JP5538292B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP5538292B2
JP5538292B2 JP2011090593A JP2011090593A JP5538292B2 JP 5538292 B2 JP5538292 B2 JP 5538292B2 JP 2011090593 A JP2011090593 A JP 2011090593A JP 2011090593 A JP2011090593 A JP 2011090593A JP 5538292 B2 JP5538292 B2 JP 5538292B2
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cover
image forming
guide member
reversing
forming apparatus
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JP2012225963A (en
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友宏 綿谷
陽平 野口
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Kyocera Document Solutions Inc
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Kyocera Document Solutions Inc
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Description

本発明は、複写機、プリンター、ファクシミリ、それらの複合機等の画像形成装置に関し、特に、装置上方に位置する定着部のジャム処理機構を有する画像形成装置に関するものである。 The present invention relates to an image forming apparatus such as a copying machine, a printer, a facsimile, or a composite machine thereof, and more particularly to an image forming apparatus having a jam processing mechanism of a fixing unit located above the apparatus.

従来、プリンターやその複合機等の画像形成装置では、画像形成部で画像形成処理が施され、画像形成部によってトナー像が転写された用紙を縦方向に向けて形成された用紙搬送路に沿って搬送し、用紙搬送路の上方に配置された定着部で用紙へのトナー像の定着処理を施した後、定着部の上方に設けられた排出部へ用紙を排出するようになっているものがある。このような構成では、通常、側面カバーが画像形成装置の装置本体の側壁に開閉可能に設けられ、用紙搬送路および定着部は側面カバーの直ぐ内側に配設されている。従って、用紙搬送路あるいは定着部で紙詰りが生じたときには、この側面カバーを開放することにより紙詰まりの生じた位置が外部に露出されるため、紙詰りの解消作業を容易に行うことができる。   2. Description of the Related Art Conventionally, in an image forming apparatus such as a printer or a multifunction peripheral, an image forming process is performed in an image forming unit, and a sheet on which a toner image is transferred by the image forming unit is formed along a sheet conveyance path formed in a vertical direction. The toner image is fixed on the paper by the fixing unit arranged above the paper conveyance path, and then the paper is discharged to the discharge unit provided above the fixing unit. There is. In such a configuration, the side cover is normally provided on the side wall of the apparatus main body of the image forming apparatus so as to be openable and closable, and the sheet conveyance path and the fixing unit are disposed immediately inside the side cover. Therefore, when a paper jam occurs in the paper conveyance path or the fixing unit, the position where the paper jam occurs is exposed to the outside by opening the side cover, so that the paper jam clearing operation can be easily performed. .

例えば、特許文献1に記載の画像形成装置は、トナー像の形成された用紙を定着部に向けて縦方向に搬送する用紙搬送路と、装置本体の上部に定着処理後の用紙が排出される排出部と、用紙搬送路及び定着部を覆う開閉自在の側面カバーと、側面カバーの開閉動作に連動して加圧ローラーによる加圧状態と加圧の解除状態とに状態を変化させる状態変化機構と、を備える。側面カバーの閉動作によって、状態変化機構が加圧状態に設定され定着処理が可能となり、側面カバーの開動作によって、状態変化機構が加圧の解除状態に設定され定着部での紙詰りの解消操作を行うことが可能となる。   For example, in the image forming apparatus described in Patent Document 1, a sheet carrying path on which a toner image is formed is conveyed in a vertical direction toward a fixing unit, and a sheet after fixing processing is discharged to the upper part of the apparatus main body. A state change mechanism that changes the state between a pressurization state and a pressure release state by a pressure roller in conjunction with the opening / closing operation of the side cover, and a side cover that can be freely opened and closed to cover the discharge unit, the paper conveyance path and the fixing unit And comprising. When the side cover is closed, the state change mechanism is set to the pressurized state and fixing processing is possible, and when the side cover is opened, the state change mechanism is set to the release state of pressure and the paper jam at the fixing unit is eliminated. The operation can be performed.

特開2008−122744号公報(特許請求項、第1図)JP 2008-122744 A (Patent Claim, FIG. 1)

近年、プリンターやその複合機等の画像形成装置は、両面印刷が可能になってきている。両面印刷を可能とするために、画像形成後さらに定着処理した用紙を排出部に搬送する用紙搬送路とともに、一方の面に画像形成した用紙を反転させて画像形成部へ再搬送する反転搬送路が必要である。反転搬送路は、定着部と排出部との間の用紙搬送路から分岐して再度画像形成部に向う搬送路であり、通常、縦方向に延びる用紙搬送路と側面カバーとの間に形成される。このような構成の画像形成装置において、定着部で紙詰りが生じたとき、ジャム処理のために、側面カバーを開放しても、反転搬送路の奥に定着部が配置されているので、定着部に詰まった用紙を取り除くのが難しいという問題があった。   In recent years, image forming apparatuses such as printers and multifunction peripherals have become capable of duplex printing. In order to enable double-sided printing, together with a paper transport path that transports the fixed paper after image formation to the discharge section, a reverse transport path that reverses the image-formed paper on one side and transports it again to the image forming section is necessary. The reverse conveyance path is a conveyance path that branches from the sheet conveyance path between the fixing unit and the discharge unit and again faces the image forming unit, and is usually formed between the sheet conveyance path that extends in the vertical direction and the side cover. The In the image forming apparatus having such a configuration, when a paper jam occurs in the fixing unit, the fixing unit is disposed at the back of the reverse conveyance path even if the side cover is opened for jamming. There was a problem that it was difficult to remove the paper jammed in the section.

本発明は、上記のような課題を解決するためになされたものであり、用紙の反転搬送路を備えていても簡単な操作にて定着部のジャム処理が行える画像形成装置を提供することを目的とする。   SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus capable of performing jam processing of a fixing unit with a simple operation even if a paper reverse conveyance path is provided. Objective.

上記目的を達成するために第1の発明の画像形成装置は、像担持体上に形成されたトナー像を記録媒体上に転写する画像形成部と、該画像形成部において記録媒体上に転写されたトナー像を記録媒体上に溶融定着する定着部と、該定着部によりトナー像が定着された記録媒体を排出する排出部と、記録媒体を前記画像形成部から前記排出部へと搬送するための用紙搬送路と、装置本体の上面及び側面に沿って延設され、一方の面に画像形成がなされた記録媒体を反転させて前記画像形成部へと再搬送するための反転搬送路と、装置本体の上側にて前記定着部を覆うように揺動可能に配置され、搬送ガイド面にて前記用紙搬送路の一部を形成する一方、前記搬送ガイド面の反対側に向き合う反転ガイド面にて前記反転搬送路の一部を形成する反転ガイド部材と、装置本体の上面に対して回動可能に支持され、回動動作によって装置本体の上面を開閉可能とする上面カバーと、該上面カバーの開閉動作に連動して、前記反転ガイド部材を、前記定着部を露出させる位置と、前記定着部を覆う位置とに揺動させる駆動機構と、を備えることを特徴としている。   In order to achieve the above object, an image forming apparatus according to a first aspect of the present invention includes an image forming unit that transfers a toner image formed on an image carrier onto a recording medium, and the image forming unit that transfers the toner image onto the recording medium. A fixing unit that melts and fixes the toner image on the recording medium, a discharge unit that discharges the recording medium on which the toner image is fixed by the fixing unit, and a conveyance of the recording medium from the image forming unit to the discharge unit. A reversing conveyance path for reversing a recording medium that is extended along the upper and side surfaces of the apparatus main body and on which image formation has been performed, and reconveying to the image forming unit, A reversing guide surface is disposed on the upper side of the apparatus body so as to be able to swing so as to cover the fixing unit, and forms a part of the sheet transport path on the transport guide surface, while facing the opposite side of the transport guide surface. To form a part of the reverse conveying path. A guide member, an upper surface cover that is pivotally supported with respect to the upper surface of the apparatus main body, and that can open and close the upper surface of the apparatus main body by a rotation operation; And a drive mechanism that swings between a position that exposes the fixing unit and a position that covers the fixing unit.

