JP4150856B2

JP4150856B2 - Paper transport device, automatic document feeder, and image forming apparatus

Info

Publication number: JP4150856B2
Application number: JP2003379518A
Authority: JP
Inventors: 輝鮮秦; 剛水端; 雅青木; 聡清水
Original assignee: Konica Minolta Business Technologies Inc
Current assignee: Konica Minolta Business Technologies Inc
Priority date: 2003-11-10
Filing date: 2003-11-10
Publication date: 2008-09-17
Anticipated expiration: 2023-11-10
Also published as: JP2005142995A

Description

本発明は、電子写真複写機、プリンタ、ファクシミリ等の画像形成装置、及び複合機能を有する画像形成装置の用紙搬送装置に関し、特に、スリット露光用ガラスの上方を通過する原稿の画像を読み取る原稿移動露光型（シートスルー型）読取装置、又は原稿台ガラスの上に載置された原稿の画像を読み取る光学系移動露光型（フラットベッド型）読取装置に装着される自動原稿送り装置に関するものである。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electrophotographic copying machine, a printer, and a facsimile, and a sheet conveying device of an image forming apparatus having a composite function, and in particular, an original movement for reading an image of an original passing over a slit exposure glass The present invention relates to an automatic document feeder mounted on an exposure type (sheet through type) reading device or an optical system moving exposure type (flat bed type) reading device that reads an image of a document placed on a platen glass. .

図７（ａ）は従来の用紙搬送装置の要部断面図である。 FIG. 7A is a cross-sectional view of a main part of a conventional paper conveying apparatus.

用紙搬送装置は、湾曲した形状をなす搬送経路の上流側の第１ガイド部材１０１と、上流側搬送経路の用紙搬送方向下流側の搬送経路の第２ガイド部材１０２と、第１ガイド部材１０１の用紙搬送方向上流側に配置された１組のローラ対から成る搬送ローラ１０３と、第２ガイド部材１０２の入口の入口開口部１０２Ａの下流側に配置された１組のローラ対から成る搬送ローラ１０４とから構成されている。 The sheet conveying apparatus includes a first guide member 101 on the upstream side of the curved conveyance path, a second guide member 102 on the conveyance path downstream in the sheet conveyance direction of the upstream conveyance path, and the first guide member 101. A conveyance roller 103 composed of a pair of roller pairs arranged on the upstream side in the sheet conveyance direction, and a conveyance roller 104 composed of a set of roller pairs arranged on the downstream side of the inlet opening 102A at the entrance of the second guide member 102. It consists of and.

第１ガイド部材１０１の出口開口部１０１Ａの下側ガイド面１０１Ｂと、第２ガイド部材１０２の入口開口部１０２Ａの下側ガイド面１０２Ｂとは段差部ｈを形成して第２ガイド部材１０２の入口開口部１０２Ａの下面が広くなっている。 The lower guide surface 101B of the outlet opening 101A of the first guide member 101 and the lower guide surface 102B of the inlet opening 102A of the second guide member 102 form a stepped portion h to enter the second guide member 102. The lower surface of the opening 102A is wide.

上記の構成において、搬送ローラ１０３の回転によって、用紙Ｓが第１ガイド部材１０１に沿って搬送され、第１ガイド部材１０１の出口開口部１０１Ａを通過し、第２ガイド部材１０２の入口開口部１０２Ａに導入され、搬送ローラ１０４に挟持されて更に下流側に搬送される。 In the above configuration, the sheet S is transported along the first guide member 101 by the rotation of the transport roller 103, passes through the outlet opening 101 </ b> A of the first guide member 101, and the inlet opening 102 </ b> A of the second guide member 102. And is sandwiched between the transport rollers 104 and transported further downstream.

ここで、第１ガイド部材１０１の出口開口部１０１Ａの下側ガイド面１０１Ｂと、第２ガイド部材１０２の入口開口部１０２Ａの下側ガイド面１０２Ｂとに段差部ｈを形成したのは、用紙Ｓの搬送方向先端部が第２ガイド部材１０２の入口開口部１０２Ａの下側ガイド面１０２Ｂに接触して、搬送不良を発生させる事を防止するためである。 Here, the step S is formed on the lower guide surface 101B of the outlet opening 101A of the first guide member 101 and the lower guide surface 102B of the inlet opening 102A of the second guide member 102. This is to prevent the conveyance direction tip from coming into contact with the lower guide surface 102B of the inlet opening 102A of the second guide member 102 to cause a conveyance failure.

段差部ｈを形成する第２ガイド部材１０２の入口開口部１０２Ａにおける用紙搬送経路と、搬送ローラ１０４の挟持位置における共通接線ＣＴとは、ほぼ平行に配置されている。従って、共通接線ＣＴの第２ガイド部材１０２の入口開口部１０２Ａ近傍では、第１ガイド部材１０１の出口開口部１０１Ａ近傍の下側ガイド面１０１Ｂより下方に位置する。 The sheet conveyance path at the entrance opening 102A of the second guide member 102 forming the stepped portion h and the common tangent CT at the nipping position of the conveyance roller 104 are arranged substantially in parallel. Therefore, in the vicinity of the inlet opening 102A of the second guide member 102 of the common tangent CT, the position is located below the lower guide surface 101B in the vicinity of the outlet opening 101A of the first guide member 101.

特許文献１は、上流側搬送面と下流側搬送面とを連続的に設け、この上流側搬送面と下流側搬送面とに所定の段差を形成した用紙搬送装置において、下流側搬送面にスポンジ、ゴム、起毛布等の緩衝部材を設け、用紙の後端部が下流側搬送面へ打ちつけられる際の衝撃を緩和するものである。 Japanese Patent Application Laid-Open No. 2004-133867 discloses a paper transport apparatus in which an upstream transport surface and a downstream transport surface are continuously provided, and a predetermined level difference is formed between the upstream transport surface and the downstream transport surface. In addition, a cushioning member such as rubber or a raised cloth is provided to alleviate the impact when the trailing edge of the paper is struck against the downstream conveying surface.

図７（ｂ）は従来の自動原稿送り装置の要部断面図である。 FIG. 7B is a cross-sectional view of a main part of a conventional automatic document feeder.

