JP6402385B2 - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

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JP6402385B2
JP6402385B2 JP2014254235A JP2014254235A JP6402385B2 JP 6402385 B2 JP6402385 B2 JP 6402385B2 JP 2014254235 A JP2014254235 A JP 2014254235A JP 2014254235 A JP2014254235 A JP 2014254235A JP 6402385 B2 JP6402385 B2 JP 6402385B2
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nip portion
fixing member
roller
additional
fixing
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JP2016114834A (en
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慶太 斉藤
慶太 斉藤
翠 下村
翠 下村
信一 矢吹
信一 矢吹
昇 大本
昇 大本
忠康 関岡
忠康 関岡
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Konica Minolta Inc
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Description

本発明は、画像形成装置、特に、プリンタや複写機など、記録媒体上に転写されたトナーを定着装置で定着させる、電子写真方式による画像形成装置に関する。   The present invention relates to an image forming apparatus, and more particularly to an electrophotographic image forming apparatus, such as a printer or a copying machine, that fixes toner transferred onto a recording medium with a fixing device.

電子写真方式による複写機やプリンタなどの画像形成装置においては、トナーの定着装置から、揮発性有機化合物（ＶＯＣ）や超微小粒子（ＵＦＰ）などが発生する。これらの主たる発生源の一つがトナーであると見られ、以下では微小粒子と記載する。そして、近年では環境意識への高まりによって、微小粒子の装置外への排出が問題とされている。   In an image forming apparatus such as an electrophotographic copying machine or printer, a volatile organic compound (VOC), ultrafine particles (UFP), or the like is generated from a toner fixing device. One of these main sources appears to be toner and will be referred to below as microparticles. In recent years, due to an increase in environmental awareness, discharge of fine particles to the outside of the apparatus is a problem.

微小粒子対策として、一般的には、画像形成装置に微量粒子を捕捉するフィルタを設置している。フィルタによる微小粒子の捕捉効率はほぼ１００％であるが、微小粒子を発生源である定着装置（特に、定着ニップ部）からフィルタに導くまでに、微小粒子が装置外に漏れ出るという問題を生じている。   As a measure against fine particles, generally, a filter that captures trace particles is installed in an image forming apparatus. Although the capture efficiency of the fine particles by the filter is almost 100%, there is a problem that the fine particles leak out of the apparatus before the fine particles are guided from the fixing device (particularly, the fixing nip portion) to the filter. ing.

特許文献１では、微小粒子の漏れを少なくするために、ファンを備えた吸引ダクトを定着ニップ部の近傍に設置することを提案している。しかし、ニップ部を構成しているローラやベルトは回転しているため、ダクトを接触させての吸引は困難であり、微小粒子の飛散を抑制する十分な効果を期待できない。   Patent Document 1 proposes that a suction duct provided with a fan be installed in the vicinity of the fixing nip portion in order to reduce leakage of fine particles. However, since the rollers and belts constituting the nip portion are rotating, it is difficult to perform suction by bringing the duct into contact with each other, and a sufficient effect of suppressing scattering of fine particles cannot be expected.

特開２００６−８４６９４号公報JP 2006-84694 A

本発明の目的は、定着ニップ部で発生する微小粒子を外部に飛散することを極力抑制して捕集することのできる画像形成装置を提供することにある。   An object of the present invention is to provide an image forming apparatus capable of collecting the fine particles generated at the fixing nip portion while suppressing the scattering to the outside as much as possible.

本発明の一形態である画像形成装置は、
記録媒体上に転写されたトナーを定着装置で定着させる、電子写真方式による画像形成装置において、
記録媒体が搬送される搬送路の一部を構成するニップ部を形成する定着部材と、
前記ニップ部の搬送方向下流側に配置された追加部材と、
少なくとも前記定着部材と前記追加部材とで形成される微小粒子捕集空間と、
前記微小粒子捕集空間の空気を所定の方向に流動させる空気流発生部材と、
前記空気流発生部材によって生じた空気流中に含まれる微小粒子を捕集するフィルタ部材と、
を備え、
前記定着部材は、前記ニップ部の上側に配置された上側定着部材と、下側に配置された下側定着部材とからなり、
前記追加部材は前記上側定着部材に接するとともに前記ニップ部の搬送方向下流側の搬送路に臨む一つのローラ部材からなること、
を特徴とする。
本発明の他の形態である画像形成装置は、
記録媒体上に転写されたトナーを定着装置で定着させる、電子写真方式による画像形成装置において、
記録媒体が搬送される搬送路の一部を構成するニップ部を形成する定着部材と、
前記ニップ部の搬送方向下流側に配置された追加部材と、
少なくとも前記定着部材と前記追加部材とで形成される微小粒子捕集空間と、
前記微小粒子捕集空間の空気を所定の方向に流動させる空気流発生部材と、
前記空気流発生部材によって生じた空気流中に含まれる微小粒子を捕集するフィルタ部材と、
を備え、
前記定着部材は、前記ニップ部の上側に配置された上側定着部材と、下側に配置された下側定着部材とからなり、
前記追加部材は、前記ニップ部の搬送方向下流側の搬送路に臨む第１ローラ部材と、前記第１ローラ部材及び前記上側定着部材に接する第２ローラ部材とからなること、
を特徴とする。
本発明のさらに他の形態である画像形成装置は、
記録媒体上に転写されたトナーを定着装置で定着させる、電子写真方式による画像形成装置において、
記録媒体が搬送される搬送路の一部を構成するニップ部を形成する定着部材と、
前記ニップ部の搬送方向下流側に配置された追加部材と、
少なくとも前記定着部材と前記追加部材とで形成される微小粒子捕集空間と、
前記微小粒子捕集空間の空気を所定の方向に流動させる空気流発生部材と、
前記空気流発生部材によって生じた空気流中に含まれる微小粒子を捕集するフィルタ部材と、
を備え、
前記定着部材は、前記ニップ部の上側に配置された上側定着部材と、下側に配置された下側定着部材とからなり、
前記追加部材は、前記下側定着部材に接して搬送路の一部を構成する第２ニップを形成するローラ部材と、少なくとも前記上側定着部材及び前記ローラ部材に無端状に張架されたベルト部材とからなり、
前記微小粒子捕集空間は、前記ニップ部と前記第２ニップ部との間であって前記下側定着部材と前記ベルト部材とで形成されること、
を特徴とする。
An image forming apparatus according to an aspect of the present invention is
In an electrophotographic image forming apparatus in which toner transferred onto a recording medium is fixed by a fixing device.
A fixing member that forms a nip portion that constitutes a part of a conveyance path through which the recording medium is conveyed;
An additional member disposed on the downstream side in the conveyance direction of the nip portion;
A microparticle collection space formed by at least the fixing member and the additional member;
An air flow generating member that causes the air in the microparticle collection space to flow in a predetermined direction;
A filter member for collecting microparticles contained in the airflow generated by the airflow generating member;
With
The fixing member is composed of an upper fixing member disposed on the upper side of the nip portion and a lower fixing member disposed on the lower side,
The additional member is a roller member that contacts the upper fixing member and faces a conveyance path on the downstream side in the conveyance direction of the nip portion;
It is characterized by .
An image forming apparatus according to another embodiment of the present invention includes:
In an electrophotographic image forming apparatus in which toner transferred onto a recording medium is fixed by a fixing device.
A fixing member that forms a nip portion that constitutes a part of a conveyance path through which the recording medium is conveyed;
An additional member disposed on the downstream side in the conveyance direction of the nip portion;
A microparticle collection space formed by at least the fixing member and the additional member;
An air flow generating member that causes the air in the microparticle collection space to flow in a predetermined direction;
A filter member for collecting microparticles contained in the airflow generated by the airflow generating member;
With
The fixing member is composed of an upper fixing member disposed on the upper side of the nip portion and a lower fixing member disposed on the lower side,
The additional member includes a first roller member facing a conveyance path on the downstream side in the conveyance direction of the nip portion, and a second roller member in contact with the first roller member and the upper fixing member.
It is characterized by.
An image forming apparatus according to still another embodiment of the present invention is provided.
In an electrophotographic image forming apparatus in which toner transferred onto a recording medium is fixed by a fixing device.
A fixing member that forms a nip portion that constitutes a part of a conveyance path through which the recording medium is conveyed;
An additional member disposed on the downstream side in the conveyance direction of the nip portion;
A microparticle collection space formed by at least the fixing member and the additional member;
An air flow generating member that causes the air in the microparticle collection space to flow in a predetermined direction;
A filter member for collecting fine particles contained in the air flow generated by the air flow generating member;
With
The fixing member is composed of an upper fixing member disposed on the upper side of the nip portion and a lower fixing member disposed on the lower side,
The additional member includes a roller member that forms a second nip that is in contact with the lower fixing member and forms a part of a conveyance path, and a belt member that is stretched endlessly at least on the upper fixing member and the roller member And consist of
The fine particle collection space is formed by the lower fixing member and the belt member between the nip portion and the second nip portion;
It is characterized by.

