JP4877965B2 - Fixing device and image forming apparatus having the same - Google Patents

Fixing device and image forming apparatus having the same Download PDF

Info

Publication number
JP4877965B2
JP4877965B2 JP2006302746A JP2006302746A JP4877965B2 JP 4877965 B2 JP4877965 B2 JP 4877965B2 JP 2006302746 A JP2006302746 A JP 2006302746A JP 2006302746 A JP2006302746 A JP 2006302746A JP 4877965 B2 JP4877965 B2 JP 4877965B2
Authority
JP
Japan
Prior art keywords
pressure
pressure receiving
heating
fixing
receiving member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2006302746A
Other languages
Japanese (ja)
Other versions
JP2008122438A (en
Inventor
直行 石田
昭浩 近藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyocera Document Solutions Inc
Original Assignee
Kyocera Mita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kyocera Mita Corp filed Critical Kyocera Mita Corp
Priority to JP2006302746A priority Critical patent/JP4877965B2/en
Publication of JP2008122438A publication Critical patent/JP2008122438A/en
Application granted granted Critical
Publication of JP4877965B2 publication Critical patent/JP4877965B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Fixing For Electrophotography (AREA)

Description

本発明は、複写機、プリンタ、ファクシミリ機等の画像形成装置に用いられる定着装置及びこれを備えた画像形成装置に関する。   The present invention relates to a fixing device used in an image forming apparatus such as a copying machine, a printer, and a facsimile machine, and an image forming apparatus including the same.

一般に、複写機等の電子写真方式による画像形成装置では、画像形成装置によりシート上に形成されたトナー像を加熱・加圧し、トナーを溶融させてシートに固着する手段として定着装置が用いられる。そして、定着装置は、トナーの加熱のため、通常発熱源を有している。ここで、定着装置をトナー溶融可能温度にまで急速に暖めることができれば、画像形成装置の電源投入後や、スリープモードからの復帰後の使用者の待ち時間を減らすことができ、使用者の利便性が向上する。又、画像形成装置の使用時にのみ発熱源に電力を供給することや、不使用時の定着装置の温度を従来に比べ低くしておくことも可能になり画像形成装置の消費電力を抑えることもできる。   In general, in an electrophotographic image forming apparatus such as a copying machine, a fixing device is used as means for heating and pressurizing a toner image formed on a sheet by the image forming apparatus to melt the toner and fix the toner image on the sheet. The fixing device usually has a heat source for heating the toner. Here, if the fixing device can be rapidly warmed to a temperature at which the toner can be melted, the waiting time of the user after the image forming apparatus is turned on or after returning from the sleep mode can be reduced. Improves. In addition, it is possible to supply power to the heat source only when the image forming apparatus is used, and to lower the temperature of the fixing device when not in use as compared with the conventional one, thereby reducing the power consumption of the image forming apparatus. it can.

そのため、定着装置を急速に暖めることができるように、定着装置は、スリーブ状の加熱部材と、加熱部材の内側に設けた発熱源と、加熱部材に圧接して加熱部材とニップを形成する加圧部材と、この加圧部材の圧力を受けるため加熱部材の内側に加熱部材と接して設けられる受圧部材等により構成されることがある。尚、このような定着装置では、加圧部材が回転駆動し、加熱部材は、これに従動するようになっている。   For this reason, the fixing device includes a sleeve-shaped heating member, a heat source provided inside the heating member, and a heating member that presses against the heating member to form a nip with the heating member so that the fixing device can be quickly warmed. The pressure member and a pressure receiving member provided in contact with the heating member inside the heating member to receive the pressure of the pressure member may be used. In such a fixing device, the pressure member is rotationally driven, and the heating member is driven.

ここで、加熱部材は、フィルム等から構成されスリーブ形状とされる。加熱部材は、薄肉であるから、急速に発熱源により暖められる。そして、加熱部材と加圧部材により形成されるニップにトナー像が転写されたシートが進入し、ニップに挟まれつつ搬送されることで、トナーは、加熱・加圧されて溶融し、シートに固着される。   Here, the heating member is made of a film or the like and has a sleeve shape. Since the heating member is thin, it is quickly heated by the heat source. Then, the sheet on which the toner image is transferred enters the nip formed by the heating member and the pressure member, and is conveyed while being sandwiched between the nips. It is fixed.

このような装置の一例として、特許文献1や特許文献2記載の発明が提案されている。特許文献1には、回動可能で、内部に支持部材(受圧部材)と輻射発熱源を備えた加熱部材と、加熱部材を加圧する加圧部材を有する定着装置において、加熱部材はフィルム等であり、支持部材は加熱部材を介して加圧部材と圧接され、定着ニップを形成する金属部材により形成されている定着装置が提案されている。このように構成することで、薄肉フィルムを加熱・駆動し、高速な加熱特性を有するようにしようとしている(特許文献1:請求項1、図1、段落0070参照)。   As an example of such a device, inventions described in Patent Document 1 and Patent Document 2 have been proposed. In Patent Document 1, a fixing device having a heating member that is rotatable and includes a support member (pressure receiving member) and a radiation heat source inside, and a pressure member that pressurizes the heating member, the heating member is a film or the like. There has been proposed a fixing device in which a support member is pressed against a pressure member via a heating member and is formed of a metal member that forms a fixing nip. With this configuration, a thin film is heated and driven to have high-speed heating characteristics (see Patent Document 1: Claim 1, FIG. 1, paragraph 0070).

又、特許文献2には、輻射光を吸収するフィルムもしくはベルト状の回動可能な加熱部材と、加熱部材内に配される輻射発熱源と、加熱部材の内面に摺動する保持部材(受圧部材)と、加熱部材を挟んで保持部材とニップを形成する加圧部材を備え、保持部材の摺動面は、クラウン形状であり、加熱部材と加圧部材の間に被加熱材を狭持搬送して加熱する加熱装置が提案されている。このように構成することで、加熱装置での加熱の高速化を図ろうとしている。尚、この加熱装置は、画像形成装置における定着装置にも用いられるものである(特許文献2:請求項1、請求項14、図2、段落0120参照)。
特開2004−094146 特開2004−062053
Patent Document 2 discloses a film or belt-shaped rotatable heating member that absorbs radiation light, a radiation heat source arranged in the heating member, and a holding member that slides on the inner surface of the heating member (pressure receiving). Member) and a pressure member that forms a nip with the heating member interposed therebetween, and the sliding surface of the holding member has a crown shape, and the material to be heated is sandwiched between the heating member and the pressure member. Heating devices that transport and heat have been proposed. By configuring in this way, an attempt is made to increase the speed of heating in the heating device. This heating device is also used for a fixing device in an image forming apparatus (see Patent Document 2: Claims 1, 14, and FIG. 2, paragraph 0120).
JP2004094146 JP2004-062053

ここで、一般に、定着装置は発熱源を有するから、定着装置における各部材は、熱により膨張する。   Here, since the fixing device generally has a heat source, each member in the fixing device expands due to heat.

そして、特許文献1及び2記載のような薄肉に形成された加熱部材と、加熱部材に加圧部材を圧接し、加圧部材の圧力を受圧部材で受け止めるような定着装置又は加熱装置においては、受圧部材の熱膨張により様々な弊害が生ずるという問題がある。具体的には、受圧部材が高温となり、熱で膨張すれば、受圧部材に歪みやねじれが発生してしまう場合がある。そうすると、受圧部材は、スリーブ形状の加熱部材とその軸線方向において接するように配され、加圧部材からの圧力を受け止めているから、受圧部材の膨張が加熱部材の回転に影響を与える。即ち、加熱部材と加圧部材のニップにおける圧力が不均等なものとなったり、加熱部材の回転の軸線をずらす原因となり、加圧部材に従動する加熱部材の回転が、受圧部材の膨張により適正なものでなくなってしまう。   And in the fixing device or the heating device in which the pressure member is pressed against the heating member, and the pressure member is received by the pressure member in the thin heating member as described in Patent Documents 1 and 2, There is a problem that various harmful effects are caused by thermal expansion of the pressure receiving member. Specifically, when the pressure receiving member becomes hot and expands with heat, the pressure receiving member may be distorted or twisted. Then, the pressure receiving member is arranged so as to be in contact with the sleeve-shaped heating member in the axial direction thereof, and receives the pressure from the pressure member, so that the expansion of the pressure receiving member affects the rotation of the heating member. That is, the pressure at the nip between the heating member and the pressure member becomes uneven or the axis of rotation of the heating member is shifted, and the rotation of the heating member driven by the pressure member is appropriate due to the expansion of the pressure receiving member. It ’s no longer a good thing.

受圧部材の膨張で、加熱部材の回転が歪んでしまうと、加熱部材に皺が生じる場合がある。この皺は、ニップを通過するシート上のトナーの加圧・加熱に影響を与え定着不良の原因となる。又、加熱部材がスラスト方向に移動したり、受圧部材等に接触したりして、加熱部材が傷つけられる場合もある。この傷は、定着不良の原因となり、加熱部材、ひいては定着装置の寿命を短命化する。更に、ニップにおける搬送力のずれが生じ得ることから、ニップに進入したシートに皺が入ることや、斜行の原因となり、ひいては、シートのジャムの原因となる。   If the rotation of the heating member is distorted by the expansion of the pressure receiving member, wrinkles may occur in the heating member. This wrinkle affects the pressurization and heating of the toner on the sheet passing through the nip, and causes a fixing failure. Further, the heating member may be damaged by moving in the thrust direction or contacting the pressure receiving member. This flaw causes a fixing failure and shortens the life of the heating member, and thus the fixing device. Further, since the conveyance force in the nip may be shifted, wrinkles may enter the sheet that has entered the nip, skewing, and jamming of the sheet.

ここで、特許文献1及び2記載の定着装置又は加熱装置をみると、支持部材(受圧部材)の熱膨張については一切考慮されておらず、熱膨張に言及した記載はない。ましてや、支持部材(受圧部材)の固定手段についても言及はない。従って、上記のような、受圧部材の熱膨張における問題に対応できない。   Here, in the fixing device or the heating device described in Patent Documents 1 and 2, thermal expansion of the support member (pressure receiving member) is not considered at all, and there is no description referring to thermal expansion. Furthermore, there is no mention of fixing means for the support member (pressure receiving member). Therefore, it cannot cope with the problem in the thermal expansion of the pressure receiving member as described above.

更にいえば、特許文献1又は2における定着装置又は加熱装置においては、加圧部材から加熱部材への圧力を確実に受け止めることができるように、支持部材(受圧部材)は機械的強度が要求され、部材は一定以上の厚み、大きさを有する必要がある。そうすると、支持部材(受圧部材)における熱膨張の影響は大きくなるという問題があり、又、支持部材(受圧部材)の熱容量が大きくなるという問題がある。   Furthermore, in the fixing device or the heating device in Patent Document 1 or 2, the support member (pressure receiving member) is required to have mechanical strength so that the pressure from the pressure member to the heating member can be reliably received. The member must have a certain thickness and size. If it does so, there exists a problem that the influence of the thermal expansion in a support member (pressure receiving member) becomes large, and also there exists a problem that the heat capacity of a support member (pressure receiving member) becomes large.