図示しない原稿給紙台上に載置された原稿ｄは、１組のローラ対から成る搬送ローラ２４により挟持されて原稿案内部材２５の湾曲面に沿って搬送され、図示しない画像読取装置の読取部のスリット露光用ガラス１３の位置において原稿の画像を読取処理されたのち、原稿ガイド部材２５から成る第１ガイド部材の出口部を通過して、下流側の第２ガイド部材１９の入口部に導入され、１組のローラ対から成る搬送ローラ２６に挟持されて排出される。
特開平５−１１６７９７号公報 A document d placed on a document feeder (not shown) is nipped by a conveyance roller 24 composed of a pair of rollers and conveyed along a curved surface of a document guide member 25, and is read by an image reading device (not shown). After the image of the original is read and processed at the position of the slit exposure glass 13, it passes through the outlet of the first guide member comprising the original guide member 25 and enters the inlet of the second guide member 19 on the downstream side. It is introduced, and is sandwiched and discharged by a conveying roller 26 composed of a pair of rollers.
Japanese Patent Application Laid-Open No. 5-1176797

このような用紙搬送装置や自動原稿送り装置において、湾曲した形状をなす上流側の搬送経路の第１ガイド部材の出口部と下流側の搬送経路のガイド部材の入口部とが近接する箇所で、用紙先端部が第２ガイド部材の入口部の下面に接触して、搬送不良を発生させる事を防止するため第２ガイド部材に段差部を設けた場合、段差部において用紙の後端部が下流側搬送面へ打ちつけられる際に衝撃が発生する。 In such a paper transport device or automatic document feeder, at the location where the exit portion of the first guide member of the upstream transport path having a curved shape and the entrance portion of the guide member of the downstream transport path are close to each other, In order to prevent the leading edge of the sheet from contacting the lower surface of the inlet portion of the second guide member and causing a conveyance failure, when the stepped portion is provided in the second guide member, the trailing edge of the sheet is downstream in the stepped portion. An impact occurs when it is struck against the side transport surface.

特許文献１では、この衝撃発生を防止するため、下流側搬送面にスポンジ、ゴム等から成る緩衝部材を設け、用紙の後端部が下流側搬送面へ打ちつけられる際の衝撃を緩和するものであるが、緩衝部材の貼着工数増、貼着剥がれ、緩衝部材の表面保護のための耐摩耗性フィルムの追加、部品点数の増大等の問題がある。 In Patent Document 1, a buffer member made of sponge, rubber, or the like is provided on the downstream conveyance surface in order to prevent the occurrence of the impact, and the impact when the rear end portion of the sheet is struck against the downstream conveyance surface is reduced. However, there are problems such as an increase in the number of steps for attaching the buffer member, peeling off, addition of a wear-resistant film for protecting the surface of the buffer member, and an increase in the number of parts.

本発明は、上記の課題を解決するものであり、湾曲した形状をなす上流側の搬送経路の第１ガイド部材の出口部と下流側の搬送経路の第２ガイド部材の入口部とが係合する箇所における用紙先端部の導入を容易にすると共に、用紙後端部通過時の騒音発生を防止することを目的とするものである。 The present invention solves the above-described problem, and the outlet portion of the first guide member in the upstream conveyance path and the inlet portion of the second guide member in the downstream conveyance path are engaged with each other in a curved shape. It is an object of the present invention to facilitate the introduction of the leading end of the paper at the location where the paper is to be fed and to prevent the generation of noise when passing the trailing edge of the paper.

上記目的を達成する請求項１に係る本発明の用紙搬送装置は、湾曲した形状をなし出口開口部を有する用紙搬送方向上流側の第１ガイド部材と、前記第１ガイド部材の用紙搬送方向下流側に配置され前記出口開口部より広い入口開口部を有する第２ガイド部材と、前記第２ガイド部材の入口開口部の用紙搬送方向下流側に配置され用紙を挟持して搬送する１組のローラ対から成る搬送ローラと、から構成され、前記第１ガイド部材の出口開口部を通過した用紙が前記第２ガイド部材の入口開口部を通過した後、前記搬送ローラにより搬送される用紙搬送装置において、用紙の後端部が前記第１ガイド部材の湾曲部下流の出口開口部と前記第２ガイド部材の入口開口部との間を通過する際に、前記搬送ローラの共通接線上を通るような位置関係に前記搬送ローラの互いのローラを配置したことを特徴とする用紙搬送装置。 The paper transport device of the present invention according to claim 1 that achieves the above object comprises a first guide member on the upstream side in the paper transport direction having a curved shape and having an outlet opening, and downstream of the first guide member in the paper transport direction. A second guide member disposed on the side and having an inlet opening wider than the outlet opening, and a pair of rollers disposed on the downstream side in the sheet conveying direction of the inlet opening of the second guide member and sandwiching and conveying the sheet A pair of transport rollers, and a sheet transport apparatus in which the sheet that has passed through the outlet opening of the first guide member is transported by the transport roller after passing through the inlet opening of the second guide member. , when the trailing end of the sheet passes between the inlet opening of the first guide member bend downstream of the outlet opening and the front Stories second guide member, so as to pass through the upper common tangent of the transport roller Positional relationship Sheet conveying apparatus characterized in that a mutual roller of the transport roller.

また、上記目的を達成する請求項２に係る本発明の自動原稿送り装置は、湾曲した形状をなし出口開口部を有する原稿搬送方向上流側の第１ガイド部材と、前記第１ガイド部材の原稿搬送方向下流側に配置され前記出口開口部より広い入口開口部を有する第２ガイド部材と、前記第２ガイド部材の入口開口部の原稿搬送方向下流側に配置され原稿を挟持して搬送する１組のローラ対から成る搬送ローラと、から構成され、画像読取装置の読取部において読取処理された原稿が、前記第１ガイド部材の出口開口部を通過し、前記第２ガイド部材の入口開口部を通過した後、前記搬送ローラにより搬送される原稿移動読取型の自動原稿送り装置において、原稿の後端部が前記第１ガイド部材の湾曲部下流の出口開口部と前記第２ガイド部材の入口開口部との間を通過する際に、前記搬送ローラの共通接線上を通るような位置関係に前記搬送ローラの互いのローラを配置したことを特徴とする自動原稿送り装置。 According to a second aspect of the present invention, there is provided an automatic document feeder according to a second aspect of the present invention, comprising: a first guide member having a curved shape and having an exit opening; an upstream side in the document transport direction; and a document of the first guide member. A second guide member disposed downstream in the transport direction and having an entrance opening wider than the exit opening, and disposed downstream of the entrance opening of the second guide member in the document transport direction and sandwiching and transporting the document 1 And a conveyance roller including a pair of rollers, and a document read by the reading unit of the image reading apparatus passes through the outlet opening of the first guide member, and the inlet opening of the second guide member after passing through, the moving original reading type automatic document feeder that is conveyed by the conveying rollers, the rear end of the document is the first guide member bend downstream of the outlet opening and the front Stories second guide member entrance When passing between the mouth portion, an automatic document feeder and characterized in that a mutual roller of the conveying rollers in the common tangent on the positional relationship, such as through the conveyance rollers.