前記画像形成装置においては、ニップ部の搬送方向下流側に配置された追加部材とニップ部を形成する定着部材とで微小粒子捕集空間を形成し、この空間に空気を流すことにより、微小粒子を含む空気をフィルタ部材に送り込む。つまり、ニップ部の搬送方向下流側では過熱されたトナーから微小粒子が多数発生するが、これらの微小粒子は捕集空間からスムーズにフィルタ部材に送り込まれる。   In the image forming apparatus, a fine particle collecting space is formed by an additional member disposed on the downstream side in the conveyance direction of the nip portion and a fixing member that forms the nip portion, and air is allowed to flow into this space, whereby fine particles are Is sent to the filter member. That is, many fine particles are generated from the overheated toner on the downstream side in the transport direction of the nip portion, but these fine particles are smoothly fed into the filter member from the collection space.

本発明によれば、定着ニップ部で発生する微小粒子が外部に飛散することを極力抑制して捕集することができる。   According to the present invention, the fine particles generated at the fixing nip portion can be collected while suppressing the scattering to the outside as much as possible.

第１実施例画像形成装置の要部を示す概略構成図である。1 is a schematic configuration diagram illustrating a main part of an image forming apparatus according to a first embodiment. 第２実施例である画像形成装置の要部を示す概略構成図である。It is a schematic block diagram which shows the principal part of the image forming apparatus which is 2nd Example. 第３実施例である画像形成装置の要部を示す概略構成図である。It is a schematic block diagram which shows the principal part of the image forming apparatus which is 3rd Example.

以下、本発明に係る画像形成装置の実施例について、添付図面を参照して説明する。なお、各図において同じ部材、部分には共通する符号を付し、重複する説明は省略する。   Embodiments of an image forming apparatus according to the present invention will be described below with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same member and part in each figure, and the overlapping description is abbreviate | omitted.

（第１実施例、図１参照）
第１実施例である画像形成装置は、図１に示すように、記録媒体の搬送路１（点線で示す）の搬送方向Ｚに沿って、未定着画像形成装置１０、定着装置２０、排気装置３０を配置したものである。 (See the first embodiment, FIG. 1)
As shown in FIG. 1, the image forming apparatus according to the first embodiment includes an unfixed image forming apparatus 10, a fixing apparatus 20, and an exhaust apparatus along a conveyance direction Z of a recording medium conveyance path 1 (indicated by a dotted line). 30 is arranged.

未定着画像形成装置１０は、矢印Ａ方向に回転駆動されるドラム上感光体１１の周囲に、帯電器１２、画像露光器１３、現像器１４、転写器１５、クリーナ１６などが配置されている。感光体１１は、矢印Ａ方向への回転に伴って、帯電器１２からの放電にて所定の電位に帯電され、画像露光器１３から放射される光を受け、静電潜像が形成される。この静電潜像は現像器１４にてトナー像とされる。記録媒体は、図示しない給紙装置から１枚ずつ給紙され、搬送ローラ２によって矢印Ｚ方向に搬送され、転写器１５から付与される電界により前記トナー像が転写され、未定着のトナー像を上面に保持した状態で定着装置２０に送り込まれる。また、感光体１１上の残留トナーはクリーナ１６にて払拭、回収される。   In the unfixed image forming apparatus 10, a charger 12, an image exposure device 13, a developing device 14, a transfer device 15, a cleaner 16, and the like are arranged around a drum photoreceptor 11 that is rotationally driven in the direction of arrow A. . As the photoconductor 11 rotates in the direction of arrow A, the photoconductor 11 is charged to a predetermined potential by the discharge from the charger 12 and receives light emitted from the image exposure device 13 to form an electrostatic latent image. . This electrostatic latent image is converted into a toner image by the developing device 14. The recording medium is fed one by one from a sheet feeding device (not shown), conveyed in the direction of arrow Z by the conveying roller 2, and the toner image is transferred by an electric field applied from the transfer unit 15, and an unfixed toner image is obtained. It is sent to the fixing device 20 while being held on the upper surface. Further, the residual toner on the photoconductor 11 is wiped and collected by the cleaner 16.

以上説明した画像形成プロセスは電子写真方式として周知のものである。帯電器１２は、コロナ放電によるもの以外に、ローラ方式、ブレード方式、ブラシ方式など種々のものを使用できる。画像露光器１３は、光源としてＬＥＤ、発光ダイオードなどを用いて、画像データに基づいて変調された光で感光体１１の表面を走査し、静電潜像を形成する。現像器１４は、キャリアと混合攪拌されたトナーを感光体１１の表面に供給するもので、トナーのみの１成分方式によるもの、その他種々の現像方式によるものを使用することができる。   The image forming process described above is well known as an electrophotographic system. The charger 12 can use various devices such as a roller method, a blade method, and a brush method in addition to those using corona discharge. The image exposure unit 13 uses an LED, a light emitting diode, or the like as a light source, scans the surface of the photoconductor 11 with light modulated based on image data, and forms an electrostatic latent image. The developing device 14 supplies toner mixed and stirred with a carrier to the surface of the photoconductor 11, and a toner-only one-component system or other various developing systems can be used.

