JP2011191450A - Recording material separating device of fixing device, fixing device, and image forming apparatus - Google Patents
Recording material separating device of fixing device, fixing device, and image forming apparatus Download PDFInfo
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- JP2011191450A JP2011191450A JP2010056794A JP2010056794A JP2011191450A JP 2011191450 A JP2011191450 A JP 2011191450A JP 2010056794 A JP2010056794 A JP 2010056794A JP 2010056794 A JP2010056794 A JP 2010056794A JP 2011191450 A JP2011191450 A JP 2011191450A
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Abstract
Description
本発明は、複写機、プリンタ等の画像形成装置などに備えられた定着装置の記録材分離装置と、これを用いた定着装置、及び画像形成装置に関する。 The present invention relates to a recording material separating device for a fixing device provided in an image forming apparatus such as a copying machine or a printer, a fixing device using the same, and an image forming apparatus.
複写機、プリンタ等の画像形成装置などに備えられた給紙装置、特にトレイに複数枚積載されている最上位の用紙を吸引ベルトによって吸着して画像形成部に給紙する給紙装置においては、最上位の用紙を分離する手段、装置を備えるのが一般的である。 In a paper feeding device provided in an image forming apparatus such as a copying machine or a printer, in particular, a paper feeding device that sucks a top sheet stacked on a tray by a suction belt and feeds it to an image forming unit. Generally, a means and a device for separating the uppermost sheet are provided.
そのような分離手段、装置のうちで、分離爪を用い、コロを分離爪の先端ギャップ出しのために設けた技術が知られている。この技術では、コロが定着ベルトまたはローラと接触しているために、オフセットトナーが定着ベルトまたはローラ上に発生した際に、トナーがコロ表面に付着する可能性がある。そして、コロにトナーが付着してしまった場合、さらに具体的には、分離爪ギャップを決定付けるコロの表面に経時でトナーが堆積した場合には、コロの外径が増加して分離爪先端ギャップが広がってしまい、一定のギャップを維持できなくなる、という可能性がある。 Among such separation means and devices, a technique is known in which a separation claw is used and a roller is provided for a gap at the tip of the separation claw. In this technique, since the roller is in contact with the fixing belt or roller, when the offset toner is generated on the fixing belt or roller, the toner may adhere to the surface of the roller. When toner adheres to the roller, more specifically, when toner accumulates over time on the surface of the roller that determines the separation claw gap, the outer diameter of the roller increases and the tip of the separation claw There is a possibility that the gap widens and it becomes impossible to maintain a certain gap.
そして、分離爪ギャップが広くなってしまうことで分離性能が低下するので、複写機、プリンタ等の画像形成装置などに備えられる給紙装置においては、これを回避しなければならないことはもちろんである。 In addition, since the separation performance is lowered due to the widening of the separation claw gap, it is a matter of course that this must be avoided in a paper feeding device provided in an image forming apparatus such as a copying machine or a printer. .
本発明は、この点にかんがみてなしたもので、ローラあるいはベルトに摺接したコロを有することで、ローラあるいはベルトの熱膨張に追従して分離爪先端とのギャップを経時でも高精度に維持することができるようにすることを目的とする。 The present invention has been made in view of this point, and has a roller slidably in contact with the roller or belt, so that the gap with the tip of the separation claw can be maintained with high accuracy over time by following the thermal expansion of the roller or belt. The purpose is to be able to.
本発明の定着装置の記録材分離装置のうち請求項１に係るものは、未定着トナーを記録材上に永久定着させるために、記録材およびトナーに熱と圧力を与えるニップ部を有し、該ニップ通過後に記録材を定着ローラあるいは定着ベルトあるいは加圧ローラから分離させるための分離手段を有する定着装置において、前記分離爪には、ローラもしくはベルトへ当接することで分離爪先端と該ローラもしくは該ベルトとの間にギャップを設けるコロを有し、該コロに摺接させたクリーニング機構を有することを特徴とする。 The recording material separating device of the fixing device according to the present invention includes a nip portion that applies heat and pressure to the recording material and the toner in order to permanently fix the unfixed toner on the recording material. In the fixing device having separation means for separating the recording material from the fixing roller, the fixing belt, or the pressure roller after passing through the nip, the separation claw is in contact with the roller or the belt so that the leading edge of the separation claw and the roller or belt It has a roller which provides a gap between the belt and a cleaning mechanism which is brought into sliding contact with the roller.
同請求項２に係るものは、請求項１に記載の定着装置の記録材分離装置において、前記コロに摺接する他のコロの一部分を前記記録材と接する前記分離爪の通紙側表面よりも突出させたことを特徴とする。 According to the second aspect of the present invention, there is provided a recording material separating apparatus for a fixing device according to the first aspect, wherein a part of another roller that is in sliding contact with the roller is more than a surface of the separation claw that is in contact with the recording material. It is made to protrude.
同請求項３に係るものは、請求項１に記載の定着装置の記録材分離装置において、前記コロに接して回転する拍車の一部分を前記記録材と接する前記分離爪の通紙側表面よりも突出させたことを特徴とする。 According to a third aspect of the present invention, there is provided a recording material separating apparatus for a fixing device according to the first aspect, wherein a part of a spur rotating in contact with the roller is more than a surface of the separation claw in contact with the recording material. It is made to protrude.