更に、上記目的を達成する請求項３に係る本発明の自動原稿送り装置は、湾曲した形状をなし出口開口部を有する原稿搬送方向上流側の第１ガイド部材と、前記第１ガイド部材の原稿搬送方向下流側に配置され前記出口開口部より広い入口開口部を有する第２ガイド部材と、前記第２ガイド部材の入口開口部の原稿搬送方向下流側に配置され原稿を挟持して搬送する１組のローラ対から成る搬送ローラと、から構成され、画像読取装置の読取部において前記原稿を停止させて読取処理したのち、前記搬送ローラにより挟持して前記原稿を前記読取部から排出する光学系移動読取型の自動原稿送り装置において、原稿の後端部が前記第１ガイド部材の湾曲部下流の出口開口部と前記第２ガイド部材の入口開口部との間を通過する際に、前記搬送ローラの共通接線上を通るような位置関係に前記搬送ローラの互いのローラを配置したことを特徴とする自動原稿送り装置。
Furthermore, the automatic document feeder of the present invention according to claim 3 that achieves the above object comprises a first guide member on the upstream side in the document transport direction having a curved shape and having an exit opening, and the document of the first guide member. A second guide member disposed downstream in the transport direction and having an entrance opening wider than the exit opening, and disposed downstream of the entrance opening of the second guide member in the document transport direction and sandwiching and transporting the document 1 An optical system configured to stop the original in the reading unit of the image reading apparatus and read the document from the reading unit while being held by the conveying roller. in movable image-type automatic document feeder, when the rear end of the document passes between the inlet opening of the first guide member bend downstream of the outlet opening and the front Stories second guide member, the Transport Automatic document feeder, characterized in that arranging the mutual rollers of the transport roller to a position relationship as to pass over the common tangent of over la.

更に、請求項４に係る本発明の画像形成装置は、画像形成装置の画像形成部において画像形成された用紙を反転搬送させる反転搬送手段に、請求項１に記載の第１ガイド部材、第２ガイド部材、搬送ローラを配置したことを特徴とするものである。 Furthermore, an image forming apparatus according to a fourth aspect of the present invention provides the first guide member, the second guide member according to the first aspect, and a reverse conveying unit that reversely conveys the sheet on which the image is formed in the image forming unit of the image forming apparatus. A guide member and a conveyance roller are arranged.

以上説明したように、本発明の用紙搬送装置及び自動原稿送り装置により以下の効果が奏せられる。 As described above, the following effects can be achieved by the paper conveying device and the automatic document feeder of the present invention.

（１）湾曲形状をなす上流側の搬送経路の第１ガイド部材の出口部と、下流側の搬送経路の第２ガイド部材の入口部とが近接する箇所を用紙後端部が通過する時、湾曲した用紙後端部が湾曲通紙経路の段差部に打ちつけられて発生する衝撃が防止され、騒音発生が解消される。また、部品点数を増す事なく機構が簡単になる。 (1) When the trailing edge of the sheet passes through a location where the outlet portion of the first guide member of the upstream conveyance path having a curved shape and the inlet portion of the second guide member of the downstream conveyance path are close to each other, The impact generated when the curved rear end of the sheet is struck against the stepped portion of the curved sheet passing path is prevented, and noise generation is eliminated. In addition, the mechanism is simplified without increasing the number of parts.

（２）画像読取装置の読取部に原稿を搬送しながら原稿画像を読み取るシートスルー型の自動原稿送り装置において、読取部近傍に形成された湾曲形状をなす上流側の搬送経路の第１ガイド部材の出口部と、下流側の搬送経路の第２ガイド部材の入口部とが近接する箇所を原稿後端部が通過する時、湾曲した原稿後端部が湾曲通紙経路の段差部に打ちつけられて発生する衝撃が防止され、騒音発生が解消される。 (2) In a sheet-through type automatic document feeder that reads a document image while conveying the document to the reading unit of the image reading device, the first guide member of the upstream conveyance path having a curved shape formed in the vicinity of the reading unit When the document rear end portion passes through a position where the exit portion of the document and the inlet portion of the second guide member of the downstream conveyance path are close to each other, the curved document rear end portion is struck against the step portion of the curved sheet passing path. The impact that occurs is prevented and noise generation is eliminated.

（３）画像読取装置の原稿台ガラス上に原稿を搬送して原稿画像を読み取る光学系移動型の自動原稿送り装置において、原稿読取処理後に原稿を上方に湾曲させて排出する際に、湾曲した原稿後端部が打ちつけられて発生する衝撃が防止され、騒音発生が解消される。 (3) In an optical system moving type automatic document feeder that reads a document image by conveying the document on the document table glass of the image reading device, the document is curved when the document is curved upward and discharged after the document reading process. The impact generated when the trailing edge of the document is struck is prevented, and noise generation is eliminated.

（４）画像形成装置の画像形成部において画像形成された用紙を反転搬送させる反転搬送手段に、前記（１）に記載の第１ガイド部材、第２ガイド部材、搬送ローラを配置したことにより、湾曲した反転搬送路を通過する用紙後端部が湾曲通紙経路の段差部に打ちつけられて発生する衝撃が防止され、騒音発生が解消される。また、部品点数を増す事なく簡単な機構により騒音発生が解消される。 (4) By arranging the first guide member, the second guide member, and the conveyance roller according to (1) above in the reverse conveyance unit that reversely conveys the paper on which the image is formed in the image forming unit of the image forming apparatus, The impact caused by the trailing edge of the sheet passing through the curved reverse conveyance path being struck against the stepped portion of the curved sheet passing path is prevented, and noise generation is eliminated. Further, noise generation is eliminated by a simple mechanism without increasing the number of parts.

以下、本発明の用紙搬送装置及び自動原稿送り装置を添付図面に基づいて説明する。 DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sheet conveying device and an automatic document feeder according to the present invention will be described with reference to the accompanying drawings.

図１は、画像形成装置本体Ａ、画像読取装置１０、原稿移動読取型自動原稿送り装置ＤＦ１から成る画像形成装置の全体構成図である。 FIG. 1 is an overall configuration diagram of an image forming apparatus including an image forming apparatus main body A, an image reading apparatus 10, and a document movement reading type automatic document feeder DF1.

［画像形成装置本体Ａ］
画像形成装置本体Ａは、感光体ドラム１、画像処理部２、画像書込部３、画像形成部４、給紙カセット５Ａ、第１給紙手段５Ｂ、第２給紙手段５Ｃ、搬送手段６、定着装置７、排紙ローラ８、自動両面コピーのための反転搬送手段（ＡＤＵ）９を備えている。 [Image forming apparatus body A]
The image forming apparatus main body A includes a photosensitive drum 1, an image processing unit 2, an image writing unit 3, an image forming unit 4, a sheet feeding cassette 5A, a first sheet feeding unit 5B, a second sheet feeding unit 5C, and a conveying unit 6. , A fixing device 7, a paper discharge roller 8, and a reverse conveying means (ADU) 9 for automatic duplex copying.