熱膨張の影響が大きいと、上記の問題が顕著に表れ得るものとなる。又、支持部材(受圧部材)の熱容量が大きくなると、定着装置を定着可能な温度まで暖めるための時間が長くなり得るものとなる。又、高速に連続して定着を行って、加熱部材の温度が下がった場合でも、支持部材(受圧部材)の熱容量が大きいから、加熱部材の熱を支持部材(受圧部材)が奪うことも考えられ、定着に要する温度に加熱部材が到達せず、定着不良が引き起こされ得る。   When the influence of thermal expansion is large, the above problem can be remarkably exhibited. Further, when the heat capacity of the support member (pressure receiving member) increases, the time for warming the fixing device to a temperature at which the fixing device can be fixed can be lengthened. In addition, even if the fixing is performed continuously at a high speed and the temperature of the heating member is lowered, the heat capacity of the support member (pressure receiving member) is large, so the heat of the heating member (pressure receiving member) may be taken away. Therefore, the heating member does not reach the temperature required for fixing, and fixing failure may be caused.

従って、結果として、特許文献1又は2記載の発明では、熱膨張の問題を解決できないだけでなく、定着装置が、トナーを溶融、定着させることが可能な温度まで暖められるまで時間を要し、又、加熱部材の熱を奪うから、定着不良も生じ得るのものとなる。   Therefore, as a result, in the invention described in Patent Document 1 or 2, not only the problem of thermal expansion cannot be solved, but it takes time until the fixing device is heated to a temperature at which the toner can be melted and fixed, In addition, since the heating member is deprived of heat, fixing failure may occur.

本発明は、上記従来技術の問題点に鑑みてなされたものであり、受圧部材の熱膨張による加熱部材の皺、傷の発生を防ぎ、定着不良やシートの搬送不良がなく、更に、定着装置を利用できるまでの時間が短縮された定着装置を提供することを目的とする。又、この定着装置を用いることにより、使用者の利便性が高く、形成される画像品質が良好かつ長寿命の画像形成装置を提供することを課題とする。   The present invention has been made in view of the above-described problems of the prior art, and prevents the occurrence of flaws and scratches on the heating member due to thermal expansion of the pressure receiving member, and there is no fixing failure or sheet conveyance failure. An object of the present invention is to provide a fixing device in which the time until use of the fixing device is shortened. Another object of the present invention is to provide an image forming apparatus that is highly convenient for the user, has a good image quality, and has a long life.

上記目的を達成するために、請求項1に係る定着装置は、スリーブ形状であって、回転可能となっている加熱部材と、前記加熱部材内に配され、輻射発熱源である発熱源と、加熱・加圧するためシートを通過させるニップを形成するように前記加熱部材と圧接されるとともに回転駆動する加圧部材と、前記加熱部材と前記加圧部材が形成するニップにおいて前記加圧部材の圧力を受けるため前記加熱部材の内側に前記加熱部材と接して設けられ、前記発熱源と接さない受圧部材と、前記受圧部材の位置を固定するための固定部材を備えた定着装置において、前記受圧部材は、前記加熱部材の軸線方向に沿うように側壁部を備えるとともに、弾性変形されながら前記固定部材に固定され、前記固定部材は、前記側壁部の長手方向における面が、前記固定部材と接することで、前記側壁部の弾性力を受け止め、前記側壁部は、前記加熱部材の軸線方向にわたって前記受圧部材に一面に形成されず前記受圧部材の長手方向端部から所定の長さで設けられることとした。 In order to achieve the above object, a fixing device according to claim 1 is a sleeve-shaped heating member that is rotatable, a heating source that is disposed in the heating member and is a radiation heating source , A pressure member that is in pressure contact with the heating member to form a nip through which a sheet is passed for heating and pressurization, and a rotation member that is driven to rotate; and a pressure of the pressure member in the nip formed by the heating member and the pressure member In the fixing device, the pressure receiving member is provided inside the heating member so as to be in contact with the heating member, and is not in contact with the heat generation source, and a fixing member for fixing the position of the pressure receiving member. The member includes a side wall portion along the axial direction of the heating member, and is fixed to the fixing member while being elastically deformed, and the fixing member has a surface in the longitudinal direction of the side wall portion, By contacting the serial fixing member, and stopper receiving the elastic force of the side wall portion, the side wall portion is not formed on one surface to the pressure receiving member over the axial direction of the heating member given from the longitudinal end portion of the pressure receiving member It was decided to be provided with the length.

請求項2に係る発明は、請求項1の発明において、前記加熱部材と前記加圧部材が形成するニップ部分において、前記加熱部材内に、前記受圧部材よりも内側であって、前記受圧部材と接し前記加圧部材の圧力を受け止めるための補強部材を設けていることとした。   The invention according to claim 2 is the invention according to claim 1, wherein, in the nip portion formed by the heating member and the pressure member, the heating member is inside the pressure receiving member, and the pressure receiving member A reinforcing member is provided for contacting and receiving the pressure of the pressure member.

請求項3に係る発明は、請求項1又は2記載の発明において、前記側壁部は、前記加熱部材のシート通過領域外に設けられることとした。   The invention according to claim 3 is the invention according to claim 1 or 2, wherein the side wall portion is provided outside a sheet passing region of the heating member.

請求項4に係る発明は、画像形成装置において、上記いずれかの定着装置を備えることとした。   According to a fourth aspect of the present invention, an image forming apparatus includes any one of the fixing devices described above.

請求項1記載の発明は、上述のように、受圧部材は、弾性変形されながら固定部材に固定されるから、受圧部材が強固に固定され、受圧部材が固定されるべき正規位置から移動し難いものとでき、又、受圧部材の位置決めが容易となる。   In the first aspect of the invention, as described above, since the pressure receiving member is fixed to the fixing member while being elastically deformed, the pressure receiving member is firmly fixed, and is difficult to move from the normal position where the pressure receiving member should be fixed. In addition, positioning of the pressure receiving member is facilitated.

更に、固定部材は、受圧部材の側壁部の軸線方向における面が、固定部材と接することで、側壁部の弾性力を受け止める。これにより、定着装置が暖められることで受圧部材が熱で膨張し、受圧部材に歪み、ねじれ、膨らみ等の変形が生じ、受圧部材が固定されるべき正規の位置から移動しようとしても、固定部材に押し当てられた側壁部が変形し、一定以上には受圧部材が正規位置から移動しないようにするとともに、受圧部材が正規位置に戻るように押し戻す。即ち、側壁部の弾性力で受圧部材の熱膨張による歪み等の変形が吸収され、受圧部材は正規位置を維持する。   Furthermore, the fixing member receives the elastic force of the side wall portion when the surface in the axial direction of the side wall portion of the pressure receiving member is in contact with the fixing member. As a result, when the fixing device is warmed, the pressure receiving member expands due to heat, and the pressure receiving member is deformed, distorted, twisted, bulged, and the like. The side wall portion pressed against is deformed to prevent the pressure receiving member from moving from the normal position beyond a certain level, and the pressure receiving member is pushed back to return to the normal position. That is, deformation such as distortion due to thermal expansion of the pressure receiving member is absorbed by the elastic force of the side wall, and the pressure receiving member maintains the normal position.

従って、受圧部材の熱膨張による加熱部材の不正規な回転の発生が防がれる。そうすると、加熱部材における皺や傷が生じなくなることで、定着不良がなくなり、又、加熱部材、定着装置の長寿命化を図ることができる。又、加熱部材と加圧部材のニップにおける圧力の不均衡もなくなるからシートの搬送不良も防ぐことができる。又、側壁部を受圧部材の長手方向の全長にわたって設けると、例えばハロゲンヒータを使用した場合、受圧部材も少なからず輻射熱を奪うものとなる。しかし、側壁部の長さを受圧部材の長手方向端部から所定の長さに止めることで、加熱部材を暖めるべき熱を奪わない。従って、定着装置のウォーミングアップ時間を短縮することが可能となる。 Accordingly, it is possible to prevent the rotation of the heating member due to the thermal expansion of the pressure receiving member. Then, wrinkles and scratches on the heating member do not occur, so that fixing defects are eliminated, and the life of the heating member and the fixing device can be extended. Further, since there is no pressure imbalance in the nip between the heating member and the pressure member, sheet conveyance failure can be prevented. Further, when the side wall portion is provided over the entire length in the longitudinal direction of the pressure receiving member, for example, when a halogen heater is used, the pressure receiving member also takes away radiant heat. However, the heat which should heat a heating member is not deprived by stopping the length of a side wall part to predetermined length from the longitudinal direction edge part of a pressure receiving member. Accordingly, it is possible to shorten the warm-up time of the fixing device.

請求項2記載の発明によれば、請求項1記載の発明の効果に加え、補強部材を設けるから、加圧部材から加熱部材への圧力を受圧部材だけで受けなくてもよくなり、受圧部材の強度を下げることが可能となる。即ち、受圧部材を小さく、薄くすることができ、受圧部材の熱容量を従来よりも小さくすることができる。従って、受圧部材が熱を奪い難くなり、定着装置を暖めるためのウォーミングアップ時間を短縮することができ、高速で連続して定着を行っても、定着不良の発生を防ぐことができる。   According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the reinforcing member is provided, it is not necessary to receive the pressure from the pressure member to the heating member only by the pressure receiving member. It is possible to reduce the strength of the. That is, the pressure receiving member can be made small and thin, and the heat capacity of the pressure receiving member can be made smaller than before. Accordingly, it becomes difficult for the pressure receiving member to take heat, the warm-up time for warming the fixing device can be shortened, and the occurrence of fixing failure can be prevented even if fixing is performed continuously at high speed.

請求項3記載の発明によれば、請求項1又は2記載の発明の効果に加え、前記側壁部は、前記加熱部材のシート通過領域外に設けるから、シート通過領域における受圧部材の熱容量を小さくでき、側壁部が発熱源からの熱や加熱部材の熱を奪い難いものとできる。従って、定着装置を暖めるためのウォーミングアップ時間を短縮することができ、高速で連続して定着を行っても、定着不良の発生を防ぐことができる。   According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, since the side wall portion is provided outside the sheet passing area of the heating member, the heat capacity of the pressure receiving member in the sheet passing area is reduced. The side wall portion can hardly take heat from the heat source or heat of the heating member. Accordingly, the warm-up time for warming the fixing device can be shortened, and even if fixing is performed continuously at high speed, it is possible to prevent the occurrence of fixing failure.

請求項4記載の発明によれば、上記請求項1乃至3いずれか1項に記載の定着装置を備えるから、定着不良がない画像形成装置が提供され、形成される画像の品質が高く、安定する。又、定着装置を通過したシートに皺が入ることや、シートが詰まってしまうようなシートの搬送不良のない画像形成装置を提供できる。又、定着装置を暖めるための時間を短縮でき使用者の利便性が向上した画像形成装置を提供できる。   According to a fourth aspect of the present invention, since the fixing device according to any one of the first to third aspects is provided, an image forming apparatus free from fixing defects is provided, and the quality of the formed image is high and stable. To do. In addition, it is possible to provide an image forming apparatus that does not have a sheet conveyance defect such that wrinkles enter the sheet that has passed through the fixing device or the sheet is jammed. Further, it is possible to provide an image forming apparatus in which the time for warming the fixing device can be shortened and the convenience for the user is improved.