トナーは、平均粒径が１〜１０μｍのものを好適に使用でき（電界に対する応答性などの観点から６μｍ程度が最も好ましい）、円形度が０．８以上の球状であるのが好ましい。トナーの帯電量は、絶対値で１０〜５０μＣ／ｇの範囲にあることが好ましく、電界応答性などの観点から絶対値で３０μＣ／ｇ程度が最も好ましい。トナーの帯電量は、トナーとキャリアとの混合比率を変えることによって制御できる。このようなトナーが加熱され、一部が溶融、揮発したときに、主成分が炭化水素のガスや微粒子となる。   A toner having an average particle diameter of 1 to 10 μm can be suitably used (about 6 μm is most preferable from the viewpoint of responsiveness to an electric field), and the toner preferably has a roundness of 0.8 or more. The toner charge amount is preferably in the range of 10 to 50 μC / g in terms of absolute value, and most preferably about 30 μC / g in terms of electric field response. The charge amount of the toner can be controlled by changing the mixing ratio of the toner and the carrier. When such toner is heated and partially melted and volatilized, the main component becomes hydrocarbon gas or fine particles.

転写器１５は、転写バイアス（１００〜１０００Ｖ程度）を印加可能なローラ部材が用いられ、ローラ部材の表面材料にはゴム材、ソリッド材、発泡材などで被覆されている。クリーナ１６は、感光体１１の表面から残留トナーをブレード部材によって掻き取る方式が用いられ、それ以外に、バイアスを印加したクリーニング部材によって静電的に払拭する方式などを使用できる。クリーナ１６の材料としては、ソリッド材、ブラシ、発泡材、ウェブ材などである。   The transfer device 15 is a roller member to which a transfer bias (about 100 to 1000 V) can be applied, and the surface material of the roller member is covered with a rubber material, a solid material, a foam material, or the like. The cleaner 16 uses a method of scraping residual toner from the surface of the photoconductor 11 with a blade member. In addition, a method of electrostatically wiping with a cleaning member to which a bias is applied can be used. The material of the cleaner 16 is a solid material, a brush, a foam material, a web material, or the like.

定着装置２０は、熱源としてのハロゲンランプ２２を内蔵した上側定着ローラ２１と下側定着ローラ２３と、追加ローラ２４とを備えている。熱源としては、ハロゲンランプ２２以外に、ＩＨヒータ、マイクロ波ヒータなどであってもよい。上側定着ローラ２１は、弾性材からなり、矢印Ｂ方向に回転駆動され、下側定着ローラ２３が所定の圧力で下方から圧接することにより、若干食込まれている。また、下側定着ローラ２３は上側定着ローラ２１の回転に伴って従動回転する。ローラ２１，２３の圧接部分が定着ニップ部として作用する。記録媒体がトナー像転写面を上方に向けてこのニップ部を搬送される際、トナーは熱溶融及び圧縮、固着、固化される。トナーの固化は、自然冷却や空気流の吹き付けであってもよく、冷却部材を記録媒体の表面に近接あるいは当接させて行うようにしてもよい。この加熱定着時にトナーから微小粒子が放出され、放出される箇所は、定着ニップ部の搬送方向下流側である。   The fixing device 20 includes an upper fixing roller 21 having a built-in halogen lamp 22 as a heat source, a lower fixing roller 23, and an additional roller 24. As a heat source, in addition to the halogen lamp 22, an IH heater, a microwave heater, or the like may be used. The upper fixing roller 21 is made of an elastic material, and is driven to rotate in the direction of arrow B. The lower fixing roller 23 is slightly bitten by being pressed from below with a predetermined pressure. Further, the lower fixing roller 23 is driven to rotate as the upper fixing roller 21 rotates. The pressure contact portions of the rollers 21 and 23 act as a fixing nip portion. When the recording medium is conveyed through the nip portion with the toner image transfer surface facing upward, the toner is melted and compressed, fixed, and solidified. The solidification of the toner may be natural cooling or airflow spraying, or may be performed by bringing the cooling member close to or in contact with the surface of the recording medium. During the heat fixing, fine particles are discharged from the toner, and the discharged portion is downstream in the transport direction of the fixing nip portion.

追加ローラ２４は、定着ニップ部の搬送方向下流側に配置され、上側定着ローラ２１に接して従動回転するとともに、ニップ部の搬送方向下流側の搬送路１に臨んでいる。追加ローラ２４としては、表面にスポンジなどの弾性材を用いたり、ウェブを用いてもよく、金属ローラであってもよい。また、追加ローラ２４の外周面に近接して温度調整部材２５を配置することが好ましい。温度調整部材２５は、例えば冷却ファンであって、追加ローラ２４の温度を少なくとも定着ニップ部の温度よりも低温に調整する。追加ローラ２４は、定着ローラ２２，２３を介して加熱されるので、追加ローラ２４に記録媒体上のトナーが接触すると、追加ローラ２４の熱によってトナー画像が乱れたり、画像の光沢が不必要に増してしまう。それゆえ、追加ローラ２４の温度を少なくとも定着ニップ部の温度よりも低温に調整することが好ましい。   The additional roller 24 is disposed on the downstream side in the conveyance direction of the fixing nip portion, contacts and rotates with the upper fixing roller 21, and faces the conveyance path 1 on the downstream side in the conveyance direction of the nip portion. As the additional roller 24, an elastic material such as sponge may be used on the surface, a web may be used, or a metal roller may be used. Further, it is preferable that the temperature adjusting member 25 is disposed in the vicinity of the outer peripheral surface of the additional roller 24. The temperature adjustment member 25 is, for example, a cooling fan, and adjusts the temperature of the additional roller 24 at least lower than the temperature of the fixing nip portion. Since the additional roller 24 is heated via the fixing rollers 22 and 23, when the toner on the recording medium comes into contact with the additional roller 24, the toner image is disturbed by the heat of the additional roller 24, and the gloss of the image is unnecessary. It will increase. Therefore, it is preferable to adjust the temperature of the additional roller 24 at least lower than the temperature of the fixing nip portion.

以上の構成からなる定着装置２０においては、定着ニップ部を記録媒体が搬送されるとき、上側定着ローラ２１と追加ローラ２４と搬送される記録媒体によって微小粒子捕集空間Ｓ（図１の拡大部分にクロスハッチングを付して示す部分）が形成される。つまり、加熱溶融されたトナーから発生する微小粒子はこの空間Ｓに捕集されることになる。   In the fixing device 20 having the above configuration, when the recording medium is conveyed through the fixing nip portion, the fine particle collecting space S (an enlarged portion of FIG. 1) is conveyed by the recording medium conveyed with the upper fixing roller 21 and the additional roller 24. Are formed with cross-hatching. That is, fine particles generated from the heat-melted toner are collected in the space S.