画像形成装置本体Ａの上部には、原稿移動読取型自動原稿送り装置ＤＦ１が開閉可能に支持されている。 On the upper part of the image forming apparatus main body A, a document movement reading type automatic document feeder DF1 is supported to be openable and closable.

画像読取装置１０において読み取られた原稿画像の画像情報は画像処理部２により画像処理が行われ、画像データとして信号化され、一旦メモリに格納される。 Image information of the original image read by the image reading apparatus 10 is subjected to image processing by the image processing unit 2, converted into a signal as image data, and temporarily stored in a memory.

画像書込部３においては、半導体レーザからの出力光が画像形成部４の感光体ドラム１に照射され、潜像を形成する。画像形成部４においては、帯電、露光、現像、転写、分離、クリーニング等の処理が行われる。給紙カセット５Ａ、第１給紙手段５Ｂから搬送された用紙Ｓは、第２給紙手段５Ｃにより搬送され、画像形成部４の転写手段４Ａにより画像が転写される。画像を担持した用紙Ｓは、搬送手段６により搬送され、定着装置７により定着され、排紙ローラ８により装置外に排出される。 In the image writing unit 3, output light from the semiconductor laser is applied to the photosensitive drum 1 of the image forming unit 4 to form a latent image. In the image forming unit 4, processes such as charging, exposure, development, transfer, separation, and cleaning are performed. The sheet S conveyed from the sheet feeding cassette 5A and the first sheet feeding unit 5B is conveyed by the second sheet feeding unit 5C, and the image is transferred by the transfer unit 4A of the image forming unit 4. The sheet S carrying the image is conveyed by the conveying means 6, fixed by the fixing device 7, and discharged outside the apparatus by the paper discharge roller 8.

又は、搬送路切換板８Ａにより反転搬送手段９に送り込まれた第１面に画像形成された用紙Ｓは、第２給紙手段５Ｃにより搬送され、再び画像形成部４において第２面に画像形成後、排紙ローラ８により装置外に排出される。 Alternatively, the sheet S on which the image is formed on the first surface sent to the reverse conveying unit 9 by the conveyance path switching plate 8A is conveyed by the second sheet feeding unit 5C, and the image forming unit 4 again forms an image on the second surface. Thereafter, the paper is discharged out of the apparatus by a paper discharge roller 8.

或いは、搬送路切換板８Ａにより通常の排紙通路から分岐した用紙Ｓは、反転搬送手段９においてスイッチバックして表裏反転された後、排紙ローラ８により装置外に排出される。 Alternatively, the paper S branched from the normal paper discharge path by the transport path switching plate 8A is switched back and upside down by the reverse transport means 9 and then discharged out of the apparatus by the paper discharge roller 8.

図２は、画像読取装置１０及び原稿移動読取型自動原稿送り装置ＤＦ１の要部断面図である。 FIG. 2 is a cross-sectional view of the main parts of the image reading device 10 and the document movement reading type automatic document feeder DF1.

［画像読取装置１０］
画像形成装置本体Ａの上部には、画像読取装置１０が設置されている。画像読取装置１０の上部には、原稿台ガラス１１、シェーディング補正用基準板１２、スリット露光用ガラス１３、及び第１ガイド部材１４が配置されている。 [Image reading apparatus 10]
An image reading device 10 is installed on the upper part of the image forming apparatus main body A. A document table glass 11, a shading correction reference plate 12, a slit exposure glass 13, and a first guide member 14 are disposed on the image reading apparatus 10.

画像読取装置１０の光学系は、光源と第１ミラーを備える露光ユニット１５、第２ミラーと第３ミラーから成るＶミラーユニット１６、レンズ１７、ＣＣＤイメージセンサ１８により構成されている。 The optical system of the image reading apparatus 10 includes an exposure unit 15 including a light source and a first mirror, a V mirror unit 16 including a second mirror and a third mirror, a lens 17, and a CCD image sensor 18.

原稿移動読取型自動原稿送り装置ＤＦ１による原稿読み取りは、露光ユニット１５がスリット露光用ガラス１３の下方の初期位置（ホームポジション）に停止した位置において行われる。 Document reading by the document movement reading type automatic document feeder DF1 is performed at a position where the exposure unit 15 stops at an initial position (home position) below the slit exposure glass 13.

原稿台ガラス１１上の原稿の読み取りは、露光ユニット１５及びＶミラーユニット１６を移動させながら行われる。 Reading a document on the platen glass 11 is performed while moving the exposure unit 15 and the V mirror unit 16.

［原稿移動読取型自動原稿送り装置ＤＦ１］
図２は、スリット露光用ガラス１３の上方を通過する原稿ｄの画像を読み取る原稿移動読取型（シートスルー型）自動原稿送り装置ＤＦ１である。 [Document-reading automatic document feeder DF1]
FIG. 2 shows a document movement reading type (sheet through type) automatic document feeder DF1 that reads an image of the document d passing above the slit exposure glass 13.

原稿移動読取型自動原稿送り装置ＤＦ１において、２０は原稿給紙台、２１は給紙ローラ、２２は分離ローラ、２３はレジストローラ、２４，２６は搬送ローラ、２５は原稿案内部材、２７は排紙ローラ、２８Ａ，２８Ｂは反転ローラ、２９は排紙皿である。Ｇ１，Ｇ２は搬送路切換部材である。 In the document moving reading type automatic document feeder DF1, 20 is a document feeding table, 21 is a sheet feeding roller, 22 is a separation roller, 23 is a registration roller, 24 and 26 are conveyance rollers, 25 is a document guide member, and 27 is a discharge roller. A paper roller, 28A and 28B are reverse rollers, and 29 is a paper discharge tray. G1 and G2 are transport path switching members.

原稿移動読取型自動原稿送り装置ＤＦ１は、片面原稿読取機能と両面原稿読取機能とを有する。 The document movement reading type automatic document feeder DF1 has a single-sided document reading function and a double-sided document reading function.

図３は片面原稿読取機能の原稿搬送経路を示す断面図である。 FIG. 3 is a cross-sectional view showing the document conveyance path of the single-sided document reading function.