以下、本発明の第1の実施形態について図1〜6を参照しつつ説明する。但し、本実施の形態に記載されている構成、配置等の各要素は、発明の範囲を限定するものではなく単なる説明例にすぎない。   Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. However, each element such as configuration and arrangement described in this embodiment does not limit the scope of the invention and is merely an illustrative example.

まず、図1を用いて、本発明の実施形態における定着装置1を備えた電子写真方式でフルカラー対応の画像形成装置2の概略を説明する。図1は、本発明の実施形態に係る画像形成装置2の概略構成を示す正面から見た模型的断面図である。 First, an outline of an electrophotographic full-color image forming apparatus 2 including a fixing device 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic cross-sectional view seen from the front showing a schematic configuration of an image forming apparatus 2 according to an embodiment of the present invention.

図1に示すように、画像形成装置2は、箱形を呈したケース2aを有する。このケース2a内に、画像形成部10、中間転写部20、2次転写部30、シート供給部40、シート搬送路50、定着装置1、排出部60等を備えている。   As shown in FIG. 1, the image forming apparatus 2 includes a case 2a having a box shape. The case 2a includes an image forming unit 10, an intermediate transfer unit 20, a secondary transfer unit 30, a sheet supply unit 40, a sheet conveyance path 50, a fixing device 1, a discharge unit 60, and the like.

前記画像形成部10は、画像形成装置2に入力された画像データに基づき、トナー像を形成するためのものである。画像形成部10は、画像形成装置2の内部の上方に位置するように設けられる。図1に示すように、画像形成部10は、ブラックの画像を形成する画像形成ユニット10Bと、イエローの画像を形成する画像形成ユニット10Yと、シアンの画像を形成する画像形成ユニット10Cと、マゼンタの画像を形成する画像形成ユニット10Mの4つの画像形成ユニット10B、10Y、10C、10Mを備えている。これにより、画像形成装置2は、フルカラーの画像形成を行えるようになっている。   The image forming unit 10 is for forming a toner image based on the image data input to the image forming apparatus 2. The image forming unit 10 is provided so as to be positioned above the inside of the image forming apparatus 2. As shown in FIG. 1, the image forming unit 10 includes an image forming unit 10B that forms a black image, an image forming unit 10Y that forms a yellow image, an image forming unit 10C that forms a cyan image, and a magenta image. Image forming units 10B, 10Y, 10C, and 10M are provided. Thereby, the image forming apparatus 2 can perform full-color image formation.

4つの画像形成ユニット10B、10Y、10C、10Mは、図1の紙面の左側から右側へ向けて、順次、10B(ブラック)、10Y(イエロー)、10C(シアン)、10M(マゼンダ)の順に配される。尚、各画像形成ユニット10B、10Y、10C、10Mの構成は同様であるから、以下では、ブラックの画像を形成する画像形成ユニット10Bを例として説明する。従って、他の画像形成ユニット10Y、10C、10M、も同様に説明でき、以下、特に説明がない限り画像形成ユニット10Bについての説明は、他の画像形成ユニット10Y、10C、10Mにもあてはまる。   The four image forming units 10B, 10Y, 10C, and 10M are sequentially arranged in the order of 10B (black), 10Y (yellow), 10C (cyan), and 10M (magenta) from the left side to the right side in FIG. Is done. Since the image forming units 10B, 10Y, 10C, and 10M have the same configuration, the image forming unit 10B that forms a black image will be described below as an example. Accordingly, the other image forming units 10Y, 10C, and 10M can be described in the same manner. Hereinafter, the description of the image forming unit 10B also applies to the other image forming units 10Y, 10C, and 10M unless otherwise specified.

図1に示すように、画像形成ユニット10Bは、像担持体としての感光体ドラム11、帯電ローラ12、露光装置13、現像装置14、1次転写ローラ15、ドラムクリーニングローラ16等がそれぞれ設けられている。   As shown in FIG. 1, the image forming unit 10B is provided with a photosensitive drum 11 as an image carrier, a charging roller 12, an exposure device 13, a developing device 14, a primary transfer roller 15, a drum cleaning roller 16, and the like. ing.

前記感光体ドラム11は、その周面上に静電潜像が形成された後、トナーが供給されることで、トナー像を形成するためのものである。感光体ドラム11は、画像形成ユニット10Bの中央位置に配されている。例えば、感光体ドラム11は、アルミニウム製のドラムの外周面上に正帯電のOPCやアモルファスシリコンの感光層を有するように構成されていて、駆動装置(不図示)によって所定のプロセススピードで図1の正面視反時計方向に回転駆動される。   The photosensitive drum 11 is for forming a toner image by supplying toner after an electrostatic latent image is formed on the peripheral surface thereof. The photosensitive drum 11 is disposed at the center position of the image forming unit 10B. For example, the photosensitive drum 11 is configured to have a positively charged OPC or amorphous silicon photosensitive layer on the outer peripheral surface of an aluminum drum, and is driven at a predetermined process speed by a driving device (not shown). Is rotated counterclockwise when viewed from the front.

前記帯電ローラ12は、所定の電位で感光体ドラム11の周面を帯電させるためのものである。そのため帯電ローラ12には、所定の電圧が印加されるようになっている。そして、帯電ローラ12は、図1において感光体ドラム11上方に配されていて、所定のプロセススピードで図1の正面視時計方向に回転するようになっている。   The charging roller 12 is for charging the peripheral surface of the photosensitive drum 11 with a predetermined potential. Therefore, a predetermined voltage is applied to the charging roller 12. The charging roller 12 is disposed above the photosensitive drum 11 in FIG. 1 and rotates in the clockwise direction in FIG. 1 at a predetermined process speed.

前記露光装置13は、帯電ローラ12によって一様に帯電された感光体ドラム11の周面に、画像形成装置2に入力された形成すべき画像データに基づき、レーザ光を感光体ドラム11に対し照射し、感光体ドラム11の周面を走査・露光するためのものである。これにより、感光体ドラム11の周面上に静電潜像が形成される。そして、図1において、露光装置13は感光体ドラム11の上方であって、帯電ローラ12の感光体ドラム11の回転方向下流側に位置するように配されている。   The exposure device 13 applies laser light to the photosensitive drum 11 on the peripheral surface of the photosensitive drum 11 uniformly charged by the charging roller 12 based on the image data to be formed input to the image forming device 2. This is for irradiating and scanning and exposing the peripheral surface of the photosensitive drum 11. As a result, an electrostatic latent image is formed on the peripheral surface of the photosensitive drum 11. In FIG. 1, the exposure device 13 is disposed above the photosensitive drum 11 and on the downstream side of the charging roller 12 in the rotation direction of the photosensitive drum 11.

前記現像装置14は、感光体ドラム11の周面上に形成された静電潜像に向けて、トナーを供給するものである。感光体ドラム11上の静電潜像に現像装置14からトナーが供給されることで、感光体ドラム11の周面上にトナー像が形成されることになる。そして、現像装置14は、図1において感光体ドラム11の左側方に設けられていて、感光体ドラム11と所定の隙間が設けられつつ対向する位置に現像ローラ14aが設けられている。又、現像ローラ14aは、所定のプロセススピードで図1の正面視時計又は反時計方向に回転するようになっている。   The developing device 14 supplies toner toward the electrostatic latent image formed on the peripheral surface of the photosensitive drum 11. By supplying toner from the developing device 14 to the electrostatic latent image on the photosensitive drum 11, a toner image is formed on the peripheral surface of the photosensitive drum 11. The developing device 14 is provided on the left side of the photosensitive drum 11 in FIG. 1, and a developing roller 14a is provided at a position facing the photosensitive drum 11 while providing a predetermined gap. Further, the developing roller 14a rotates in a clockwise or counterclockwise direction in FIG. 1 at a predetermined process speed.

そして、現像装置14は、主としてブラックのトナーからなる現像剤を収容している(尚、画像形成ユニット10Yの現像装置14はイエローのトナーを含む現像剤を、画像形成ユニット10Cの現像装置14はシアンのトナーを含む現像剤を、画像形成ユニット10Mの現像装置14はマゼンタのトナーを含む現像剤を収納している)。現像剤は、現像ローラ14aの上方において現像装置14内に収容されている。又、現像ローラ14aの斜め上方に配されたトナー供給ローラ14bは、現像ローラ14aの周面にトナーの薄層が形成されるように、適切な量のトナー(現像剤)を現像ローラ14aに供給するためのものである。   The developing device 14 contains a developer mainly composed of black toner (note that the developing device 14 of the image forming unit 10Y is a developer containing yellow toner, and the developing device 14 of the image forming unit 10C is a developing device 14). The developing device 14 of the image forming unit 10M stores a developer containing magenta toner. The developer is accommodated in the developing device 14 above the developing roller 14a. The toner supply roller 14b disposed obliquely above the developing roller 14a applies an appropriate amount of toner (developer) to the developing roller 14a so that a thin layer of toner is formed on the peripheral surface of the developing roller 14a. It is for supply.

前記1次転写ローラ15は、後述する中間転写部20において張架されている中間転写ベルト24に、感光体ドラム11上に形成されたトナー像を転写するためのものである。そして、1次転写ローラ15は、感光体ドラム11の下方に配され、感光体ドラム11と無端状の中間転写ベルト24を介して当接し、1次転写のためのニップを形成する。1次転写ローラ15には、トナー像の転写のため所定の電圧が印加される。又、1次転写ローラ15は、図1において感光体ドラム11及び中間転写ベルト24に従動し、図1の正面視反時計方向に回転するようになっている。   The primary transfer roller 15 is for transferring a toner image formed on the photosensitive drum 11 to an intermediate transfer belt 24 stretched in an intermediate transfer unit 20 described later. The primary transfer roller 15 is disposed below the photosensitive drum 11 and abuts with the photosensitive drum 11 via an endless intermediate transfer belt 24 to form a nip for primary transfer. A predetermined voltage is applied to the primary transfer roller 15 for transferring the toner image. Further, the primary transfer roller 15 is driven by the photosensitive drum 11 and the intermediate transfer belt 24 in FIG. 1 and rotates counterclockwise when viewed from the front in FIG.

前記ドラムクリーニングローラ16は、感光体ドラム11の表面に残った1次転写残トナーを除去して回収するためのものであり、次に形成されるトナー像が適切に形成されるようにするためのものである。例えば、前記ドラムクリーニングローラ16は、周面がEPDMのような素材で、円筒状に形成されていて、所定のプロセススピードで図1の正面視反時計方向に回転駆動されている。   The drum cleaning roller 16 is used to remove and collect the primary transfer residual toner remaining on the surface of the photosensitive drum 11 so that the toner image to be formed next can be appropriately formed. belongs to. For example, the drum cleaning roller 16 has a peripheral surface made of a material such as EPDM, is formed in a cylindrical shape, and is driven to rotate counterclockwise in a front view of FIG. 1 at a predetermined process speed.

