JP2003241557A - Separating pawl for copying machine - Google Patents
Separating pawl for copying machineInfo
- Publication number
- JP2003241557A JP2003241557A JP2002037184A JP2002037184A JP2003241557A JP 2003241557 A JP2003241557 A JP 2003241557A JP 2002037184 A JP2002037184 A JP 2002037184A JP 2002037184 A JP2002037184 A JP 2002037184A JP 2003241557 A JP2003241557 A JP 2003241557A
- Authority
- JP
- Japan
- Prior art keywords
- claw
- resin
- copying machine
- roll
- fluororesin
- 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.)
- Pending
Links
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Fixing For Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、複写機、レーザー
ビームプリンター、印刷機等の電子写真方式による各種
画像形成装置(以下、「複写機」という)の定着部や現
像部において、定着ロール等のロールから複写紙、印刷
紙等の記録材(以下、「複写紙」という)を剥離するの
に用いられる分離爪に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing roll or the like in a fixing portion or a developing portion of various image forming apparatuses (hereinafter referred to as "copying machine") of an electrophotographic system such as a copying machine, a laser beam printer and a printing machine. The present invention relates to a separating claw used for peeling a recording material such as copy paper or printing paper (hereinafter referred to as "copy paper") from the roll.
【0002】[0002]
【従来の技術】複写機に使用される分離爪の機能として
は、印刷用トナーが付着しない非粘着性、分離爪先端部
が変形したり破損したりしない形状安定性、爪先が接触
するロール表面を傷つけないロールへの非攻撃性、更
に、特に高温の定着ロールに接触する分離爪において
は、およそ200〜230℃の高温において変形しない
耐熱性が要求される。従来、このような複写機用分離爪
としては、耐熱性、剛性を有する材料を母材として形成
された分離爪の表面にフッ素樹脂や特定の低分子量フッ
素重合体等の非粘着性被覆を形成させたもの、補強材や
フッ素樹脂等の非粘着性付与剤を前記分離爪を形成する
母材中に練り込んだもの、更に、前記耐熱性、剛性材料
を母材として形成された分離爪における爪先端部等の一
部にフッ素樹脂等の非粘着性部材を取り付けたものがあ
る。2. Description of the Related Art The function of a separating claw used in a copying machine is non-adhesive to prevent the toner for printing from adhering, shape stability in which the tip of the separating claw is not deformed or damaged, and the roll surface with which the toe contacts. A non-aggressive effect on the roll that does not damage the sheet, and a heat resistance that does not deform at a high temperature of approximately 200 to 230 ° C. are required particularly for the separating claw that comes into contact with the high temperature fixing roll. Conventionally, as separation nails for such copying machines, a non-adhesive coating such as a fluororesin or a specific low molecular weight fluoropolymer is formed on the surface of the separation nail formed of a material having heat resistance and rigidity as a base material. A non-tackiness-imparting agent such as a reinforcing material or a fluororesin kneaded into the base material forming the separating claw, and a separating claw formed using the heat resistant and rigid material as the base material. There is one in which a non-adhesive member such as a fluororesin is attached to a part of the nail tip portion or the like.