原稿給紙台２０上に画像面を上側にして載置された原稿ｄは、給紙ローラ２１、分離ローラ２２、レジストローラ２３によって送り出され、搬送路切換部材Ｇ１の図示左側面を通過し、搬送ローラ２４に挟持されて搬送され、原稿案内部材２５から成る第１ガイド部材により形成される搬送経路内を通過し、スリット露光用ガラス１３の上方位置において画像読取装置１０により原稿画像が読み取られ、第１ガイド部材１４等により形成される搬送経路内を通過し、搬送ローラ２６に挟持されて搬送され、排紙ローラ２７により排出され、排紙皿２９上に載置される。 A document d placed on the document feeder 20 with the image surface facing upward is sent out by a feed roller 21, a separation roller 22, and a registration roller 23, and passes through the left side of the conveyance path switching member G1 as shown in the figure. The original image is read by the image reading device 10 at a position above the slit exposure glass 13 through the conveyance path formed by the first guide member composed of the document guide member 25 while being held between the conveyance rollers 24. Then, it passes through the conveyance path formed by the first guide member 14 and the like, is nipped by the conveyance roller 26 and conveyed, is discharged by the discharge roller 27, and is placed on the discharge tray 29.

図４は両面原稿読取機能の原稿搬送経路を示す断面図である。 FIG. 4 is a cross-sectional view showing the document conveyance path of the double-sided document reading function.

原稿給紙台２０上に画像面を上側にして載置された原稿ｄは、給紙ローラ２１、分離ローラ２２、レジストローラ２３によって送り出され、搬送路切換部材Ｇ１の図示右側面を通過し、反転ローラ２８Ａに挟持されて搬送され、搬送路切換部材Ｇ２の上方の搬送路を通過し、反転ローラ２８Ｂに挟持されて一旦、排出される。この排出時には、原稿ｄの進行方向後端部は反転ローラ２８Ｂに挟持された状態に保持され、原稿ｄの第１面は下側である（図４（ａ）参照）。 A document d placed on the document feeder 20 with the image surface facing upward is sent out by a feed roller 21, a separation roller 22, and a registration roller 23, and passes through the right side of the conveyance path switching member G 1. It is nipped and conveyed by the reversing roller 28A, passes through the conveying path above the conveying path switching member G2, is nipped by the reversing roller 28B, and is discharged once. At the time of discharging, the rear end portion in the advancing direction of the document d is held between the reversing rollers 28B, and the first surface of the document d is on the lower side (see FIG. 4A).

その後、反転ローラ２８Ｂに挟持された原稿ｄは逆方向に搬送され、反転ローラ２８Ｂに挟持されて搬送され、搬送路切換部材Ｇ１の図示下面を通過し、搬送ローラ２４に挟持されて搬送され、原稿案内部材２５等により形成される搬送経路内を通過し、スリット露光用ガラス１３の上方位置において画像読取装置１０の停止状態の光学系により原稿画像の第２面が読み取られる。 Thereafter, the document d sandwiched between the reversing rollers 28B is transported in the reverse direction, sandwiched and transported by the reversing rollers 28B, passes through the lower surface of the transport path switching member G1, and is transported while being sandwiched by the transport rollers 24. The second surface of the document image is read by the stopped optical system of the image reading device 10 at a position above the slit exposure glass 13 through the conveyance path formed by the document guide member 25 and the like.

その後、原稿ｄは第１ガイド部材１４等により形成される搬送経路内を通過し、搬送ローラ２６に挟持されて搬送され、搬送路切換部材Ｇ２の下方の搬送路を通過し、反転ローラ２８Ｂに挟持されて一旦、排出される。この排出時には、原稿ｄの進行方向後端部は反転ローラ２８Ｂに挟持された状態に保持され、原稿ｄの第１面は上側となる（図４（ｂ）参照）。 Thereafter, the document d passes through the conveyance path formed by the first guide member 14 and the like, is nipped and conveyed by the conveyance roller 26, passes through the conveyance path below the conveyance path switching member G2, and reaches the reverse roller 28B. It is pinched and discharged once. At the time of discharging, the rear end portion in the advancing direction of the document d is held between the reversing rollers 28B, and the first surface of the document d is on the upper side (see FIG. 4B).

引き続き、反転ローラ２８Ｂに挟持された原稿ｄは再び逆方向に搬送され、反転ローラ２８Ｂに挟持されて搬送され、搬送路切換部材Ｇ１の図示下面を通過し、搬送ローラ２４に挟持されて搬送され、原稿案内部材２５等により形成される搬送経路内を通過し、スリット露光用ガラス１３の上方位置において画像読取装置１０の停止状態の光学系により原稿画像の第１面が読み取られる。 Subsequently, the document d sandwiched between the reversing rollers 28B is transported in the reverse direction again, sandwiched and transported by the reversing rollers 28B, passes through the lower surface of the transport path switching member G1, and is transported while being sandwiched by the transport rollers 24. Then, the first surface of the original image is read by the optical system in a stopped state of the image reading apparatus 10 at a position above the slit exposure glass 13 through the conveyance path formed by the original guide member 25 and the like.

その後、原稿ｄは第１ガイド部材１４等により形成される搬送経路内を通過し、搬送ローラ２６に挟持されて搬送され、排紙ローラ２７により排出され、原稿ｄの第１面を下側にして、排紙皿２９上に載置される（図４（ｃ）参照）。 Thereafter, the document d passes through the transport path formed by the first guide member 14 and the like, is sandwiched and transported by the transport roller 26, is discharged by the paper discharge roller 27, and the first surface of the document d is on the lower side. And placed on the paper discharge tray 29 (see FIG. 4C).

［湾曲した搬送経路の係合部］
図５（ａ）は本発明の用紙搬送装置１００の要部断面図である。なお、この図面に使用されている符号について、図７（ａ）と同じ機能を有する部分には同符号を付している。また、図７（ａ）と異なる点を説明する。 [Engagement part of curved conveyance path]
FIG. 5A is a cross-sectional view of the main part of the sheet conveying apparatus 100 of the present invention. In addition, about the code | symbol used in this drawing, the same code | symbol is attached | subjected to the part which has the same function as Fig.7 (a). Further, differences from FIG. 7A will be described.

用紙搬送装置１００は、上方に凹状に湾曲した形状をなす一対の上流側の第１ガイド部材１０１により形成された上流側搬送経路１１１と、上流側搬送経路１１１の用紙搬送方向下流側の一対の下流側の第２ガイド部材１０２により形成された下流側搬送経路１１２と、下流側搬送経路１１２の入口部の用紙搬送方向下流側に配置され用紙Ｓを挟持して搬送する１組のローラ対から成る搬送ローラ１１４とから成り、第１ガイド部材１０１の出口開口部１０１Ａと、第２ガイド部材１０２の入口開口部１０２Ａとの間に有る用紙Ｓが、一対の搬送ローラ１１４の挟持部Ｎにおける共通接線ＣＴ上に位置するように配置した。 The sheet conveying apparatus 100 includes a pair of upstream conveying paths 111 formed by a pair of upstream first guide members 101 having a concavely curved upward shape, and a pair of downstream conveying directions of the upstream conveying paths 111 in the sheet conveying direction. From a downstream conveyance path 112 formed by the downstream second guide member 102 and a pair of rollers disposed on the downstream side in the sheet conveyance direction at the inlet of the downstream conveyance path 112 and sandwiching and conveying the sheet S The sheet S between the outlet opening 101A of the first guide member 101 and the inlet opening 102A of the second guide member 102 is common to the holding part N of the pair of conveying rollers 114. It arrange | positioned so that it might be located on tangent CT.