また、第2の発明では、上記の画像形成装置において、前記駆動機構は、前記反転ガイド部材の揺動中心を構成する第1回転軸と、該第1回転軸から第1の距離だけ離間して前記反転ガイド部材に設けられた第1係合部と、前記上面カバーの回動中心を構成する第2回転軸と、該第2回転軸から第2の距離だけ離間して前記上面カバーに設けられ前記第1係合部に係合可能である第2係合部と、を備え、前記上面カバーの開方向への回動動作に連動して、前記第2係合部が前記第2回転軸を中心として回動することによって、前記第1係合部が持ち上げられ、前記反転ガイド部材が前記第1回転軸を中心として揺動することを特徴としている。   According to a second aspect of the present invention, in the above image forming apparatus, the drive mechanism is separated from the first rotation shaft that forms the swing center of the reversing guide member by a first distance from the first rotation shaft. A first engaging portion provided on the reversing guide member, a second rotating shaft constituting a rotation center of the upper surface cover, and a second distance away from the second rotating shaft. A second engagement portion that is provided and engageable with the first engagement portion, and the second engagement portion is coupled to the second engagement portion in conjunction with a rotation operation of the upper surface cover in the opening direction. By rotating about a rotation axis, the first engagement portion is lifted, and the reversing guide member swings about the first rotation axis.

また、第3の発明では、上記の画像形成装置において、前記第1係合部は下面が係合面となる凹面状に形成され、前記第2係合部は前記第1係合部の係合面に当接可能である上面を有するフック形状に形成されることを特徴としている。   According to a third aspect of the present invention, in the above image forming apparatus, the first engagement portion is formed in a concave shape whose lower surface is an engagement surface, and the second engagement portion is associated with the first engagement portion. It is characterized by being formed in a hook shape having an upper surface capable of abutting against the mating surface.

また、第4の発明では、上記の画像形成装置において、前記第1の距離は前記第2の距離より小さく構成されることを特徴としている。   According to a fourth aspect of the present invention, in the above image forming apparatus, the first distance is configured to be smaller than the second distance.

また、第5の発明では、上記の画像形成装置において、装置本体の側面に対して回動可能に支持され、回動動作によって装置本体の側面を開閉可能とし、開方向の回動によって前記反転搬送路を装置本体から露出させる側面カバーをさらに備え、前記上面カバーの開方向への回動動作によって、前記上面カバーは、前記側面カバー側が開放されるように構成されるとともに、前記反転ガイド部材は、前記定着部が前記側面カバー側に向けて装置本体から露出するように構成されることを特徴されることを特徴としている。   According to a fifth aspect of the present invention, in the above image forming apparatus, the side surface of the apparatus main body is rotatably supported with respect to the side surface of the apparatus main body, and the side surface of the apparatus main body can be opened and closed by rotating operation. The reversing guide member is further provided with a side cover that exposes the conveyance path from the apparatus main body, and the upper surface cover is configured to open the side cover side by rotating the upper surface cover in the opening direction. Is characterized in that the fixing portion is configured to be exposed from the apparatus main body toward the side cover side.

また、第6の発明では、上記の画像形成装置において、前記上面カバーは、装置本体の上面を形成するカバー部材と、前記反転ガイド面に対向して配置される搬送ガイド部材とを有することを特徴としている。   According to a sixth aspect of the present invention, in the above image forming apparatus, the upper surface cover includes a cover member that forms an upper surface of the apparatus main body, and a conveyance guide member that is disposed to face the reversing guide surface. It is a feature.

第1の発明によれば、定着部にて紙詰まりが生じた場合、装置本体の上面を覆う上面カバーを開くと、上面カバーの開方向への回動動作に連動して、駆動機構によって反転ガイド部材が揺動し、反転ガイド部材に覆われた定着部が反転ガイド部材から露出する。この状態で、定着部に詰まった記録媒体を取り除くことができる。従って、両面印刷のために反転搬送路を備えていても簡単な操作にて定着部のジャム処理が行える。   According to the first invention, when a paper jam occurs in the fixing unit, when the upper surface cover that covers the upper surface of the apparatus main body is opened, it is reversed by the drive mechanism in conjunction with the rotation operation of the upper surface cover in the opening direction. The guide member swings, and the fixing portion covered with the reverse guide member is exposed from the reverse guide member. In this state, the recording medium jammed in the fixing unit can be removed. Therefore, even if a reverse conveyance path is provided for double-sided printing, jamming of the fixing unit can be performed with a simple operation.

本発明の実施形態に係る画像形成装置の全体構成を概略的に示す図1 is a diagram schematically illustrating an overall configuration of an image forming apparatus according to an embodiment of the present invention. 実施形態に係る画像形成装置の定着部の周辺を示す平面図FIG. 3 is a plan view showing the periphery of the fixing unit of the image forming apparatus according to the embodiment. 実施形態に係る画像形成装置の反転ガイド部材を示す斜視図FIG. 3 is a perspective view illustrating a reverse guide member of the image forming apparatus according to the embodiment. 実施形態に係る画像形成装置の上面カバーを示す斜視図1 is a perspective view showing a top cover of an image forming apparatus according to an embodiment. 実施形態に係る上面カバーのカバー部材を示す斜視図The perspective view which shows the cover member of the upper surface cover which concerns on embodiment 実施形態に係る上面カバーの搬送ガイド部材を示す斜視図The perspective view which shows the conveyance guide member of the upper surface cover which concerns on embodiment 実施形態に係る画像形成装置の駆動機構を模式的に示す断面図Sectional drawing which shows typically the drive mechanism of the image forming apparatus which concerns on embodiment 実施形態に係る画像形成装置の上面カバーを開いた状態の定着部の周辺を示す平面図FIG. 3 is a plan view showing the periphery of the fixing unit in a state where the top cover of the image forming apparatus according to the embodiment is opened.

以下に本発明の実施形態について図面を参照して説明するが、本発明は、この実施形態に限定されない。また発明の用途やここで示す用語等はこれに限定されるものではない。   Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. Further, the use of the invention and the terms shown here are not limited thereto.

図1は、胴内排紙方式の画像形成装置の全体構成を示す図である。画像形成装置100の下部には、カセットタイプの用紙給紙部10が配設されている。用紙給紙部10は上下2段の給紙カセット10a、10bを有し、給紙カセット10a、10bには印刷前の用紙が積載して収容されている。給紙カセット10a、10bに収容された用紙は、選択された給紙カセット10a(10b)から用紙ピックアップローラー10d(10e)により1枚ずつ繰り出され、繰り出された用紙は用紙搬送路11へと送り出される。   FIG. 1 is a diagram illustrating an overall configuration of an in-body discharge type image forming apparatus. Under the image forming apparatus 100, a cassette type paper feeding unit 10 is disposed. The paper feeding unit 10 has upper and lower two-stage paper feeding cassettes 10a and 10b, and sheets before printing are stacked and stored in the paper feeding cassettes 10a and 10b. The sheets housed in the sheet feeding cassettes 10a and 10b are fed out one by one from the selected sheet feeding cassette 10a (10b) by the sheet pickup roller 10d (10e), and the fed out sheets are sent out to the sheet transport path 11. It is.

画像形成装置100の右側面には、手差しトレー10cが配設されている。手差しトレー10cは、給紙カセット10a、10bと異なるサイズの用紙が載置可能である。手差しトレー10cに載置された用紙は用紙搬送路11へと送り出される。   A manual feed tray 10 c is disposed on the right side surface of the image forming apparatus 100. The manual feed tray 10c can be loaded with paper having a size different from that of the paper feed cassettes 10a and 10b. The paper placed on the manual feed tray 10 c is sent out to the paper transport path 11.