次に、中間転写部20について説明する。前記中間転写部20は、感光体ドラム11上に形成されたトナー像が転写され、転写されたトナー像をシートSに転写するためのものである。そして、中間転写部20は、本実施形態における画像形成装置2内のほぼ中心に配され、駆動ローラ21、2本のテンションローラ22、23、中間転写ベルト24、ベルトクリーニング装置25等を備えている。   Next, the intermediate transfer unit 20 will be described. The intermediate transfer unit 20 is for transferring a toner image formed on the photosensitive drum 11 and transferring the transferred toner image to the sheet S. The intermediate transfer unit 20 is disposed substantially at the center in the image forming apparatus 2 in the present embodiment, and includes a driving roller 21, two tension rollers 22, 23, an intermediate transfer belt 24, a belt cleaning device 25, and the like. Yes.

駆動ローラ21は、画像形成ユニット10Bの下方に位置するように配されていて、中間転写ベルト24を回転させるためのものであり、モータ(不図示)から回転駆動力が伝達される。テンションローラ22、23は各画像形成ユニット10B、10Y、10C、10Mにおける各感光体ドラム11と各1次転写ローラ15の間のニップにおいて、中間転写ベルト24が一直線上となるように、図1において、画像形成ユニット10Bの感光体ドラム11の左方に1つ、画像形成ユニット10Mの右方に1つ設けられ、回転可能に支持されている。   The driving roller 21 is disposed so as to be positioned below the image forming unit 10B, and is for rotating the intermediate transfer belt 24. A rotational driving force is transmitted from a motor (not shown). The tension rollers 22 and 23 are arranged so that the intermediate transfer belt 24 is in a straight line at the nip between each photosensitive drum 11 and each primary transfer roller 15 in each of the image forming units 10B, 10Y, 10C, and 10M. 1, one on the left side of the photosensitive drum 11 of the image forming unit 10 </ b> B and one on the right side of the image forming unit 10 </ b> M, and are rotatably supported.

そして、中間転写ベルト24は、これらの駆動ローラ21、テンションローラ22、23、各1次転写ローラ15に張架されていて、駆動ローラ21が回転することで、図1の正面視反時計方向に回転駆動される。又、中間転写ベルト24は上述したように、感光体ドラム11と1次転写ローラ15が形成するニップを通るように張架されていて、感光体ドラム11上のトナー像は、所定のタイミングで1次転写ローラ15に転写電圧を印加することで、中間転写ベルト24上に1次転写される。   The intermediate transfer belt 24 is stretched around the drive roller 21, tension rollers 22 and 23, and the primary transfer rollers 15, and the drive roller 21 rotates to rotate counterclockwise as viewed from the front in FIG. Is driven to rotate. Further, as described above, the intermediate transfer belt 24 is stretched so as to pass through the nip formed by the photosensitive drum 11 and the primary transfer roller 15, and the toner image on the photosensitive drum 11 is transferred at a predetermined timing. By applying a transfer voltage to the primary transfer roller 15, primary transfer is performed on the intermediate transfer belt 24.

尚、ベルトクリーニング装置25は、中間転写ベルト24の表面に残った2次転写残トナーを清掃し、除去して回収するためのものであり、中間転写ベルト24に接離機構(不図示)により接離自在となっていて、図1において、駆動ローラ21及びテンションローラ22の左方に設けられている   The belt cleaning device 25 is for cleaning, removing, and collecting secondary transfer residual toner remaining on the surface of the intermediate transfer belt 24. The belt cleaning device 25 is connected to the intermediate transfer belt 24 by a contact / separation mechanism (not shown). In FIG. 1, it is provided on the left side of the drive roller 21 and the tension roller 22.

前記2次転写部30は、主として2次転写ローラ31及び駆動ローラ21から構成されている。前記2次転写ローラ31は、中間転写ベルト24上に1次転写されたトナー像を、用紙等のシートSに転写する2次転写を行うためのものである。そして、2次転写ローラ31は、中間転写ベルト24を介し、所定のタイミングで、接離機構(不図示)により、駆動ローラ21に圧接される。この際、2次転写ローラ31には、転写電圧が印加され、トナー像がシートSに転写される。   The secondary transfer unit 30 mainly includes a secondary transfer roller 31 and a drive roller 21. The secondary transfer roller 31 is for performing secondary transfer in which the toner image primarily transferred onto the intermediate transfer belt 24 is transferred to a sheet S such as paper. The secondary transfer roller 31 is pressed against the drive roller 21 via the intermediate transfer belt 24 by a contact / separation mechanism (not shown) at a predetermined timing. At this time, a transfer voltage is applied to the secondary transfer roller 31, and the toner image is transferred to the sheet S.

前記シート供給部40は、2次転写部30に向けて、例えば、コピー用紙、OHPシートS、ラベル用紙等のシートSを供給するためのものである。シート供給部40は、カセット41、ピックアップローラ42、重送防止ローラ対43等から構成されている。カセット41は、複数のシートSを収容するためのものであって、函型かつ上面が開放されている。又、カセット41内には複数のシートSが載置される載置板44が設けられている。又、図1におけるカセット41の右上方位置にピックアップローラ42が設けられる。具体的なシート供給動作をみると、載置板44に設けられたリフト機構(不図示)により、載置された最上位のシートSがピックアップローラ42に当接し、ピックアップローラ42の駆動により、シートSが1枚ずつシート搬送路50に送り出される。尚、ピックアップローラ42の近傍かつシート搬送方向下流側には、重送防止ローラ対43が設けられている。重送防止ローラ対43は、それぞれのローラが同方向に回転するようになっていて、シートSが重なったまま搬送されること防ぐ。   The sheet supply unit 40 is for supplying, for example, a sheet S such as a copy sheet, an OHP sheet S, or a label sheet, to the secondary transfer unit 30. The sheet supply unit 40 includes a cassette 41, a pickup roller 42, a double feed prevention roller pair 43, and the like. The cassette 41 is for accommodating a plurality of sheets S, and has a box shape and an open upper surface. In addition, a placement plate 44 on which a plurality of sheets S are placed is provided in the cassette 41. A pickup roller 42 is provided at the upper right position of the cassette 41 in FIG. When a specific sheet supply operation is seen, a lift mechanism (not shown) provided on the placement plate 44 causes the uppermost sheet S placed on the pickup roller 42 to abut on the pickup roller 42. The sheets S are sent out one by one to the sheet conveyance path 50. A double feed prevention roller pair 43 is provided in the vicinity of the pickup roller 42 and on the downstream side in the sheet conveying direction. The double feed prevention roller pair 43 is configured such that each roller rotates in the same direction and prevents the sheet S from being conveyed while being overlapped.

前記シート搬送路50は、シート供給部40から、2次転写部30及び定着装置1を経て排出部60までシートSを搬送するためのものであり、複数のガイド51や搬送ローラ対52で構成されている。尚、2次転写部30のシート搬送方向上流側には、レジストローラ対53が設けられている、レジストローラ対53は、一旦、搬送されてきたシートSを止め、2次転写部30でシートSの適切な位置でトナー像が転写されるように、所定のタイミングと速度でシートSを2次転写部30に送り出す。尚、図1において、シートの搬送方向を破線で示している。   The sheet conveyance path 50 is for conveying the sheet S from the sheet supply unit 40 to the discharge unit 60 through the secondary transfer unit 30 and the fixing device 1, and includes a plurality of guides 51 and conveyance roller pairs 52. Has been. A registration roller pair 53 is provided on the upstream side of the secondary transfer unit 30 in the sheet conveyance direction. The registration roller pair 53 temporarily stops the sheet S that has been conveyed, and the secondary transfer unit 30 forms a sheet. The sheet S is sent to the secondary transfer unit 30 at a predetermined timing and speed so that the toner image is transferred at an appropriate position of S. In FIG. 1, the sheet conveyance direction is indicated by a broken line.

定着装置1は、シートSに2次転写されたトナー像を加圧・加熱し、トナーを溶融し、シートSに固着させるためのものであるが、詳細は後述する。   The fixing device 1 presses and heats the toner image secondarily transferred to the sheet S, melts the toner, and fixes the toner image to the sheet S. Details will be described later.

排出部60は、画像が形成されたシートSを画像形成装置2内から排出するためのものであり、排出口には、シートSを排出するための排出ローラ対61が設けられている。更に、画像形成装置2の上面には、排出されたシートSを受け止めるための排出トレイ61が設けられ、一定部数の画像形成済みのシートSが載置可能となっている。   The discharge unit 60 is for discharging the sheet S on which an image is formed from the image forming apparatus 2, and a discharge roller pair 61 for discharging the sheet S is provided at the discharge port. Further, a discharge tray 61 for receiving the discharged sheet S is provided on the upper surface of the image forming apparatus 2, and a fixed number of image-formed sheets S can be placed thereon.

次に、上記した画像形成装置2による画像形成動作について説明する。   Next, an image forming operation by the above-described image forming apparatus 2 will be described.

画像形成開始信号が発せられると、所定のプロセススピードで回転駆動される感光体ドラム11は、帯電ローラ12によって一様に正極性に帯電される。そして、露光装置13は、入力される画像信号を光信号にそれぞれ変換し、レーザを帯電された感光体ドラム11上を走査露光する。これにより、静電潜像が形成される。   When the image formation start signal is issued, the photosensitive drum 11 that is rotationally driven at a predetermined process speed is uniformly charged to the positive polarity by the charging roller 12. The exposure device 13 converts each input image signal into an optical signal, and performs scanning exposure on the photosensitive drum 11 charged with a laser. Thereby, an electrostatic latent image is formed.

そして、感光体ドラム11上に形成された静電潜像は、感光体ドラム11の帯電極性(正極性)と同極性の現像バイアスが印加された現像装置14によりトナーの供給を受け、トナー像として可視像化される。その後、トナー像は、感光体ドラム11と転写ローラ間の1次転写部にて1次転写バイアス(トナーと逆極性(負極性))が印加された転写ローラにより、回転(移動)している中間転写ベルト24上に1次転写される。   The electrostatic latent image formed on the photosensitive drum 11 is supplied with toner by the developing device 14 to which a developing bias having the same polarity as the charging polarity (positive polarity) of the photosensitive drum 11 is applied, and the toner image As a visible image. Thereafter, the toner image is rotated (moved) by a transfer roller to which a primary transfer bias (a polarity opposite to that of toner (negative polarity)) is applied at a primary transfer portion between the photosensitive drum 11 and the transfer roller. Primary transfer is performed on the intermediate transfer belt 24.

