JP2015011291A - Sound absorption structure - Google Patents

Sound absorption structure Download PDF

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JP2015011291A
JP2015011291A JP2013138517A JP2013138517A JP2015011291A JP 2015011291 A JP2015011291 A JP 2015011291A JP 2013138517 A JP2013138517 A JP 2013138517A JP 2013138517 A JP2013138517 A JP 2013138517A JP 2015011291 A JP2015011291 A JP 2015011291A
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sound absorbing
sound
absorbing structure
absorbing material
post
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JP6205906B2 (en
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尚浩 韓
Hisahiro Kan
尚浩 韓
有珠 李
Youju Lee
有珠 李
龍一 佐藤
Ryuichi Sato
龍一 佐藤
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a sound absorption structure excellent in quietness and capable of reducing component number and assembly man-hour.SOLUTION: The sound absorption structure comprises: an inside member; an inside covering member attached to the inside member in a state of covering inside of the inside member; and a sound insulation member having facing surfaces to the inside member and the inside covering member. The sound insulation member has a penetration hole penetrating from one surface side to the other surface side in a thickness direction. A projection part disposed on the inside member or the inside covering member is inserted into the penetration hole from the one surface side of the sound insulation member, and fixed from the other surface side of the sound insulation member with a fix member.

Description

本発明は、吸音構造に関する。   The present invention relates to a sound absorbing structure.

筐体の内部に着脱自在に装着される着脱部品と、装着口が形成されている内側覆い部材と、外側覆い部材と、内側覆い部材と外側覆い部材との間に配置され、当該内側覆い部材の少なくとも装着口を露出させた状態及び覆って遮音する状態にするよう開閉操作される遮音部材とを有し、遮音部材の少なくとも前記内側覆い部材の装着口と対向する部分に複数の貫通孔を一定の配置パターンで形成する一方で、遮音部材と外側覆い部材とを互いに閉じた状態にしたときに貫通孔が形成された遮音部材の部分と当該外側覆い部材とが間隔をあけて対向する状態になるよう配置して両者の間に空気層を形成し、貫通孔が形成された遮音部材の部分と空気層とによる吸音構造を構成した画像形成装置が知られている（特許文献１）。   A detachable component that is detachably mounted inside the housing, an inner cover member in which a mounting opening is formed, an outer cover member, and the inner cover member are disposed between the inner cover member and the outer cover member. A sound insulating member that is opened and closed so that at least the mounting opening is exposed and is covered and sound-insulated, and a plurality of through holes are formed in a portion of the sound insulating member that faces the mounting opening of the inner covering member. A state in which the sound insulation member and the outer cover member are opposed to each other with a space therebetween when the sound insulation member and the outer cover member are closed with each other while the sound insulation member and the outer cover member are closed. There is known an image forming apparatus in which an air layer is formed between the two and a sound absorbing structure is formed by a portion of a sound insulating member in which a through hole is formed and an air layer (Patent Document 1).

記録媒体上に画像を形成する画像形成部と、画像形成部を内包し、該画像形成部に記録媒体を供給する開口が設けられた筐体と、筐体の開口を塞いだ閉状態と該開口を開放した開状態との間で開閉自在な、該開状態で前記記録媒体が置かれる記録媒体置台と、音の伝達を阻害する構造を有した、記録媒体置台の少なくとも一部を構成した、該記録媒体置台が閉状態にある時に開口と筐体の外部との間を遮る遮音板とを備えた画像形成装置も知られている（特許文献２）。   An image forming unit that forms an image on a recording medium, a housing that includes the image forming unit and that has an opening for supplying the recording medium to the image forming unit, a closed state in which the opening of the housing is closed, and the At least a part of the recording medium mounting base that has a structure that inhibits sound transmission and a recording medium mounting base on which the recording medium is placed in the open state that is openable and closable between an open state and an open state. Also known is an image forming apparatus provided with a sound insulating plate that shields between the opening and the outside of the housing when the recording medium mounting base is in a closed state (Patent Document 2).

特開２０１０−２１７６６４号公報JP 2010-217664 A 特開２００９−４０５５５号公報JP 2009-40555 A

本発明は、静音性に優れるとともに部品点数や組立工数が削減された吸音構造を提供することを目的とする。   It is an object of the present invention to provide a sound absorbing structure that is excellent in quietness and has a reduced number of parts and assembly man-hours.

前記課題を解決するために、請求項１に記載の吸音構造は、
内側部材と、
前記内側部材にその内部を覆う状態で取り付けられる内側覆い部材と、
前記内側部材及び前記内側覆い部材への対峙面を有して配置された遮音部材と、を有し、
前記遮音部材が、厚み方向において一面側から他面側にまで貫通する貫通孔を有し前記内側部材又は前記内側覆い部材に設けられた突起部が前記遮音部材の一面側から前記貫通孔に挿入され、前記遮音部材の他面側から固定部材で固定された、
ことを特徴とする。 In order to solve the problem, the sound absorbing structure according to claim 1 is:
An inner member;
An inner covering member attached to the inner member in a state of covering the inside;
A sound insulating member disposed with a facing surface to the inner member and the inner covering member, and
The sound insulation member has a through hole penetrating from one surface side to the other surface side in the thickness direction, and a protrusion provided on the inner member or the inner cover member is inserted into the through hole from one surface side of the sound insulation member. And fixed by a fixing member from the other surface side of the sound insulating member,
It is characterized by that.

請求項２記載の発明は、請求項１に記載の吸音構造において、
前記固定部材が、前記遮音部材の前記貫通孔が挿入される筒部と、前記筒部の筒軸心方向に設けられたフランジ状鍔部とを有し、
前記遮音部材の一面に前記フランジ状鍔部が面接触し前記内側部材又は前記内側覆い部材に設けられた前記突起部に締結部材を用いて締結されている、
ことを特徴とする。 The invention according to claim 2 is the sound absorbing structure according to claim 1,
The fixing member has a cylindrical portion into which the through hole of the sound insulating member is inserted, and a flange-like flange portion provided in a cylindrical axis direction of the cylindrical portion,
The flange-shaped flange portion is in surface contact with one surface of the sound insulating member and is fastened using a fastening member to the protrusion provided on the inner member or the inner covering member.
It is characterized by that.

請求項３記載の発明は、請求項１又は２に記載の吸音構造において、
前記締結部材がネジ又はスナップフィット部材である、
ことを特徴とする。 The invention according to claim 3 is the sound absorbing structure according to claim 1 or 2,
The fastening member is a screw or a snap fit member;
It is characterized by that.

請求項４記載の発明は、請求項１ないし３のいずれか１項に記載の吸音構造において、
前記遮音部材が複数のシート材からなる、
ことを特徴とする。 According to a fourth aspect of the present invention, in the sound absorbing structure according to any one of the first to third aspects,
The sound insulation member is composed of a plurality of sheet materials,
It is characterized by that.

請求項５記載の発明は、請求項１ないし４のいずれか１項に記載の吸音構造において、
前記遮音部材が、軟質フォーム材又は多孔質の弾性変形可能材である、
ことを特徴とする。 The invention according to claim 5 is the sound absorbing structure according to any one of claims 1 to 4,
The sound insulation member is a flexible foam material or a porous elastically deformable material,
It is characterized by that.