用紙搬送路11は、用紙給紙部10の左方にて装置本体2の上下方向に延設される。用紙給紙部10から送り出された用紙が、用紙搬送路11上方のレジストローラー対12に搬送される。レジストローラー対12は、用紙にトナー像を転写するタイミングと同期をとって、画像形成部3に向けて用紙を送り出す。   The sheet conveyance path 11 extends in the vertical direction of the apparatus main body 2 on the left side of the sheet feeding unit 10. The sheet fed from the sheet feeding unit 10 is conveyed to the registration roller pair 12 above the sheet conveying path 11. The registration roller pair 12 sends the paper toward the image forming unit 3 in synchronization with the timing of transferring the toner image onto the paper.

画像形成装置100の上部には原稿読取装置6が配設され、原稿読取装置6の上面には、プラテン(原稿押さえ)24が開閉可能に設けられ、さらに、プラテン24上には原稿搬送装置27が付設されている。原稿のコピーを行う場合、原稿搬送装置27に載置された原稿が1枚ずつ分離されて原稿読取部に送り出され、原稿読取装置6によって原稿の画像データが読み取られる。   A document reading device 6 is disposed above the image forming apparatus 100, and a platen (document pressing) 24 is provided on the upper surface of the document reading device 6 so as to be openable and closable. Is attached. When copying an original, the originals placed on the original conveying device 27 are separated one by one and sent to the original reading unit, and the original reading device 6 reads the image data of the original.

画像形成装置100の略中央部には、画像形成部3が配設されている。画像形成部3は、像担持体である感光体5を備え、さらに感光体5の周辺にその回転方向(図中のA方向)に沿って順に、帯電部4と、露光ユニット7と、現像部8と、転写ローラー13、及びクリーニング部18を備える。現像部8へのトナーの供給はトナーコンテナ9から行われる。クリーニング部18は、ブレードやブラシ或いは研磨ローラー等のクリーニング部材を有し、クリーニング部材によって感光体5の表面に残留するトナーを剥ぎ取り、回収する。   An image forming unit 3 is disposed substantially at the center of the image forming apparatus 100. The image forming unit 3 includes a photoconductor 5 that is an image carrier, and further, around the photoconductor 5 in order along its rotation direction (A direction in the drawing), a charging unit 4, an exposure unit 7, and a developing unit. A unit 8, a transfer roller 13, and a cleaning unit 18 are provided. The toner is supplied to the developing unit 8 from the toner container 9. The cleaning unit 18 includes a cleaning member such as a blade, a brush, or a polishing roller, and removes and collects toner remaining on the surface of the photoreceptor 5 by the cleaning member.

感光体5の表面が帯電部4によって所定の極性および電位で一様に帯電されると、 露光ユニット7は、原稿読取装置6によって読み取られた原稿の画像データに基づいて、感光体5上に原稿画像の静電潜像を形成する。   When the surface of the photoreceptor 5 is uniformly charged with a predetermined polarity and potential by the charging unit 4, the exposure unit 7 is placed on the photoreceptor 5 based on the image data of the document read by the document reader 6. An electrostatic latent image of the original image is formed.

現像部8は、帯電したトナーを感光体5の表面に供給し、感光体5上の静電潜像を現像してトナー像を形成する。トナー像は転写ローラー13によって用紙上に転写される。トナー像が転写された用紙は、用紙搬送路11の上方に配設される定着部14へと搬送される。用紙にトナー像が転写された後、感光体5の表面に残留するトナーがクリーニング部18によってクリーニングされて回収され、さらに図示しない除電装置によって感光体5の表面の残留電荷が除去される。   The developing unit 8 supplies charged toner to the surface of the photoconductor 5 and develops the electrostatic latent image on the photoconductor 5 to form a toner image. The toner image is transferred onto the paper by the transfer roller 13. The sheet on which the toner image has been transferred is conveyed to a fixing unit 14 disposed above the sheet conveyance path 11. After the toner image is transferred to the paper, the toner remaining on the surface of the photoconductor 5 is cleaned and collected by the cleaning unit 18, and the residual charge on the surface of the photoconductor 5 is removed by a static elimination device (not shown).

定着部14は、熱源を内蔵する定着ローラー14aと加圧ローラー14bとを有し、トナー像が転写された用紙を定着ローラー14a及び加圧ローラー14bによって加圧加熱し、用紙上のトナー像を溶融定着させる。トナー像が定着された用紙は、用紙搬送路11において右上方に搬送され排出ローラー対20によって排出部である胴内排紙部17に排出される。   The fixing unit 14 includes a fixing roller 14a having a built-in heat source and a pressure roller 14b, and pressurizes and heats the paper on which the toner image has been transferred by the fixing roller 14a and the pressure roller 14b, thereby converting the toner image on the paper. Melt and fix. The sheet on which the toner image is fixed is conveyed to the upper right in the sheet conveyance path 11 and is discharged by the discharge roller pair 20 to the in-body discharge unit 17 which is a discharge unit.

定着部14と排出ローラー対20との間の用紙搬送路11から分岐して反転搬送路16が設けられる。反転搬送路16は、用紙の一方の面にトナー像が定着された後、必要に応じて用紙の他方の面にもトナー像を形成するときに用いられるものであり、定着部14の上方から定着部14の周りを覆い、さらに用紙搬送路11と装置本体2の側面2aとの間を下方に延設され、レジストローラー対12の近傍の用紙搬送路11に合流している。   A reverse conveyance path 16 is provided that branches from the sheet conveyance path 11 between the fixing unit 14 and the discharge roller pair 20. The reverse conveyance path 16 is used when a toner image is fixed on one side of the paper and then formed on the other side of the paper as needed. It covers the periphery of the fixing unit 14, further extends downward between the sheet conveyance path 11 and the side surface 2 a of the apparatus main body 2, and merges with the sheet conveyance path 11 near the registration roller pair 12.

両面印刷を行う場合には、一方の面にトナー像が定着された用紙は、胴内排紙部17に排出させる途中において、用紙搬送路11と反転搬送路16との分岐部を用紙の後端が通過したタイミングで排出ローラー対20を逆回転させる。これによって、用紙がスイッチバックされ、用紙の印刷面が表裏逆向きにされた状態で反転搬送路16に送られ、反転搬送路16から再び用紙搬送路11のレジストローラー対12に搬送される。その後、画像形成部3にて用紙の他方の面にもトナー像が転写されると、用紙は定着部14によって定着処理され胴内排紙部17に排出される。   When performing double-sided printing, the paper on which the toner image is fixed on one side of the paper is discharged to the in-body paper discharge unit 17 while the branch portion between the paper conveyance path 11 and the reverse conveyance path 16 is moved to the rear of the paper. The discharge roller pair 20 is reversely rotated at the timing when the end passes. As a result, the paper is switched back, sent to the reverse conveyance path 16 with the printing surface of the paper turned upside down, and conveyed from the reverse conveyance path 16 to the registration roller pair 12 of the paper conveyance path 11 again. Thereafter, when the toner image is transferred to the other side of the sheet by the image forming unit 3, the sheet is fixed by the fixing unit 14 and discharged to the in-body sheet discharge unit 17.

定着部14と、その周辺に配置される反転搬送路16とは、図2に示すように構成される。図2は、定着部14の周辺を示す平面図である。尚、図2は、図1の裏面側から見た平面図であり、従って、装置本体2の側面2aが図2の右側に示され、また、胴内排紙部17が図2の左側に示される。   The fixing unit 14 and the reverse conveyance path 16 disposed around the fixing unit 14 are configured as shown in FIG. FIG. 2 is a plan view showing the periphery of the fixing unit 14. 2 is a plan view seen from the back side of FIG. 1, and accordingly, the side surface 2a of the apparatus main body 2 is shown on the right side of FIG. 2, and the in-body discharge section 17 is on the left side of FIG. Indicated.

定着部14の周辺には、排出ガイド部材61と、排出ローラー対20と、反転ガイド部材62と、上面カバー51と、側面カバー55とが配設される。   A discharge guide member 61, a discharge roller pair 20, a reverse guide member 62, a top cover 51, and a side cover 55 are disposed around the fixing unit 14.