ここで、カラーの画像を形成する場合、上記と同様のプロセスで、まず画像形成ユニット10Bにてブラックのトナー像を中間転写ベルト24に一時転写する。次に、画像形成ユニット10Yに中間転写ベルト24の当該部分は回転移動される。そして、画像形成部10Yにおいてイエローのトナー像が、重ね合わされる。これを繰り返し、画像形成ユニット10Cにおいてシアンのトナー像が、画像形成部10Mにおいてマゼンダのトナー像上に重ね合わされる。このようにして、中間転写ベルト24に1次転写され、中間転写ベルト24を1回転させるだけで、フルカラーのトナー像が形成される。   Here, when forming a color image, a black toner image is first temporarily transferred to the intermediate transfer belt 24 by the image forming unit 10B in the same process as described above. Next, the portion of the intermediate transfer belt 24 is rotationally moved to the image forming unit 10Y. Then, the yellow toner image is superimposed on the image forming unit 10Y. This process is repeated, and the cyan toner image is superimposed on the magenta toner image in the image forming unit 10M in the image forming unit 10C. In this manner, a primary transfer is performed on the intermediate transfer belt 24, and a full-color toner image is formed by only rotating the intermediate transfer belt 24 once.

そして、中間転写ベルト24上で重ね合わせられたトナー像は2次転写部50で搬送されてきたシートSに二次転写され、シートSは定着装置1に搬送されてトナー像が溶融、固着された後、排出部60より排出される。   The toner images superimposed on the intermediate transfer belt 24 are secondarily transferred to the sheet S conveyed by the secondary transfer unit 50, and the sheet S is conveyed to the fixing device 1 so that the toner image is melted and fixed. And then discharged from the discharge unit 60.

次に、図2乃至図4に基づき、本発明の実施形態における定着装置1の構造、構成について述べる。図2は、本発明の実施形態に係る定着装置1の斜視図である。図3は、本発明の実施形態に係る定着装置1の一端部における拡大斜視図である。図4は、実施形態に係る定着装置1の断面図である。 Next, the structure and configuration of the fixing device 1 according to the embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a perspective view of the fixing device 1 according to the embodiment of the present invention. FIG. 3 is an enlarged perspective view of one end portion of the fixing device 1 according to the embodiment of the present invention. FIG. 4 is a cross-sectional view of the fixing device 1 according to the embodiment .

図2乃至図4に示すように、本実施形態における定着装置1は、筐体71、加熱部材72、加圧部材73、受圧部材74、固定部材75、補強部材76等から構成されている。   As shown in FIGS. 2 to 4, the fixing device 1 in the present embodiment includes a casing 71, a heating member 72, a pressure member 73, a pressure receiving member 74, a fixing member 75, a reinforcing member 76, and the like.

前記筐体71は、図2における左右方向に長く形成されている。即ち、加熱部材72や加圧部材73の軸線方向と平行な方向に長く形成されている。そして、筐体71は基本的に3つの部材から構成されている。具体的には、矩形状の上面板71aと上面板71aの長手方向の端部で取り付けられた断面が略L字上の2枚の側面板71b、71cから構成されている。又、2枚の側面板71b、71cには小判形状の貫通孔71dが設けられている。このように構成される筐体71は、上面板71aの長手方向と垂直な方向から見て断面が略コの字状となっている。   The casing 71 is formed long in the left-right direction in FIG. That is, it is formed long in a direction parallel to the axial direction of the heating member 72 and the pressure member 73. And the housing | casing 71 is comprised from three members fundamentally. Specifically, the upper surface plate 71a having a rectangular shape and the cross section attached at the end in the longitudinal direction of the upper surface plate 71a are composed of two side plates 71b and 71c that are substantially L-shaped. The two side plates 71b and 71c are provided with an oval through hole 71d. The casing 71 configured as described above has a substantially U-shaped cross section when viewed from a direction perpendicular to the longitudinal direction of the upper surface plate 71a.

図2及び図3に示すように、前記加熱部材72は、スリーブ状となっていて、本実施形態における加熱部材72は、円筒形状となっている。そして、加熱部材72の下方には、加熱部材72と接するようにして、加熱部材72の軸線と平行になるようにローラ状の加圧部材73が設けられている。又、加圧部材73の両端部からは、ローラ軸73aが突出していて、別途、画像形成装置1のケースその他の部材により回転可能に支持され、このローラ軸73aに駆動機構(不図示)及びモータ(不図示)を接続することにより、加圧部材73は所定の速さで回転駆動する。従って、加熱部材72と加圧部材73は接しているから、加圧部材73の回転に従動して加熱部材72も回転するようになっている。尚、加圧部材73は、加熱部材72よりも軸線方向において長く形成されており、又、加熱部材72の軸線の中点と、加圧部材73の軸線の中点がほぼ一致するように配されている。   As shown in FIGS. 2 and 3, the heating member 72 has a sleeve shape, and the heating member 72 in the present embodiment has a cylindrical shape. A roller-shaped pressure member 73 is provided below the heating member 72 so as to be in contact with the heating member 72 and parallel to the axis of the heating member 72. A roller shaft 73a protrudes from both ends of the pressure member 73, and is separately supported rotatably by a case and other members of the image forming apparatus 1. A driving mechanism (not shown) and a roller shaft 73a are supported on the roller shaft 73a. By connecting a motor (not shown), the pressure member 73 is driven to rotate at a predetermined speed. Therefore, since the heating member 72 and the pressure member 73 are in contact with each other, the heating member 72 is also rotated by the rotation of the pressure member 73. The pressurizing member 73 is formed longer in the axial direction than the heating member 72, and is arranged so that the midpoint of the heating member 72 and the midpoint of the pressurizing member 73 substantially coincide. Has been.

筐体71の長手方向において、側面板71b、71cの内側と外側に跨るようにして、貫通孔71dの下部に固定部材75が配されている。固定部材75は、加熱部材72の軸線方向から見て凸型の形状となっている。又、固定部材75は、最終的に筐体71と結合され、固定される。   In the longitudinal direction of the casing 71, a fixing member 75 is disposed below the through hole 71d so as to straddle the inside and outside of the side plates 71b and 71c. The fixing member 75 has a convex shape when viewed from the axial direction of the heating member 72. Further, the fixing member 75 is finally coupled to the casing 71 and fixed.

そして、図2及び図3に示すように、固定部材75と固定部材75に挟まれるようにして、受圧部材74及び補強部材76が、加熱部材72の内側で固定部材75により固定されている。図2及び3で示すように、受圧部材74の上面に受圧部材74と接して補強部材76が設けられている。尚、加熱部材72と受圧部材74と補強部材76との位置関係の詳細は後述する。   2 and 3, the pressure receiving member 74 and the reinforcing member 76 are fixed by the fixing member 75 inside the heating member 72 so as to be sandwiched between the fixing member 75 and the fixing member 75. As shown in FIGS. 2 and 3, a reinforcing member 76 is provided on the upper surface of the pressure receiving member 74 in contact with the pressure receiving member 74. The details of the positional relationship among the heating member 72, the pressure receiving member 74, and the reinforcing member 76 will be described later.

次に、図4に基づき、実施形態に係る定着装置1の詳細な構造について述べる。 Next, based on FIG. 4, the detailed structure of the fixing device 1 according to the embodiment will be described.

図4に示す断面図からも明らかなように、実施形態に係る定着装置1は、筐体71の他、スリーブ形状で回転可能となっている加熱部材72、加熱部材72内に配された発熱源77、前記加熱部材72と圧接されるとともに回転駆動する加圧部材73、加熱部材72と加圧部材73が形成するニップにおいて加圧部材73の圧力を受けるため加熱部材72の内側に前記加熱部材72と接して設けられる受圧部材74、受圧部材74よりも内側で受圧部材74と接し加圧部材73の圧力を受け止めるための補強部材76、受圧部材74や補強部材76の位置を固定するための固定部材75から構成されている。 As is clear from the cross-sectional view shown in FIG. 4, the fixing device 1 according to the embodiment includes a casing 71, a heating member 72 that is rotatable in a sleeve shape, and heat generated in the heating member 72. A source 77, a pressure member 73 that is in pressure contact with the heating member 72 and rotationally driven, and receives the pressure of the pressure member 73 at a nip formed by the heating member 72 and the pressure member 73. The pressure receiving member 74 provided in contact with the member 72, the reinforcing member 76 for contacting the pressure receiving member 74 on the inner side of the pressure receiving member 74 and receiving the pressure of the pressure member 73, and the positions of the pressure receiving member 74 and the reinforcing member 76 are fixed. It is comprised from the fixing member 75 of this.

図4に示すように、前記加熱部材72は、薄肉に形成されたフィルム状又はベルト状のものであり、スリーブ状、円筒状に形成されている。本実施形態における加熱部材72は、例えば、厚さを30μm程度とすることが可能である。又、加熱部材72は、熱容量、強度、耐熱性、耐摩耗性等を鑑みて、例えば、SUS(ステンレス鋼)を用いることができる。尚、加熱部材72には、金属だけでなく、例えばポリイミドのような樹脂を用いることも可能である。又、加熱部材72の表面(周面)をフッ素樹脂等により離型性を高められた離型層を有するようにしてもよい。これにより、ニップを通過したシートSで溶融・固着されたトナーの粘着性により加熱部材72にシートSが貼り付いてしまうことを防ぐことができ、定着装置1でシートSが詰まることを防ぐことができる。   As shown in FIG. 4, the heating member 72 has a thin film or belt shape, and is formed in a sleeve shape or a cylindrical shape. The heating member 72 in this embodiment can have a thickness of about 30 μm, for example. For the heating member 72, for example, SUS (stainless steel) can be used in view of heat capacity, strength, heat resistance, wear resistance, and the like. For the heating member 72, not only a metal but also a resin such as polyimide can be used. Further, the surface (circumferential surface) of the heating member 72 may have a release layer whose release property is enhanced by a fluororesin or the like. Accordingly, the sheet S can be prevented from sticking to the heating member 72 due to the adhesiveness of the toner melted and fixed by the sheet S that has passed through the nip, and the sheet S can be prevented from being clogged by the fixing device 1. Can do.

本実施形態では、前記発熱源77は、加熱部材72内に、加熱部材72の軸線方向に沿って2本設けられている。この発熱源77は、加熱部材72を暖めるためのものである。そして、発熱源77には、例えば輻射発熱源を用いることが可能であり、ハロゲンランプを用いることが可能である。尚、発熱源77としては、ハロゲンランプに限られるものではなく、公知のものを用いることが可能であり、加熱部材72を暖めることができるものであればよい。この発熱源77による輻射熱等により、薄肉に形成された加熱部材72はトナーを溶融させるのに必要な200°C程度まで急速に暖められる。   In the present embodiment, two heating sources 77 are provided in the heating member 72 along the axial direction of the heating member 72. The heat source 77 is for heating the heating member 72. As the heat source 77, for example, a radiation heat source can be used, and a halogen lamp can be used. The heat source 77 is not limited to a halogen lamp, and a known one can be used as long as it can warm the heating member 72. Due to the radiant heat generated by the heat source 77, the thin heating member 72 is rapidly heated to about 200 ° C. necessary for melting the toner.