請求項６記載の発明は、請求項１ないし５のいずれか１項に記載の吸音構造において、
前記内側覆い部材の前記遮音部材と接触する側に補強用リブが設けられている、
ことを特徴とする。 The invention according to claim 6 is the sound absorbing structure according to any one of claims 1 to 5,
Reinforcing ribs are provided on the side of the inner covering member that contacts the sound insulation member.
It is characterized by that.

請求項１、２、３に記載の発明によれば、静音性に優れるとともに部品点数や組立工数が削減された吸音構造を提供することができる。
請求項４、５に記載の発明によれば、難燃性を確保しつつ静音性の高い吸音構造を提供することができる。
請求項６に記載の発明によれば、内側覆い部材の強度を確保しつつ静音性の高い吸音構造を提供することができる。 According to the first, second, and third aspects of the invention, it is possible to provide a sound absorbing structure that is excellent in noise reduction and has a reduced number of parts and assembly steps.
According to the fourth and fifth aspects of the invention, it is possible to provide a sound-absorbing structure with high silence while ensuring flame retardancy.
According to the sixth aspect of the present invention, it is possible to provide a sound absorbing structure with high silence while ensuring the strength of the inner covering member.

画像形成システム１の外観全体を示す概略構成図である。1 is a schematic configuration diagram showing an overall appearance of an image forming system 1. FIG. 画像形成システム１の内部構成を示す断面模式図である。1 is a schematic cross-sectional view showing an internal configuration of an image forming system 1. FIG. 後処理装置２００の外観を示す斜視図である。2 is a perspective view showing an external appearance of a post-processing apparatus 200. FIG. 搬送装置１００における吸音構造を示す断面模式図である。FIG. 3 is a schematic cross-sectional view showing a sound absorbing structure in the transport apparatus 100. （ａ）は搬送装置１００の上側外装カバー１４１を取り外した内部構成斜視図、（ｂ）は下側吸音材１５５側に視点をおいた内部構成斜視図である。(A) is the internal structure perspective view which removed the upper exterior cover 141 of the conveying apparatus 100, (b) is the internal structure perspective view which looked at the lower side sound-absorbing material 155 side. 後処理装置２００における吸音構造を示す断面模式図である。4 is a schematic cross-sectional view showing a sound absorbing structure in the post-processing apparatus 200. FIG. 図７は後処理装置２００の前後外装カバー２３１の内面側を示す斜視図である。FIG. 7 is a perspective view showing the inner surface side of the front and rear exterior cover 231 of the post-processing apparatus 200. 後処理装置２００の左右外装カバー２３２の内面側を示す斜視図である。4 is a perspective view showing the inner surface side of the left and right exterior covers 232 of the post-processing apparatus 200. 比較例の吸音構造の断面模式図である。It is a cross-sectional schematic diagram of the sound absorption structure of a comparative example.

次に図面を参照しながら、以下に実施形態及び具体例を挙げ、本発明を更に詳細に説明するが、本発明はこれらの実施形態及び具体例に限定されるものではない。
また、以下の図面を使用した説明において、図面は模式的なものであり、各寸法の比率等は現実のものとは異なることに留意すべきであり、理解の容易のために説明に必要な部材以外の図示は適宜省略されている。
尚、以後の説明の理解を容易にするために、図面において、前後方向をＸ軸方向、左右方向をＹ軸方向、上下方向をＺ軸方向とする。 Next, the present invention will be described in more detail with reference to the drawings with reference to embodiments and specific examples. However, the present invention is not limited to these embodiments and specific examples.
Also, in the description using the following drawings, it should be noted that the drawings are schematic and the ratio of each dimension and the like are different from the actual ones, and are necessary for the description for easy understanding. Illustrations other than the members are omitted as appropriate.
In order to facilitate understanding of the following description, in the drawings, the front-rear direction is the X-axis direction, the left-right direction is the Y-axis direction, and the up-down direction is the Z-axis direction.

（１）画像形成システムの全体構成及び動作
図１は本実施形態に係る吸音構造が適用される画像形成システム１の外観全体を示す概略構成図、図２は画像形成システム１の内部構成を示す断面模式図、図３は後処理装置２００の外観を示す斜視図である。以下、図面を参照しながら、画像形成システム１の全体構成及び動作を説明する。 (1) Overall Configuration and Operation of Image Forming System FIG. 1 is a schematic configuration diagram showing an overall appearance of an image forming system 1 to which a sound absorbing structure according to the present embodiment is applied, and FIG. 2 shows an internal configuration of the image forming system 1. FIG. 3 is a schematic cross-sectional view, and FIG. Hereinafter, the overall configuration and operation of the image forming system 1 will be described with reference to the drawings.

図１に示す画像形成システム１は、電子写真方式によって画像を形成するプリンタや複写機等の画像形成装置２と、画像形成装置２によってトナー像が形成された用紙Ｐに後処理を施す後処理装置２００と、画像形成装置２の上面（Ｚ方向）に配置され、画像が記録された用紙Ｐを後処理装置２００へと導く搬送装置１００を備えて構成されている。   An image forming system 1 shown in FIG. 1 is a post-process that performs post-processing on an image forming apparatus 2 such as a printer or a copying machine that forms an image by an electrophotographic method, and a sheet P on which a toner image is formed by the image forming apparatus 2. The apparatus 200 and the conveying apparatus 100 that is disposed on the upper surface (Z direction) of the image forming apparatus 2 and guides the sheet P on which an image is recorded to the post-processing apparatus 200 are configured.

（１．１）画像形成装置２の全体構成と動作
画像形成装置２は、内側部材の一例としての筐体３が形成する内部空間に、制御装置１０、給紙装置２０、感光体ユニット３０、現像装置４０、転写装置５０、定着装置６０、とが配置され、筐体３を覆うように筐体３に取り付けられた内側覆い部材の一例としての外装カバー４で構成されている。 (1.1) Overall Configuration and Operation of Image Forming Apparatus 2 The image forming apparatus 2 includes a control device 10, a paper feeding device 20, a photoconductor unit 30, in an internal space formed by a housing 3 as an example of an inner member. The developing device 40, the transfer device 50, and the fixing device 60 are arranged, and are configured by an exterior cover 4 as an example of an inner covering member attached to the housing 3 so as to cover the housing 3.

制御装置１０は、画像形成装置２の動作を制御する画像形成装置制御部１１と、印刷処理要求に応じた画像データを準備するコントローラ部１２、露光装置ＬＨの点灯を制御する露光制御部１３、電源装置１４等を有する。電源装置１４は、後述する帯電ローラ３２、現像ローラ４２、一次転写ローラ５２、二次転写ローラ５３等に電圧を印加するとともに、露光装置ＬＨに電力を供給する。   The control device 10 includes an image forming device control unit 11 that controls the operation of the image forming device 2, a controller unit 12 that prepares image data according to a print processing request, an exposure control unit 13 that controls lighting of the exposure device LH, It has a power supply device 14 and the like. The power supply device 14 applies a voltage to a charging roller 32, a developing roller 42, a primary transfer roller 52, a secondary transfer roller 53 and the like, which will be described later, and supplies power to the exposure device LH.