同請求項４に係るものは、請求項３に記載の定着装置の記録材分離装置において、前記拍車の軸が前記コロに摺接して前記拍車を駆動連結することを特徴とする。 According to a fourth aspect of the present invention, in the recording material separating apparatus of the fixing device according to the third aspect, the shaft of the spur is in sliding contact with the roller to drively connect the spur.
同請求項５に係るものは、請求項１から４のいずれかに記載の定着装置の記録材分離装置において、前記コロにクリーニングローラを摺接させたことを特徴とする。 According to a fifth aspect of the present invention, in the recording material separating apparatus for a fixing device according to any one of the first to fourth aspects, a cleaning roller is brought into sliding contact with the roller.
同請求項６に係るものは、請求項１から４のいずれかに記載の定着装置の記録材分離装置において、前記コロにクリーニングブレードを摺接させたことを特徴とする。 According to a sixth aspect of the present invention, in the recording material separating apparatus for a fixing device according to any one of the first to fourth aspects, a cleaning blade is brought into sliding contact with the roller.
同請求項７に係る定着装置は、請求項１から６のいずれかの定着装置の記録材分離装置を有することを特徴とする。 According to a seventh aspect of the present invention, there is provided a fixing device including the recording material separating device according to any one of the first to sixth aspects.
同請求項８に係る画像形成装置は、請求項７の定着装置を有することを特徴とする。 An image forming apparatus according to claim 8 includes the fixing device according to claim 7.
本発明によれば、コロにクリーニング機構が備わっているため、経時でコロ表面にトナーが堆積することによりコロ外径が増大して分離爪の先端ギャップが広くなることで分離性能が低下することを防ぐことが可能となる。 According to the present invention, since the roller is equipped with a cleaning mechanism, toner accumulates on the surface of the roller over time, so that the outer diameter of the roller increases and the tip gap of the separation claw widens, resulting in a decrease in separation performance. Can be prevented.
本発明の定着装置は、ローラあるいはベルトに摺接したコロを有する。このコロは、ローラあるいはベルトの熱膨張に追従し、分離爪先端とのギャップを経時でも高精度に維持する。 The fixing device of the present invention has a roller that is in sliding contact with a roller or a belt. This roller follows the thermal expansion of the roller or belt and maintains the gap with the tip of the separation claw with high accuracy over time.
図１０は、本発明に係る定着装置を採用し得る画像形成装置の一例であるタンデム型カラー複写機の全体構成を示す図である。この画像形成装置の内部構成の概要及び動作について説明する。 FIG. 10 is a diagram showing an overall configuration of a tandem color copying machine as an example of an image forming apparatus that can employ the fixing device according to the present invention. The outline and operation of the internal configuration of the image forming apparatus will be described.
図１０において、１０１は画像形成装置本体、１０２は入力画像情報に基づいたレーザ光を発する書込み部、１０３は原稿Ｄを原稿読込部１０４に搬送する原稿搬送部、１０４は原稿Ｄの画像情報を読み込む原稿読込部、７は転写紙等の記録材Ｐが収容される給紙部、９は記録材Ｐの搬送タイミングを調整するレジストローラ、１１Ｙ、１１Ｍ、１１Ｃ、１１ＢＫは各色（イエロー、マゼンタ、シアン、ブラック）のトナー像が形成される感光体ドラム、１２は各感光体ドラム１１Ｙ、１１Ｍ、１１Ｃ、１１ＢＫ上を帯電する帯電部、１３は各感光体ドラム１１Ｙ、１１Ｍ、１１Ｃ、１１ＢＫ上に形成される静電潜像を現像する現像部、１４は各感光体ドラム１１Ｙ、１１Ｍ、１１Ｃ、１１ＢＫ上に形成されたトナー像を記録材Ｐ上に重ねて転写する転写バイアスローラ（１次転写バイアスローラ）、１５は各感光体ドラム１１Ｙ、１１Ｍ、１１Ｃ、１１ＢＫ上の未転写トナーを回収するクリーニング部を示す。また、図中１６は中間転写ベルト１７を清掃する中間転写ベルトクリーニング部、１７は複数色のトナー像が重ねて転写される中間転写ベルト、１８は中間転写ベルト１７上のカラートナー像を記録材Ｐ上に転写するための２次転写バイアスローラ、２０は記録材Ｐ上のトナー像を定着する定着装置を示す。なお、図１１は、図１０の装置で採用可能なベルト定着方式の定着装置概略図、図１２は同じくローラ定着方式の定着装置概略図、図１３は同じくベルト加圧方式の定着装置概略図、そして図１４も同じくツインベルト方式（定着と加圧の両方にベルトを使用）の定着装置概略図であり、図中２０は定着装置、２１は定着ベルト、２２は定着ローラ、２３は加熱ローラ、２４は加圧ローラ、２５はガイド板、２６は加圧ベルト、２７は支持ローラ、３０は分離手段（分離爪）である。これらの要素については以下の実施例の説明において詳細に説明する。但し、説明の都合上、各部の符号が異なっている。なお図中Ｔはトナー、Ｐは記録材、Ｓ１、Ｓ２はサーミスタ、Ｈ１、Ｈ２はヒータ（赤外線ヒータやＩＨヒータ等）である。 