前記加圧部材73は、加熱部材72と圧接するようにして設けられる。例えば、加圧部材73は表面がフッ素樹脂等により離型性を高められた離型層を有する円筒状のゴムにより形成される。そして、加圧部材73が加熱部材72に圧接されることで、加圧部材73と加熱部材72との間でニップが形成される。このニップにトナー像が転写されたシートSを通過させることで、シートSを加熱部材72により加熱し、加圧部材73により加圧する。これにより、シートS上のトナーが溶融し、シートSに定着される。   The pressure member 73 is provided so as to be in pressure contact with the heating member 72. For example, the pressure member 73 is formed of a cylindrical rubber having a release layer whose surface has a release property enhanced by a fluororesin or the like. Then, when the pressure member 73 is pressed against the heating member 72, a nip is formed between the pressure member 73 and the heating member 72. By passing the sheet S on which the toner image is transferred to the nip, the sheet S is heated by the heating member 72 and pressurized by the pressure member 73. As a result, the toner on the sheet S is melted and fixed on the sheet S.

図4に示すように、前記受圧部材74は、加熱部材72の内側で、加熱部材72の軸線方向に伸びて形成されていて、加熱部材72と加圧部材73のニップにおいて加圧部材73の圧力を受けるためのものであり、加熱部材72と接して設けられる。即ち、受圧部材74は、加熱部材72を介し、加圧部材73とニップを形成しているといえる。受圧部材74は圧力を受け止めるため一定の強度が必要であり、例えば、SUS(ステンレス鋼)を用いることができる。又、受圧部材74は、摺動する加熱部材72と接しているから熱容量、強度、耐熱性だけでなく、耐摩耗性にも優れたものである必要がある。尚、上記条件を備えるならば、樹脂を用いることも可能である。   As shown in FIG. 4, the pressure receiving member 74 is formed inside the heating member 72 and extends in the axial direction of the heating member 72, and the pressure member 73 is formed at the nip between the heating member 72 and the pressure member 73. It is for receiving pressure and is provided in contact with the heating member 72. That is, it can be said that the pressure receiving member 74 forms a nip with the pressure member 73 via the heating member 72. The pressure receiving member 74 needs to have a certain strength to receive pressure, and for example, SUS (stainless steel) can be used. Further, since the pressure receiving member 74 is in contact with the sliding heating member 72, it is necessary to have not only heat capacity, strength and heat resistance but also excellent wear resistance. In addition, if it has the said conditions, it is also possible to use resin.

ここで、受圧部材74の具体的な形状をみると、受圧部材74は、図4において、断面が略C字状となっており、加熱部材72と接触する接触面部74aとこれに対し略垂直な2つの側壁部74bを有している。そして、接触面部74aと側壁部74bをつなぐ接続面74cが形成されていてC面を形成している。このC面を有することで、加熱部材72の摺動が滑らかになる。   Here, looking at the specific shape of the pressure receiving member 74, the pressure receiving member 74 has a substantially C-shaped cross section in FIG. 4 and is substantially perpendicular to the contact surface portion 74 a that contacts the heating member 72. There are two side walls 74b. And the connection surface 74c which connects the contact surface part 74a and the side wall part 74b is formed, and the C surface is formed. By having this C surface, sliding of the heating member 72 becomes smooth.

前記補強部材76は、受圧部材74が加圧部材73から受ける圧力を受け止めるため、即ち、受圧部材74を補助、補強するために設けられている。補強部材76は、断面が略T字状に形成されていて、T字における頭部が受圧部材74の接触面部74aに突き当てられている。   The reinforcing member 76 is provided to receive the pressure received by the pressure receiving member 74 from the pressing member 73, that is, to assist and reinforce the pressure receiving member 74. The reinforcing member 76 has a substantially T-shaped cross section, and the head of the T-shape is abutted against the contact surface portion 74 a of the pressure receiving member 74.

この補強部材76を設けることにより、受圧部材74が単独で加圧部材73からの圧力を受ける場合に比べ、受圧部材74を薄くすることができ、従来に比べ受圧部材74の熱容量を下げることができる。従って、画像形成装置2のウォームアップ時の加熱部材72の温度上昇や、連続して定着を行った場合の加熱部材72の温度維持を妨げることがなくなる。即ち、受圧部材74が加熱部材72から熱を奪わない。又、補強部材76を受圧部材74に突き当てるから、補強部材76自体も薄くしても加圧部材73からの圧力を十分に受け止めることができ、受圧部材74のみ設け、かつ分厚く形成する場合よりも、同様の強度を有しつつ熱容量を下げることができる。   By providing this reinforcing member 76, the pressure receiving member 74 can be made thinner compared to the case where the pressure receiving member 74 receives pressure from the pressure member 73 alone, and the heat capacity of the pressure receiving member 74 can be reduced compared to the conventional case. it can. Therefore, the temperature rise of the heating member 72 during the warm-up of the image forming apparatus 2 and the maintenance of the temperature of the heating member 72 when performing continuous fixing are prevented. That is, the pressure receiving member 74 does not remove heat from the heating member 72. In addition, since the reinforcing member 76 is abutted against the pressure receiving member 74, the pressure from the pressure member 73 can be sufficiently received even if the reinforcing member 76 itself is thinned, compared to the case where only the pressure receiving member 74 is provided and formed thick. However, the heat capacity can be lowered while having the same strength.

前記固定部材75は、受圧部材74と補強部材76の位置を固定するためのものである。受圧部材74及び補強部材76は、その長手方向における両端を両側から挟み込まれるようにして、固定部材75に嵌め合わされる。そして、固定部材75は定着装置1の筐体71と結合され、これにより受圧部材74及び補強部材76の定着装置1内での位置が強固に固定される。   The fixing member 75 is for fixing the positions of the pressure receiving member 74 and the reinforcing member 76. The pressure receiving member 74 and the reinforcing member 76 are fitted to the fixing member 75 so that both ends in the longitudinal direction are sandwiched from both sides. The fixing member 75 is coupled to the casing 71 of the fixing device 1, whereby the positions of the pressure receiving member 74 and the reinforcing member 76 in the fixing device 1 are firmly fixed.

そして、図4に示すように、固定部材75は、加熱部材72の軸線方向に2つの側面部75aを有している。固定部材75に受圧部材74を嵌め合わす場合には、受圧部材74の弾性を利用する。具体的には、受圧部材74の2つの側壁部74bの距離が近づくようにして、受圧部材74を内側に弾性変形させつつ固定部材75に嵌め合わせる。このように、固定部材75の側面部75aと受圧部材74の側壁部74bの軸線方向における面が接することで、固定部材75が側壁部74bの弾性力を受け止めるようになっている。言い換えると、固定部材75が受圧部材74に覆い被さるようにして、固定部材75の側面部75aの内側と受圧部材74の側壁部74bの外側が接するように嵌め合わされる。   As shown in FIG. 4, the fixing member 75 has two side surface portions 75 a in the axial direction of the heating member 72. When the pressure receiving member 74 is fitted to the fixing member 75, the elasticity of the pressure receiving member 74 is used. Specifically, the pressure receiving member 74 is fitted into the fixing member 75 while being elastically deformed inward so that the distance between the two side wall portions 74b of the pressure receiving member 74 approaches. Thus, the fixing member 75 receives the elastic force of the side wall portion 74b when the side surface portion 75a of the fixing member 75 and the surface in the axial direction of the side wall portion 74b of the pressure receiving member 74 are in contact with each other. In other words, the fixing member 75 is fitted over the pressure receiving member 74 so that the inside of the side surface portion 75a of the fixing member 75 and the outside of the side wall portion 74b of the pressure receiving member 74 are in contact with each other.

このように、受圧部材74の弾性を利用することで、固定部材75に受圧部材74が嵌め込まれた状態では、受圧部材74の側壁部74bが開こうとし、これを固定部材75が受け止めるから受圧部材74と固定部材75の嵌め合わせが強固になされ、受圧部材74は、固定されるべき正規位置から容易に移動できないものとなる。   In this way, by utilizing the elasticity of the pressure receiving member 74, the side wall portion 74 b of the pressure receiving member 74 tries to open in a state where the pressure receiving member 74 is fitted in the fixing member 75, and the pressure receiving member 74 receives the pressure. The member 74 and the fixing member 75 are firmly fitted together, and the pressure receiving member 74 cannot be easily moved from the normal position to be fixed.

更に、固定部材75は、補強部材76を支持固定するものである。そのため、固定部材75は、図4において垂直な方向に固定部材75の一端から途中まで溝部75bを有している(図2及び図3参照)。補強部材76を受圧部材74に突き当てた状態で溝部75bに差し込んでいくと、固定部材75により補強部材76の位置が的確に固定されることになる。これにより、補強部材76が受圧部材74を押さえつけるように構成でき、加熱部材72と加圧部材73のニップにおける圧力を一定以上とすることができ、定着不良やシートSの搬送不良を回避できる。   Further, the fixing member 75 supports and fixes the reinforcing member 76. Therefore, the fixing member 75 has a groove part 75b from one end of the fixing member 75 to the middle in the direction perpendicular to FIG. 4 (see FIGS. 2 and 3). When the reinforcing member 76 is inserted into the groove portion 75 b in a state where it abuts against the pressure receiving member 74, the position of the reinforcing member 76 is accurately fixed by the fixing member 75. Accordingly, the reinforcing member 76 can be configured to press the pressure receiving member 74, the pressure in the nip between the heating member 72 and the pressure member 73 can be set to a certain level or more, and a fixing failure or a sheet S conveyance failure can be avoided.

ここで、本実施形態における熱膨張について述べる。定着装置1が発熱源77により暖められると、一般的には、受圧部材74も当然熱の影響を受けて、熱で膨張する。受圧部材74は上述の通り、加圧部材73からの圧力を受け、加圧部材73と加熱部材72の間でのニップを事実上形成している。そのため、受圧部材74が熱膨張により膨らんだり、歪んだり、捻れたり、変形すると、加熱部材72に皺が生じたり、加熱部材72の回転が捻れてしまったりして、定着が均等になされないことによる定着不良や、加熱部材72がスラスト方向への移動(蛇行)が生じ、加熱部材72に傷が入ることがある。   Here, thermal expansion in the present embodiment will be described. When the fixing device 1 is warmed by the heat source 77, the pressure receiving member 74 is naturally affected by heat and expands by heat. As described above, the pressure receiving member 74 receives pressure from the pressure member 73 and effectively forms a nip between the pressure member 73 and the heating member 72. Therefore, if the pressure receiving member 74 is expanded, distorted, twisted or deformed due to thermal expansion, the heating member 72 is wrinkled or the heating member 72 is twisted, and the fixing is not evenly performed. Due to the fixing failure, the heating member 72 may move (meander) in the thrust direction, and the heating member 72 may be damaged.