コントローラ部１２は、外部の情報送信装置（例えばパーソナルコンピュータ等）から入力された印刷情報を潜像形成用の画像情報に変換して予め設定されたタイミングで、駆動信号を露光装置ＬＨに出力する。本実施形態の露光装置ＬＨは、ＬＥＤ（Light Emitting Diode）が線状に配置されたＬＥＤヘッドにより構成されている。   The controller unit 12 converts print information input from an external information transmission device (for example, a personal computer) into image information for forming a latent image, and outputs a drive signal to the exposure device LH at a preset timing. . The exposure apparatus LH of the present embodiment is configured by an LED head in which LEDs (Light Emitting Diodes) are arranged in a line.

画像形成装置２の底部には、給紙装置２０が設けられている。給紙装置２０は、用紙積載板２１を備え、用紙積載板２１の上面には多数の記録媒体としての用紙Ｐが積載される。用紙積載板２１に積載され、規制板（不図示）で幅方向位置が決められた用紙Ｐは、上側から１枚ずつ用紙引き出し部２２により前方（−Ｘ方向）に引き出された後、レジストローラ対２３のニップ部まで搬送される。   A paper feeding device 20 is provided at the bottom of the image forming apparatus 2. The sheet feeding device 20 includes a sheet stacking plate 21, and a plurality of sheets P as recording media are stacked on the upper surface of the sheet stacking plate 21. The paper P loaded on the paper stacking plate 21 and whose position in the width direction is determined by a regulating plate (not shown) is pulled out one by one from the top by the paper pulling unit 22 (−X direction), and then registered. It is conveyed to the nip portion of the pair 23.

感光体ユニット３０は、給紙装置２０の上方（Ｚ方向）に、それぞれが並列して設けられ、回転駆動する像保持体としての感光体ドラム３１を備えている。感光体ドラム３１の回転方向にそって、帯電ローラ３２、露光装置ＬＨ、現像装置４０、一次転写ローラ５２、クリーニングブレード３４が配置されている。帯電ローラ３２には、帯電ローラ３２の表面をクリーニングするクリーニングローラ３３が対向、接触して配置されている。   The photoconductor unit 30 includes a photoconductor drum 31 that is provided in parallel above the paper feeding device 20 (in the Z direction) and serves as an image carrier that is rotationally driven. A charging roller 32, an exposure device LH, a developing device 40, a primary transfer roller 52, and a cleaning blade 34 are arranged along the rotation direction of the photosensitive drum 31. A cleaning roller 33 for cleaning the surface of the charging roller 32 is disposed opposite to and in contact with the charging roller 32.

現像装置４０は、内部に現像剤が収容される現像ハウジング４１を有する。現像ハウジング４１内には、感光体ドラム３１に対向して配置された現像ローラ４２と、この現像ローラ４２の背面側斜め下方には現像剤を現像ローラ４２側へ撹拌搬送する一対のオーガ４４、４５が配設されている。現像ローラ４２には、現像剤の層厚を規制する層規制部材４６が近接配置されている。
現像装置４０各々は、現像ハウジング４１に収容される現像剤を除いて略同様に構成され、それぞれがイエロー（Ｙ）、マゼンタ（Ｍ）、シアン（Ｃ）、黒（Ｋ）のトナー像を形成する。 The developing device 40 includes a developing housing 41 in which a developer is accommodated. In the developing housing 41, a developing roller 42 disposed to face the photosensitive drum 31, and a pair of augers 44 that stir and convey the developer to the developing roller 42 side obliquely below the back side of the developing roller 42, 45 is arranged. A layer regulating member 46 that regulates the layer thickness of the developer is disposed in proximity to the developing roller 42.
Each of the developing devices 40 is configured in substantially the same manner except for the developer contained in the developing housing 41, and each forms a toner image of yellow (Y), magenta (M), cyan (C), and black (K). To do.

回転する感光体ドラム３１の表面は、帯電ローラ３２により帯電され、露光装置ＬＨから出射する潜像形成光により静電潜像が形成される。感光体ドラム３１上に形成された静電潜像は現像ローラ４２によりトナー像として現像される。   The surface of the rotating photosensitive drum 31 is charged by the charging roller 32, and an electrostatic latent image is formed by the latent image forming light emitted from the exposure device LH. The electrostatic latent image formed on the photosensitive drum 31 is developed as a toner image by the developing roller 42.

転写装置５０は、各感光体ユニット３０の感光体ドラム３１にて形成された各色トナー像が多重転写される中間転写ベルト５１、各感光体ユニット３０にて形成された各色トナー像を中間転写ベルト５１に順次転写（一次転写）する一次転写ローラ５２を備えている。さらに、中間転写ベルト５１上に重畳して転写された各色トナー像を記録媒体である用紙Ｐに一括転写（二次転写）する二次転写ローラ５３、とから構成されている。   The transfer device 50 includes an intermediate transfer belt 51 to which each color toner image formed on the photoconductive drum 31 of each photoconductor unit 30 is transferred, and each color toner image formed on each photoconductor unit 30 to the intermediate transfer belt. A primary transfer roller 52 that sequentially transfers (primary transfer) to 51 is provided. Further, the image forming apparatus includes a secondary transfer roller 53 that collectively transfers (secondary transfer) each color toner image superimposed and transferred onto the intermediate transfer belt 51 onto a sheet P as a recording medium.

各感光体ユニット３０の感光体ドラム３１に形成された各色トナー像は、画像形成装置制御部１１により制御される電源装置１４等から所定の転写電圧が印加された一次転写ローラ５２により中間転写ベルト５１上に順次静電転写（一次転写）され、各色トナーが重畳された重畳トナー像が形成される。   Each color toner image formed on the photosensitive drum 31 of each photosensitive unit 30 is transferred to an intermediate transfer belt by a primary transfer roller 52 to which a predetermined transfer voltage is applied from a power supply device 14 or the like controlled by the image forming apparatus control unit 11. Electrostatic transfer (primary transfer) is sequentially performed on 51, and a superimposed toner image in which toners of respective colors are superimposed is formed.

中間転写ベルト５１上の重畳トナー像は、中間転写ベルト５１の移動に伴って二次転写ローラ５３が配置された領域（二次転写部Ｔ）に搬送される。重畳トナー像が二次転写部Ｔに搬送されると、そのタイミングに合わせて給紙装置２０から用紙Ｐが二次転写部Ｔに供給される。そして、二次転写ローラ５３には、画像形成装置制御部１１により制御される電源装置１４等から所定の転写電圧が印加され、レジストローラ対２３から送り出され、搬送ガイドにより案内された用紙Ｐに中間転写ベルト５１上の多重トナー像が一括転写される。   The superimposed toner image on the intermediate transfer belt 51 is conveyed to a region (secondary transfer portion T) where the secondary transfer roller 53 is disposed as the intermediate transfer belt 51 moves. When the superimposed toner image is conveyed to the secondary transfer unit T, the paper P is supplied from the paper feeding device 20 to the secondary transfer unit T in accordance with the timing. Then, a predetermined transfer voltage is applied to the secondary transfer roller 53 from the power supply device 14 or the like controlled by the image forming apparatus controller 11, and the secondary transfer roller 53 is fed from the registration roller pair 23 to the sheet P guided by the conveyance guide. Multiple toner images on the intermediate transfer belt 51 are collectively transferred.