In FIG. 10, 101 is an image forming apparatus main body, 102 is a writing unit that emits laser light based on input image information, 103 is a document conveying unit that conveys a document D to a document reading unit 104, and 104 is image information of the document D. A document reading unit to be read, 7 is a paper feed unit that accommodates a recording material P such as transfer paper, 9 is a registration roller that adjusts the conveyance timing of the recording material P, and 11Y, 11M, 11C, and 11BK are colors (yellow, magenta, Cyan and black) on which the toner image is formed, 12 is a charging unit for charging each of the photoconductor drums 11Y, 11M, 11C, and 11BK, and 13 is on each of the photoconductor drums 11Y, 11M, 11C, and 11BK. A developing unit 14 develops the formed electrostatic latent image, and superimposes the toner images formed on the photosensitive drums 11Y, 11M, 11C, and 11BK on the recording material P. Copy transfer bias roller (primary transfer bias roller), 15 denotes the photosensitive drums 11Y, 11M, 11C, a cleaning unit for collecting the untransferred toner on 11BK. In the figure, 16 is an intermediate transfer belt cleaning unit for cleaning the intermediate transfer belt 17, 17 is an intermediate transfer belt on which toner images of a plurality of colors are transferred in an overlapping manner, and 18 is a color toner image on the intermediate transfer belt 17. A secondary transfer bias roller 20 for transferring onto P is a fixing device for fixing the toner image on the recording material P. 11 is a schematic diagram of a fixing device of a belt fixing system that can be employed in the apparatus of FIG. 10, FIG. 12 is a schematic diagram of a fixing device of a roller fixing system, and FIG. 13 is a schematic diagram of a fixing device of a belt pressure system. FIG. 14 is also a schematic diagram of a fixing device of the twin belt system (a belt is used for both fixing and pressing), in which 20 is a fixing device, 21 is a fixing belt, 22 is a fixing roller, 23 is a heating roller, Reference numeral 24 is a pressure roller, 25 is a guide plate, 26 is a pressure belt, 27 is a support roller, and 30 is a separation means (separation claw). These elements will be described in detail in the following description of the embodiments. However, for convenience of explanation, the reference numerals of the respective parts are different. In the figure, T is a toner, P is a recording material, S1 and S2 are thermistors, and H1 and H2 are heaters (infrared heaters, IH heaters, etc.).
＜実施例１＞
既述のように、本発明は、ローラあるいはベルトに摺接したコロを有することで、ローラあるいはベルトの熱膨張に追従し分離爪先端とのギャップを経時でも高精度に維持しようとするものであり、その実施例を図１、図２に示す。
<Example 1>
As described above, the present invention has a roller slidably in contact with the roller or the belt, and follows the thermal expansion of the roller or the belt to maintain the gap with the tip of the separation claw with high accuracy over time. The embodiment is shown in FIGS.
図１において、１、２は定着ローラあるいは定着ベルトである。本発明においてはローラ定着方式、ベルト定着方式ともに適用することができる。また加圧ベルトあるいは加圧ローラ側に本発明の分離手段を適用することもできる。また図１においてはニップを形成する下側のローラあるいはベルト２に分離爪４が近接して設置されているが、この限りではなく、上側のローラあるいはベルト１に分離爪４を設置させても良いし、また上下両方に設置させても良い。ただし、以下では、説明を単純化するために、符号１、２に係るものをローラと称して説明する。なお図中Ｎはローラ１、２のニップ部である。 In FIG. 1, reference numerals 1 and 2 denote fixing rollers or fixing belts. In the present invention, both the roller fixing method and the belt fixing method can be applied. Also, the separating means of the present invention can be applied to the pressure belt or pressure roller side. In FIG. 1, the separation claw 4 is installed close to the lower roller or belt 2 forming the nip. However, the present invention is not limited to this, and the separation claw 4 may be installed on the upper roller or belt 1. It is good, and you may make it install in both upper and lower sides. However, in the following, in order to simplify the description, the components according to reference numerals 1 and 2 will be referred to as rollers. In the figure, N is the nip portion of the rollers 1 and 2.