しかし、本実施形態にあっては、固定部材75の側面部75a内側が受圧部材74の側壁部74bからの弾性力を受け止めるようになっているから、受圧部材74が熱膨張により歪み、変形等しようとしても、受圧部材74に対して、固定されるべき元の正規位置に押し戻そうとする力が働く。即ち、受圧部材74の側壁部74bの有する弾性力が、熱膨張を押さえ込み、応力が働くことで、加熱部材72と加圧部材73のニップにおける圧力の変化を減少させ均等なものとする。これにより、定着不良がなくなり、加熱部材72の傷も生じないから定着装置1の寿命も長くなり、ニップを通過するシートSの搬送においても斜行や詰まりの原因が解消される。   However, in the present embodiment, the inside of the side surface portion 75a of the fixing member 75 receives the elastic force from the side wall portion 74b of the pressure receiving member 74. Therefore, the pressure receiving member 74 is distorted or deformed by thermal expansion. Even if it tries to do, the force which tries to push back to the original normal position which should be fixed acts on the pressure receiving member 74. In other words, the elastic force of the side wall portion 74b of the pressure receiving member 74 suppresses thermal expansion, and stress acts to reduce the pressure change at the nip between the heating member 72 and the pressure member 73 to be equal. As a result, the fixing failure is eliminated and the heating member 72 is not damaged, so that the life of the fixing device 1 is extended, and the cause of skewing and clogging is eliminated even in the conveyance of the sheet S passing through the nip.

更に、本実施形態では受圧部材74を補強部材76が押さえ込んでいるから、この補強部材76によっても受圧部材74の変形等を抑えることが可能である。   Further, in the present embodiment, since the pressure receiving member 74 is pressed by the reinforcing member 76, the deformation of the pressure receiving member 74 can be suppressed by the reinforcing member 76.

次に、図5に基づき、本発明の実施形態に係る受圧部材74の側壁部74bの具体的な構成について説明する。図5は、本発明の実施形態に係る受圧部材74の一端部における斜視図である。尚、図5では、説明の便宜のため、加圧部材73、受圧部材74、補強部材76以外の構成を省略している。 Next, based on FIG. 5, the specific structure of the side wall part 74b of the pressure receiving member 74 which concerns on embodiment of this invention is demonstrated. FIG. 5 is a perspective view of one end portion of the pressure receiving member 74 according to the embodiment of the present invention. In FIG. 5, the configuration other than the pressure member 73, the pressure receiving member 74, and the reinforcing member 76 is omitted for convenience of explanation.

本実施形態における受圧部材74の側壁部74bは、加熱部材72の軸線方向にわたって受圧部材74に一面に形成されているのではなく、受圧部材74の長手方向端部から所定の長さで側壁部74bが設けられる。具体的には、側壁部74bは、加熱部材72のシート通過領域F外に設けるようにすればよい(図2、図3、図5、図6において、シート通過領域Fを2点鎖線で図示)。   The side wall portion 74b of the pressure receiving member 74 in the present embodiment is not formed on the pressure receiving member 74 over the entire axial direction of the heating member 72, but has a predetermined length from the longitudinal end portion of the pressure receiving member 74. 74b is provided. Specifically, the side wall portion 74b may be provided outside the sheet passing area F of the heating member 72 (in FIGS. 2, 3, 5, and 6, the sheet passing area F is illustrated by a two-dot chain line. ).

このように形成する理由は、受圧部材74の熱容量を小さくするためである。側壁部74bを受圧部材74の長手方向の全長にわたって設けると、例えばハロゲンヒータを使用した場合、受圧部材74も少なからず輻射熱を奪うものとなる。しかし、図5に示すように、側壁部74bの長さを受圧部材74の長手方向端部から所定の長さに止めることで、加熱部材72を暖めるべき熱を奪わない。従って、定着装置1のウォーミングアップ時間を短縮することが可能であり、連続して定着を行っても加熱部材72と加圧部材73のニップ部における温度低下を無くすことが可能となる。   The reason for forming in this way is to reduce the heat capacity of the pressure receiving member 74. When the side wall portion 74b is provided over the entire length in the longitudinal direction of the pressure receiving member 74, for example, when a halogen heater is used, the pressure receiving member 74 takes a little radiant heat. However, as shown in FIG. 5, by stopping the length of the side wall portion 74 b from the longitudinal end portion of the pressure receiving member 74 to a predetermined length, the heating member 72 is not deprived of heat to be heated. Therefore, it is possible to shorten the warm-up time of the fixing device 1 and to eliminate the temperature drop at the nip portion of the heating member 72 and the pressure member 73 even if the fixing is performed continuously.

次に、図6に基づき、参考例としての受圧部材74の側壁部74bの具体的な構成について説明する。参考例は、実施形態と受圧部材74の側壁部74bの設け方について、差異を設けたものである。又、図6は、本発明の参考例に係る受圧部材74の一端部における斜視図である。尚、図6では、説明の便宜のため、加圧部材73、受圧部材74、補強部材76以外の構成を省略している。 Next, based on FIG. 6, the specific structure of the side wall part 74b of the pressure receiving member 74 as a reference example is demonstrated. In the reference example , a difference is provided between the embodiment and the method of providing the side wall portion 74b of the pressure receiving member 74. FIG. 6 is a perspective view of one end portion of the pressure receiving member 74 according to the reference example of the present invention. In FIG. 6, the configuration other than the pressing member 73, the pressure receiving member 74, and the reinforcing member 76 is omitted for convenience of explanation.

尚、参考例の基本的な構成は、図1〜5を用いて説明した上記の実施形態と同じであるから、上記の実施形態と共通する構成については、図面の記載及び説明を省略する。即ち、受圧部材74の側壁部74bの形状に差異を有するが、その差異以外の点については図1〜4を用いて説明した実施形態と同様にすればよい。 Since the basic configuration of the reference example is the same as that of the above-described embodiment described with reference to FIGS. 1 to 5, the description and description of the drawings are omitted for the configuration common to the above-described embodiment. That is, although there is a difference in the shape of the side wall 74b of the pressure receiving member 74, the points other than the difference may be the same as in the embodiment described with reference to FIGS.

本参考例における受圧部材74の側壁部74bは、加熱部材72の軸線方向にわたって受圧部材74に一面に形成されているものである。言い換えると、受圧部材74の長手方向端部から端部まで側壁部74bが設けられる。   The side wall portion 74 b of the pressure receiving member 74 in this reference example is formed on one surface of the pressure receiving member 74 over the axial direction of the heating member 72. In other words, the side wall portion 74 b is provided from the longitudinal end portion to the end portion of the pressure receiving member 74.

このように形成すると受圧部材74の熱容量は大きくなるものの、受圧部材74の側壁部74bの有する弾性により、受圧部材74が強固に位置固定されるとともに、熱膨張によって受圧部材74に歪み、捻れが生じても、受圧部材74は、固定されるべき正規の位置を確実に維持する。従って、定着不良やシートSの搬送不良を無くすことが可能となる。 Although the heat capacity of the pressure receiving member 74 increases as a result of this formation, the pressure receiving member 74 is firmly fixed by the elasticity of the side wall portion 74b of the pressure receiving member 74, and the pressure receiving member 74 is distorted and twisted by thermal expansion. Even if it occurs, the pressure receiving member 74 reliably maintains the normal position to be fixed. Therefore, it is possible to eliminate the conveyance failure of fixing failure and sheet S and that Do.

このようにして、スリーブ形状であって、回転可能となっている加熱部材72と、加熱部材72内に配された発熱源77と、加熱・加圧するためシートSを通過させるニップを形成するように加熱部材72と圧接されるとともに回転駆動する加圧部材73と、加熱部材72と加圧部材73が形成するニップにおいて加圧部材73の圧力を受けるため加熱部材72の内側に加熱部材72と接して設けられる受圧部材74と、受圧部材74の位置を固定するための固定部材75を備えた定着装置1において、受圧部材74は、加熱部材72の軸線方向に沿うように側壁部74bを備えるとともに、弾性変形されながら固定部材75に固定され、固定部材75は、側壁部74bの長手方向における面が、固定部材75と接することで、側壁部74bの弾性力を受け止めるようにすれば、受圧部材74は、弾性変形されながら固定部材75に固定されるから、受圧部材74が強固に固定され、受圧部材74が固定されるべき正規位置から移動し難いものとでき、又、受圧部材74の位置決めが容易となる。   In this way, a heating member 72 that is sleeve-shaped and rotatable, a heat generation source 77 arranged in the heating member 72, and a nip through which the sheet S passes for heating and pressurization are formed. A pressure member 73 that is in pressure contact with the heating member 72 and rotationally driven, and the pressure of the pressure member 73 is received at the nip formed by the heating member 72 and the pressure member 73. In the fixing device 1 including the pressure receiving member 74 provided in contact with the fixing member 75 for fixing the position of the pressure receiving member 74, the pressure receiving member 74 includes a side wall portion 74 b along the axial direction of the heating member 72. At the same time, the fixing member 75 is fixed to the fixing member 75 while being elastically deformed, and the side surface 74b of the fixing member 75 is in contact with the fixing member 75 in the longitudinal direction of the side wall portion 74b. If the elastic force is received, the pressure receiving member 74 is fixed to the fixing member 75 while being elastically deformed. Therefore, the pressure receiving member 74 is firmly fixed and hardly moves from the normal position where the pressure receiving member 74 should be fixed. In addition, the pressure receiving member 74 can be easily positioned.

更に、固定部材75は、受圧部材74の側壁部74bの軸線方向における面が、固定部材75と接することで、側壁部74bの弾性力を受け止める。これにより、定着装置1が暖められることで受圧部材74が熱で膨張し、受圧部材74に歪み、ねじれ、膨らみ等の変形が生じ、受圧部材74が固定されるべき正規の位置から移動しようとしても、固定部材75に押し当てられた側壁部74bが変形し、一定以上には受圧部材74が正規位置から移動しないようにするとともに、受圧部材74が正規位置に戻るように押し戻す。即ち、側壁部74bの弾性力で受圧部材74の熱膨張による歪み等の変形が吸収され、受圧部材74は正規位置を維持する。   Further, the fixing member 75 receives the elastic force of the side wall portion 74 b when the surface in the axial direction of the side wall portion 74 b of the pressure receiving member 74 is in contact with the fixing member 75. As a result, the pressure receiving member 74 expands due to heat as the fixing device 1 is warmed, and the pressure receiving member 74 is distorted, twisted, swelled, or the like, so that the pressure receiving member 74 is about to move from a proper position to be fixed. In addition, the side wall portion 74b pressed against the fixing member 75 is deformed, and the pressure receiving member 74 is prevented from moving from the normal position beyond a certain level, and the pressure receiving member 74 is pushed back so as to return to the normal position. That is, deformation such as distortion due to thermal expansion of the pressure receiving member 74 is absorbed by the elastic force of the side wall portion 74b, and the pressure receiving member 74 maintains the normal position.

従って、受圧部材74の熱膨張による加熱部材72の回転の歪み発生が防がれる。そうすると、加熱部材72における皺や傷が生じなくなることで、定着不良がなくなり、又、加熱部材72、定着装置1の長寿命化を図ることができる。又、加熱部材72と加圧部材73のニップにおける圧力の不均衡もなくなるからシートSの搬送不良も防ぐことができる。   Therefore, the occurrence of rotation distortion of the heating member 72 due to the thermal expansion of the pressure receiving member 74 is prevented. As a result, no flaws or scratches are generated in the heating member 72, so that fixing defects are eliminated, and the life of the heating member 72 and the fixing device 1 can be extended. Further, since there is no pressure imbalance in the nip between the heating member 72 and the pressure member 73, the conveyance failure of the sheet S can be prevented.