排出ガイド部材61は、定着部14に対して用紙搬送路11の下流側で、且つ定着ローラー14aに隣接して配置される。排出ガイド部材61には、搬送ガイド面61aが形成される。搬送ガイド面61aは、定着ローラー14aの上方から排出ローラー対20まで円弧状に形成され、定着処理された用紙を定着部14から排出ローラー対20に案内する。   The discharge guide member 61 is disposed on the downstream side of the sheet conveyance path 11 with respect to the fixing unit 14 and adjacent to the fixing roller 14a. A conveyance guide surface 61 a is formed on the discharge guide member 61. The conveyance guide surface 61 a is formed in an arc shape from above the fixing roller 14 a to the discharge roller pair 20, and guides the fixed sheet from the fixing unit 14 to the discharge roller pair 20.

排出ローラー対20は、第2支軸20cに固着され上側に配置される排出ローラー20aと、排出ローラー20aの下側に配置され排出ローラー20aに押圧されるコロ20bとを有し、第2支軸20cが回転駆動すると、排出ローラー20aが回転するとともにコロ20bが従動回転し、用紙が胴内排紙部17に排出される。   The discharge roller pair 20 includes a discharge roller 20a fixed to the second support shaft 20c and disposed on the upper side, and a roller 20b disposed on the lower side of the discharge roller 20a and pressed against the discharge roller 20a. When the shaft 20 c is rotationally driven, the discharge roller 20 a rotates and the roller 20 b is driven to rotate, and the sheet is discharged to the in-body discharge unit 17.

反転ガイド部材62は、加圧ローラー14b外周の上側及び右側面を覆うように配置される。反転ガイド部材62には、搬送ガイド面62aと反転ガイド面62bが形成される。   The reverse guide member 62 is disposed so as to cover the upper and right sides of the outer periphery of the pressure roller 14b. The reverse guide member 62 is formed with a conveyance guide surface 62a and a reverse guide surface 62b.

搬送ガイド面62aは、排出ガイド部材61の搬送ガイド面61aに対向して配置され、加圧ローラー14bの上方から排出ローラー対20に向かって分岐部62cまで延びて形成される。従って、搬送ガイド面62aは、排出ガイド部材61の搬送ガイド面61aとともに、定着処理された用紙を定着部14から排出ローラー対20に向けて案内する。
尚、分岐部62cは、用紙搬送路11と反転搬送路16と略交差する位置に設けられる。
The conveyance guide surface 62a is disposed to face the conveyance guide surface 61a of the discharge guide member 61, and is formed to extend from the upper side of the pressure roller 14b to the branching portion 62c toward the discharge roller pair 20. Accordingly, the conveyance guide surface 62 a guides the fixed sheet from the fixing unit 14 toward the discharge roller pair 20 together with the conveyance guide surface 61 a of the discharge guide member 61.
Note that the branching portion 62 c is provided at a position that substantially intersects the paper conveyance path 11 and the reverse conveyance path 16.

反転ガイド面62bは、搬送ガイド面62aの反対側に向き合い、分岐部62cから装置本体2の側面2a側まで延びて設けられる。反転ガイド面62bは、上面カバー51に対し略平行に対向しているが、分岐部62c側の面が下方に緩やかに傾斜し、また、装置本体2の側面2a側の面が下方に向けて円弧状に形成される。従って、用紙の後端が分岐部62cを通過した用紙は、排出ローラー対20が逆回転すると、反転ガイド面62bの分岐部62c側の面によって上面カバー51に対して略平行に案内された後、反転ガイド面62bの側面2a側の面によって円弧状に下方に案内され、図示しない搬送ガイドによって、装置本体2の側面2aと略平行に案内される。さらに、用紙は、反転搬送路16から用紙搬送路11のレジストローラー対12(図1参照)に搬送される。尚、分岐部62c側の面が下方に緩やかに傾斜することで、用紙搬送路11から分岐部62cを通過した用紙が、用紙搬送路11に戻ることなく、滑らかに反転搬送路16に案内される。   The reverse guide surface 62b faces the opposite side of the conveyance guide surface 62a and extends from the branch portion 62c to the side surface 2a side of the apparatus main body 2. The reversing guide surface 62b faces the upper surface cover 51 substantially in parallel, but the surface on the branching portion 62c side is gently inclined downward, and the surface on the side surface 2a side of the apparatus main body 2 faces downward. It is formed in an arc shape. Therefore, after the rear end of the sheet has passed through the branch portion 62c, when the discharge roller pair 20 rotates in the reverse direction, the sheet is guided substantially parallel to the upper surface cover 51 by the surface of the reverse guide surface 62b on the branch portion 62c side. The reversing guide surface 62b is guided downward in an arc shape by the surface on the side surface 2a side, and is guided substantially parallel to the side surface 2a of the apparatus main body 2 by a conveyance guide (not shown). Further, the sheet is conveyed from the reverse conveyance path 16 to the registration roller pair 12 (see FIG. 1) in the sheet conveyance path 11. Since the surface on the branching portion 62c side is gently inclined downward, the paper that has passed through the branching portion 62c from the paper conveyance path 11 is smoothly guided to the reverse conveyance path 16 without returning to the paper conveyance path 11. The

上面カバー51は、反転ガイド部材62と、一部の排出ガイド部材61の上側に対向して配置され、また、排出ローラー対20の第2支軸20cを中心にして回動可能に支持される。上面カバー51の矢印B方向の回動動作によって、反転ガイド部材62と定着部14とが装置本体2から露出する。上面カバー51は、搬送ガイド部材52とカバー部材53とを有する。   The upper surface cover 51 is disposed so as to face the upper side of the reverse guide member 62 and a part of the discharge guide members 61, and is supported so as to be rotatable about the second support shaft 20c of the discharge roller pair 20. . The reversing guide member 62 and the fixing unit 14 are exposed from the apparatus main body 2 by the rotation operation of the upper surface cover 51 in the arrow B direction. The upper surface cover 51 includes a conveyance guide member 52 and a cover member 53.

搬送ガイド部材52は、反転ガイド部材62の反転ガイド面62b及び排出ガイド部材61の一部の搬送ガイド面61aに対向して設けられ、排出ガイド部材61の搬送ガイド面61aとともに定着処理された用紙を分岐部62cから排出ローラー対20に案内する一方、反転された用紙を反転ガイド面62bとともに反転搬送路16を水平方向に案内する。   The conveyance guide member 52 is provided to face the reverse guide surface 62 b of the reverse guide member 62 and a part of the conveyance guide surface 61 a of the discharge guide member 61, and is fixed together with the conveyance guide surface 61 a of the discharge guide member 61. Is guided from the branch portion 62c to the discharge roller pair 20, while the reversed paper is guided along the reverse guide surface 62b along the reverse conveyance path 16 in the horizontal direction.

カバー部材53は装置本体2の上面に対して外装面を形成する。定着部14の上部には、原稿読取装置6が配設されているが、カバー部材53と原稿読取装置6との間には空隙部2bが形成される。上面カバー51を第2支軸20c回りに回動させると、カバー部材53は、この空隙部2b内で開閉可能となる。   The cover member 53 forms an exterior surface with respect to the upper surface of the apparatus main body 2. The document reading device 6 is disposed above the fixing unit 14, but a gap 2 b is formed between the cover member 53 and the document reading device 6. When the upper surface cover 51 is rotated around the second support shaft 20c, the cover member 53 can be opened and closed within the gap 2b.

側面カバー55は、装置本体2の側面2aに対して外装面を形成し、外装面の反対側には、反転搬送路16を形成する搬送ガイド面55aを有する。搬送ガイド面55aは、反転ガイド部材62の反転ガイド面62bの円弧面に対向する面と装置本体2の側面2aに対して平行に延びる面とを有する。また、側面カバー55は、装置本体2の側面2aの下方において回動可能に支持され、回動動作によって装置本体2の側面2aを開閉可能とする。側面カバー55の開方向の回動動作によって、反転搬送路16が装置本体2から露出する。   The side cover 55 forms an exterior surface with respect to the side surface 2 a of the apparatus main body 2, and has a conveyance guide surface 55 a that forms the reverse conveyance path 16 on the opposite side of the exterior surface. The conveyance guide surface 55 a has a surface facing the arc surface of the reversing guide surface 62 b of the reversing guide member 62 and a surface extending in parallel to the side surface 2 a of the apparatus main body 2. Further, the side cover 55 is rotatably supported below the side surface 2a of the apparatus main body 2 so that the side surface 2a of the apparatus main body 2 can be opened and closed by a rotation operation. The reversal conveyance path 16 is exposed from the apparatus main body 2 by the rotation operation of the side cover 55 in the opening direction.