分離爪４は、回転支点４ａを中心にスプリング６により可動する構成となっている。回転支点４ａを中心として一端にスプリングで荷重をかけるともう一端にある先端４ｂがローラ２に接触しようとする。しかし、コロ３により規制されて、分離爪４の先端４ｂとローラ２との間には常に一定ギャップが設けられている。またコロ３をローラ２に摺接させているため、ローラ２が熱膨張して外径が増加するように変化しても、分離爪４は回転支点４ａを中心に押し上げられ、分離爪４の先端４ｂの位置も動く。このためローラ２の外径変化に対して分離爪４の先端４ｂの位置を追従させることができ、ローラ２の表面とのギャップＧを常に精度良く維持することができる。 The separation claw 4 is configured to be movable by a spring 6 around a rotation fulcrum 4a. When a load is applied to one end with a spring around the rotation fulcrum 4a, the tip 4b at the other end tends to contact the roller 2. However, a constant gap is always provided between the tip 4 b of the separation claw 4 and the roller 2, which is regulated by the roller 3. Further, since the roller 3 is in sliding contact with the roller 2, even if the roller 2 is thermally expanded to change the outer diameter, the separation claw 4 is pushed up around the rotation fulcrum 4a. The position of the tip 4b also moves. Therefore, the position of the tip 4b of the separation claw 4 can be made to follow the change in the outer diameter of the roller 2, and the gap G with the surface of the roller 2 can always be maintained with high accuracy.
また、このコロ３の表面にオフセットトナーが堆積しないよう、クリーニング機構を設けてある。図１ではクリーニングローラ３１がコロ３に摺接している様子を示している。コロ３の表面に堆積したトナーはクリーニングローラ３１へと転移するので、常にコロ３の表面をきれいな状態に保ち得るようになっており、コロ３の外径が維持されるため、その結果として分離爪４の先端４とローラ２表面とのギャップＧは高精度に管理された状態に保たれる。そして、ギャップＧが広くなることで分離性能が低下することを防ぐことが可能となっている。 A cleaning mechanism is provided so that offset toner does not accumulate on the surface of the roller 3. FIG. 1 shows a state where the cleaning roller 31 is in sliding contact with the roller 3. Since the toner accumulated on the surface of the roller 3 is transferred to the cleaning roller 31, the surface of the roller 3 can always be kept clean, and the outer diameter of the roller 3 is maintained. The gap G between the tip 4 of the claw 4 and the surface of the roller 2 is maintained in a state managed with high accuracy. And it becomes possible to prevent that separation performance falls because gap G becomes wide.
＜実施例２＞
この実施例は、ローラ１または２に摺接させるコロ３に加え、もう一つコロを設け、これらのコロ３、５の少なくとも一方が従動回転するように構成することで、記録材（図中矢印Ｐで搬送による移動方向としても示してある）との線速差がほとんどなく、スムーズに記録材Ｐを搬送させて分離爪４の通紙側の表面４ｃによる擦れ跡などの異常画像発生を回避するようにしたものである。なお以下では、実施例１と共通する部分には共通する符号を付して、重複する説明は省略する。
<Example 2>
In this embodiment, in addition to the roller 3 slidably in contact with the roller 1 or 2, another roller is provided, and at least one of these rollers 3 and 5 is configured to be driven to rotate, thereby recording material (in the drawing) There is almost no difference in linear velocity with respect to the moving direction by the conveyance by the arrow P), and the recording material P is conveyed smoothly, and abnormal images such as rubbing traces by the surface 4c on the paper passing side of the separation claw 4 are generated. It is to avoid. In addition, below, the code | symbol which is common to Example 1 is attached | subjected, and the overlapping description is abbreviate | omitted.
本実施例の概略図を図２に示す。図示のように、コロ５の表面は分離爪４の通紙側の表面４ｃよりも記録材Ｐの搬送経路に突出させてある。分離爪４の表面４ｃに記録材Ｐが衝突しながら搬送される場合、分離爪４の表面４ｃにコーティングしたＰＦＡあるいはＰＴＦＥコーティングが経時で磨耗してしまったり、また分離爪４自身も経時で磨耗し、そこにトナーが堆積付着して記録材Ｐに擦れ跡を残すといった不具合が生じることがあったが、本実施例の構成であれば、ローラ２の回転に伴いコロ３も従動回転し、それに伴いコロ５も従動回転する。三者の間にスリップがないときには、記録材Ｐの搬送速度（線速）とコロ５の表面の移動速度が同速になるため、ニップを出た記録材がコロ５と接触しても擦れは起きず異常画像が発生しないので良好な画像品質を得られる。 A schematic diagram of this example is shown in FIG. As shown in the drawing, the surface of the roller 5 is projected from the surface 4 c of the separation claw 4 on the sheet passing side into the conveyance path of the recording material P. When the recording material P is conveyed while colliding with the surface 4c of the separation claw 4, the PFA or PTFE coating coated on the surface 4c of the separation claw 4 is worn over time, or the separation claw 4 itself is worn over time. However, there is a problem that toner accumulates on the recording material P and leaves a rubbing trace on the recording material P. However, according to the configuration of this embodiment, the roller 3 is driven to rotate as the roller 2 rotates. Along with this, the roller 5 is also rotated. When there is no slip among the three parties, the conveyance speed (linear speed) of the recording material P and the moving speed of the surface of the roller 5 are the same, so that even if the recording material exiting the nip comes into contact with the roller 5, it rubs. Does not occur and no abnormal image is generated, so that a good image quality can be obtained.
