rotation center is located at a position away from the paper or recording material carry-in path to the switchback reversing unit, and the outer peripheral surface is disposed so as to enter the carry-in path. A reversing carry-in roller that rotates in the direction of carrying the paper or recording material to the reversing unit;
Properly also at either side of the end face of the inverted carrying roller and the roller guide rollers located on both sides
With
The friction coefficient of the roller guide roller with respect to the paper and the recording material is made lower than the friction coefficient of the reverse carry-in roller with respect to the paper and the recording material.
A sheet conveying apparatus characterized by that.
該複数の反転搬入ローラのうち、該反転搬入ローラの軸方向で最外端側に位置する反転搬入ローラのうちの少なくとも一の反転搬入ローラの端面の片側もしくは両側に位置する前記複数のローラガイドコロをそれぞれ配し、
用紙や記録材に対する前記ローラガイドコロの摩擦係数を、用紙や記録材に対する前記反転搬入ローラの摩擦係数よりも低くし、前記スイッチバック反転部へ用紙や記録材を搬入するために前記用紙や記録材をスイッチバックさせる際に前記反転搬入ローラへの用紙や記録材の不要な接触を防止する構造とした、
こと特徴とするシート搬送装置。 The rotation center is located at a position away from the paper or recording material carry-in path to the switchback reversing unit, and the outer peripheral surface is disposed so as to enter the carry-in path. A plurality of reverse carry-in rollers for carrying paper and recording material to the reverse unit;
Of reversing carrying rollers of the plurality, properly also at either side of the end face of at least one reversing carrying rollers of the reversing feed-in rollers located at the outermost side in the axial direction of the reversing feed-in rollers are located on both sides said a plurality of roller guide rollers were distribution respectively,
The friction coefficient of the roller guide roller with respect to the paper and the recording material is made lower than the friction coefficient of the reversing carry-in roller with respect to the paper and the recording material, and the paper and the recording material are carried into the switchback reversing unit. has a structure to prevent unnecessary contact of the sheet and the recording material to the reversing feed-in rollers when causing the wood is switched back,
A sheet conveying apparatus characterized by that.
前記複数の反転搬入ローラの間に搬送爪を備え、
該搬送爪の先端を、前記複数の反転搬入ローラの間で前記搬入路内へ進入させて配置してなることを特徴とするシート搬送装置。 In the sheet conveying apparatus according to claim 2,
A conveying claw is provided between the plurality of reverse loading rollers,
A sheet conveying apparatus, wherein a leading end of the conveying claw is disposed between the plurality of reverse loading rollers so as to enter the loading path.
前記ローラガイドコロを、前記反転搬入ローラのうち搬送する用紙や記録材の幅端部に位置する反転搬入ローラに対応させて設けること特徴とするシート搬送装置。 In the sheet conveying apparatus according to claim 2 or 3,
The roller guide roller, said reversing loading sheet conveying apparatus characterized by providing in association with the reversing feed-in rollers located at the width end portion of the paper and the recording material carrying out the roller.
前記ローラガイドコロを、前記反転搬入ローラのうち搬送する用紙や記録材に波打ちが生じ得る部位に位置する反転搬入ローラに対応させて設けること特徴とするシート搬送装置。 In the sheet conveying apparatus according to any one of claims 2 to 4,
Said roller guide roller, the sheet conveying apparatus in correspondence to the inversion carrying roller located part position of waviness in the sheet and the recording material can occur for conveying, characterized by providing in one of the inverting feed-in rollers.
前記ローラガイドコロの外径を、該ローラガイドコロに対して配置された前記反転搬入ローラの外径と同じか僅かに小さく形成してなることを特徴とするシート搬送装置。 In the sheet conveying apparatus according to any one of claims 2 to 5,
The roller guide an outer diameter of the roller, the sheet conveying apparatus characterized by comprising in the same or slightly smaller outer diameter of the inverted carrying rollers disposed with respect to the roller guide U b.
前記ローラガイドコロを前記反転搬入ローラと同軸に配し、かつ該反転搬入ローラの軸に対してフリーに回転可能に設けて前記反転搬入ローラの回転方向に拘らずに前記ローラガイドコロを正転または逆転可能としてなることを特徴とするシート搬送装置。 In the sheet conveying apparatus according to any one of claims 1 to 6,
The roller guide roller a arranged in the reversing feed-in rollers coaxially and forward the roller guide roller regardless of the rotational direction of the rotatably arranged the inverted carry rollers move freely relative to the shaft of the reversing feed-in rollers Alternatively, the sheet conveying apparatus is characterized in that it can be reversed.
前記ローラガイドコロと前記反転搬入ローラの間に、前記ローラガイドコロと前記反転搬入ローラとの接触を防止する摺動材を配してなること特徴とするシート搬送装置。 In the sheet conveying apparatus according to any one of claims 1 to 7,
A sheet conveying apparatus, wherein a sliding material for preventing contact between the roller guide roller and the reverse carry-in roller is disposed between the roller guide roller and the reverse carry-in roller.
前記摺動材が前記反転搬入ローラに比して薄いシート材からなること特徴とするシート搬送装置。 The sheet conveying apparatus according to claim 8,
The sheet conveying apparatus according to claim 1, wherein the sliding member is made of a sheet material that is thinner than the reverse loading roller.
An image forming apparatus comprising the sheet conveying device according to claim 1.
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