【0003】例えば、前記のような従来の分離爪とし
て、特開昭62−157074号公報には、芳香族ポリ
アミドイミド樹脂、ポリイミド樹脂、ポリフェニレンサ
ルファイド樹脂、ポリエーテルエーテルケトン樹脂、ポ
リエーテルサルホン樹脂、ポリエーテルイミド樹脂、芳
香族ポリエステル樹脂等の耐熱性樹脂製分離爪の少なく
とも先端部の表面層がフッ素系化合物によって被覆され
たもの、特開平1−257884号公報には、ポリイミ
ドまたはこれに繊維状補強材や固体潤滑剤を含む成形材
料の成形物を成形後熱処理し、更にその表面に連続した
フルオロカーボン樹脂膜を形成させたものが開示されて
いる。また、特開昭61−182071号公報には、ポ
リフェニレンサルファイド、ポリエーテルサルフォン、
ポリアミド等の結着樹脂中にチタン酸カリウムウイスカ
ー等の補強材を添加した材料から射出成形したもの、特
開昭61−27575号公報には、熱可塑性ポリエーテ
ル芳香族ケトンに、チタン酸カリ繊維、アスベスト繊
維、芳香族ポリアミド繊維等の耐熱性を有する補強繊維
を配合し、または補強繊維の一部をマイカ、タルク、炭
酸カルシウム等の無機充填材と置換した材料からなるも
のが開示されている。更に、特開昭62−127781
号公報には、フッ素樹脂製爪先端部とこれより硬度の高
いABS樹脂等で作られた爪保持部材とを熱カシメで一
体に結合したもの、実開昭62−113358号公報に
は、アルミニウム、ステンレススチール等の金属または
ポリイミド、ポリアミドイミド等のポリイミド系樹脂等
の剛性材料で形成された本体と、フッ素樹脂で形成され
た案内部とがアリ溝、T溝等により機械的に取り付けら
れたもの、実開昭62−132572号公報には、耐熱
性樹脂よりなる分離爪本体とフッ素系樹脂またはシリコ
ーン樹脂よりなる分離爪上部材から一体的に構成された
もの、特開平6−149114号公報には、ポリイミド
(PI)樹脂からなる分離爪本体の先端部に、回転部材
と接触する接触部位を四フッ化エチレン(PTFE)樹
脂チップで形成したものがそれぞれ開示されている。For example, as a conventional separating claw as described above, JP-A-62-157074 discloses an aromatic polyamideimide resin, a polyimide resin, a polyphenylene sulfide resin, a polyether ether ketone resin, a polyether sulfone resin. , At least the surface layer of the separation nail made of a heat-resistant resin such as a polyetherimide resin or an aromatic polyester resin is coated with a fluorine-based compound, and in JP-A-1-257884, a polyimide or a fiber It is disclosed that a molded product of a molding material containing a particulate reinforcing material and a solid lubricant is heat-treated after molding, and further a continuous fluorocarbon resin film is formed on the surface thereof. Further, in JP-A-61-182071, polyphenylene sulfide, polyether sulfone,
Injection-molded from a material in which a reinforcing material such as potassium titanate whiskers is added to a binder resin such as polyamide, and JP-A-61-27575 discloses a thermoplastic polyether aromatic ketone and potassium titanate fiber. , Asbestos fibers, aromatic polyamide fibers, or the like, is mixed with heat-resistant reinforcing fibers, or a part of the reinforcing fibers is replaced with an inorganic filler such as mica, talc, or calcium carbonate is disclosed. . Furthermore, JP-A-62-127781
Japanese Patent Laid-Open No. 62-113358 discloses a combination of a fluororesin claw tip and a claw holding member made of ABS resin having a higher hardness, which are integrally joined by thermal caulking. , A body formed of a rigid material such as a metal such as stainless steel or a polyimide-based resin such as polyimide or polyamide-imide, and a guide portion formed of a fluororesin were mechanically attached by dovetail grooves, T-grooves, etc. In Japanese Utility Model Laid-Open No. 62-132572, a structure in which a separating claw main body made of a heat-resistant resin and a separating claw upper member made of a fluorine resin or a silicone resin are integrally formed, JP-A-6-149114. At the tip of the separation claw body made of polyimide (PI) resin, a contact portion that comes into contact with the rotating member is formed with a tetrafluoroethylene (PTFE) resin chip. What it is disclosed, respectively.
【0004】[0004]
【発明が解決しようとする課題】近年、急速に一般化し
てきたデジタルあるいはカラー式複写機においては、従
来のアナログ式複写機よりもロール表面の傷が画面に影
響する。また、分離爪本来の機能が低下し、紙詰まりや
トナー付着による画質低下等が発生した場合、部品交換
で対応する。そこで、従来は、前記ロール表面の傷や分
離爪の機能低下に対しては、定期的に補修するなどして
対応しているが、分離爪のロールへの攻撃性が高く、ま
た分離爪の寿命が短いと、補修の回数が増え、複写機の
点検や補修等の維持費が増大する。このため、ロールへ
の傷付け(攻撃性)がより少なく、しかも複写機が使用
可能な間は紙詰まりやトナー付着による画質低下等がな
く長期にわたって本来の機能を維持しうる分離爪が求め
られている。In recent years, in digital or color type copying machines which have been rapidly generalized, scratches on the roll surface affect the screen more than in conventional analog type copying machines. Further, when the original function of the separation claw is deteriorated and the image quality is deteriorated due to paper jam or toner adhesion, the parts can be replaced. Therefore, conventionally, for the scratches on the roll surface and the function deterioration of the separating claw, it is dealt with by regularly repairing, but the aggression of the separating claw on the roll is high, and the separating claw If the service life is short, the number of repairs will increase, and the maintenance cost for inspection and repair of the copying machine will increase. For this reason, there is a demand for a separating claw that is less likely to damage the roll (aggressiveness) and has no deterioration in image quality due to paper clogging or toner adhesion while the copier is usable and that can maintain its original function for a long period of time. There is.