＜実施例３＞
この実施例は、コロ３に加え、コロ３に接した拍車５１をコロ３の回転に対して従動回転させることで、記録材Ｐとの線速差をほとんどなくし、スムーズに記録材Ｐを搬送させて分離爪４の通紙面側の表面４ｃによる擦れ跡に起因する異常画像を回避するようにしたものである。
<Example 3>
In this embodiment, in addition to the roller 3, the spur 51 in contact with the roller 3 is driven to rotate with respect to the rotation of the roller 3, so that almost no linear velocity difference from the recording material P is eliminated and the recording material P is smoothly conveyed. Thus, an abnormal image caused by a rubbing trace by the surface 4c on the sheet passing surface side of the separation claw 4 is avoided.
本実施例の概略図を図３に示す。拍車５１の一部分が分離爪４の通紙側の表面４ｃよりも突出している。ローラ２の回転にコロ３が従動回転し、それに伴って拍車５１も従動回転する（コロ３と拍車５１の軸５１ａが接している）ので、三者間にスリップがないときには記録材Ｐの搬送速度（線速）と拍車５１表面の速度が同速になるため、ローラ１、２のニップ部Ｎを出た記録材が拍車５１と接触しても擦れは起きず、したがって異常画像を発生させる可能性は非常に小さくなり、良好な画像品質を得られる。すなわち、先の実施例のコロ５よりも拍車５１のほうが記録材Ｐとの接触面積が低減するので、より擦れ跡の発生の可能性が低くなる。 A schematic diagram of this example is shown in FIG. A part of the spur 51 protrudes from the surface 4c of the separation claw 4 on the sheet passing side. The roller 3 is driven to rotate by the rotation of the roller 2, and the spur 51 is also driven to rotate (the roller 3 and the shaft 51a of the spur 51 are in contact with each other). Therefore, when there is no slip between the three, the recording material P is conveyed. Since the speed (linear speed) and the speed of the surface of the spur 51 are the same, even if the recording material exiting the nip portion N of the rollers 1 and 2 comes into contact with the spur 51, rubbing does not occur, and thus an abnormal image is generated. The possibilities are very small and good image quality can be obtained. That is, since the spur 51 has a smaller contact area with the recording material P than the roller 5 of the previous embodiment, the possibility of occurrence of rubbing traces is further reduced.
なお図示は省略するが、コロ３と拍車５１の軸５１ａとの間にスリップを生じさせないためには両者間に圧力を掛けていることが望ましく、圧力を掛ける方法としては、どちらかの軸部に圧縮スプリングやトーションスプリング、板バネ等の付勢手段を使用する方法が望ましい。 In addition, although illustration is abbreviate | omitted, in order not to produce a slip between the roller 3 and the axis | shaft 51a of the spur 51, it is desirable to apply pressure between both, and as a method of applying pressure, either shaft part It is desirable to use a biasing means such as a compression spring, a torsion spring, or a leaf spring.
＜実施例４＞
この実施例は、拍車５１に厚さの薄い拍車を用い、また拍車５１の駆動伝達部５ａをコロ３の駆動伝達部３ａに摺接させて、コロ３と拍車５１とを駆動連結することでコロ３の回転に従動回転させ、コロ３との間での駆動伝達不足によるスリップを生じさせないようにするものである。
<Example 4>
In this embodiment, a spur with a small thickness is used for the spur 51, and the drive transmission unit 5a of the spur 51 is brought into sliding contact with the drive transmission unit 3a of the roller 3, so that the roller 3 and the spur 51 are driven and connected. The roller 3 is rotated by the rotation of the roller 3 so that slip due to insufficient drive transmission with the roller 3 is prevented.
本実施例の概略図を図４、図５に示す。分離爪４は、ローラ２に摺接したコロ３及びそのコロ３にその軸部５ａが接した拍車５１を有する（図５参照）。本実施例の構成であれば、ローラ２の回転に伴ってコロ３が従動回転し、そのコロ３に駆動連結された拍車５１がコロ３の回転に伴って従動回転する。上述の構成のためにコロ３と拍車５１の間にスリップがないので、コロ３の周速度と拍車５１の周速度が同速であれば、ローラ２とコロ３との間にスリップが生じないときには、ニップ部Ｎを出た記録材Ｐが拍車５１と接触しても擦れは起きず、異常画像が非常に発生しにくくなるので、良好な画像品質を得られる。 A schematic diagram of this embodiment is shown in FIGS. The separation claw 4 includes a roller 3 slidably in contact with the roller 2 and a spur 51 in which the shaft portion 5a is in contact with the roller 3 (see FIG. 5). With the configuration of the present embodiment, the roller 3 is driven to rotate with the rotation of the roller 2, and the spur 51 that is drivingly connected to the roller 3 is driven to rotate with the rotation of the roller 3. Since there is no slip between the roller 3 and the spur 51 due to the above-described configuration, no slip occurs between the roller 2 and the roller 3 if the peripheral speed of the roller 3 and the peripheral speed of the spur 51 are the same. In some cases, even if the recording material P that has exited the nip portion N comes into contact with the spur 51, rubbing does not occur, and abnormal images are very unlikely to occur, so that good image quality can be obtained.