反転ガイド部材62は、図3に示すように揺動可能に支持される。図3は、反転ガイド部材62の構成を示す斜視図である。   The reversing guide member 62 is supported to be swingable as shown in FIG. FIG. 3 is a perspective view showing the configuration of the reversing guide member 62.

反転ガイド部材62は一対の第1軸受け62eを有する。一対の第1軸受け62eは、反転ガイド部材62の長手方向の両端部に設けられ、また、分岐部62c側(反転搬送路16の上流側)にて反転ガイド面62bから上側に突出して設けられる。第1軸受け62eは、下側を開放したU字状に形成され、装置本体2に設けた一対の第1支軸2dに夫々揺動可能に支持される。第1軸受け62eと第1支軸2dは、反転ガイド部材62の揺動中心となる第1回転軸を構成し、反転ガイド部材62は第1回転軸を中心にして揺動可能となる。尚、反転ガイド部材62に一対の支軸を設け、装置本体2に一対の軸受け孔を設け、第1回転軸は、反転ガイド部材62の支軸と装置本体2の軸受け孔とで構成するようにしてもよい。   The reverse guide member 62 has a pair of first bearings 62e. The pair of first bearings 62e are provided at both ends in the longitudinal direction of the reversing guide member 62, and are provided so as to protrude upward from the reversing guide surface 62b on the branching portion 62c side (upstream side of the reversing conveyance path 16). . The first bearings 62e are formed in a U shape with the lower side opened, and are supported by a pair of first support shafts 2d provided in the apparatus main body 2 so as to be swingable. The first bearing 62e and the first support shaft 2d constitute a first rotating shaft that is the center of swinging of the reversing guide member 62, and the reversing guide member 62 is swingable about the first rotating shaft. The reversing guide member 62 is provided with a pair of support shafts, the apparatus main body 2 is provided with a pair of bearing holes, and the first rotating shaft is composed of the support shaft of the reversing guide member 62 and the bearing holes of the device main body 2. It may be.

さらに、反転ガイド部材62は、第1係合部である一対の凹面62dを有する。一対の凹面62dは、反転ガイド部材62の長手方向の両端部に設けられる。また、凹面62dは、反転搬送路16の搬送路に対して第1軸受け62eから離間した位置(反転搬送路16の下流側の位置)にて反転ガイド面62bの下側に円弧状に窪んで形成される(尚、一対の凹面62dの他方の凹面62dは図3では不可視)。凹面62dは後述する上面カバー51のフック部52aと係合可能であり、上面カバー51が回動すると、凹面62dとフック部52aとの係合によって、反転ガイド部材62は第1回転軸を中心にして揺動することができる。   Further, the reversing guide member 62 has a pair of concave surfaces 62d which are first engaging portions. The pair of concave surfaces 62 d are provided at both ends of the reversing guide member 62 in the longitudinal direction. The concave surface 62d is recessed in an arc shape below the reversing guide surface 62b at a position away from the first bearing 62e with respect to the conveying path of the reversing conveying path 16 (a position on the downstream side of the reversing conveying path 16). (The other concave surface 62d of the pair of concave surfaces 62d is invisible in FIG. 3). The concave surface 62d can be engaged with a hook portion 52a of the upper surface cover 51, which will be described later. When the upper surface cover 51 rotates, the reversing guide member 62 is centered on the first rotation axis by the engagement of the concave surface 62d and the hook portion 52a. And can be swung.

図4〜図6は、第2係合部であるフック部52aを有する上面カバー51の詳しい構成を示す。図4は上面カバー51を下側から見た斜視図であり、図5は上面カバー51のカバー部材53を下側から見た斜視図であり、図6は上面カバー51の搬送ガイド部材52を下側から見た斜視図である。   4 to 6 show a detailed configuration of the top cover 51 having a hook portion 52a which is a second engagement portion. 4 is a perspective view of the top cover 51 as viewed from below, FIG. 5 is a perspective view of the cover member 53 of the top cover 51 as viewed from below, and FIG. 6 illustrates the transport guide member 52 of the top cover 51. It is the perspective view seen from the lower side.

図4に示すように、上面カバー51は、搬送ガイド部材52とカバー部材53とを有する。カバー部材53の内側面に搬送ガイド部材52が取り付けられ、搬送ガイド部材52は、排出ローラー対20の第2支軸20cに回動可能に支持されている。   As shown in FIG. 4, the upper surface cover 51 includes a conveyance guide member 52 and a cover member 53. A conveyance guide member 52 is attached to the inner surface of the cover member 53, and the conveyance guide member 52 is rotatably supported by the second support shaft 20 c of the discharge roller pair 20.

図5に示すように、カバー部材53は、外観の仕上げが良好である樹脂にて、外縁に立ち上り部を備えて矩形状に形成される。カバー部材53は、外装面に対して反対側の内側面53bに複数の嵌め込み突起53aが形成される。複数の嵌め込み突起53aは、搬送ガイド部材52をカバー部材53に取り付けるためのものであり、幅方向の外側を鉤型にして互いに対向して長手方向に並べて配置され、幅方向に弾性変形可能である。   As shown in FIG. 5, the cover member 53 is made of a resin having a good appearance finish and is formed in a rectangular shape with a rising portion at the outer edge. The cover member 53 has a plurality of fitting protrusions 53a formed on the inner side surface 53b opposite to the exterior surface. The plurality of fitting protrusions 53a are for attaching the conveyance guide member 52 to the cover member 53, and are arranged side by side in the longitudinal direction so as to face each other with the outer side in the width direction as a bowl shape, and can be elastically deformed in the width direction. is there.

図6に示すように、搬送ガイド部材52は、耐熱性を有する樹脂にて、カバー部材53の内側面53b(図5参照)に収まるように矩形状に形成される。上面カバー51は、定着部14に近傍に配設されるために、定着部14の熱に起因して上面カバー51の外装面が熱変形する可能性がある。しかし、上面カバー51をカバー部材53と搬送ガイド部材52とに分離して、カバー部材53と定着部14との間に耐熱性を有する樹脂からなる搬送ガイド部材52を介在させることで、カバー部材53が定着部14の熱の影響を直接受けなくなり、上面カバー51は外観性能を損なうことがない。   As shown in FIG. 6, the transport guide member 52 is made of a heat-resistant resin and is formed in a rectangular shape so as to fit on the inner side surface 53 b (see FIG. 5) of the cover member 53. Since the upper surface cover 51 is disposed in the vicinity of the fixing unit 14, the exterior surface of the upper surface cover 51 may be thermally deformed due to the heat of the fixing unit 14. However, the upper surface cover 51 is separated into the cover member 53 and the conveyance guide member 52, and the conveyance guide member 52 made of a resin having heat resistance is interposed between the cover member 53 and the fixing unit 14, thereby the cover member. 53 is not directly affected by the heat of the fixing unit 14, and the top cover 51 does not impair the appearance performance.

また、搬送ガイド部材52は、上面係合部であるフック部52aと、カバー部材53の嵌め込み突起53aに係合する嵌め込み孔52bと、第2軸受け52cと、搬送ガイド面52dと、を有する。   The conveyance guide member 52 includes a hook portion 52a that is an upper surface engagement portion, a fitting hole 52b that engages with the fitting protrusion 53a of the cover member 53, a second bearing 52c, and a conveyance guide surface 52d.