感光体ドラム３１表面の残留トナーは、クリーニングブレード３４により除去され、廃現像剤収容部に回収される。感光体ドラム３１の表面は、帯電ローラ３２により再帯電される。尚、クリーニングブレード３４で除去しきれず帯電ローラ３２に付着した残留物は、帯電ローラ３２に接触して回転するクリーニングローラ３３表面に捕捉され、蓄積される。   Residual toner on the surface of the photosensitive drum 31 is removed by the cleaning blade 34 and collected in the waste developer container. The surface of the photosensitive drum 31 is recharged by the charging roller 32. Residues that cannot be completely removed by the cleaning blade 34 and adhere to the charging roller 32 are captured and accumulated on the surface of the cleaning roller 33 that rotates in contact with the charging roller 32.

定着装置６０は定着ローラ６１と加圧ローラ６２を有し、定着ローラ６１と加圧ローラ６２の圧接領域によってニップ部Ｎ（定着領域）が形成される。
転写装置５０においてトナー像が転写された用紙Ｐは、トナー像が未定着の状態で搬送ガイドを経由して定着装置６０に搬送される。定着装置６０に搬送された用紙Ｐは、一対の定着ローラ６１と加圧ローラ６２により、圧着と加熱の作用でトナー像が定着される。
定着トナー像が形成された用紙Ｐは、搬送ガイド６５ａ、６５ｂによってガイドされ、排出ローラ対６９から画像形成装置２上面に配置された搬送装置１００へ排出される。 The fixing device 60 includes a fixing roller 61 and a pressure roller 62, and a nip portion N (fixing region) is formed by a pressure contact region between the fixing roller 61 and the pressure roller 62.
The sheet P on which the toner image is transferred in the transfer device 50 is conveyed to the fixing device 60 via the conveyance guide in a state where the toner image is not fixed. The sheet P transported to the fixing device 60 is fixed with a toner image by a pair of fixing roller 61 and pressure roller 62 by the action of pressure bonding and heating.
The sheet P on which the fixed toner image is formed is guided by the transport guides 65a and 65b, and is discharged from the discharge roller pair 69 to the transport apparatus 100 disposed on the upper surface of the image forming apparatus 2.

（１．２）搬送装置
搬送装置１００は、画像形成装置２の排出ローラ対６９を介して出力される用紙Ｐを受け取る入口ローラ１１０と、この入口ローラ１１０にて受け取られた用紙Ｐを下流側へと搬送する第１搬送ローラ１２０と、後処理装置２００に向けて用紙Ｐを搬送する第２搬送ローラ１３０とを有する。 (1.2) Conveying Device The conveying device 100 receives an inlet roller 110 that receives the paper P output via the discharge roller pair 69 of the image forming apparatus 2 and the downstream side of the paper P received by the inlet roller 110. A first conveyance roller 120 that conveys the paper P toward the post-processing apparatus 200, and a second conveyance roller 130 that conveys the paper P toward the post-processing device 200.

入口ローラ１１０、第１搬送ローラ１２０、第２搬送ローラ１３０は、それぞれローラ対を形成し、それぞれのローラ対間には用紙Ｐを下流側に案内する内側部材の一例としての上側案内板１４０と下側案内板１５０とによって用紙案内路が形成されている。   The entrance roller 110, the first transport roller 120, and the second transport roller 130 each form a pair of rollers, and an upper guide plate 140 as an example of an inner member that guides the paper P to the downstream side between each pair of rollers. A sheet guide path is formed by the lower guide plate 150.

（１．３）後処理装置
後処理装置２００は、内側部材の一例としての筐体２３０が形成する内部空間に、受け取りローラ２０１、第１の後処理搬送路Ｓ１と第２の後処理搬送路Ｓ２、パドル２０７、タンパ２０８、コンパイルトレイ２１０、針綴じ機構２２０等が配置され、筐体２３０を覆うように筐体２３０に取り付けられた内側覆い部材の一例としての前後外装カバー２３１、左右外装カバー２３２で構成されている。
左右外装カバー２３２から外部には、排出された用紙Ｐが積載されるトップトレイＴＲ１と、後処理された用紙束ＰＢが積載されるスタッカトレイＴＲ２が配置されている。 (1.3) Post-Processing Device The post-processing device 200 has a receiving roller 201, a first post-processing transport path S1, and a second post-processing transport path in an internal space formed by a housing 230 as an example of an inner member. S2, paddle 207, tamper 208, compile tray 210, staple binding mechanism 220, etc. are arranged, and front and rear exterior covers 231 and left and right exterior covers as an example of inner covering members attached to the housing 230 so as to cover the housing 230 232.
Outside the left and right exterior covers 232, a top tray TR1 on which discharged paper P is stacked and a stacker tray TR2 on which post-processed paper bundles PB are stacked are arranged.

また、後処理装置２００は、搬送装置１００から用紙Ｐを受け取る受け取りローラ２０１の下流側に第１の後処理搬送路Ｓ１と第２の後処理搬送路Ｓ２とを有し、この第１の後処理搬送路Ｓ１と第２の後処理搬送路Ｓ２とは後処理切り替えゲートＧにより選択されるようになっている。
第１の後処理搬送路Ｓ１は、トップトレイＴＲ１に接続されており、この第１の後処理搬送路Ｓ１からは排出ローラ２０２により後処理がなされない用紙Ｐが排出される。 Further, the post-processing device 200 includes a first post-processing transport path S1 and a second post-processing transport path S2 on the downstream side of the receiving roller 201 that receives the paper P from the transport device 100. The processing transport path S1 and the second post-processing transport path S2 are selected by a post-processing switching gate G.
The first post-processing transport path S1 is connected to the top tray TR1, and the paper P that is not subjected to post-processing is discharged from the first post-processing transport path S1 by the discharge roller 202.

後処理装置２００は、第２の後処理搬送路Ｓ２の下流側に設けられ用紙Ｐを複数枚集めて収容するコンパイルトレイ２１０と、コンパイルトレイ２１０に向けて用紙Ｐを排出する一対のローラである排出ローラ２０４とを備えている。   The post-processing device 200 is provided on the downstream side of the second post-processing conveyance path S <b> 2, and includes a compile tray 210 that collects and stores a plurality of sheets P, and a pair of rollers that discharge the sheets P toward the compile tray 210. And a discharge roller 204.