【0005】しかし、従来の複写機用分離爪では、表面
をフッ素系樹脂等で被覆した分離爪の場合、耐熱性かつ
剛性のある樹脂やセラミック、金属等を母材として爪が
形成されていることから、高温における形状安定性に優
れ、また爪表面を被覆するフッ素系樹脂を比較的高温で
焼成することから非粘着性に優れ、トナーが付着しにく
いという特長を有する。しかし、その一方で、フッ素系
樹脂等の被覆膜の厚みが通常20〜50μmと薄いた
め、被覆膜の剥離や長期使用による被覆膜の摩耗等によ
り母材が露出し、ロールの表面を傷つけるという問題が
あった。また、フッ素系樹脂等の非粘着性付与剤を分離
爪の母材中に練り込んだものでは、摩耗が進行しても母
材中に練り込まれたフッ素樹脂等の効果により摩擦抵抗
が比較的小さい状態に維持され、前記のような表面に非
粘着性被膜を形成したものに較べると長期使用によるロ
ールへの攻撃性の変化は少ない。しかし、その一方で、
分離爪表面におけるフッ素系樹脂の被覆割合が少ないた
めに、非粘着性には劣り、トナー付着による画質低下が
発生しやすいという問題がある。また、爪先端部等の分
離爪の一部にフッ素樹脂等の非粘着性部材を取り付けた
ものでは、分離爪製造時に非粘着性部材の取り付け誤差
が発生しやすい。このため、ロールの表面に対して分離
爪接触面が均一に接触しない場合があり、爪部のエッジ
がロール面に対して突き当てられる結果、ロール表面に
傷を発生させやすくなる。また、分離爪の取り付け軸中
心から爪先端までの距離に誤差が生じて、分離爪本来の
機能である複写紙の分離機能が不十分となる場合もあ
る。また、この分離爪の一部に非粘着性部材を取り付け
たものでは、非粘着性部材以外の部分、例えば分離爪側
面は非粘着性に劣るが、定着ロール周辺にはトナーが浮
遊しているため、非粘着性に劣る分離爪側面等に付着、
堆積したトナーが振動により爪から剥離して複写紙上に
落下して紙面を汚染する恐れもある。更に、分離爪はロ
ールの回転軸と平行な軸により回動可能に取り付けら
れ、バネ等の付勢手段によりロールやドラムの表面に適
正な圧力で接触させてあり、回転するロールの動きに対
してスムーズに追従し、爪先端部とロールとの適正な距
離を保つ必要がある。しかし、上記のような従来の分離
爪は、いずれも軸部を含む全体が剛性材料で形成されて
いるため高速で回転するロールの動きに追随できず、ま
た軸部の摺動性に劣るため、紙詰まりを起こすなどして
近年の複写機の高速化に必ずしも対応できない場合があ
る。また、軸部の摺動性が劣るため振動音が発生しやす
く、近年のOA機器に要求されている静音性の点でも問
題がある。However, in the conventional separating claw for a copying machine, in the case of a separating claw whose surface is coated with a fluorine resin, the claw is formed by using a heat-resistant and rigid resin, ceramic, metal or the like as a base material. Therefore, the shape stability at high temperature is excellent, and the fluorine-based resin coating the surface of the nail is fired at a relatively high temperature so that it is excellent in non-adhesiveness and toner is hard to adhere. However, on the other hand, since the thickness of the coating film such as a fluorine resin is usually as thin as 20 to 50 μm, the base material is exposed due to peeling of the coating film or abrasion of the coating film due to long-term use, and the surface of the roll is exposed. There was a problem of hurt. Also, in the case where a non-tackifying agent such as a fluororesin is kneaded into the base material of the separating claw, the friction resistance is compared by the effect of the fluororesin kneaded into the base material even if abrasion progresses. It is maintained in a relatively small state, and the change in the aggressiveness to the roll due to long-term use is less than that in the case where the non-adhesive coating is formed on the surface as described above. But on the other hand,
Since the ratio of the fluororesin coating on the surface of the separation claw is small, the non-adhesiveness is poor, and there is a problem that deterioration of image quality due to toner adhesion easily occurs. Further, in a case where a non-adhesive member such as a fluororesin is attached to a part of the separation claw such as the tip of the claw, an attachment error of the non-adhesive member is likely to occur at the time of manufacturing the separation claw. For this reason, the separation claw contact surface may not evenly contact the surface of the roll, and as a result of the edge of the claw portion abutting against the roll surface, scratches are likely to occur on the roll surface. In addition, an error may occur in the distance from the center of the mounting axis of the separation claw to the tip of the claw, and the original function of the separation claw to separate the copy sheet may become insufficient. Further, in the case where a non-adhesive member is attached to a part of the separation claw, the part other than the non-adhesive member, for example, the side surface of the separation claw is inferior in non-adhesiveness, but the toner is floating around the fixing roll. For this reason, it adheres to the side surface of the separation claw, etc.