上方に凹状に湾曲した形状をなす一対の上流側の第１ガイド部材１０１の曲率半径Ｒは、用紙Ｓの曲げ強度（腰の強さ）等により適当に設定されるが、例えば、Ｒ≒３０ｍｍである。 The curvature radius R of the pair of upstream first guide members 101 having a concavely curved shape is appropriately set according to the bending strength (stretch strength) of the paper S, for example, R≈30 mm. It is.

このように用紙搬送装置１００を、第１ガイド部材１０１の出口開口部１０１Ａの下面と、第２ガイド部材１０２の入口開口部１０２Ａの下面とに段差部ｈを形成した構成にするより、用紙Ｓの先端部通過を容易にするために第２ガイド部材１０２の入口開口部１０２Ａの下面を広く構成した段差部ｈを用紙Ｓの後端部が通過する時に、用紙Ｓの後端部が湾曲状態から平面上に復帰して、用紙Ｓの後端部が第２ガイド部材１０２の入口開口部１０２Ａを叩く事がなくなり、衝撃音の発生が解消される。 In this way, the sheet conveying apparatus 100 is configured such that the stepped portion h is formed on the lower surface of the outlet opening portion 101A of the first guide member 101 and the lower surface of the inlet opening portion 102A of the second guide member 102. When the trailing edge of the sheet S passes through a stepped portion h that is configured to have a wide lower surface of the inlet opening 102A of the second guide member 102 in order to facilitate passage of the leading edge of the sheet S, the trailing edge of the sheet S is curved. , The rear end of the sheet S does not hit the inlet opening 102A of the second guide member 102, and the generation of impact sound is eliminated.

図５（ｂ）は本発明に係る原稿移動読取型自動原稿送り装置ＤＦ１の要部断面図である。なお、この図面に使用されている符号について、図７（ｂ）と同じ機能を有する部分には同符号を付している。また、図７（ｂ）と異なる点を説明する。更に、図２と重複する説明は省略する。 FIG. 5B is a cross-sectional view of the main part of the document movement reading type automatic document feeder DF1 according to the present invention. In addition, about the code | symbol used in this drawing, the same code | symbol is attached | subjected to the part which has the same function as FIG.7 (b). Further, differences from FIG. 7B will be described. Furthermore, the description which overlaps with FIG. 2 is abbreviate | omitted.

本発明の原稿移動読取型自動原稿送り装置ＤＦ１は、上方に凹状に湾曲した形状をなし出口開口部１０１Ａを有する原稿搬送方向上流側の原稿案内部材２５と第１ガイド部材１４とから成る第１ガイド部材と、第１ガイド部材の原稿搬送方向下流側に配置され出口開口部１０１Ａより広い入口開口部１０２Ａを有する第２ガイド部材と、第２ガイド部材の入口開口部１０２Ａの原稿搬送方向下流側に配置され原稿ｄを挟持して搬送する１組のローラ対から成る搬送ローラ２６と、から構成され、画像読取装置１０の読取部において読取処理された原稿ｄが、第１ガイド部材の出口開口部１０１Ａを通過し、第２ガイド部材の入口開口部１０２Ａを通過した後、搬送ローラ２６により搬送される原稿移動読取型の自動原稿送り装置ＤＦ１において、第１ガイド部材の出口開口部１０１Ａと、第２ガイド部材の入口開口部１０２Ａとの間にある原稿ｄが搬送ローラ２６の共通接線ＣＴ上に位置するように配置した。 The document movement reading type automatic document feeder DF1 according to the present invention has a first guide member 25 and a first guide member 14 upstream of the document conveyance direction having an exit opening 101A having an upwardly curved concave shape. A guide member, a second guide member disposed downstream of the first guide member in the document conveyance direction and having an inlet opening 102A wider than the outlet opening 101A, and a downstream side of the inlet opening 102A of the second guide member in the document conveyance direction And a conveying roller 26 composed of a pair of rollers for nipping and conveying the document d, and the document d read by the reading unit of the image reading apparatus 10 is opened at the outlet of the first guide member. In the automatic document feeder DF1 of the document movement reading type, which passes through the section 101A, passes through the inlet opening 102A of the second guide member, and is transported by the transport roller 26. And an outlet opening 101A of the first guide member, the document d which is between the inlet opening 102A of the second guide member is arranged so as to be positioned on a common tangent line CT of the conveying roller 26.

上方に凹状に湾曲した形状をなす一対の上流側の第１ガイド部材の原稿案内部材２５の
曲率半径Ｒは、原稿ｄの曲げ強度（腰の強さ）等により適当に設定されるが、例えば、Ｒ≒３０ｍｍである。 The radius of curvature R of the document guide member 25 of the pair of first guide members on the upstream side that has a concavely curved shape is appropriately set depending on the bending strength (stretch strength) of the document d. , R≈30 mm.

上記の構成によって、第２ガイド部材１９の入口部の下面が広く構成された係合箇所の段差部ｈを用紙Ｓの後端部が通過する時に、用紙Ｓの後端部が湾曲状態から平面上に復帰して、用紙Ｓの後端部が第２ガイド部材１９の入口部を叩く事がなくなり、衝撃音の発生が解消される。 With the above configuration, when the rear end portion of the sheet S passes through the stepped portion h of the engagement portion where the lower surface of the inlet portion of the second guide member 19 is wide, the rear end portion of the sheet S is flat from the curved state. Returning to the top, the trailing edge of the paper S does not hit the entrance of the second guide member 19 and the generation of impact noise is eliminated.

［光学系移動読取型自動原稿送り装置ＤＦ２］
図６は、光学系移動読取型自動原稿送り装置ＤＦ２の断面図である。なお、この図面の画像読取装置１０は図２と同じ構成であるから、同符号を付して説明を省略する。 [Optical system moving reading type automatic document feeder DF2]
FIG. 6 is a sectional view of the optical system moving reading type automatic document feeder DF2. Since the image reading apparatus 10 in this drawing has the same configuration as that in FIG.