さらに、定着装置２０には、空気流発生部材２６が捕集空間Ｓの端部（搬送方向Ｚと直交する方向かつ図１の紙面に垂直方向“回転部材軸方向”の端部）に配置されている。空気流発生部材２６はダイヤフラム式、ベローズ式、電磁式、ピトン式などのポンプ型のものを用いることができ、ファン型であってもよい。空気流発生部材２６によって微小粒子を含む捕集空間Ｓの空気が所定の方向、即ち、搬送方向Ｚと直交する方向かつ紙面垂直方向に流動し、以下に詳述する排気装置３０に送り込まれる。   Further, in the fixing device 20, the air flow generating member 26 is arranged at the end of the collection space S (the end in the direction perpendicular to the transport direction Z and the direction “rotating member axial direction” perpendicular to the paper surface of FIG. 1). ing. The air flow generating member 26 may be a pump type such as a diaphragm type, a bellows type, an electromagnetic type, or a pitton type, and may be a fan type. The air flow generating member 26 causes the air in the collection space S containing fine particles to flow in a predetermined direction, that is, a direction orthogonal to the transport direction Z and a direction perpendicular to the paper surface, and is sent to the exhaust device 30 described in detail below.

排気装置３０は、筐体３１に内蔵された空気流発生部材３２とフィルタ部材３３とで構成されており、筐体３１の開口部３１ａに配置されたダクト（図示せず）は前記微小粒子捕集空間Ｓの搬送方向Ｚと直交する方向かつ紙面垂直方向の端部に臨んでいる。なお、筐体３１の開口部３１ａが捕集空間Ｓの端部に直接的に臨んでいてもよい。   The exhaust device 30 includes an air flow generating member 32 and a filter member 33 incorporated in the housing 31, and a duct (not shown) disposed in the opening 31 a of the housing 31 captures the fine particles. It faces the end of the collecting space S in the direction perpendicular to the transport direction Z and in the direction perpendicular to the paper surface. Note that the opening 31 a of the housing 31 may face the end of the collection space S directly.

この排気装置３０は画像形成装置の内部の全体的な排気を行うものであるが、特に、捕集空間Ｓの排気をも行う。即ち、空気流発生部材２６によって、捕集空間Ｓの空気は搬送方向Ｚと直交する方向かつ紙面垂直方向に流動する。捕集空間Ｓ内の空気は、排気装置３０に設けた空気流発生部材３２の作用によっても、図示しないダクトを通じて排気装置３０に送り込まれ、微小粒子がフィルタ部材３３によって捕捉される。   The exhaust device 30 exhausts the entire interior of the image forming apparatus, and in particular exhausts the collection space S. That is, the air flow generating member 26 causes the air in the collection space S to flow in a direction perpendicular to the transport direction Z and in a direction perpendicular to the paper surface. The air in the collection space S is also sent to the exhaust device 30 through a duct (not shown) by the action of the air flow generating member 32 provided in the exhaust device 30, and the fine particles are captured by the filter member 33.

空気流発生部材３２としては、ダイヤフラム式、ベローズ式、電磁式、ピトン式などのポンプ型のものを用いることができ、ファン型であってもよい。なお、捕集空間Ｓ内の空気を一方向に流動させてフィルタ部材３３に送り込むのに空気流発生部材２６の作用だけで十分であれば、微小粒子の捕捉手段としての空気流発生部材３２は必ずしも必要なものではない。   As the air flow generating member 32, a pump type such as a diaphragm type, a bellows type, an electromagnetic type and a pitton type can be used, and a fan type may be used. In addition, if only the action of the air flow generating member 26 is sufficient to cause the air in the collection space S to flow in one direction and send it to the filter member 33, the air flow generating member 32 as a microparticle capturing means is It is not always necessary.

フィルタ部材３３としては、ＶＯＣやＵＦＰなどの微小粒子を高効率で捕捉可能な静電フィルタを使用することが望ましい。微小粒子を捕捉可能であれば、微小粒子を帯電させて補足する静電フィルタでなくてもよく、粘着性フィルタ、活性炭フィルタなどであってもよい。フィルタの構成としては、不織布型やハニカム型を好適に用いることができる。   As the filter member 33, it is desirable to use an electrostatic filter that can capture fine particles such as VOC and UFP with high efficiency. As long as microparticles can be captured, the filter may not be an electrostatic filter that charges and captures microparticles, but may be an adhesive filter, an activated carbon filter, or the like. As the configuration of the filter, a nonwoven fabric type or a honeycomb type can be suitably used.

さらに、定着装置２０には、定着ニップ部の搬送方向下流側の搬送路１であって追加ローラ２４とは反対側にガイド部材２７を配置してもよい。ガイド部材２７は搬送路１に対向する面が樹脂材で被覆されていることが好ましい。このガイド部材２７は少なくとも搬送可能な最小サイズの記録媒体の幅よりも大きい幅を有している。小さなサイズの記録媒体が搬送される場合、前記捕集空間Ｓの下部に隙間が生じ、空間Ｓの空気流動性が低下する。ガイド部材２７を配置することによって、空間Ｓの閉鎖性を維持できる。   Further, in the fixing device 20, a guide member 27 may be disposed on the conveyance path 1 on the downstream side in the conveyance direction of the fixing nip portion and on the side opposite to the additional roller 24. The guide member 27 is preferably coated with a resin material on the surface facing the conveyance path 1. The guide member 27 has a width that is at least larger than the width of the smallest size recording medium that can be conveyed. When a recording medium of a small size is conveyed, a gap is generated in the lower part of the collection space S, and the air fluidity of the space S is lowered. By disposing the guide member 27, the closing property of the space S can be maintained.

（第２実施例、図２参照）
第２実施例である画像形成装置は、基本的には前記第１実施例と同様の定着装置２０を備え、異なる点は、図２に示すように、微小粒子捕集空間Ｓを形成する追加部材を、第１追加ローラ２４ａと第２追加ローラ２４ｂとで構成したものである。第１追加ローラ２４ａは定着ニップ部の搬送方向下流側の搬送路１に臨む。第２追加ローラ２４ｂは第１追加ローラ２４ａ及び上側定着ローラ２１に接している。 (See the second embodiment, FIG. 2)
The image forming apparatus according to the second embodiment basically includes a fixing device 20 similar to that of the first embodiment, except that an addition of forming a microparticle collection space S as shown in FIG. The member is composed of a first additional roller 24a and a second additional roller 24b. The first additional roller 24a faces the conveyance path 1 on the downstream side in the conveyance direction of the fixing nip portion. The second additional roller 24 b is in contact with the first additional roller 24 a and the upper fixing roller 21.