The accumulated toner may be separated from the nail due to vibration and fall on the copy paper to contaminate the paper surface. Further, the separating claw is rotatably attached by an axis parallel to the rotation axis of the roll, and is brought into contact with the surface of the roll or the drum with an appropriate pressure by an urging means such as a spring to prevent movement of the rotating roll. It is necessary to keep a proper distance between the tip of the claw and the roll. However, the conventional separation claws as described above cannot follow the movement of the roll rotating at a high speed because the whole including the shaft portion is made of a rigid material, and the slidability of the shaft portion is poor. However, it may not always be possible to cope with the recent increase in speed of copying machines due to paper jams. Moreover, since the slidability of the shaft portion is poor, vibration noise is likely to be generated, and there is a problem in terms of quietness required for OA equipment in recent years.
【0006】本発明は、上記のような従来の複写機用分
離爪における問題点に鑑み、非粘着性の耐久性に優れ、
かつロールへの傷付け(攻撃性)が少なく、トナー付着
やロール表面への傷付けによる画質低下を抑制でき、し
かも摺動性に優れ、複写機の高速化に対応できるととも
に、静音性にも優れた複写機用分離爪を提供することを
目的とするものである。In view of the above problems of the conventional separating claw for a copying machine, the present invention is excellent in non-adhesive durability,
In addition, there is little damage (aggressiveness) to the roll, it is possible to suppress deterioration of image quality due to toner adhesion and damage to the roll surface, and it has excellent slidability, can correspond to high speed copying machines, and is also quiet. The purpose is to provide a separating claw for a copying machine.
【0007】[0007]
【課題を解決するための手段】上記の目的を達成するた
め、本発明の複写機用分離爪は、支軸又は軸孔部分を含
む全体をフッ素系樹脂にて一体成形した。この複写機用
分離爪は、フッ素系樹脂の射出成形により一体成形する
ことが好ましい。In order to achieve the above object, the separating claw for a copying machine according to the present invention is integrally molded with a fluorine resin, including the supporting shaft or the shaft hole portion. It is preferable that the separating claw for a copying machine is integrally formed by injection molding of a fluororesin.
【0008】前記フッ素系樹脂としては、四フッ化エチ
レン・六フッ化プロピレン共重合樹脂(FEP)、四フ
ッ化エチレン・パーフルオロアルコキシエチレン共重合
樹脂(PFA)、四フッ化エチレン・エチレン共重合樹
脂(ETFE)、ビニリデンフルオライド樹脂(PVD
F)、ビニルフルオライド樹脂(PVF)又はエチレン
−クロロトリフルオロエチレン共重合樹脂(ECTF
E)を用いることができる。これらのフッ素系樹脂は、
1種類を単独で用いてもよいし、2種以上を混合して用
いてもよい。Examples of the fluorine resin include tetrafluoroethylene / hexafluoropropylene copolymer resin (FEP), tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (PFA), tetrafluoroethylene / ethylene copolymer. Resin (ETFE), vinylidene fluoride resin (PVD
F), vinyl fluoride resin (PVF) or ethylene-chlorotrifluoroethylene copolymer resin (ECTF)
E) can be used. These fluororesins are
One kind may be used alone, or two or more kinds may be mixed and used.