又、加熱部材72と加圧部材73が形成するニップ部分において、加熱部材72内に、受圧部材74よりも内側であって、受圧部材74と接し加圧部材73の圧力を受け止めるための補強部材76を設けるようにすれば、加圧部材73から加熱部材72への圧力を受圧部材74だけで受けなくてもよくなり、受圧部材74の強度を下げることが可能となる。即ち、受圧部材74の大きさを小さく、厚さを薄くすることができ、受圧部材74の熱容量を従来よりも小さくすることができる。従って、受圧部材74に熱を奪われることを少なくでき、定着装置1を暖めるためのウォーミングアップ時間を短縮することができ、高速で連続して定着を行っても、定着不良の発生を防ぐことができる。   Further, in the nip portion formed by the heating member 72 and the pressure member 73, the reinforcing member is inside the heating member 72 and inside the pressure receiving member 74 and is in contact with the pressure receiving member 74 and receives the pressure of the pressure member 73. If 76 is provided, the pressure from the pressure member 73 to the heating member 72 need not be received only by the pressure receiving member 74, and the strength of the pressure receiving member 74 can be reduced. That is, the pressure receiving member 74 can be reduced in size and thickness, and the heat capacity of the pressure receiving member 74 can be reduced as compared with the conventional case. Therefore, the pressure receiving member 74 can be less likely to be deprived of heat, the warm-up time for warming the fixing device 1 can be shortened, and the occurrence of fixing failure can be prevented even when fixing is performed continuously at high speed. it can.

又、側壁部74bは、加熱部材72のシート通過領域F外に設けられるようにすれば、側壁部74bは、加熱部材72のシート通過領域F外に設けるから、シート通過領域Fにおける受圧部材74の熱容量を小さくでき、側壁部74bが発熱源77からの熱を吸収し、又、加熱部材72の熱を奪い難いものとできる。従って、定着装置1を暖めるためのウォーミングアップ時間を短縮することができ、高速で連続して定着を行っても、定着不良の発生を防ぐことができる。   Further, if the side wall part 74 b is provided outside the sheet passing area F of the heating member 72, the side wall part 74 b is provided outside the sheet passing area F of the heating member 72. The side wall portion 74b absorbs heat from the heat source 77, and the heating member 72 can hardly be deprived of heat. Therefore, the warm-up time for warming the fixing device 1 can be shortened, and the occurrence of defective fixing can be prevented even when fixing is performed continuously at a high speed.

又、画像形成装置2において、上記いずれかの定着装置1を備えるようにすれば、定着不良がない画像形成装置2が提供され、形成される画像の品質が高く、安定する。又、定着装置1を通過したシートSに皺が入ることや、シートSが詰まってしまうようなシートSの搬送不良のない画像形成装置2を提供できる。又、定着装置1を暖めるための時間を短縮でき使用者の利便性が向上した画像形成装置2を提供できる。   If the image forming apparatus 2 is provided with any one of the fixing devices 1 described above, the image forming device 2 free from fixing defects is provided, and the quality of the formed image is high and stable. In addition, it is possible to provide the image forming apparatus 2 that does not cause defects in conveyance of the sheet S such that wrinkles enter the sheet S that has passed through the fixing device 1 or the sheet S is jammed. In addition, it is possible to provide the image forming apparatus 2 in which the time for warming the fixing device 1 can be shortened and the convenience for the user is improved.

以上、本発明の実施形態につき説明したが、本発明の範囲はこれに限定されるものではなく、発明の主旨を逸脱しない範囲で種々の変更を加えて実施することができる。   Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the invention.

本発明は、画像形成装置における定着装置及びこれを用いた画像形成装置において利用可能である。   The present invention can be used in a fixing device in an image forming apparatus and an image forming apparatus using the same.

本発明の実施形態に係る画像形成装置の概略構成を示す正面から見た模型的断面図である。1 is a schematic cross-sectional view seen from the front showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention. 本発明の実施形態に係る定着装置の斜視図である。1 is a perspective view of a fixing device according to an embodiment of the present invention. 本発明の実施形態に係る定着装置の一端部での拡大斜視図である。FIG. 3 is an enlarged perspective view of one end portion of the fixing device according to the embodiment of the present invention. 本発明の実施形態に係る定着装置の断面図である。1 is a cross-sectional view of a fixing device according to an embodiment of the present invention. 本発明の実施形態に係る受圧部材の一端部における斜視図である。It is a perspective view in the one end part of the pressure receiving member which concerns on embodiment of this invention. 本発明の参考例に係る受圧部材の一端部における斜視図である。It is a perspective view in the one end part of the pressure receiving member which concerns on the reference example of this invention.

1 定着装置
2 画像形成装置
72 加熱部材
73 加圧部材
74 受圧部材
74b 側壁部(受圧部材74)
75 固定部材
76 補強部材
77 発熱源
F シート通過領域
DESCRIPTION OF SYMBOLS 1 Fixing device 2 Image forming apparatus 72 Heating member 73 Pressure member 74 Pressure receiving member 74b Side wall part (pressure receiving member 74)
75 Fixing member 76 Reinforcing member 77 Heat source F Sheet passing area

Claims (4)

スリーブ形状であって、回転可能となっている加熱部材と、前記加熱部材内に配され、輻射発熱源である発熱源と、加熱・加圧するためシートを通過させるニップを形成するように前記加熱部材と圧接されるとともに回転駆動する加圧部材と、前記加熱部材と前記加圧部材が形成するニップにおいて前記加圧部材の圧力を受けるため前記加熱部材の内側に前記加熱部材と接して設けられ、前記発熱源と接さない受圧部材と、前記受圧部材の位置を固定するための固定部材を備えた定着装置において、
前記受圧部材は、前記加熱部材の軸線方向に沿うように側壁部を備えるとともに、弾性変形されながら前記固定部材に固定され、
前記固定部材は、前記側壁部の長手方向における面が、前記固定部材と接することで、前記側壁部の弾性力を受け止め、
前記側壁部は、前記加熱部材の軸線方向にわたって前記受圧部材に一面に形成されず前記受圧部材の長手方向端部から所定の長さで設けられることを特徴とする定着装置。
A heating member that is sleeve-shaped and rotatable, a heating source that is disposed in the heating member and that is a radiant heat source, and a nip through which the sheet passes for heating and pressurization are formed. A pressure member that is in pressure contact with the member and rotationally driven, and is provided in contact with the heating member inside the heating member to receive the pressure of the pressure member in a nip formed by the heating member and the pressure member. A fixing device including a pressure receiving member that is not in contact with the heat generation source and a fixing member for fixing a position of the pressure receiving member;
The pressure receiving member includes a side wall portion along the axial direction of the heating member, and is fixed to the fixing member while being elastically deformed.
The fixing member, the surface in the longitudinal direction of the side wall portion, said that contact with the fixing member, and stopper receiving the elastic force of the side wall portion,
The fixing device according to claim 1, wherein the side wall portion is not formed on one surface of the pressure receiving member over the axial direction of the heating member and is provided with a predetermined length from an end portion in the longitudinal direction of the pressure receiving member.
前記加熱部材と前記加圧部材が形成するニップ部分において、前記加熱部材内に、前記受圧部材よりも内側であって、前記受圧部材と接し前記加圧部材の圧力を受け止めるための補強部材を設けていることを特徴とする請求項1記載の定着装置。   In the nip portion formed by the heating member and the pressure member, a reinforcing member is provided in the heating member, inside the pressure receiving member, for contacting the pressure receiving member and receiving the pressure of the pressure member. The fixing device according to claim 1, wherein the fixing device is provided. 前記側壁部は、前記加熱部材のシート通過領域外に設けられていることを特徴とする請求項1又は2記載の定着装置。   The fixing device according to claim 1, wherein the side wall portion is provided outside a sheet passing region of the heating member. 前記請求項1乃至3のいずれか1項に記載の定着装置を備えたことを特徴とする画像形成装置。   An image forming apparatus comprising the fixing device according to claim 1.
JP2006302746A 2006-11-08 2006-11-08 Fixing device and image forming apparatus having the same Expired - Fee Related JP4877965B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006302746A JP4877965B2 (en) 2006-11-08 2006-11-08 Fixing device and image forming apparatus having the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2006302746A JP4877965B2 (en) 2006-11-08 2006-11-08 Fixing device and image forming apparatus having the same

Publications (2)

Publication Number Publication Date
JP2008122438A JP2008122438A (en) 2008-05-29
JP4877965B2 true JP4877965B2 (en) 2012-02-15

Family

ID=39507289

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2006302746A Expired - Fee Related JP4877965B2 (en) 2006-11-08 2006-11-08 Fixing device and image forming apparatus having the same

Country Status (1)

Country Link
JP (1) JP4877965B2 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3124375B2 (en) * 1992-06-16 2001-01-15 キヤノン株式会社 Heating equipment
JP2005043741A (en) * 2003-07-24 2005-02-17 Canon Inc Image fixing device

Also Published As

Publication number Publication date
JP2008122438A (en) 2008-05-29

Similar Documents

Publication Publication Date Title
JP5060315B2 (en) Fixing device and image forming apparatus having the same
JP4280664B2 (en) Image heating device
JP5173464B2 (en) Image forming apparatus
JP2008139382A (en) Fixing device, and image forming apparatus with the same
JP2011064767A (en) Fixing device and image forming apparatus
JP2008122795A (en) Image forming apparatus
JP2008122582A (en) Fixing device and image forming apparatus equipped with the same
JP2016038545A (en) Image forming apparatus
JP5135994B2 (en) Fixing device
JP6462204B2 (en) Fixing apparatus and image forming apparatus
JP2014056146A (en) Fixing device and image forming apparatus
JP2013120374A (en) Fixing device and image forming apparatus
JP4760296B2 (en) Fixing device and image forming apparatus using the same
JP2004151125A (en) Fixing device
JP6540030B2 (en) Image forming apparatus and image forming system
JP4877965B2 (en) Fixing device and image forming apparatus having the same
JP2018194655A (en) Conveying device and image forming apparatus
JP2012181402A (en) Fixing device and image forming apparatus
JP2011145334A (en) Fixing device and image forming apparatus
JP2009053294A (en) Fixing device and image forming apparatus
JP2004093842A (en) Heating device and image forming apparatus
JP6035222B2 (en) Fixing apparatus and image forming apparatus
JP4934350B2 (en) Fixing device, image forming apparatus
JP2012098654A (en) Multiple image forming apparatus
JP2013120378A (en) Fixing device and image forming apparatus

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20091023

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110906

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20111027

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20111122

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20111124

R150 Certificate of patent or registration of utility model

Ref document number: 4877965

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20141209

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20141209

Year of fee payment: 3

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20141209

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: R3D03

LAPS Cancellation because of no payment of annual fees