また、後処理装置２００は、用紙Ｐをコンパイルトレイ２１０のエンドガイド２１０ｂに向けて押し込むよう回転するパドル２０７と、用紙Ｐの端部を揃えるためのタンパ２０８とを備えている。
さらに、後処理装置２００は、コンパイルトレイ２１０に集積された用紙束ＰＢの端部を綴じる針綴じ機構２２０を有し、綴じられた用紙束ＰＢはイジェクトローラ（用紙束搬送ローラ）２０９によって搬送、排出される。
そして、後処理装置２００は、イジェクトローラ２０９によって排出された用紙束ＰＢを使用者が取りやすいようにして積み重ねるスタッカトレイＴＲ２を備え、スタッカトレイＴＲ２は、後処理装置２００の本体に設けられた昇降装置で昇降する。 The post-processing apparatus 200 includes a paddle 207 that rotates to push the paper P toward the end guide 210 b of the compilation tray 210, and a tamper 208 that aligns the ends of the paper P.
Further, the post-processing device 200 has a staple binding mechanism 220 that binds the end of the sheet bundle PB accumulated on the compilation tray 210, and the bound sheet bundle PB is conveyed by an eject roller (sheet bundle conveyance roller) 209. Discharged.
The post-processing device 200 includes a stacker tray TR2 that stacks the sheet bundle PB discharged by the eject roller 209 so that the user can easily take the stack, and the stacker tray TR2 is raised and lowered provided in the main body of the post-processing device 200. Move up and down with the device.

（２）吸音構造の構成
このように構成される画像形成システム１は、画像形成装置２、搬送装置１００及び後処理装置２００のそれぞれが、装置の内部機構を保持又は支持する内側部材の一例としての筐体と、筐体にその内部を覆う状態で取り付けられる内側覆い部材の一例としての外装カバーと、筐体と外装カバーとの間で筐体又は外装カバーに固定された遮音部材の一例としての吸音材とからなる吸音構造を備えている。
以下、搬送装置１００及び後処理装置２００に適用される吸音構造の構成について図面を参照しながら説明する。 (2) Configuration of Sound Absorption Structure In the image forming system 1 configured as described above, each of the image forming apparatus 2, the transport apparatus 100, and the post-processing apparatus 200 is an example of an inner member that holds or supports the internal mechanism of the apparatus. As an example of a sound insulation member fixed to the housing or the exterior cover between the housing and the exterior cover, and an exterior cover as an example of an inner cover member attached to the housing in a state of covering the interior of the housing It has a sound absorbing structure consisting of a sound absorbing material.
Hereinafter, the structure of the sound absorbing structure applied to the transport apparatus 100 and the post-processing apparatus 200 will be described with reference to the drawings.

（２．１）搬送装置の吸音構造
図４は搬送装置１００における吸音構造を示す断面模式図、図５（ａ）は搬送装置１００の上側外装カバー１４１を取り外した内部構成斜視図、図５（ｂ）は下側吸音材１５５側に視点をおいた内部構成斜視図である。 (2.1) Sound Absorbing Structure of Conveying Device FIG. 4 is a schematic cross-sectional view showing the sound absorbing structure of the conveying device 100, FIG. 5 (a) is an internal configuration perspective view with the upper outer cover 141 removed of the conveying device 100, and FIG. FIG. 7B is a perspective view of the internal configuration with a viewpoint on the lower sound absorbing material 155 side.

吸音構造は、内側部材の一例としての上側案内板１４０及び下側案内板１５０と、内側覆い部材の一例としての上側外装カバー１４１及び下側外装カバー１５１と、遮音部材の一例としての上側吸音材１４５及び下側吸音材１５５と、上側吸音材１４５及び下側吸音材１５５を、それぞれ上側案内板１４０及び下側案内板１５０へ固定する固定部材の一例としての吸音材保持部材１６０とから構成されている。   The sound absorbing structure includes an upper guide plate 140 and a lower guide plate 150 as examples of the inner member, an upper exterior cover 141 and a lower exterior cover 151 as examples of the inner cover member, and an upper sound absorbing material as an example of the sound insulation member. 145 and the lower sound absorbing material 155, and the sound absorbing material holding member 160 as an example of a fixing member for fixing the upper sound absorbing material 145 and the lower sound absorbing material 155 to the upper guide plate 140 and the lower guide plate 150, respectively. ing.

図４（ａ）に示すように、上側吸音材１４５は、例えばシート状のウレタンフォーム製とされ、厚み方向において一面１４５ａから他面１４５ｂにまで貫通する貫通孔１４６を有する。
上側外装カバー１４１には、内面１４１ａ側に突起部の一例としてのボス部１４２が突設され、ボス部１４２にはネジ孔１４３が設けられている。 As shown in FIG. 4A, the upper sound absorbing material 145 is made of, for example, a sheet-like urethane foam, and has a through hole 146 that penetrates from one surface 145a to the other surface 145b in the thickness direction.
The upper exterior cover 141 is provided with a boss portion 142 as an example of a protruding portion on the inner surface 141 a side, and the boss portion 142 is provided with a screw hole 143.

吸音材保持部材１６０は、上側吸音材１４５の貫通孔１４６が挿入される筒部１６１と、筒部１６１の筒軸心方向に設けられたフランジ状鍔部１６２とからなり、筒部１６１の内底面１６１ａには孔１６３が形成されている。   The sound absorbing material holding member 160 includes a cylindrical portion 161 into which the through hole 146 of the upper sound absorbing material 145 is inserted, and a flange-like flange portion 162 provided in the cylindrical axis direction of the cylindrical portion 161. A hole 163 is formed in the bottom surface 161a.

上側吸音材１４５は、上側外装カバー１４１のボス部１４２に貫通孔１４６が挿入されて、上側吸音材１４５の他面１４５ｂが上側外装カバー１４１の内面１４１ａに対峙した状態で、上側吸音材１４５の一面１４５ａから貫通孔１４６に吸音材保持部材１６０の筒部１６１を挿入して、固定ネジＷでネジ止めされる。
その結果、上側案内板１４０と上側外装カバー１４１との間で、上側吸音材１４５が上側外装カバー１４１の内面１４１ａに対峙した状態で固定され吸音構造を形成する。 The upper sound absorbing material 145 has a through hole 146 inserted into the boss 142 of the upper outer cover 141, and the other surface 145b of the upper sound absorbing material 145 faces the inner surface 141a of the upper outer cover 141. The cylindrical portion 161 of the sound absorbing material holding member 160 is inserted into the through hole 146 from the one surface 145a, and is fixed with a fixing screw W.
As a result, the upper sound absorbing material 145 is fixed between the upper guide plate 140 and the upper outer cover 141 while facing the inner surface 141a of the upper outer cover 141 to form a sound absorbing structure.

図４（ｂ）に示すように、内側部材の一例としての下側案内板１５０には、外面１５０ａ側に突起部の一例としてのボス部１５２が突設され、ボス部１５２にはネジ孔１５３が設けられている。   As shown in FIG. 4B, a lower guide plate 150 as an example of an inner member is provided with a boss portion 152 as an example of a protruding portion on the outer surface 150 a side, and a screw hole 153 is provided in the boss portion 152. Is provided.