【0009】[0009]
【発明の実施の形態】本発明の分離爪は、例えばトナー
像転写式の乾式静電複写機や湿式静電複写機、レーザー
ビームプリンター、液晶プリンター、ファクシミリ用プ
リンター等、PPC、LBP、LED、LCD、CRT
等の各種プリンター、複写機、印刷機等の画像形成装置
全般に適用される。また、この分離爪の装着部位として
は、これらの複写機等における定着部、現像部など、ド
ラムやロールと複写紙との分離部の全てに装着すること
ができる。但し、用途に応じてフッ素樹脂の種類は選択
する必要がある。即ち、高温環境で使用される耐熱性を
要求される定着部の分離爪の場合には、比較的融点の高
い四フッ化エチレン・パーフルオロアルコキシエチレン
共重合樹脂(PFA、例えば融点305〜310℃)、
四フッ化エチレン・六フッ化プロピレン共重合樹脂(F
EP、例えば融点280℃)、四フッ化エチレン・エチ
レン共重合樹脂(ETFE、例えば融点267℃)、エ
チレン−クロロトリフルオロエチレン共重合樹脂(EC
TFE、例えば融点240℃)などを用いることが好ま
しく、これらの中でも四フッ化エチレン・パーフルオロ
アルコキシエチレン共重合樹脂(PFA)を用いること
がより好ましい。一方、あまり耐熱性を要求されない現
像部等の分離爪の場合には、前記以外の比較的低融点の
ビニリデンフルオライド樹脂(PVDF、例えば融点1
65℃)、ビニルフルオライド樹脂(PVF、例えば融
点165℃)を用いることもできる。BEST MODE FOR CARRYING OUT THE INVENTION The separating claw of the present invention is, for example, a toner image transfer type dry electrostatic copying machine, a wet electrostatic copying machine, a laser beam printer, a liquid crystal printer, a printer for a facsimile, PPC, LBP, LED, LCD, CRT
It is applied to various image forming apparatuses such as various printers, copiers and printing machines. The separating claws can be mounted on all the separating parts of the copying paper such as the fixing part and the developing part of these copying machines. However, it is necessary to select the type of fluororesin according to the application. That is, in the case of the separating claw of the fixing unit which is used in a high temperature environment and is required to have heat resistance, a tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (PFA, for example, melting point 305 to 310 ° C.) having a relatively high melting point is used. ),
Tetrafluoroethylene / hexafluoropropylene copolymer resin (F
EP, eg, melting point 280 ° C., tetrafluoroethylene / ethylene copolymer resin (ETFE, eg, melting point 267 ° C.), ethylene-chlorotrifluoroethylene copolymer resin (EC
It is preferable to use TFE, for example, a melting point of 240 ° C.), and among these, it is more preferable to use tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (PFA). On the other hand, in the case of a separating claw such as a developing section which is not required to have high heat resistance, a vinylidene fluoride resin (PVDF, for example, melting point 1 having a relatively low melting point other than the above is used.
65 ° C.) and vinyl fluoride resin (PVF, for example, melting point 165 ° C.) can also be used.
【0010】本発明に係る分離爪は、その全体がフッ素
系樹脂により一体に成形されている。例えば、図1に示
すように、分離爪1に支軸2が一体に成形してある。ま
たは、例えば図2に示すように、分離爪1aに軸孔2a
を設けてある。そして、図3に示すように、前記分離爪
1は、定着ロールその他のロール10の回転軸11と前
記支軸2とを平行にして該支軸2を中心に回動可能と
し、また、前記分離爪1aは、前記軸孔2a部分をロー
ル10の回転軸11と平行に設けられた取付軸4へ挿通
して、該取付軸4を中心に回動可能とし、バネ等の付勢
手段3によりロール10の表面へ爪先端部を適正な圧力
で接触させた状態に取り付けられる。The separating claw according to the present invention is integrally formed of a fluororesin as a whole. For example, as shown in FIG. 1, the support shaft 2 is integrally formed with the separation claw 1. Alternatively, for example, as shown in FIG. 2, the separation claw 1a has a shaft hole 2a.