本第２実施例において、定着ニップ部を記録媒体が搬送されるとき、上側定着ローラ２１と追加ローラ２４ａ，２４ｂと搬送される記録媒体によって微小粒子捕集空間Ｓ（図２にクロスハッチングを付して示す部分）が形成される。この空間Ｓに捕集された微小粒子が、前記第１実施例と同様に、最終的に、排気装置３０のフィルタ部材３３に捕捉される。従って、本第２実施例での作用効果は基本的には前記第１実施例と同様である。   In the second embodiment, when the recording medium is conveyed through the fixing nip portion, the fine particle collecting space S (cross hatching is added to FIG. 2) by the recording medium conveyed with the upper fixing roller 21 and the additional rollers 24a and 24b. Part) is formed. The fine particles collected in the space S are finally captured by the filter member 33 of the exhaust device 30 as in the first embodiment. Accordingly, the operational effects of the second embodiment are basically the same as those of the first embodiment.

（第３実施例、図３参照）
第３実施例である画像形成装置は、図３に示す定着装置２０を備えている。この定着装置２０は、上側定着ローラ２１に対して下側定着ローラ２３を搬送方向Ｚの下流側に若干ずらせて配置している。追加部材としては、下側定着ローラ２３に接して搬送路１の一部を構成する追加ローラ２４ｃと、少なくとも上側定着ローラ２１と追加ローラ２４ｃに無端状に張架された追加ベルト２８とで構成されている。追加ベルト２８は、弾性材からなり、上定着ローラ２１の回転に伴って矢印ｂ方向にエンドレスに従動回転するように保持ローラ２８ａ，２８ｂが配置されている。 (Refer to the third embodiment, FIG. 3)
The image forming apparatus according to the third embodiment includes a fixing device 20 shown in FIG. In the fixing device 20, the lower fixing roller 23 is slightly shifted from the upper fixing roller 21 on the downstream side in the transport direction Z. The additional member includes an additional roller 24c that forms part of the conveyance path 1 in contact with the lower fixing roller 23, and an additional belt 28 that is stretched endlessly at least on the upper fixing roller 21 and the additional roller 24c. Has been. The additional belt 28 is made of an elastic material, and holding rollers 28 a and 28 b are disposed so as to be driven endlessly in the direction of arrow b as the upper fixing roller 21 rotates.

詳しくは、追加ベルト２８は、上側定着ローラ２１の外周面下部から下側定着ローラ２３の外周面上部を通じて追加ローラ２４ｃに巻き付けられており、追加ローラ２４ｃの回転を若干遅らせることで、下側定着ローラ２３の直上で弛みを生じる。ベルト２８のこの弛み部分と下側定着ローラ２３とで微小粒子捕集空間Ｓ（図３にクロスハッチングを付して示す部分）が形成される。   Specifically, the additional belt 28 is wound around the additional roller 24c from the lower outer peripheral surface of the upper fixing roller 21 through the upper outer peripheral surface of the lower fixing roller 23, and the lower fixing is achieved by slightly delaying the rotation of the additional roller 24c. A slack is generated immediately above the roller 23. The slack portion of the belt 28 and the lower fixing roller 23 form a fine particle collection space S (portion shown with cross-hatching in FIG. 3).

記録媒体は図３に点線で示す搬送路１を矢印Ｚ方向に搬送され、定着ローラ２１，２３のニップ部を通過する際にトナーが熱溶融及び圧縮、固着、固化される。さらに、記録媒体は下側定着ローラ２３の上面部分に沿って搬送され、下側定着ローラ２３と追加ローラ２４ｃとで形成される第２ニップ部から送り出される。従って、本第３実施例において、微小粒子捕集空間Ｓは、ローラ２１，２３で形成される定着ニップ部とローラ２３，２４ｃで形成される第２ニップ部との間であって、下側定着ローラ２３と追加ベルト２８とで形成されることになる。   The recording medium is conveyed in the direction of arrow Z along the conveyance path 1 indicated by a dotted line in FIG. 3, and the toner is thermally melted, compressed, fixed, and solidified as it passes through the nip portion of the fixing rollers 21 and 23. Further, the recording medium is conveyed along the upper surface portion of the lower fixing roller 23 and sent out from the second nip portion formed by the lower fixing roller 23 and the additional roller 24c. Therefore, in the third embodiment, the fine particle collecting space S is between the fixing nip portion formed by the rollers 21 and 23 and the second nip portion formed by the rollers 23 and 24c, and the lower side. The fixing roller 23 and the additional belt 28 are formed.

本第３実施例においても、捕集空間Ｓに捕集された微小粒子が、前記第１実施例と同様に、最終的に、排気装置３０のフィルタ部材３３に捕捉される。従って、本第３実施例での作用効果は基本的には前記第１実施例と同様である。   Also in the third embodiment, the fine particles collected in the collection space S are finally captured by the filter member 33 of the exhaust device 30 as in the first embodiment. Therefore, the operational effects of the third embodiment are basically the same as those of the first embodiment.

（種々の実験例）
以下に、前記第１、第２及び第３実施例のそれぞれを使用した実験例１〜５を比較例との参照のうえで説明する。 (Various experimental examples)
Hereinafter, Experimental Examples 1 to 5 using the first, second, and third examples will be described with reference to comparative examples.

（実験例１）
図１に示した第１実施例を用いて以下に示す条件にて捕集粒子量を測定した。なお、温度調整部材２５及びガイド部材２７は設けられていない。
未定着画像形成装置：モノクロ直接転写方式
記録媒体：普通紙（幅寸法２９７ｍｍ）
上側定着ローラ：外径６０ｍｍの中空弾性ローラ
下側定着ローラ：外径６０ｍｍの弾性ローラ
熱源：ハロゲンランプ
追加部材：外径３０ｍｍの弾性ローラ
空気流発生部材：ファン方式
排気装置：ファン方式
補修対象：ＵＦＰ
測定器：ＵＦＰパーティクルカウンタ、排気装置においてフィルタ部材に代えて測定器を設置し、捕集されてきた粒子数をカウントする。 (Experimental example 1)
Using the first embodiment shown in FIG. 1, the amount of collected particles was measured under the following conditions. The temperature adjusting member 25 and the guide member 27 are not provided.
Unfixed image forming apparatus: Monochrome direct transfer system Recording medium: Plain paper (width dimension 297 mm)
Upper fixing roller: hollow elastic roller having an outer diameter of 60 mm Lower fixing roller: elastic roller having an outer diameter of 60 mm Heat source: halogen lamp Additional member: elastic roller having an outer diameter of 30 mm Air flow generating member: fan method Exhaust device: fan method Repair target: UFP
Measuring instrument: A UFP particle counter, a measuring instrument is installed instead of the filter member in the exhaust device, and the number of particles collected is counted.