この実施例でもコロ３の駆動伝達部３ａと拍車５１の駆動伝達部５ａとの間にスリップを生じさせないためには両者間に圧力を掛けることが望ましい。また圧力を掛けだけでなく、コロ３の駆動伝達部３ａと拍車５１の駆動伝達部５ａには駆動伝達効率を高めるためにスリップしにくい材質を用いることが望ましい。材質例としてはゴム材が挙げられる。 In this embodiment as well, it is desirable to apply pressure between the drive transmission unit 3a of the roller 3 and the drive transmission unit 5a of the spur 51 so as not to cause a slip. In addition to applying pressure, it is desirable to use a material that does not easily slip to the drive transmission portion 3a of the roller 3 and the drive transmission portion 5a of the spur 51 in order to increase drive transmission efficiency. Examples of the material include rubber materials.
また図５により、拍車５１が厚さの薄い拍車であることがわかる。また拍車５１の駆動伝達部５ａがコロ３の駆動伝達部３ａと接している様子がわかる。これらコロ３の駆動伝達部３ａと拍車５１の駆動伝達部５ａにそれぞれギヤを用いて駆動連結することでコロ３と拍車５１の回転に対してスリップによる回転差が生じなくなるようにすることができる。すなわち、図５ではコロ３の駆動伝達部３ａと拍車５１の駆動伝達部５ａを円筒形状で記載してあるが、コロ３の駆動伝達部３ａと拍車５１の駆動伝達部５ａに平歯車あるいはハスバ歯車を用いる構成が可能である。ギヤの材質としては耐熱性及び耐磨耗性のある樹脂が望ましく、ＰＰＳ、ＰＡＩ、ＰＥＥＫ、ＰＡ、ＰＢＴ等が例として挙げられる。また、焼結材を使用してもよい。 5 that the spur 51 is a thin spur. It can also be seen that the drive transmission portion 5a of the spur 51 is in contact with the drive transmission portion 3a of the roller 3. By connecting the drive transmission unit 3a of the roller 3 and the drive transmission unit 5a of the spur 51 using gears, it is possible to prevent the rotation difference due to slip from occurring with respect to the rotation of the roller 3 and the spur 51. . That is, in FIG. 5, the drive transmission unit 3 a of the roller 3 and the drive transmission unit 5 a of the spur 51 are illustrated in a cylindrical shape, but a spur gear or a helical gear is added to the drive transmission unit 3 a of the roller 3 and the drive transmission unit 5 a of the spur 51. A configuration using gears is possible. The gear material is preferably a heat-resistant and wear-resistant resin, and examples thereof include PPS, PAI, PEEK, PA, and PBT. A sintered material may also be used.
なお、ローラ２に摺接しているコロ３は、ローラ２の回転に対して従動回転する。なお、拍車５１と駆動伝達部５ａとは独立して回転するものではなく、一体で回転する。また、コロ３と駆動伝達部３ａも独立して回転するものではなく、一体で回転する。一体で回転させる手段としては、駆動伝達部５ａ及び拍車５１がその軸５１ａへ、ともに圧入されている方法・溶接されている方法が挙げられる。図中３ｂはコロ３の軸を示す。 The roller 3 that is in sliding contact with the roller 2 rotates following the rotation of the roller 2. The spur 51 and the drive transmission unit 5a do not rotate independently, but rotate integrally. Further, the roller 3 and the drive transmission unit 3a are not independently rotated, but are integrally rotated. Examples of the means for rotating integrally include a method in which the drive transmission portion 5a and the spur 51 are press-fitted into the shaft 51a and a method in which the spur 51 is welded. In the figure, 3b represents the axis of the roller 3.
また本実施例においては、図６に示すように、剛性確保のために軸５１ａ付近は拍車５１を厚くし、記録材Ｐと接触する先端部のみを鋭利な形状にする構成も挙げられる。この場合、記録材Ｐと接触する部分の面積低減が図れるため、拍車５１の先端や分離爪４の表面４ｃにトナーが付着しにくく、良好な搬送性と良好な画像品質を維持できる。 Further, in this embodiment, as shown in FIG. 6, there is a configuration in which the spur 51 is thickened in the vicinity of the shaft 51 a to ensure rigidity, and only the tip portion in contact with the recording material P is sharpened. In this case, since the area of the portion in contact with the recording material P can be reduced, it is difficult for toner to adhere to the tip of the spur 51 and the surface 4c of the separation claw 4, and good transportability and good image quality can be maintained.
また、図６〜図８に示すように、コロ３と拍車５１それぞれの個数は１対１である構成だけにとどまらず、図７に示すように複数個同士の組み合わせを有する構成でもよいし、図８に示すようにコロ３あるいは拍車５１のどちらかが単数で他方が複数となる構成でもよい。 Moreover, as shown in FIGS. 6-8, the number of each of the roller 3 and the spur 51 is not limited to the configuration in which the number is 1: 1, and a configuration having a plurality of combinations as shown in FIG. As shown in FIG. 8, either the roller 3 or the spur 51 may be singular and the other may be plural.