Is provided. As shown in FIG. 3, the separation claw 1 is rotatable about the support shaft 2 by making the rotation shaft 11 of the fixing roll or other roll 10 and the support shaft 2 parallel to each other. The separation claw 1a is inserted through the shaft hole 2a into a mounting shaft 4 provided in parallel with the rotation shaft 11 of the roll 10 so as to be rotatable around the mounting shaft 4 and a biasing means 3 such as a spring. By this, the tip of the claw is attached to the surface of the roll 10 with an appropriate pressure.
【0011】前記分離爪1、1aは、フッ素系樹脂の射
出成形により一体成形される。フッ素系樹脂としては、
四フッ化エチレン・六フッ化プロピレン共重合樹脂(F
EP)、四フッ化エチレン・パーフルオロアルコキシエ
チレン共重合樹脂(PFA)、四フッ化エチレン・エチ
レン共重合樹脂(ETFE)、ビニリデンフルオライド
樹脂(PVDF)、ビニルフルオライド樹脂(PVF)
及びエチレン−クロロトリフルオロエチレン樹脂(EC
TFE)等が挙げられる。前記FEPとしては、例えば
三井・デュポン株式会社のテフロン(登録商標)FE
P、PFAとしては、例えば三井・デュポン株式会社の
テフロン(登録商標)PFA、ETFEとしては、例え
ば旭硝子株式会社のアフロン(登録商標)COP、PV
DFとしては、例えばアトフィナ・ジャパン株式会社の
カイナー(登録商標)、更にECTFEとしては、例え
ばアウジモント株式会社のヘイラー(登録商標)等が挙
げられる。なお、複写機用分離爪成形用樹脂中には、上
記のようなフッ素樹脂の他に、アラミド繊維、タルク、
マイカ、黒鉛等の、ロールへの攻撃性の低い充填材を、
本発明の目的を損なわない範囲で添加することができ
る。The separation claws 1 and 1a are integrally formed by injection molding of a fluororesin. As a fluororesin,
Tetrafluoroethylene / hexafluoropropylene copolymer resin (F
EP), tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (PFA), tetrafluoroethylene / ethylene copolymer resin (ETFE), vinylidene fluoride resin (PVDF), vinyl fluoride resin (PVF)
And ethylene-chlorotrifluoroethylene resin (EC
TFE) and the like. Examples of the FEP include Teflon (registered trademark) FE manufactured by Mitsui DuPont Co., Ltd.
Examples of P and PFA include Teflon (registered trademark) PFA of Mitsui DuPont Co., Ltd., and examples of ETFE include Aflon (registered trademark) COP and PV of Asahi Glass Co., Ltd.
Examples of DF include Kainer (registered trademark) of Atofina Japan Co., Ltd., and examples of ECTFE include Halar (registered trademark) of Audimont Co., Ltd. In addition, in the resin for forming the separated nail for the copying machine, in addition to the above-mentioned fluororesin, aramid fiber, talc,
Fillers with low roll attack, such as mica and graphite,
It can be added within a range that does not impair the object of the present invention.
【0012】上記のようなフッ素樹脂により分離爪を射
出成形するには、従来から分離爪の射出成形に用いられ
ている一般的な射出成形機を用い、かつ各種フッ素樹脂
毎の一般的な成形条件により成形することができる。In order to injection-mold the separating claw with the above-mentioned fluororesin, a general injection molding machine conventionally used for injection-molding the separating claw is used, and a general molding for each fluororesin is carried out. It can be molded depending on the conditions.
【0013】なお、フッ素系樹脂として、四フッ化エチ
レン樹脂(PTFE)も上記した各種フッ素系樹脂と同
様に非粘着性を有するものである。しかし、PTFEの
成形品は一般に粉体を圧縮成形して形成されるが、PT
FEの粉体圧縮成形により成形した分離爪の場合は、上
記した各種フッ素系樹脂の射出成形品に較べると耐久性
に劣る。その詳細な理由は必ずしも明らかではないが、
圧縮成形の場合、粉体間の密着性、一体性に欠けるのに
対し、フッ素系樹脂の射出成形品の場合は、金型への流
入時に爪先端部で分子配向が起こり耐久性が発揮される
のではないかと推定される。As the fluorine resin, tetrafluoroethylene resin (PTFE) is also non-adhesive like the above-mentioned various fluorine resins. However, PTFE molded products are generally formed by compression molding powder, but PT
Separation claws molded by FE powder compression molding are inferior in durability as compared with the above-mentioned various fluororesin injection molded products. Although the detailed reason is not always clear,
In the case of compression molding, the adhesion and integrity of the powder particles are lacking, whereas in the case of fluororesin injection molded products, molecular orientation occurs at the tip of the nail when flowing into the mold, and durability is exhibited. It is presumed that it may occur.