下側吸音材１５５は、下側案内板１５０のボス部１５２に貫通孔１５６が挿入されて、下側吸音材１５５の他面１５５ｂが下側案内板１５０の外面１５０ａに対峙した状態で、下側吸音材１５５の一面１５５ａから貫通孔１５６に吸音材保持部材１６０の筒部１６１を挿入して、固定ネジＷでネジ止めされる。
その結果、下側案内板１５０と下側外装カバー１５１との間で、下側吸音材１５５が下側外装カバー１５１の内面１５１ａに対峙した状態で固定され吸音構造を形成する。 The lower sound absorbing material 155 has a through hole 156 inserted into the boss portion 152 of the lower guide plate 150 and the other surface 155b of the lower sound absorbing material 155 faces the outer surface 150a of the lower guide plate 150. The cylindrical portion 161 of the sound absorbing material holding member 160 is inserted into the through hole 156 from the one surface 155a of the side sound absorbing material 155, and is fixed with a fixing screw W.
As a result, the lower sound absorbing material 155 is fixed between the lower guide plate 150 and the lower outer cover 151 in a state of facing the inner surface 151a of the lower outer cover 151 to form a sound absorbing structure.

尚、図４（ｃ）に示すように、上側吸音材１４５は、上側外装カバー１４１のボス部１４２に突起１４４を形成して吸音材保持部材１６０の筒部１６１の内底面１６１ａ形成された孔１６３とスナップフィットで固定されても良い。
また、上側吸音材１４５及び下側吸音材１５５をシート状のウレタンフォームから形成する場合には、みかけ密度は０．０６〜０．１２ｇ／ｃｍ３ 程度が好ましく、シート材としての厚みは、発泡体の難燃性規格（一例としてＵＬ−９４ ＨＦ−１）を満たすためには１３ｍｍ以下であることが好ましい。 As shown in FIG. 4C, the upper sound absorbing material 145 has a hole formed in the inner bottom surface 161 a of the cylindrical portion 161 of the sound absorbing material holding member 160 by forming a protrusion 144 on the boss portion 142 of the upper outer cover 141. 163 and snap fit may be used.
When the upper sound absorbing material 145 and the lower sound absorbing material 155 are formed from sheet-like urethane foam, the apparent density is preferably about 0.06 to 0.12 g / cm 3 , and the thickness as the sheet material is foamed. In order to satisfy the flame retardance standard of the body (UL-94 HF-1 as an example), it is preferably 13 mm or less.

尚、上側吸音材１４５及び下側吸音材１５５を多孔質の弾性変形可能材で構成する場合には、グラスウール、フェルト、植物繊維系フェルト、合成繊維系フェルト、不織布のいずれか、又はこれらの混合物からなるシート材で形成することもできる。   When the upper sound absorbing material 145 and the lower sound absorbing material 155 are made of a porous elastic deformable material, any of glass wool, felt, vegetable fiber felt, synthetic fiber felt, nonwoven fabric, or a mixture thereof It can also be formed of a sheet material made of

（２．２）後処理装置の吸音構造
図６は後処理装置２００における吸音構造を示す断面模式図、図７は後処理装置２００の前後外装カバー２３１の内面側を示す斜視図、図８は後処理装置２００の左右外装カバー２３２の内面側を示す斜視図である。 (2.2) Sound Absorption Structure of Post-Processing Device FIG. 6 is a schematic sectional view showing the sound absorption structure in the post-processing device 200, FIG. 7 is a perspective view showing the inner surface side of the front and rear exterior cover 231 of the post-processing device 200, and FIG. 4 is a perspective view showing the inner surface side of the left and right exterior covers 232 of the post-processing apparatus 200. FIG.

図６に示すように、吸音材２４５、２５５は、シート状のウレタンフォーム製とされ、厚み方向においてそれぞれ貫通孔２４６、２５６を有する。
それぞれの吸音材２４５、２５５は、発泡密度が異なるシート材を用いても良く、同じ発泡密度のシート材を用いても良い。 As shown in FIG. 6, the sound absorbing materials 245 and 255 are made of sheet-like urethane foam and have through holes 246 and 256 in the thickness direction, respectively.
As the respective sound absorbing materials 245 and 255, sheet materials having different foam densities may be used, or sheet materials having the same foam density may be used.

前後外装カバー２３１には、内面２３１ａ側に複数の補強リブ２３３とボス部２３４が突設され、ボス部２３４にはネジ孔２３５が設けられている。
そして、吸音材２４５、２５５は、貫通孔２４６、２５６が前後外装カバー２３１のボス部２３４に挿入されて重ね合わされた状態で、吸音材保持部材１６０を介して、固定ネジＷでネジ止めされる。
その結果、後処理装置２００の筐体２３０と前後外装カバー２３１との間で、吸音材２４５、２５５が前後外装カバー２３１の内面２３１ａに形成された補強リブ２３３の先端部２３３ａに対峙した状態で固定され吸音構造を形成する。 The front and rear exterior cover 231 is provided with a plurality of reinforcing ribs 233 and a boss portion 234 on the inner surface 231 a side, and a screw hole 235 is provided in the boss portion 234.
The sound absorbing material 245, 255 is screwed with a fixing screw W via the sound absorbing material holding member 160 in a state where the through holes 246, 256 are inserted into and overlapped with the boss portions 234 of the front and rear exterior covers 231. .
As a result, between the housing 230 of the post-processing apparatus 200 and the front and rear exterior covers 231, the sound absorbing materials 245 and 255 are opposed to the front end portions 233 a of the reinforcing ribs 233 formed on the inner surface 231 a of the front and rear exterior covers 231. It is fixed and forms a sound absorbing structure.

図７はこのように構成された吸音構造を備えた後処理装置２００の前後外装カバー２３１の内面側を示している。図７に示すように、吸音材２５５ａ、２５５ｂ、２５５ｃがそれぞれ前後外装カバー２３１の内面２３１ａに吸音材保持部材１６０を介して固定され、後処理装置２００における前後方向の吸音構造を構成している。   FIG. 7 shows the inner surface side of the front / rear exterior cover 231 of the post-processing apparatus 200 having the sound absorbing structure configured as described above. As shown in FIG. 7, the sound absorbing materials 255a, 255b, and 255c are fixed to the inner surface 231a of the front and rear exterior covers 231 via the sound absorbing material holding member 160, respectively, and constitute the sound absorbing structure in the front and rear direction in the post-processing device 200. .

図８はこのように構成された吸音構造を備えた後処理装置２００の左右外装カバー２３２の内面側を示している。図８に示すように、吸音材２５５ｄが左右外装カバー２３２の内面２３２ａに吸音材保持部材１６０を介して固定され、後処理装置２００における左右方向の吸音構造を構成している。   FIG. 8 shows the inner surface side of the left and right exterior covers 232 of the post-processing apparatus 200 having the sound absorbing structure configured as described above. As shown in FIG. 8, the sound absorbing material 255 d is fixed to the inner surface 232 a of the left and right exterior covers 232 via the sound absorbing material holding member 160, and constitutes a sound absorbing structure in the left-right direction in the post-processing device 200.