＜実施例５＞
図１〜図４に示した実施例でクリーニング装置を用いることを説明したが、ローラによるクリーニング機構により、ローラ２と直接接触するコロ３の表面を傷つけないようにするだけでなく、コロ３にトナーが固着しても掻き取ることができて良好なクリーニングを可能とすることが必要なことを説明したが、本実施例は、図９に示すように、コロ３に付着したトナーをクリーニングする機構としてブレード３２を用いている。この実施例では、ブレード３２は分離爪４に固定され、その先端がコロ３に当接している。このブレード３２は板状の例えばＳＵＳ材をしならせてコロ３へ当接させてもよいし、耐熱性のある薄い樹脂シート等を使用しても良い。
<Example 5>
Although the use of the cleaning device has been described in the embodiment shown in FIGS. 1 to 4, the cleaning mechanism using the roller not only prevents the surface of the roller 3 in direct contact with the roller 2 from being damaged, Although it has been described that the toner can be scraped off even if the toner adheres and it is necessary to enable good cleaning, the present embodiment cleans the toner adhering to the roller 3 as shown in FIG. A blade 32 is used as the mechanism. In this embodiment, the blade 32 is fixed to the separation claw 4 and the tip thereof is in contact with the roller 3. The blade 32 may be made of a plate-like material such as SUS and may be brought into contact with the roller 3 or may be a heat-resistant thin resin sheet or the like.
これらをコロ３へ当接させるには、図９に示すように、ブレード３２の材質の弾性変形を利用してしならせる方法のほかに、圧縮または引張スプリングやトーションスプリングを使用して押し当てる方法も挙げられる。ブレード３２はコロ３の軸の長手方向に複数設けてもよい。またクリーニング機能を高めるためには、ブレード３２の先端を鋭利にすることも良い。このようなブレード３２によるクリーニング機構により、コロ３の表面に付着したトナーを掻き取れば、コロ３の表面にトナーがこびりつくことがなく、常に良好なクリーニング性能を維持できる。 To bring them into contact with the roller 3, as shown in FIG. 9, in addition to the method of making use of elastic deformation of the material of the blade 32, it is pressed using a compression or tension spring or a torsion spring. A method is also mentioned. A plurality of blades 32 may be provided in the longitudinal direction of the axis of the roller 3. In order to enhance the cleaning function, the tip of the blade 32 may be sharpened. By scraping off the toner adhering to the surface of the roller 3 by such a cleaning mechanism using the blade 32, the toner does not stick to the surface of the roller 3, and good cleaning performance can always be maintained.
上述したように、ローラ２からの記録材Ｐの高い分離性能を持ち、かつ分離爪４による擦れ跡が記録材Ｐ上の画像に発生しない高品質な分離手段を定着装置に設けることで、画像形成装置としてはより高い品質を得られる。上述したように、分離手段を構成する分離爪４の先端４ｂとローラ２との間にギャップＧを設けて非接触の構成としているため、鋭利な分離爪４の先端がローラあるいはベルト）の表面を傷つけることがなく、経時でもローラあるいはベルトの表面が磨耗しない。そのため、ローラあるいはベルトの表面の磨耗跡が記録材上の画像に現れることはなく、良好な画像品質を保つことができる。ローラあるいはベルトとコロ３は直接接触するが、このコロ３の幅を狭くしたり、もしくはこのコロ３のベルトとの接触するエッジ部にＲ形状を持たせてローラあるいはベルトとの接触面積を低減させれば、ローラあるいはベルト表面を磨耗させることがさらになくなるので、より望ましい。 As described above, by providing the fixing device with a high-quality separation unit that has a high separation performance of the recording material P from the roller 2 and that does not generate a rubbing trace due to the separation claw 4 on the image on the recording material P, As a forming apparatus, higher quality can be obtained. As described above, since the gap G is provided between the tip 4b of the separation claw 4 and the roller 2 constituting the separation means so as to be non-contact, the sharp tip of the separation claw 4 is the surface of the roller or belt). The surface of the roller or belt does not wear over time. Therefore, wear marks on the surface of the roller or belt do not appear in the image on the recording material, and good image quality can be maintained. The roller or belt and the roller 3 are in direct contact with each other, but the width of the roller 3 is narrowed, or an edge portion of the roller 3 that contacts the belt is provided with an R shape to reduce the contact area with the roller or the belt. This is more desirable because it eliminates further wear on the roller or belt surface.
また、以上のような定着装置を備えることにより、より良好な分離性能を確保し、かつ分離爪擦れ跡による異常画像の発生しない、より高度な定着品質を持った画像形成装置を構成することができる。 In addition, by providing the fixing device as described above, it is possible to configure an image forming apparatus having higher fixing quality that ensures better separation performance and does not generate an abnormal image due to the separation claw rubbing trace. it can.