原稿給紙台３０上に画像面を上側にして載置された原稿ｄは、給紙ローラ３１、分離ローラ３２、レジストローラ３３によって送り出され、１組のローラ対から成る搬送ローラ３４に挟持されて搬送され、湾曲した形状をなす第１ガイド部材３５等により形成される搬送経路内を通過し、下流側の第２ガイド部材３６により形成される搬送経路内を通過し、１組のローラ対から成る搬送ローラ３７と搬送ベルト３８に挟持されて搬送され、原稿台ガラス１１を搬送され所定位置に停止される。 A document d placed on the document feeding table 30 with the image surface facing upward is fed out by a sheet feeding roller 31, a separation roller 32, and a registration roller 33, and is sandwiched between conveying rollers 34 formed of a pair of rollers. Pass through the conveyance path formed by the first guide member 35 and the like having a curved shape and pass through the conveyance path formed by the second guide member 36 on the downstream side. The paper is sandwiched between the transport roller 37 and the transport belt 38 and transported, and the original table glass 11 is transported and stopped at a predetermined position.

上記の構成をなす光学系移動読取型自動原稿送り装置ＤＦ２において、第２ガイド部材３６の入口開口部３６Ａを第１ガイド部材３５の出口開口部３５Ａより広くして、段差部ｈを形成し、原稿ｄの先端部導入を確実にしている。 In the optical system moving reading type automatic document feeder DF2 having the above-mentioned configuration, the step opening h is formed by making the inlet opening 36A of the second guide member 36 wider than the outlet opening 35A of the first guide member 35, The leading edge of the document d is reliably introduced.

第１ガイド部材３５の出口開口部３５Ａと、第２ガイド部材３６の入口開口部３６Ａとの間にある原稿ｄが搬送ローラ３７の共通接線上に位置することにより、段差部ｈを原稿ｄの後端部が通過する時に、原稿ｄの後端部が湾曲状態から平面上に復帰して、原稿ｄの後端部が第２ガイド部材３６の入口開口部３６Ａを叩く事がなくなり、衝撃音の発生が解消される。 The document d located between the outlet opening 35A of the first guide member 35 and the inlet opening 36A of the second guide member 36 is positioned on the common tangent line of the conveying roller 37, so that the stepped portion h is formed on the document d. When the rear end portion passes, the rear end portion of the document d returns from the curved state to the plane, and the rear end portion of the document d does not hit the entrance opening 36A of the second guide member 36. Is eliminated.

原稿台ガラス１１上の所定位置に停止された原稿ｄは、画像読取装置１０による走査露光によって原稿画像が読み取られた後、搬送ベルト３８と搬送ローラ４１とに挟持されて搬送され、湾曲した形状をなす第１ガイド部材４２により形成された上流側搬送経路を通過し、上流側搬送経路の用紙搬送方向下流側の第２ガイド部材４３により形成された下流側搬送経路を通過して、排紙ローラ４４により挟持されて排出され、排紙皿４５上に載置される。 A document d stopped at a predetermined position on the platen glass 11 is read by scanning exposure by the image reading device 10, and is then sandwiched and transported between a transport belt 38 and a transport roller 41 to have a curved shape. Passing through the upstream transport path formed by the first guide member 42 forming the first sheet, and passing through the downstream transport path formed by the second guide member 43 on the downstream side of the upstream transport path in the sheet transport direction. The paper is sandwiched and discharged by the rollers 44 and placed on a paper discharge tray 45.

第２ガイド部材４３の入口開口部４３Ａを第１ガイド部材４２の出口開口部４２Ａより広くして、段差部ｈを形成し、原稿ｄの先端部導入を確実にしている。 The entrance opening 43A of the second guide member 43 is wider than the exit opening 42A of the first guide member 42 to form a stepped portion h to ensure the introduction of the leading end of the document d.

第１ガイド部材４２の出口開口部４２Ａと、第２ガイド部材４３の入口開口部４３Ａとの間にある原稿ｄが排紙ローラ４４の共通接線上に位置することにより、段差部ｈを原稿ｄの後端部が通過する時に、原稿ｄの後端部が湾曲状態から平面上に復帰して、原稿ｄの後端部が第２ガイド部材４３の入口開口部４３Ａを叩く事がなくなり、衝撃音の発生が解消される。 Since the document d between the outlet opening 42A of the first guide member 42 and the inlet opening 43A of the second guide member 43 is positioned on the common tangent line of the paper discharge roller 44, the stepped portion h is changed to the document d. When the trailing edge of the document passes, the trailing edge of the document d returns from the curved state to the flat surface, and the trailing edge of the document d does not hit the entrance opening 43A of the second guide member 43, and the impact is reduced. Sound generation is eliminated.

本発明の用紙搬送装置は、画像形成装置本体Ａの反転搬送手段９において、湾曲した形状をなす用紙搬送経路ｐ１，ｐ２，ｐ３（図１参照）の各出口開口部と各入口開口部とが近接する箇所にも、図５（ａ）に示した配置を適用して、同様の効果が得られる。 In the sheet conveying apparatus of the present invention, in the reverse conveying unit 9 of the image forming apparatus main body A, the outlet openings and the inlet openings of the curved sheet conveying paths p1, p2, and p3 (see FIG. 1) are provided. The same effect can be obtained by applying the arrangement shown in FIG.

画像形成装置本体、画像読取装置、自動原稿送り装置から成る画像形成装置の全体構成図。1 is an overall configuration diagram of an image forming apparatus including an image forming apparatus main body, an image reading apparatus, and an automatic document feeder. 画像読取部及び自動原稿送り装置の要部断面図。FIG. 3 is a cross-sectional view of a main part of an image reading unit and an automatic document feeder. 片面原稿読取機能の原稿搬送経路を示す断面図。Sectional drawing which shows the original conveyance path | route of a single-sided original reading function. 両面原稿読取機能の原稿搬送経路を示す断面図。Sectional drawing which shows the original conveyance path | route of a double-sided original reading function. 本発明の用紙搬送装置及び原稿移動読取型の自動原稿送り装置の要部断面図。FIG. 3 is a cross-sectional view of a main part of the sheet conveying device and the document movement reading type automatic document feeder according to the present invention. 光学系移動読取型の自動原稿送り装置の断面図。FIG. 2 is a cross-sectional view of an optical document moving type automatic document feeder. 従来の用紙搬送装置及び自動原稿送り装置の要部断面図。Sectional drawing of the principal part of the conventional paper conveying apparatus and automatic document feeder.