以上の実験例１において、ＵＦＰの捕集粒子量（×１０2個／ｍＬ）は、表１に示すように２８０であった。比較例１として、定着装置が同じ構成で、追加ローラ２４がなく、定着ニップ部の端部に排気装置３０に設けたダクトを配置させたものでの捕集粒子量は１５０であった。比較例１のようにダクトを配置するのみではダクトの入口部でのＵＦＰの漏れ量が多く、実験例１では大量のＵＦＰを捕集できた。 In Experimental Example 1 described above, the amount of collected UFP particles (× 10 2 particles / mL) was 280 as shown in Table 1. As Comparative Example 1, the amount of collected particles was 150 when the fixing device had the same configuration, the additional roller 24 was not provided, and the duct provided in the exhaust device 30 was disposed at the end of the fixing nip portion. If only the duct was arranged as in Comparative Example 1, the amount of UFP leaked at the inlet of the duct was large, and in Experimental Example 1, a large amount of UFP could be collected.

Figure 0006402385
Figure 0006402385

（実験例２）
図２に示した第２実施例を用いて以下に示す条件にて捕集粒子量を測定した。
未定着画像形成装置：モノクロ直接転写方式
記録媒体：普通紙（幅寸法２９７ｍｍ）
上側定着ローラ：外径６０ｍｍの中空弾性ローラ
下側定着ローラ：外径６０ｍｍの弾性ローラ
熱源：ハロゲンランプ
追加部材（第１ローラ）：外径３０ｍｍの弾性ローラ
追加部材（第２ローラ）：外径３０ｍｍの弾性ローラ
空気流発生部材：ファン方式
排気装置：ファン方式
補修対象：ＵＦＰ
測定器：ＵＦＰパーティクルカウンタ、排気装置においてフィルタ部材に代えて測定器を設置し、捕集されてきた粒子数をカウントする。 (Experimental example 2)
The amount of collected particles was measured under the following conditions using the second embodiment shown in FIG.
Unfixed image forming apparatus: Monochrome direct transfer system Recording medium: Plain paper (width dimension 297 mm)
Upper fixing roller: hollow elastic roller having an outer diameter of 60 mm Lower fixing roller: elastic roller having an outer diameter of 60 mm Heat source: halogen lamp Additional member (first roller): elastic roller having an outer diameter of 30 mm Additional member (second roller): outer diameter 30mm elastic roller Air flow generating member: Fan system Exhaust device: Fan system Repair target: UFP
Measuring instrument: A UFP particle counter, a measuring instrument is installed instead of the filter member in the exhaust device, and the number of particles collected is counted.

以上の実験例２において、ＵＦＰの捕集粒子量（×１０2個／ｍＬ）は、表２に示すように２８０であった。前記実験例１と比較すると、捕集粒子量は同じであるが、紙詰まりの発生比率は１／１０に低下した。実験例１では追加ローラ２４が記録媒体との近接部分で搬送方向Ｚに対して逆方向に回転して紙詰まりの原因となることがある。これに対して、実験例２では第１追加ローラ２４ａが記録媒体との近接部分で搬送方向Ｚと同じ方向に回転するので、紙詰まりが発生し難くなる。 In Experimental Example 2 described above, the amount of collected UFP particles (× 10 2 particles / mL) was 280 as shown in Table 2. Compared with Experimental Example 1, the amount of collected particles was the same, but the occurrence ratio of paper jam was reduced to 1/10. In Experimental Example 1, the additional roller 24 may rotate in the reverse direction with respect to the transport direction Z in the vicinity of the recording medium, causing a paper jam. On the other hand, in Experimental Example 2, the first additional roller 24a rotates in the same direction as the transport direction Z in the vicinity of the recording medium, so that it is difficult for paper jam to occur.

Figure 0006402385
Figure 0006402385

（実験例３）
図３に示した第３実施例を用いて以下に示す条件にて捕集粒子量を測定した。
未定着画像形成装置：モノクロ直接転写方式
記録媒体：普通紙（幅寸法２９７ｍｍ）
上側定着ローラ：外径６０ｍｍの中空弾性ローラ
下側定着ローラ：外径６０ｍｍの弾性ローラ
熱源：ハロゲンランプ
追加部材：弾性ベルト
：外径３０ｍｍの弾性ローラ（２４ｃ）
空気流発生部材：ファン方式
排気装置：ファン方式
補修対象：ＵＦＰ
測定器：ＵＦＰパーティクルカウンタ、排気装置においてフィルタ部材に代えて測定器を設置し、捕集されてきた粒子数をカウントする。 (Experimental example 3)
Using the third embodiment shown in FIG. 3, the amount of collected particles was measured under the following conditions.
Unfixed image forming apparatus: Monochrome direct transfer system Recording medium: Plain paper (width dimension 297 mm)
Upper fixing roller: hollow elastic roller having an outer diameter of 60 mm Lower fixing roller: elastic roller having an outer diameter of 60 mm Heat source: halogen lamp Additional member: elastic belt
: Elastic roller (24c) having an outer diameter of 30 mm
Air flow generating member: Fan method Exhaust device: Fan method Repair target: UFP
Measuring instrument: A UFP particle counter, a measuring instrument is installed instead of the filter member in the exhaust device, and the number of particles collected is counted.

以上の実験例３において、ＵＦＰの捕集粒子量（×１０2個／ｍＬ）は、表３に示すように３００であった。前記実験例１と比較すると捕集粒子量が多くなっていた。これは、実験例１よりも実験例３のほうが捕集空間Ｓの密閉性が高いためである。 In Experimental Example 3 described above, the amount of UFP collected particles (× 10 2 particles / mL) was 300 as shown in Table 3. Compared with Experimental Example 1, the amount of collected particles was large. This is because Experimental Example 3 has a higher sealing property of the collection space S than Experimental Example 1.

Figure 0006402385
Figure 0006402385

（実験例４）
図３に示した第３実施例に温度調整部材２５を設けて以下に示す条件にて捕集粒子量を測定した。なお、ガイド部材２７は設けていない。
未定着画像形成装置：モノクロ直接転写方式
記録媒体：普通紙（幅寸法２９７ｍｍ）
上側定着ローラ：外径６０ｍｍの中空弾性ローラ
下側定着ローラ：外径６０ｍｍの弾性ローラ
熱源：ハロゲンランプ
追加部材：弾性ベルト
：外径３０ｍｍの弾性ローラ（２４ｃ）
温度調整部材：ファン冷却方式（第２ニップ部の温度を１６０℃に冷却。第１ニップ部の温度は１８０℃）
空気流発生部材：ファン方式
排気装置：ファン方式
補修対象：ＵＦＰ
測定器：ＵＦＰパーティクルカウンタ、排気装置においてフィルタ部材に代えて測定器を設置し、捕集されてきた粒子数をカウントする。 (Experimental example 4)
The temperature adjusting member 25 was provided in the third embodiment shown in FIG. 3, and the amount of collected particles was measured under the following conditions. The guide member 27 is not provided.
Unfixed image forming apparatus: Monochrome direct transfer system Recording medium: Plain paper (width dimension 297 mm)
Upper fixing roller: hollow elastic roller having an outer diameter of 60 mm Lower fixing roller: elastic roller having an outer diameter of 60 mm Heat source: halogen lamp Additional member: elastic belt
: Elastic roller (24c) having an outer diameter of 30 mm
Temperature adjusting member: Fan cooling method (cooling the temperature of the second nip portion to 160 ° C. The temperature of the first nip portion is 180 ° C)
Air flow generating member: Fan method Exhaust device: Fan method Repair target: UFP
Measuring instrument: A UFP particle counter, a measuring instrument is installed instead of the filter member in the exhaust device, and the number of particles collected is counted.