嵌め込み孔52bは、カバー部材53の一対の嵌め込み突起53aに係合可能であるように長手方向に複数個形成される。搬送ガイド部材52をカバー部材53の内側面53bに対面させてカバー部材53に収めると、カバー部材53の嵌め込み突起53aが弾性変形して搬送ガイド部材52の嵌め込み孔52bに係合し、搬送ガイド部材52はカバー部材53に取り付けられる。   A plurality of fitting holes 52b are formed in the longitudinal direction so as to be engageable with the pair of fitting projections 53a of the cover member 53. When the conveyance guide member 52 faces the inner side surface 53b of the cover member 53 and is accommodated in the cover member 53, the fitting protrusion 53a of the cover member 53 is elastically deformed and engages with the fitting hole 52b of the conveyance guide member 52, thereby conveying the conveyance guide. The member 52 is attached to the cover member 53.

搬送ガイド面52dは、フィン形状のリブが長手方向に複数個並べて形成され、排出ガイド部材61の搬送ガイド面61a(図2参照)、及び反転ガイド部材62の反転ガイド面62b(図2参照)に対向して配置される。搬送ガイド面52dが排出ガイド部材61の搬送ガイド面61aに対向配置されることで、定着処理された用紙を案内し、また、搬送ガイド面52dが反転ガイド面62bに対向配置されることで、反転された用紙を案内する。   The conveyance guide surface 52d is formed by arranging a plurality of fin-shaped ribs in the longitudinal direction, the conveyance guide surface 61a of the discharge guide member 61 (see FIG. 2), and the reverse guide surface 62b of the reverse guide member 62 (see FIG. 2). It is arrange | positioned facing. The conveyance guide surface 52d is disposed opposite to the conveyance guide surface 61a of the discharge guide member 61 to guide the fixed sheet, and the conveyance guide surface 52d is disposed opposite to the reverse guide surface 62b. Guide the reversed paper.

第2軸受け52cは、搬送ガイド部材52の長手方向の両端部に一対設けられ、また、反転搬送路16の上流側に設けられる。第2軸受け52cは、下側を開放したU字状に形成され、排出ローラー対20の第2支軸20c(図4参照)に夫々回転可能に支持される。第2軸受け52cと第2支軸20cは、搬送ガイド部材52(上面カバー51)の回動中心となる第2回転軸を構成し、上面カバー51は第2回転軸を中心に回動可能となる。   A pair of second bearings 52 c are provided at both ends in the longitudinal direction of the conveyance guide member 52, and are provided upstream of the reverse conveyance path 16. The second bearings 52c are formed in a U shape with the lower side opened, and are rotatably supported by the second support shafts 20c (see FIG. 4) of the discharge roller pair 20, respectively. The second bearing 52c and the second support shaft 20c constitute a second rotation shaft that is the rotation center of the transport guide member 52 (upper surface cover 51), and the upper surface cover 51 is rotatable about the second rotation shaft. Become.

フック部52aは、搬送ガイド部材52の長手方向の両端部に一対設けられ、また、反転搬送路16の下流側に設けられる。フック部52aは、長手方向の内側を鉤型に形成され、反転ガイド部材62(図3参照)の凹面62dに係合可能である。具体的にはフック部52aの鉤型部の上面が反転ガイド部材62の凹面62dに当接可能である。搬送ガイド部材52(上面カバー51)が回動すると、フック部52aと凹面62dとの係合によって、反転ガイド部材62は、搬送ガイド部材52の回動に連動して揺動する。   A pair of hook portions 52 a are provided at both ends of the conveyance guide member 52 in the longitudinal direction, and are provided on the downstream side of the reverse conveyance path 16. The hook portion 52a is formed in a hook shape on the inner side in the longitudinal direction, and can be engaged with the concave surface 62d of the reversing guide member 62 (see FIG. 3). Specifically, the upper surface of the hook portion of the hook portion 52 a can contact the concave surface 62 d of the reversing guide member 62. When the transport guide member 52 (upper surface cover 51) rotates, the reverse guide member 62 swings in conjunction with the rotation of the transport guide member 52 due to the engagement between the hook portion 52a and the concave surface 62d.

図7は、上面カバー51の回動動作にともない反転ガイド部材62を揺動させる駆動機構を模式的に示す図である。   FIG. 7 is a diagram schematically showing a drive mechanism that swings the reversing guide member 62 in accordance with the turning operation of the upper surface cover 51.

駆動機構70は、第1支軸2dと第1軸受け62eからなる第1回転軸71と、第2支軸20cと第2軸受け52cからなる第2回転軸72と、反転ガイド部材62に形成された凹面62d(第1係合部)と、上面カバー51に設けられたフック部52a(第2係合部)と、を有する。   The drive mechanism 70 is formed on a first rotating shaft 71 composed of a first support shaft 2d and a first bearing 62e, a second rotating shaft 72 composed of a second support shaft 20c and a second bearing 52c, and a reversing guide member 62. 62 d (first engagement portion) and a hook portion 52 a (second engagement portion) provided on the upper surface cover 51.

第1回転軸71は反転ガイド部材62の揺動中心を構成し、第2回転軸72は上面カバー51の回動中心を構成する。   The first rotation shaft 71 constitutes the swing center of the reversing guide member 62, and the second rotation shaft 72 constitutes the rotation center of the upper surface cover 51.

上面カバー51のフック部52aは、その上面にて反転ガイド部材62の凹面62dに係合している。上面カバー51が矢印B方向(上面カバー51の開方向)に回動すると、フック部52aが第2回転軸72の回りで矢印B方向に回動する。フック部52aの回動によって、フック部52aに当接する凹面62dが持ち上げられ、反転ガイド部材62は第1回転軸71の回りで矢印B方向に揺動する。   The hook portion 52 a of the upper surface cover 51 is engaged with the concave surface 62 d of the reversing guide member 62 on its upper surface. When the upper surface cover 51 rotates in the direction of arrow B (the opening direction of the upper surface cover 51), the hook portion 52a rotates in the direction of arrow B around the second rotation shaft 72. Due to the rotation of the hook portion 52 a, the concave surface 62 d that comes into contact with the hook portion 52 a is lifted, and the reverse guide member 62 swings around the first rotation shaft 71 in the arrow B direction.

ここで、第1回転軸71から凹面62dまでの距離を第1の距離X1とし、また、第2回転軸72からフック部52aまでの距離を第2の距離X2とする。第1の距離X1は第2の距離X2より小さく構成されている。この構成よれば、第1回転軸71は、第2回転軸72に対して反転搬送路16の下流側に配置されていることになる。尚、第1の距離X1は、フック部52aに当接する凹面62dの位置と第1回転軸71との距離である。   Here, a distance from the first rotation shaft 71 to the concave surface 62d is a first distance X1, and a distance from the second rotation shaft 72 to the hook portion 52a is a second distance X2. The first distance X1 is configured to be smaller than the second distance X2. According to this configuration, the first rotation shaft 71 is disposed on the downstream side of the reverse conveyance path 16 with respect to the second rotation shaft 72. The first distance X1 is the distance between the position of the concave surface 62d that contacts the hook portion 52a and the first rotation shaft 71.

上記実施形態によれば、上面カバー51を矢印B方向に所定の角度だけ回動させて、上面カバー51を開くと、上面カバー51の開方向への回動動作に連動して、反転ガイド部材62が矢印B方向に所定の角度よりも大きく揺動する。従って、反転ガイド部材62に覆われた定着部14(図2参照)が、反転ガイド部材62から広く露出することになり、定着部14のジャム処理が行い易くなる。また、本実施形態のように、定着部14の上側に原稿読取装置6等の別部材が配設され、上面カバー51と原稿読取装置6との空隙が小さくて、上面カバー51を大きく回動させて開くことができない場合にも適用することができる。この場合には画像形成装置が小型になる。   According to the embodiment, when the upper surface cover 51 is rotated by a predetermined angle in the direction of arrow B and the upper surface cover 51 is opened, the reversing guide member is interlocked with the rotation operation of the upper surface cover 51 in the opening direction. 62 swings in the direction of arrow B to be larger than a predetermined angle. Therefore, the fixing unit 14 (see FIG. 2) covered with the reversing guide member 62 is widely exposed from the reversing guide member 62, and it becomes easy to perform jam processing of the fixing unit 14. Further, as in the present embodiment, another member such as the document reading device 6 is disposed on the upper side of the fixing unit 14, the gap between the top cover 51 and the document reading device 6 is small, and the top cover 51 is rotated largely. It can also be applied when it cannot be opened. In this case, the image forming apparatus becomes small.