符号の説明Explanation of symbols

９反転搬送手段（ＡＤＵ）
１０画像読取装置
１１原稿台ガラス
１３スリット露光用ガラス
１４第１ガイド部材
１９第２ガイド部材
２０原稿給紙台
２４，２６，３４，３７，４１，１０３，１０４，１１４搬送ローラ
２５原稿案内部材（上流側ガイド部材）
３０原稿給紙台
３５，４２，１０１第１ガイド部材
３６，４３，１０２第２ガイド部材
４４排紙ローラ
１００用紙搬送装置
１０１Ａ出口開口部
１０２Ａ入口開口部
１１１上流側搬送経路
１１２下流側搬送経路
Ａ画像形成装置本体
ＣＴ共通接線
ＤＦ１原稿移動読取型自動原稿送り装置
ＤＦ２光学系移動読取型自動原稿送り装置
Ｎ挟持部
Ｓ用紙
ｄ原稿
ｈ段差部 9 Reverse conveying means (ADU)
DESCRIPTION OF SYMBOLS 10 Image reading apparatus 11 Document glass 13 Slit exposure glass 14 1st guide member 19 2nd guide member 20 Document feeder 24,26,34,37,41,103,104,114 Conveyance roller 25 Document guide member ( Upstream guide member)
30 Document feeder 35, 42, 101 First guide member 36, 43, 102 Second guide member 44 Paper discharge roller 100 Paper transport device 101A Exit opening 102A Inlet opening 111 Upstream transport path 112 Downstream transport path A Image forming apparatus main body CT Common tangent line DF1 Document moving reading type automatic document feeder DF2 Optical system moving reading type automatic document feeder N Nipping part S Paper d Document h Step part

Claims

湾曲した形状をなし出口開口部を有する用紙搬送方向上流側の第１ガイド部材と、
前記第１ガイド部材の用紙搬送方向下流側に配置され前記出口開口部より広い入口開口部を有する第２ガイド部材と、
前記第２ガイド部材の入口開口部の用紙搬送方向下流側に配置され用紙を挟持して搬送する１組のローラ対から成る搬送ローラと、
から構成され、前記第１ガイド部材の出口開口部を通過した用紙が前記第２ガイド部材の入口開口部を通過した後、前記搬送ローラにより搬送される用紙搬送装置において、
用紙の後端部が前記第１ガイド部材の湾曲部下流の出口開口部と前記第２ガイド部材の入口開口部との間を通過する際に、前記搬送ローラの共通接線上を通るような位置関係に前記搬送ローラの互いのローラを配置したことを特徴とする用紙搬送装置。 A first guide member having a curved shape and having an outlet opening, upstream of the sheet conveying direction;
A second guide member disposed on the downstream side of the first guide member in the sheet conveying direction and having an inlet opening wider than the outlet opening;
A transport roller comprising a pair of rollers disposed downstream of the inlet opening of the second guide member in the paper transport direction and sandwiching and transporting the paper;
In the sheet conveying apparatus, the sheet having passed through the outlet opening of the first guide member is conveyed by the conveying roller after passing through the inlet opening of the second guide member.
When the trailing end of the sheet passes between the inlet opening of the first guide member bend downstream of the outlet opening and the front Stories second guide member, such as to pass over the common tangent of the transport roller A sheet conveying apparatus , wherein the rollers of the conveying rollers are arranged in a positional relationship .

湾曲した形状をなし出口開口部を有する原稿搬送方向上流側の第１ガイド部材と、
前記第１ガイド部材の原稿搬送方向下流側に配置され前記出口開口部より広い入口開口部を有する第２ガイド部材と、
前記第２ガイド部材の入口開口部の原稿搬送方向下流側に配置され原稿を挟持して搬送する１組のローラ対から成る搬送ローラと、
から構成され、画像読取装置の読取部において読取処理された原稿が、前記第１ガイド部材の出口開口部を通過し、前記第２ガイド部材の入口開口部を通過した後、前記搬送ローラにより搬送される原稿移動読取型の自動原稿送り装置において、
原稿の後端部が前記第１ガイド部材の湾曲部下流の出口開口部と前記第２ガイド部材の入口開口部との間を通過する際に、前記搬送ローラの共通接線上を通るような位置関係に前記搬送ローラの互いのローラを配置したことを特徴とする自動原稿送り装置。 A first guide member having a curved shape and having an exit opening, on the upstream side in the document conveying direction;
A second guide member disposed downstream of the first guide member in the document conveying direction and having an inlet opening wider than the outlet opening;
A conveyance roller comprising a pair of rollers disposed on the downstream side in the document conveyance direction of the inlet opening of the second guide member and configured to sandwich and convey the document;
The original that has been read by the reading unit of the image reading apparatus passes through the outlet opening of the first guide member, passes through the inlet opening of the second guide member, and is then transported by the transport roller. In a document moving and reading type automatic document feeder,
When the rear end of the document passes between the inlet opening of the first guide member bend downstream of the outlet opening and the front Stories second guide member, such as to pass over the common tangent of the transport roller An automatic document feeder , wherein the rollers of the conveying rollers are arranged in a positional relationship .

湾曲した形状をなし出口開口部を有する原稿搬送方向上流側の第１ガイド部材と、
前記第１ガイド部材の原稿搬送方向下流側に配置され前記出口開口部より広い入口開口部を有する第２ガイド部材と、
前記第２ガイド部材の入口開口部の原稿搬送方向下流側に配置され原稿を挟持して搬送する１組のローラ対から成る搬送ローラと、
から構成され、画像読取装置の読取部において前記原稿を停止させて読取処理したのち、前記搬送ローラにより挟持して前記原稿を前記読取部から排出する光学系移動読取型の自動原稿送り装置において、
原稿の後端部が前記第１ガイド部材の湾曲部下流の出口開口部と前記第２ガイド部材の入口開口部との間を通過する際に、前記搬送ローラの共通接線上を通るような位置関係に前記搬送ローラの互いのローラを配置したことを特徴とする自動原稿送り装置。 A first guide member having a curved shape and having an exit opening, on the upstream side in the document conveying direction;
A second guide member disposed downstream of the first guide member in the document conveying direction and having an inlet opening wider than the outlet opening;
A conveyance roller comprising a pair of rollers disposed on the downstream side in the document conveyance direction of the inlet opening of the second guide member and configured to sandwich and convey the document;
In the optical document moving reading type automatic document feeder, the reading unit of the image reading apparatus stops the document and performs a reading process, and then sandwiches it by the transport roller and discharges the document from the reading unit.
When the rear end of the document passes between the inlet opening of the first guide member bend downstream of the outlet opening and the front Stories second guide member, such as to pass over the common tangent of the transport roller automatic document feeder, characterized in that arranging the mutual rollers of the conveying roller on the positional relationship.

画像形成装置の画像形成部において画像形成された用紙を反転搬送させる反転搬送手段に、請求項１に記載の第１ガイド、第２ガイド部材、搬送ローラを配置したことを特徴とする画像形成装置。 The image forming apparatus according to claim 1, wherein the first guide, the second guide member, and the conveying roller according to claim 1 are arranged in a reversing conveyance unit that reversely conveys the sheet on which the image is formed in the image forming unit of the image forming apparatus. .