（３）吸音構造の作用
図９は外装カバー３００に吸音材３１０を貼付した比較例の吸音構造の断面模式図である。
本実施形態に係る吸音構造の作用を説明するまえに、比較例の吸音構造の問題点について説明する。尚、以下の説明において、同一の構成要素には同一の符号を付してその詳細な説明は省略する。 (3) Action of Sound Absorption Structure FIG. 9 is a schematic cross-sectional view of a sound absorption structure of a comparative example in which a sound absorbing material 310 is attached to the exterior cover 300.
Before describing the operation of the sound absorbing structure according to the present embodiment, problems of the sound absorbing structure of the comparative example will be described. In the following description, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

（３．１）比較例１の吸音構造
図９（ａ）に示すように、比較例１に係る吸音構造は、外装カバー３００と、吸音材３１０とからなる。外装カバー３００の内面３００ａには、複数の補強リブ３０１が形成されている。
吸音材３１０は、ウレタンフォーム製とされ、補強リブ３０１で囲まれたそれぞれの領域の内面３００ａに両面テープＡＤを介して貼付されている。 (3.1) Sound Absorbing Structure of Comparative Example 1 As shown in FIG. 9A, the sound absorbing structure according to Comparative Example 1 includes an exterior cover 300 and a sound absorbing material 310. A plurality of reinforcing ribs 301 are formed on the inner surface 300 a of the exterior cover 300.
The sound absorbing material 310 is made of urethane foam, and is affixed to the inner surface 300a of each region surrounded by the reinforcing ribs 301 via a double-sided tape AD.

その結果、画像形成装置内部からの音は、吸音材３１０のフォームを形成する個々の空隙セル内で吸収と反射を繰り返しながら減衰して、外装カバー３００の外部への伝播が抑制され、いわゆる静音効果が発揮される。   As a result, the sound from the inside of the image forming apparatus is attenuated while being repeatedly absorbed and reflected in the individual void cells forming the foam of the sound absorbing material 310, and the propagation to the outside of the exterior cover 300 is suppressed. The effect is demonstrated.

一方、それぞれの吸音材３１０は、補強リブ３０１で囲まれたそれぞれの領域の平面形状に合わせて準備され、平面形状の異なる多数の吸音材３１０が必要であった。
また、形状の異なるそれぞれの吸音材３１０を、補強リブ３０１で囲まれたそれぞれの領域に両面テープＡＤを介して貼付するためにコストが掛かり、また合成樹脂で形成された外装カバー３００にウレタンフォーム等の異種材料を貼付すると樹脂のリサイクルが難しくなる。
すなわち外装カバー３００の内面壁に遮音部材としての吸音材３１０を貼り付けることで静音効果は高くなるが、生産工程が複雑になる上に、外装材のリサイクルが難しくなるという問題があった。 On the other hand, each sound absorbing material 310 is prepared in accordance with the planar shape of each region surrounded by the reinforcing ribs 301, and many sound absorbing materials 310 having different planar shapes are required.
In addition, it is costly to attach each sound absorbing material 310 having a different shape to each region surrounded by the reinforcing ribs 301 via the double-sided tape AD, and urethane foam is applied to the exterior cover 300 made of synthetic resin. If different materials such as are attached, recycling of the resin becomes difficult.
That is, although the noise reduction effect is enhanced by attaching the sound absorbing material 310 as a sound insulating member to the inner wall of the exterior cover 300, there are problems that the production process becomes complicated and the recycling of the exterior material becomes difficult.

（３．２）比較例２の吸音構造
図９（ｂ）に示すように、比較例２に係る吸音構造は、外装カバー３００に、吸音材３１０が両面テープＡＤを介して貼付され、更に吸音材３２０が両面テープＡＤで重ねられて貼付されている。外装カバー３００の内面３００ａには、複数の補強リブ３０１が形成されている。
吸音材３１０、３２０は、ウレタンフォーム製とされ、補強リブ３０１で囲まれたそれぞれの領域の内面３００ａに両面テープＡＤを介して貼付されている。 (3.2) Sound Absorbing Structure of Comparative Example 2 As shown in FIG. 9B, the sound absorbing structure according to Comparative Example 2 has a sound absorbing material 310 attached to the exterior cover 300 via the double-sided tape AD, and further the sound absorbing structure. A material 320 is laminated and pasted with a double-sided tape AD. A plurality of reinforcing ribs 301 are formed on the inner surface 300 a of the exterior cover 300.
The sound absorbing materials 310 and 320 are made of urethane foam, and are affixed to the inner surface 300a of each region surrounded by the reinforcing ribs 301 via a double-sided tape AD.

比較例２の吸音構造においては、吸音材３２０は、両面テープＡＤを介して重ね合わされているために、筐体側の吸音材３２０の空隙セル内を通過した音（図中、Ｉｉ参照）の一部は、両面テープＡＤ表面で反射され（図中、Ｉｒ参照）、外装カバー３００側に貼付された吸音材３１０へ伝達されない。その結果、重ね合わされた吸音材３２０の厚みが厚くなったにも拘わらず、より高い静音効果が得られないという問題があった。   In the sound absorbing structure of Comparative Example 2, since the sound absorbing material 320 is superposed via the double-sided tape AD, one of the sounds (see Ii in the figure) that has passed through the void cell of the sound absorbing material 320 on the housing side. The part is reflected on the surface of the double-sided tape AD (see Ir in the figure), and is not transmitted to the sound absorbing material 310 attached to the exterior cover 300 side. As a result, there is a problem that a higher noise reduction effect cannot be obtained even though the thickness of the superimposed sound absorbing material 320 is increased.

（３．３）本実施形態の吸音構造
本実施形態の吸音構造は、一例として、後処理装置２００の筐体２３０と前後外装カバー２３１との間で、吸音材２４５、２５５が前後外装カバー２３１の内面２３１ａに形成された補強リブ２３３の先端部２３３ａに対峙した状態で吸音材保持部材１６０を介して固定され吸音構造を形成する。
そのために、前後外装カバー２３１の内面２３１ａ側に複数の補強リブ２３３が形成されていても、シート状の吸音材２４５、２５５が前後外装カバー２３１の内面２３１ａを一体として覆うために、吸音材２４５、２５５を、それぞれの補強リブ２３３で囲まれたそれぞれの領域の平面形状に合わせて両面テープ等で貼付するためのコストが削減され、また前後外装カバー２３１のリサイクルも容易となる。 (3.3) Sound absorption structure of this embodiment As an example, the sound absorption structure of this embodiment is such that the sound absorbing materials 245 and 255 are disposed between the front and rear exterior covers 231 between the housing 230 of the post-processing device 200 and the front and rear exterior covers 231. A sound absorbing structure is formed by being fixed via a sound absorbing material holding member 160 in a state of being opposed to the tip end portion 233a of the reinforcing rib 233 formed on the inner surface 231a.
Therefore, even if the plurality of reinforcing ribs 233 are formed on the inner surface 231a side of the front and rear exterior cover 231, the sheet-like sound absorbing material 245 and 255 cover the inner surface 231a of the front and rear exterior cover 231 as one body. The cost for sticking H.255 with a double-sided tape or the like in accordance with the planar shape of each region surrounded by each reinforcing rib 233 is reduced, and the front and rear exterior cover 231 can be easily recycled.