尚、上記実施形態では、第1の距離X1を第2の距離X2より小さく構成したが、上面カバー51を大きい角度で開けることが可能である等、定着部14の周辺の部材の配置、構成により、適宜、第1の距離X1が第2の距離X2に対して同等以上であるように構成してもよい。   In the above embodiment, the first distance X1 is configured to be smaller than the second distance X2, but the arrangement and configuration of the members around the fixing unit 14 such that the upper surface cover 51 can be opened at a large angle. Accordingly, the first distance X1 may be appropriately equal to or greater than the second distance X2.

図8は、上面カバー51を開いた状態の定着部14の周辺を示す平面図である。定着ローラー14aと加圧ローラー14bとの間に用紙が詰まり、用紙を定着部14から取り除く場合、まず、側面カバー55を装置本体2に対して開く。側面カバー55を開くと、反転ガイド部材62が装置本体2から露出する。次に、上面カバー51を装置本体2に対して開く。上面カバー51を開く、即ち、上面カバー51が第2支軸20cを中心に回動すると、上面カバー51の回動動作に連動して、反転ガイド部材62が上面カバー51と同じ方向に第1支軸2dを中心に揺動する。反転ガイド部材62の揺動によって、定着部14が反転ガイド部材62から露出する。この状態で、定着部14に詰まった用紙を簡単に取り除くことができる。   FIG. 8 is a plan view showing the periphery of the fixing unit 14 with the top cover 51 opened. When the paper is jammed between the fixing roller 14 a and the pressure roller 14 b and the paper is removed from the fixing unit 14, first, the side cover 55 is opened with respect to the apparatus main body 2. When the side cover 55 is opened, the reverse guide member 62 is exposed from the apparatus main body 2. Next, the top cover 51 is opened with respect to the apparatus main body 2. When the upper surface cover 51 is opened, that is, when the upper surface cover 51 rotates about the second support shaft 20 c, the reversing guide member 62 moves in the same direction as the upper surface cover 51 in conjunction with the rotation operation of the upper surface cover 51. It swings around the support shaft 2d. The fixing unit 14 is exposed from the reverse guide member 62 by the swinging of the reverse guide member 62. In this state, the paper jammed in the fixing unit 14 can be easily removed.

また、上記実施形態によれば、上面カバー51の開方向への回動動作によって、上面カバー51は、側面カバー55側が開放されるように構成されるとともに、反転ガイド部材62は、定着部14が側面カバー55側に向けて装置本体2から露出するように構成される。側面カバー55の開閉及び上面カバー51の開閉の操作と、定着部14からの用紙の除去が常に側面カバー55から行われるために、ジャム処理を行い易い。   Further, according to the above-described embodiment, the upper surface cover 51 is configured so that the side surface cover 55 side is opened by the rotation operation of the upper surface cover 51 in the opening direction, and the reverse guide member 62 is configured so that the fixing unit 14 is open. Is exposed from the apparatus main body 2 toward the side cover 55 side. Since the operation of opening and closing the side cover 55 and the opening and closing of the top cover 51 and the removal of the sheet from the fixing unit 14 are always performed from the side cover 55, it is easy to perform jam processing.

また、上記実施形態によれば、駆動機構70は、第1回転軸71と、第2回転軸72と、反転ガイド部材62に形成された凹面62dと、上面カバー51に設けられたフック部52aと有する簡単な構成からなるが、上面カバー51の回動動作に連動して、反転ガイド部材62に覆われた定着部14を露出させることがきる。   Further, according to the embodiment, the driving mechanism 70 includes the first rotating shaft 71, the second rotating shaft 72, the concave surface 62 d formed on the reverse guide member 62, and the hook portion 52 a provided on the upper surface cover 51. The fixing unit 14 covered with the reversing guide member 62 can be exposed in conjunction with the turning operation of the upper surface cover 51.

尚、上記実施形態では、側面カバー55の搬送ガイド面55aが反転ガイド部材62の反転ガイド面62bとともに反転搬送路16を形成する構成を示したが、本発明はこれに限らず、側面カバー55の搬送ガイド面55aの替わりに、搬送ガイド部材52の搬送ガイド面52dが反転搬送路16の下流側にさらに延設するようにして、延設した搬送ガイド面52dが反転ガイド部材62の反転ガイド面62bに対向するように構成してもよい。この構成において、定着部14のジャム処理を行う場合、側面カバー55を開けることなく、上面カバー51を開けるだけで、上面カバー51の回動動作に連動して、反転ガイド部材62に覆われた定着部14を露出させることがきる。   In the embodiment described above, the conveyance guide surface 55a of the side cover 55 forms the reverse conveyance path 16 together with the reverse guide surface 62b of the reverse guide member 62. However, the present invention is not limited thereto, and the side cover 55 is not limited thereto. Instead of the transport guide surface 55 a, the transport guide surface 52 d of the transport guide member 52 extends further to the downstream side of the reverse transport path 16, and the extended transport guide surface 52 d is the reverse guide of the reverse guide member 62. You may comprise so that the surface 62b may be opposed. In this configuration, when the jam processing of the fixing unit 14 is performed, the top cover 51 is simply opened without the side cover 55 being opened, and the reversing guide member 62 is covered in conjunction with the rotation of the top cover 51. The fixing unit 14 can be exposed.

また、上記実施形態では、定着部14の上側に原稿読取装置6が配設される画像形成装置100に適用した例を示したが、本発明はこれに限らず、定着部14の上側には、原稿読取装置6が配設されておらずに上面カバー51が配設されるプリンター等の画像形成装置に適用してもよい。   In the above-described embodiment, an example is shown in which the present invention is applied to the image forming apparatus 100 in which the document reading device 6 is disposed on the upper side of the fixing unit 14. Further, the present invention may be applied to an image forming apparatus such as a printer in which the upper surface cover 51 is disposed without the document reading device 6 being disposed.

また、上記実施形態では、上面カバー51はカバー部材53と搬送ガイド部材52とで構成する例を示したが、本発明はこれに限らず、上面カバー51を一つの部材にて構成してもよい。   In the above embodiment, the upper surface cover 51 is configured by the cover member 53 and the conveyance guide member 52. However, the present invention is not limited thereto, and the upper surface cover 51 may be configured by one member. Good.

また、上記実施形態では、上面カバー51にフック部52aを設け、反転ガイド部材62に凹面62dを形成する構成を示したが、本発明はこれに限らず、上面カバー51には凹面を設けて、反転ガイド部材62には凸部を形成し、反転ガイド部材62の凸部の下側が上面カバー51の凹面に当接する構成であってもよい。この場合、上面カバー51の回動動作によって、上面カバー51の凹面が反転ガイド部材62の凸部を持ち上げ、反転ガイド部材62が揺動することになり、上記実施形態と同様の効果を奏する。   In the above-described embodiment, the hook portion 52a is provided on the upper surface cover 51 and the concave surface 62d is formed on the reversing guide member 62. However, the present invention is not limited to this, and the upper surface cover 51 is provided with a concave surface. The reverse guide member 62 may have a convex portion, and the lower side of the convex portion of the reverse guide member 62 may be in contact with the concave surface of the upper surface cover 51. In this case, the turning operation of the upper surface cover 51 causes the concave surface of the upper surface cover 51 to lift the convex portion of the reversing guide member 62, and the reversing guide member 62 swings. Thus, the same effect as in the above embodiment can be obtained.