１、２：ローラ（定着ローラあるいは定着ベルト）
３、５コロ
３ａコロの駆動伝達部
３ｂ：コロの軸
４：分離爪
４ａ：分離爪の回転支点
４ｂ：分離爪の先端
４ｃ分離爪の通紙側の表面
５ａ：拍車の駆動伝達部
６：スプリング
７給紙部
９レジストローラ
１１Ｙ、１１Ｍ、１１Ｃ、１１ＢＫ：感光体ドラム
１２：帯電部
１３：現像部
１４：転写バイアスローラ（１次転写バイアスローラ）
１５：クリーニング部
１６：中間転写ベルトクリーニング部
１７：中間転写ベルト
１８：２次転写バイアスローラ
３１：クリーニングローラ
２０：定着装置
２１：定着ベルト
２２：定着ローラ
２３：加熱ローラ
２４：加圧ローラ
２５：ガイド板
２６：加圧ベルト
２７：支持ローラ
３０：分離手段（分離爪）
３２：ブレード
５１：拍車
５１ａ：拍車の軸
１０１：画像形成装置本体
１０２：書込み部
１０３：原稿搬送部
１０４：原稿読込部
Ｄ：原稿
Ｇ：ギャップ
Ｎ：ニップ部
Ｐ記録材
Ｔ：トナー
Ｓ１、Ｓ２：サーミスタ
Ｈ１、Ｈ２：ヒータ（赤外線ヒータやＩＨヒータ）
1, 2: Roller (fixing roller or fixing belt)
3, 5 roller 3a roller drive transmission portion 3b: roller shaft 4: separation claw 4a: separation claw rotation fulcrum 4b: separation claw tip 4c surface of separation claw on paper passing side 5a: spur drive transmission portion 6: Spring 7 Paper feed unit 9 Registration rollers 11Y, 11M, 11C, 11BK: Photoconductor drum 12: Charging unit 13: Development unit 14: Transfer bias roller (primary transfer bias roller)
15: cleaning unit 16: intermediate transfer belt cleaning unit 17: intermediate transfer belt 18: secondary transfer bias roller 31: cleaning roller 20: fixing device 21: fixing belt 22: fixing roller 23: heating roller 24: pressure roller 25: Guide plate 26: Pressure belt 27: Support roller 30: Separation means (separation claw)
32: Blade 51: Spur 51a: Spur shaft 101: Image forming apparatus main body 102: Writing unit 103: Document conveying unit 104: Document reading unit D: Document G: Gap N: Nip part P Recording material T: Toner S1, S2 : Thermistor H1, H2: Heater (Infrared heater or IH heater)
Claims (8)
前記分離爪には、ローラもしくはベルトへ当接することで分離爪先端と該ローラもしくは該ベルトとの間にギャップを設けるコロを有し、
該コロに摺接させたクリーニング機構を有することを特徴とする定着装置の記録材分離装置。 In order to permanently fix the unfixed toner on the recording material, the recording material and the toner have a nip portion that applies heat and pressure, and after passing through the nip, the recording material is separated from the fixing roller, the fixing belt, or the pressure roller. In the fixing device having the separating means of
The separation claw has a roller that provides a gap between the separation claw tip and the roller or the belt by contacting the roller or the belt,
A recording material separating apparatus for a fixing device, comprising a cleaning mechanism in sliding contact with the roller.
前記コロに摺接する他のコロの一部分を前記記録材と接する前記分離爪の通紙側表面よりも突出させたことを特徴とする定着装置の記録材分離装置。 The recording material separating apparatus for a fixing device according to claim 1,
A recording material separating apparatus for a fixing device, wherein a part of another roller that is in sliding contact with the roller is protruded from a sheet passing side surface of the separation claw that is in contact with the recording material.
前記コロに接して回転する拍車の一部分を前記記録材と接する前記分離爪の通紙側表面よりも突出させたことを特徴とする定着装置の記録材分離装置。 The recording material separating apparatus for a fixing device according to claim 1,
A recording material separating apparatus for a fixing device, wherein a part of a spur rotating in contact with the roller is protruded from a sheet passing side surface of the separating claw in contact with the recording material.
前記拍車の軸が前記コロに摺接して前記拍車を駆動連結することを特徴とする定着装置の記録材分離装置。 The recording material separating apparatus for a fixing device according to claim 3,
A recording material separating apparatus for a fixing device, wherein the spur shaft is slidably contacted with the roller to drive-connect the spur.
前記コロにクリーニングローラを摺接させたことを特徴とする定着装置の記録材分離装置。 The recording material separating apparatus for a fixing device according to any one of claims 1 to 4,
A recording material separating device of a fixing device, wherein a cleaning roller is slidably contacted with the roller.
前記コロにクリーニングブレードを摺接させたことを特徴とする定着装置の記録材分離装置。 The recording material separating apparatus for a fixing device according to any one of claims 1 to 4,
A recording material separating apparatus of a fixing device, wherein a cleaning blade is slidably contacted with the roller.
An image forming apparatus having the fixing device according to claim 7.
Priority Applications (1)
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| Application Number | Priority Date | Filing Date | Title |
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| US11086256B1 (en) | 2020-01-31 | 2021-08-10 | Kyocera Document Solutions Inc. | Fixing device and image forming apparatus |
| KR20230075763A (en) * | 2021-11-23 | 2023-05-31 | 강현숙 | Finger for fusing device of copy machine and mounting structure of thereof |
| KR102668837B1 (en) * | 2021-11-23 | 2024-05-23 | 강현숙 | Finger for fusing device of copy machine and mounting structure of thereof |
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