音源からの音波が吸音材２４５、２５５に入射した場合、空隙セル部分の空気が振動し、この空気の粘性抵抗によって音波のエネルギーが熱エネルギーに変換されて吸音が行われる。そのために、吸音材２４５、２５５の厚みを増した場合には、吸音材内部での空気振動が大きくなり、静音効果を高くすることができる。
吸音材２４５、２５５は、それぞれが発泡体の難燃性規格（一例としてＵＬ−９４ ＨＦ−１）を満たす１３ｍｍ以下の厚みで形成され、複数の吸音材を重ねて固定することができる。そのために、遮音部材としての厚さを発泡体の難燃性規格（ＵＬ−９４ ＨＦ−１）の制約を受けることなく厚くすることができ、静音効果を高くすることができる。 When sound waves from the sound source are incident on the sound absorbing materials 245 and 255, the air in the void cell portion vibrates, and the sound wave energy is converted into heat energy by the viscous resistance of the air to absorb the sound. Therefore, when the thickness of the sound absorbing material 245, 255 is increased, the air vibration inside the sound absorbing material is increased, and the silent effect can be enhanced.
Each of the sound absorbing materials 245 and 255 is formed with a thickness of 13 mm or less that satisfies the flame retardancy standard of foam (for example, UL-94 HF-1), and a plurality of sound absorbing materials can be stacked and fixed. Therefore, the thickness as the sound insulating member can be increased without being restricted by the flame retardancy standard (UL-94 HF-1) of the foam, and the silent effect can be enhanced.

上述した実施形態では、搬送装置１００の上側外装カバー１４１、下側案内板１５０及び後処理装置２００の前後外装カバー２３１、左右外装カバー２３２に吸音材保持部材１６０を介して遮音部材としての吸音材を固定したが、画像形成装置２の内側部材である筐体３及び内側覆い部材である外装カバー４に吸音材保持部材１６０を介して遮音部材としての吸音材を固定した吸音構造とすることもできる。   In the above-described embodiment, the sound absorbing material as a sound insulating member is provided on the upper exterior cover 141, the lower guide plate 150 of the transport device 100, the front and rear exterior covers 231 of the post-processing device 200, and the left and right exterior covers 232 via the sound absorbing material holding member 160. However, a sound absorbing structure in which a sound absorbing material as a sound insulating member is fixed to a housing 3 as an inner member of the image forming apparatus 2 and an exterior cover 4 as an inner covering member via a sound absorbing material holding member 160 may be adopted. it can.

１・・・画像形成システム
２・・・画像形成装置
１０・・・制御装置
２０・・・給紙装置
３０・・・感光体ユニット
４０・・・現像装置
５０・・・転写装置
６０・・・定着装置
１００・・・搬送装置
１４０・・・上側案内板
１４１・・・上側外装カバー
１４２、１５２・・・ボス部
１４３、１５３・・・ネジ孔
１４４・・・突起
１４５・・・上側吸音材
１４６、１５６・・・貫通孔
１５０・・・下側案内板
１５１・・・下側外装カバー
１５５・・・下側吸音材
１６０・・・吸音材保持部材
１６１・・・筒部
１６２・・・フランジ状鍔部
１６３・・・孔
２００・・・後処理装置
２３０・・・筐体
２３１・・・前後外装カバー
２３２・・・左右外装カバー
２３３、３０１・・・補強リブ
２３４・・・ボス部
２３５・・・ネジ孔
２４５、２５５、３１０、３２０・・・吸音材
２４６、２５６・・・貫通孔
３００・・・外装カバー
ＡＤ・・・両面テープ
Ｗ・・・固定ネジ

DESCRIPTION OF SYMBOLS 1 ... Image forming system 2 ... Image forming apparatus 10 ... Control apparatus 20 ... Paper feeding apparatus 30 ... Photoconductor unit 40 ... Developing apparatus 50 ... Transfer apparatus 60 ... Fixing device 100... Conveying device 140... Upper guide plate 141.
142, 152 ... Boss part 143, 153 ... Screw hole 144 ... Projection 145 ... Upper sound absorbing material
146, 156 ... through hole
DESCRIPTION OF SYMBOLS 150 ... Lower side guide plate 151 ... Lower side exterior cover 155 ... Lower side sound-absorbing material 160 ... Sound-absorbing material holding member 161 ... Tube part 162 ... Flange-like collar part 163 ... Hole 200 ... aftertreatment device
230 ... Case 231 ... Front and rear exterior covers 232 ... Left and right exterior covers 233, 301 ... Reinforcing ribs 234 ... Boss portions 235 ... Screw holes 245, 255, 310, 320 ... Sound absorbing material 246, 256 ... through hole 300 ... exterior cover AD ... double-sided tape W ... fixing screw

Claims (6)

内側部材と、
前記内側部材にその内部を覆う状態で取り付けられる内側覆い部材と、
前記内側部材及び前記内側覆い部材への対峙面を有して配置された遮音部材と、を有し、
前記遮音部材が、厚み方向において一面側から他面側にまで貫通する貫通孔を有し前記内側部材又は前記内側覆い部材に設けられた突起部が前記遮音部材の一面側から前記貫通孔に挿入され、前記遮音部材の他面側から固定部材で固定された、
ことを特徴とする吸音構造。 An inner member;
An inner covering member attached to the inner member in a state of covering the inside;
A sound insulating member disposed with a facing surface to the inner member and the inner covering member, and
The sound insulation member has a through hole penetrating from one surface side to the other surface side in the thickness direction, and a protrusion provided on the inner member or the inner cover member is inserted into the through hole from one surface side of the sound insulation member. And fixed by a fixing member from the other surface side of the sound insulating member,
Sound absorbing structure characterized by that. 前記固定部材が、前記遮音部材の前記貫通孔が挿入される筒部と、前記筒部の筒軸心方向に設けられたフランジ状鍔部とを有し、
前記遮音部材の一面に前記フランジ状鍔部が面接触し前記内側部材又は前記内側覆い部材に設けられた前記突起部に締結部材を用いて締結されている、
ことを特徴とする請求項１に記載の吸音構造。 The fixing member has a cylindrical portion into which the through hole of the sound insulating member is inserted, and a flange-like flange portion provided in a cylindrical axis direction of the cylindrical portion,
The flange-shaped flange portion is in surface contact with one surface of the sound insulating member and is fastened using a fastening member to the protrusion provided on the inner member or the inner covering member.
The sound absorbing structure according to claim 1. 前記締結部材がネジ又はスナップフィット部材である、
ことを特徴とする請求項１又は２に記載の吸音構造。 The fastening member is a screw or a snap fit member;
The sound absorbing structure according to claim 1 or 2, wherein 前記遮音部材が複数のシート材からなる、
ことを特徴とする請求項１ないし３のいずれか１項に記載の吸音構造。 The sound insulation member is composed of a plurality of sheet materials,
The sound absorbing structure according to any one of claims 1 to 3, wherein the sound absorbing structure is provided. 前記遮音部材が、軟質フォーム材又は多孔質の弾性変形可能材である、
ことを特徴とする請求項１ないし４のいずれか１項に記載の吸音構造。 The sound insulation member is a flexible foam material or a porous elastically deformable material,
The sound absorbing structure according to any one of claims 1 to 4, wherein the sound absorbing structure is provided. 前記内側覆い部材の前記遮音部材と接触する側に補強用リブが設けられている、
ことを特徴とする請求項１ないし５のいずれか１項に記載の吸音構造。 Reinforcing ribs are provided on the side of the inner covering member that contacts the sound insulation member.
The sound absorbing structure according to any one of claims 1 to 5, wherein the sound absorbing structure is provided.
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