本発明は、複写機、プリンター、ファクシミリ、それらの複合機等の画像形成装置に利用することができ、特に、装置上方に位置する定着部のジャム処理機構を有する画像形成装置に利用することができる。   The present invention can be used for an image forming apparatus such as a copying machine, a printer, a facsimile machine, or a multifunction machine thereof. In particular, the present invention can be used for an image forming apparatus having a jamming mechanism of a fixing unit located above the apparatus. it can.

2 装置本体
2a 側面
2b 空隙部
2d 第1支軸(第1回転軸)
3 画像形成部
5 感光体(像担持体)
11 用紙搬送路
14 定着部
14a 定着ローラー
14b 加圧ローラー
16 反転搬送路
17 胴内排紙部(排出部)
20 排出ローラー対
20a 排出ローラー
20b コロ
20c 第2支軸(第2回転軸)
51 上面カバー
52 搬送ガイド部材
52a フック部(第2係合部)
52b 嵌め込み孔
52c 第2軸受け(第2回転軸)
52d 搬送ガイド面
53 カバー部材
53a 嵌め込み突起
53b 内側面
55 側面カバー
55a 搬送ガイド面
61 排出ガイド部材
61a 搬送ガイド面
62 反転ガイド部材
62a 搬送ガイド面
62b 反転ガイド面
62c 分岐部
62d 凹面(第1係合部)
62e 第1軸受け(第1回転軸)
70 駆動機構
71 第1回転軸
72 第2回転軸
100 画像形成装置
2 apparatus main body 2a side surface 2b gap 2d first support shaft (first rotation shaft)
3 Image forming unit 5 Photoconductor (image carrier)
DESCRIPTION OF SYMBOLS 11 Paper conveyance path 14 Fixing part 14a Fixing roller 14b Pressure roller 16 Reverse conveyance path 17 In-body discharge part (discharge part)
20 discharge roller pair 20a discharge roller 20b roller 20c second support shaft (second rotation shaft)
51 Upper surface cover 52 Conveying guide member 52a Hook part (second engaging part)
52b Fitting hole 52c Second bearing (second rotating shaft)
52d conveyance guide surface 53 cover member 53a fitting projection 53b inner surface 55 side cover 55a conveyance guide surface 61 discharge guide member 61a conveyance guide surface 62 reverse guide member 62a conveyance guide surface 62b reverse guide surface 62c branching portion 62d concave surface (first engagement) Part)
62e 1st bearing (1st rotating shaft)
70 Drive Mechanism 71 First Rotating Shaft 72 Second Rotating Shaft 100 Image Forming Apparatus

Claims (5)

像担持体上に形成されたトナー像を記録媒体上に転写する画像形成部と、
該画像形成部において記録媒体上に転写されたトナー像を記録媒体上に溶融定着する定着部と、
該定着部によりトナー像が定着された記録媒体を排出する排出部と、
記録媒体を前記画像形成部から前記排出部へと搬送するための用紙搬送路と、
装置本体の上面及び側面に沿って延設され、一方の面に画像形成がなされた記録媒体を反転させて前記画像形成部へと再搬送するための反転搬送路と、
装置本体の上側にて前記定着部を覆うように揺動可能に配置され、搬送ガイド面にて前記用紙搬送路の一部を形成する一方、前記搬送ガイド面の反対側に向き合う反転ガイド面にて前記反転搬送路の一部を形成する反転ガイド部材と、
装置本体の上面に対して回動可能に支持され、回動動作によって装置本体の上面を開閉可能とする上面カバーと、
該上面カバーの開閉動作に連動して、前記反転ガイド部材を、前記定着部を露出させる位置と、前記定着部を覆う位置とに揺動させる駆動機構と、
を備え
前記駆動機構は、
前記反転ガイド部材の揺動中心を構成する第1回転軸と、
該第1回転軸から第1の距離だけ離間して前記反転ガイド部材に設けられた第1係合部と、
前記上面カバーの回動中心を構成する第2回転軸と、
該第2回転軸から第2の距離だけ離間して前記上面カバーに設けられ前記第1係合部に係合可能である第2係合部と、
を備え、
前記上面カバーの開方向への回動動作に連動して、前記第2係合部が前記第2回転軸を中心として回動することによって、前記第1係合部が持ち上げられ、前記反転ガイド部材が前記第1回転軸を中心として揺動することを特徴とする画像形成装置。
An image forming unit for transferring a toner image formed on the image carrier onto a recording medium;
A fixing unit that melts and fixes the toner image transferred onto the recording medium in the image forming unit;
A discharge unit for discharging the recording medium on which the toner image is fixed by the fixing unit;
A paper transport path for transporting a recording medium from the image forming section to the discharge section;
A reversing conveyance path for reversing a recording medium that is extended along the upper surface and side surface of the apparatus main body and on which the image is formed on one surface, and reconveyed to the image forming unit;
A reversing guide surface is disposed on the upper side of the apparatus body so as to be able to swing so as to cover the fixing unit, and forms a part of the sheet transport path on the transport guide surface, while facing the opposite side of the transport guide surface. A reversing guide member that forms part of the reversing conveyance path;
An upper surface cover that is rotatably supported with respect to the upper surface of the apparatus main body, and that can open and close the upper surface of the apparatus main body by a rotating operation;
In conjunction with the opening and closing operation of the upper surface cover, a driving mechanism that swings the reversing guide member to a position where the fixing portion is exposed and a position where the fixing portion is covered,
Equipped with a,
The drive mechanism is
A first rotation shaft that constitutes a swing center of the reversing guide member;
A first engagement portion provided on the reversing guide member at a first distance from the first rotation shaft;
A second rotation shaft constituting a rotation center of the upper surface cover;
A second engagement portion provided on the upper surface cover and spaced from the second rotation shaft by a second distance, and engageable with the first engagement portion;
With
In conjunction with the pivoting operation of the upper surface cover in the opening direction, the second engagement portion pivots about the second rotation axis, whereby the first engagement portion is lifted, and the reversing guide An image forming apparatus, wherein the member swings about the first rotation axis .
前記第1係合部は下面が係合面となる凹面状に形成され、前記第2係合部は前記第1係合部の係合面に当接可能である上面を有するフック形状に形成されることを特徴とする請求項に記載の画像形成装置。 The first engaging portion is formed in a concave shape having a lower surface as an engaging surface, and the second engaging portion is formed in a hook shape having an upper surface capable of contacting the engaging surface of the first engaging portion. The image forming apparatus according to claim 1 , wherein the image forming apparatus is an image forming apparatus. 前記第1の距離は前記第2の距離より小さく構成されることを特徴とする請求項又は請求項に記載の画像形成装置。 The first distance image forming apparatus according to claim 1 or claim 2, characterized in that it is configured to be smaller than the second distance. 装置本体の側面に対して回動可能に支持され、回動動作によって装置本体の側面を開閉可能とし、開方向の回動によって前記反転搬送路を装置本体から露出させる側面カバーをさらに備え、
前記上面カバーの開方向への回動動作によって、前記上面カバーは、前記側面カバー側が開放されるように構成されるとともに、前記反転ガイド部材は、前記定着部が前記側面カバー側に向けて装置本体から露出するように構成されることを特徴とする請求項1〜請求項のいずれかに記載の画像形成装置。
A side cover that is supported rotatably with respect to the side surface of the apparatus main body, that allows the side surface of the apparatus main body to be opened and closed by a rotation operation, and that exposes the reverse conveyance path from the apparatus main body by rotation in an opening direction;
The top cover is configured such that the side cover side is opened by the pivoting operation of the top cover in the opening direction, and the reversing guide member is configured such that the fixing unit faces the side cover side. the image forming apparatus according to any one of claims 1 to 3, characterized in that it is configured so as to be exposed from the body.
前記上面カバーは、装置本体の上面を形成するカバー部材と、前記反転ガイド面に対向して配置される搬送ガイド部材とを有することを特徴とする請求項1〜請求項のいずれかに記載の画像形成装置。 The top cover is, according to any one of claims 1 to 4, characterized in that it comprises a cover member which forms a top surface of the apparatus body and a conveyance guide member arranged opposite to the reversing guide surface Image forming apparatus.
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