以上の実験例４において、ＵＦＰの捕集粒子量（×１０2個／ｍＬ）は、表４に示すように３００であった。画像乱れ発生比率は、前記実験例１を“１”とすると、前記実験例３が１．５であったのに対して、本実験例４では０．１であった。ここで、画像乱れとは、定着ニップ部で加熱溶融されたトナーが追加部材によって再加熱されて画像の光沢が不必要に増加することをいう。前記実験例３では、記録媒体が下側定着ローラ２３と追加ローラ２４ｃとの間の第２ニップ部を通過する際に、追加ローラ２４ａで加熱されて画像乱れの発生比率が１．５に高まってしまう。これに対して、追加ローラ２４ａを温度調整部材２５で冷却することにより、画像乱れの発生比率が０．１にまで低下した。 In Experimental Example 4 described above, the amount of UFP collected particles (× 10 2 particles / mL) was 300 as shown in Table 4. When the experimental example 1 is set to “1”, the image disturbance occurrence ratio is 1.5 in the experimental example 3, whereas it is 0.1 in the present experimental example 4. Here, the image disturbance means that the toner heated and melted in the fixing nip is reheated by the additional member and the gloss of the image is unnecessarily increased. In Experimental Example 3, when the recording medium passes through the second nip portion between the lower fixing roller 23 and the additional roller 24c, the recording roller is heated by the additional roller 24a, and the image distortion occurrence ratio increases to 1.5. End up. On the other hand, when the additional roller 24a is cooled by the temperature adjusting member 25, the occurrence ratio of the image disturbance is reduced to 0.1.

Figure 0006402385
Figure 0006402385

（実験例５）
図１に示した第１実施例にガイド部材２７を設けて以下に示す条件にて捕集粒子量を測定した。なお、温度調整部材２５は設けていない。
未定着画像形成装置：モノクロ直接転写方式
記録媒体：普通紙（幅寸法１５０ｍｍ）
上側定着ローラ：外径６０ｍｍの中空弾性ローラ
下側定着ローラ：外径６０ｍｍの弾性ローラ
熱源：ハロゲンランプ
追加部材：外径３０ｍｍの弾性ローラ
ガイド部材：幅３００ｍｍ
空気流発生部材：ファン方式
排気装置：ファン方式
補修対象：ＵＦＰ
測定器：ＵＦＰパーティクルカウンタ、排気装置においてフィルタ部材に代えて測定器を設置し、捕集されてきた粒子数をカウントする。 (Experimental example 5)
The guide member 27 was provided in the first embodiment shown in FIG. 1, and the amount of collected particles was measured under the following conditions. The temperature adjustment member 25 is not provided.
Unfixed image forming apparatus: Monochrome direct transfer system Recording medium: Plain paper (width size 150 mm)
Upper fixing roller: hollow elastic roller having an outer diameter of 60 mm Lower fixing roller: elastic roller having an outer diameter of 60 mm Heat source: halogen lamp Additional member: elastic roller having an outer diameter of 30 mm Guide member: width of 300 mm
Air flow generating member: Fan method Exhaust device: Fan method Repair target: UFP
Measuring instrument: A UFP particle counter, a measuring instrument is installed instead of the filter member in the exhaust device, and the number of particles collected is counted.

以上の実験例５において、ＵＦＰの捕集粒子量（×１０2個／ｍＬ）は、表５に示すように２５０であった。前記実験例１のように幅寸法が２９７ｍｍの記録媒体を搬送した場合の捕集粒子量２８０よりも若干低下する程度である。一方、ガイド部材２７を設けることなく幅１５０ｍｍの記録媒体を搬送した比較例２では捕集粒子量は１２０であり、本実験例５のようにガイド部材２７を設けることにより、幅の小さい記録媒体を搬送する際の捕集粒子量の減少が抑制される。 In Experimental Example 5 described above, the amount of collected UFP particles (× 10 2 particles / mL) was 250 as shown in Table 5. As in Experimental Example 1, the amount is slightly lower than the amount of collected particles 280 when a recording medium having a width of 297 mm is conveyed. On the other hand, in Comparative Example 2 in which a recording medium having a width of 150 mm is conveyed without providing the guide member 27, the amount of collected particles is 120. By providing the guide member 27 as in Experimental Example 5, a recording medium having a small width is provided. A decrease in the amount of collected particles when conveying the is suppressed.

Figure 0006402385
Figure 0006402385

（他の実施例）
なお、本発明に係る、画像形成装置は前記実施例に限定するものではなく、その要旨の範囲内で種々に変更することができる。 (Other examples)
The image forming apparatus according to the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the gist thereof.

特に、画像形成装置としては、プリント機能のみを備えたもの以外に、通信機能やファクシミリ機能などを備えた複合機であってもよい。また、モノクロ機以外に、カラー機であってもよく、カラー機としてはタンデム方式が一般的である。   In particular, the image forming apparatus may be a multifunction machine having a communication function, a facsimile function, and the like in addition to a printer having only a print function. In addition to a monochrome machine, a color machine may be used, and a tandem system is generally used as a color machine.

さらに、前記実施例として示した、未定着画像形成装置１０、定着装置２０、排気装置３０の細部の構造、各種機器の方式、材料などは任意である。   Further, the detailed structures of the unfixed image forming apparatus 10, the fixing apparatus 20, and the exhaust apparatus 30 shown in the above-described embodiment, the types of various devices, materials, and the like are arbitrary.

以上のように、本発明は、画像形成装置に有用であり、特に、定着ニップ部で発生する微小粒子が外部に飛散することを極力抑制して捕集できる点で優れている。   As described above, the present invention is useful for an image forming apparatus, and is particularly excellent in that it can be collected while suppressing as much as possible fine particles generated in the fixing nip portion from being scattered outside.

１…搬送路
１０…未定着画像形成装置
２０…定着装置
２１…上側定着ローラ
２３…下側定着ローラ
２４，２４ａ，２４ｂ，２４ｃ…追加ローラ
２５…温度調整部材
２６…空気流発生部材
２７…ガイド部材
２８…追加ベルト
３０…排気装置
３２…空気流発生部材
３３…フィルタ部材
Ｓ…微小粒子捕集空間 DESCRIPTION OF SYMBOLS 1 ... Conveyance path 10 ... Unfixed image forming apparatus 20 ... Fixing apparatus 21 ... Upper side fixing roller 23 ... Lower side fixing roller 24, 24a, 24b, 24c ... Additional roller 25 ... Temperature adjusting member 26 ... Air flow generating member 27 ... Guide Member 28 ... Additional belt 30 ... Exhaust device 32 ... Air flow generating member 33 ... Filter member S ... Space for collecting fine particles

Claims (5)

記録媒体上に転写されたトナーを定着装置で定着させる、電子写真方式による画像形成装置において、
記録媒体が搬送される搬送路の一部を構成するニップ部を形成する定着部材と、
前記ニップ部の搬送方向下流側に配置された追加部材と、
少なくとも前記定着部材と前記追加部材とで形成される微小粒子捕集空間と、
前記微小粒子捕集空間の空気を所定の方向に流動させる空気流発生部材と、
前記空気流発生部材によって生じた空気流中に含まれる微小粒子を捕集するフィルタ部材と、
を備え、
前記定着部材は、前記ニップ部の上側に配置された上側定着部材と、下側に配置された下側定着部材とからなり、
前記追加部材は前記上側定着部材に接するとともに前記ニップ部の搬送方向下流側の搬送路に臨む一つのローラ部材からなること、
を特徴とする画像形成装置。 In an electrophotographic image forming apparatus in which toner transferred onto a recording medium is fixed by a fixing device.
A fixing member that forms a nip portion that constitutes a part of a conveyance path through which the recording medium is conveyed;
An additional member disposed on the downstream side in the conveyance direction of the nip portion;
A microparticle collection space formed by at least the fixing member and the additional member;
An air flow generating member that causes the air in the microparticle collection space to flow in a predetermined direction;
A filter member for collecting microparticles contained in the airflow generated by the airflow generating member;
With
The fixing member is composed of an upper fixing member disposed on the upper side of the nip portion and a lower fixing member disposed on the lower side,
The additional member is a roller member that contacts the upper fixing member and faces a conveyance path on the downstream side in the conveyance direction of the nip portion;
Images forming device you characterized. 記録媒体上に転写されたトナーを定着装置で定着させる、電子写真方式による画像形成装置において、
記録媒体が搬送される搬送路の一部を構成するニップ部を形成する定着部材と、
前記ニップ部の搬送方向下流側に配置された追加部材と、
少なくとも前記定着部材と前記追加部材とで形成される微小粒子捕集空間と、
前記微小粒子捕集空間の空気を所定の方向に流動させる空気流発生部材と、
前記空気流発生部材によって生じた空気流中に含まれる微小粒子を捕集するフィルタ部材と、
を備え、
前記定着部材は、前記ニップ部の上側に配置された上側定着部材と、下側に配置された下側定着部材とからなり、
前記追加部材は、前記ニップ部の搬送方向下流側の搬送路に臨む第１ローラ部材と、前記第１ローラ部材及び前記上側定着部材に接する第２ローラ部材とからなること、
を特徴とする画像形成装置。 In an electrophotographic image forming apparatus in which toner transferred onto a recording medium is fixed by a fixing device.
A fixing member that forms a nip portion that constitutes a part of a conveyance path through which the recording medium is conveyed;
An additional member disposed on the downstream side in the conveyance direction of the nip portion;
A microparticle collection space formed by at least the fixing member and the additional member;
An air flow generating member that causes the air in the microparticle collection space to flow in a predetermined direction;
A filter member for collecting microparticles contained in the airflow generated by the airflow generating member;
With
The fixing member is composed of an upper fixing member disposed on the upper side of the nip portion and a lower fixing member disposed on the lower side,
The additional member includes a first roller member facing a conveyance path on the downstream side in the conveyance direction of the nip portion, and a second roller member in contact with the first roller member and the upper fixing member.
Images forming device you characterized. 記録媒体上に転写されたトナーを定着装置で定着させる、電子写真方式による画像形成装置において、
記録媒体が搬送される搬送路の一部を構成するニップ部を形成する定着部材と、
前記ニップ部の搬送方向下流側に配置された追加部材と、
少なくとも前記定着部材と前記追加部材とで形成される微小粒子捕集空間と、
前記微小粒子捕集空間の空気を所定の方向に流動させる空気流発生部材と、
前記空気流発生部材によって生じた空気流中に含まれる微小粒子を捕集するフィルタ部材と、
を備え、
前記定着部材は、前記ニップ部の上側に配置された上側定着部材と、下側に配置された下側定着部材とからなり、
前記追加部材は、前記下側定着部材に接して搬送路の一部を構成する第２ニップを形成するローラ部材と、少なくとも前記上側定着部材及び前記ローラ部材に無端状に張架されたベルト部材とからなり、
前記微小粒子捕集空間は、前記ニップ部と前記第２ニップ部との間であって前記下側定着部材と前記ベルト部材とで形成されること、
を特徴とする画像形成装置。 In an electrophotographic image forming apparatus in which toner transferred onto a recording medium is fixed by a fixing device.
A fixing member that forms a nip portion that constitutes a part of a conveyance path through which the recording medium is conveyed;
An additional member disposed on the downstream side in the conveyance direction of the nip portion;
A microparticle collection space formed by at least the fixing member and the additional member;
An air flow generating member that causes the air in the microparticle collection space to flow in a predetermined direction;
A filter member for collecting microparticles contained in the airflow generated by the airflow generating member;
With
The fixing member is composed of an upper fixing member disposed on the upper side of the nip portion and a lower fixing member disposed on the lower side,
The additional member includes a roller member that forms a second nip that is in contact with the lower fixing member and forms a part of a conveyance path, and a belt member that is stretched endlessly at least on the upper fixing member and the roller member And consist of
The fine particle collection space is formed by the lower fixing member and the belt member between the nip portion and the second nip portion;
Images forming device you characterized. さらに、前記追加部材の温度を少なくとも前記ニップ部の温度よりも低温に調整する温度調整手段を備えたこと、を特徴とする請求項１または請求項２に記載の画像形成装置。 Further, the image forming apparatus according to claim 1 or claim 2, characterized in that, with a temperature adjusting means for adjusting the temperature lower than the temperature of at least the nip temperature of the additional member. さらに、前記ニップ部の搬送方向下流側の搬送路であって前記追加部材とは反対側に配置された、搬送可能な最小サイズの記録媒体の幅よりも大きい幅を有するガイド部材を備えたこと、を特徴とする請求項１または請求項２に記載の画像形成装置。 Furthermore, a guide member having a width larger than the width of the smallest transportable recording medium disposed on the transport path downstream of the nip portion in the transport direction and opposite to the additional member is provided. The image forming apparatus according to claim 1 , wherein the image forming apparatus is an image forming apparatus.
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