【0014】本発明の複写機用分離爪の形状は特に限定
されるものではなく、基本的には従来からの分離爪と同
様の形状のものでよいが、爪先端部の形状は重要であ
る。特に、全体がフッ素系樹脂で形成される本発明の分
離爪の場合、爪先端部の角度は、耐久性、即ち、爪先端
部の形状安定性に重要である。即ち、フッ素系樹脂の場
合、従来の分離爪の母材材料と比較して軟らかく弾性率
が低い。このため、先端角度が5度以下では、ロールへ
の押しつけ力にもよるが、曲がり変形によりロールと分
離爪先端部との間に隙間ができて通紙時に複写紙の紙詰
まりが発生しやすい。一方、先端角度が80度以上で
は、曲がり変形は起こり難いものの、複写紙の分離機能
が発揮されにくい。従って、分離爪の先端角度は5〜8
0度の範囲が好ましく、25〜45度の範囲がより好ま
しい。なお、ここでの分離爪の先端角度とは、例えば図
4に示すように、ロール10と分離爪1とを通常の使用
状態に接触させた際に、ロール10の回転軸11側から
見て、ロール10と接触する側の分離爪1の稜線L
1と、複写紙Pが通過する側の分離爪1の稜線L2とがな
す角度θのことをいう。The shape of the separating claw for a copying machine according to the present invention is not particularly limited and may be basically the same as the conventional separating claw, but the shape of the tip of the claw is important. . In particular, in the case of the separating claw of the present invention, which is entirely formed of a fluorine-based resin, the angle of the claw tip is important for durability, that is, the shape stability of the claw tip. That is, the fluorine-based resin is softer and has a lower elastic modulus than the conventional base material of the separating claw. For this reason, when the tip angle is 5 degrees or less, although it depends on the pressing force against the roll, due to the bending deformation, a gap is created between the roll and the tip of the separation claw, and the paper jam of the copy paper easily occurs at the time of paper passing. . On the other hand, when the tip angle is 80 degrees or more, the bending deformation is less likely to occur, but the separating function of the copy paper is hard to be exerted. Therefore, the tip angle of the separating claw is 5 to 8
The range of 0 degrees is preferable, and the range of 25 to 45 degrees is more preferable. It should be noted that the tip angle of the separating claw here is, as shown in FIG. 4, for example, when viewed from the rotating shaft 11 side of the roll 10 when the roll 10 and the separating claw 1 are brought into contact with each other in a normal use state. , The ridge line L of the separation claw 1 on the side in contact with the roll 10
The angle θ formed by 1 and the ridge line L 2 of the separation claw 1 on the side where the copy paper P passes.
【0015】[0015]
【実施例】(実施例1)四フッ化エチレン・パーフルオ
ロアルコキシエチレン共重合樹脂(テフロン(登録商
標)PFA 340−J、融点305−310℃、三井
・デュポン株式会社)により、射出成形機(東芝機械株
式会社製、IS55EPN)を用いて、樹脂温度360
℃、金型温度200℃、射出圧力110MPaの条件で
複写機の定着部用分離爪を射出成形した。Example 1 A tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (Teflon (registered trademark) PFA 340-J, melting point 305-310 ° C., Mitsui DuPont Co., Ltd.) was used to injection molding machine ( Resin temperature 360 using IS55EPN manufactured by Toshiba Machine Co., Ltd.
C., the mold temperature was 200.degree. C., and the injection pressure was 110 MPa.
【0016】(比較例1)ポリエーテルエーテルケトン
樹脂(スミプロイK(登録商標)CK3420、住友化
学工業株式会社)により、実施例1と同じ射出成形機を
用い、樹脂温度380℃、金型温度150℃、射出圧力
120MPaの条件で実施例1と同じ形状の定着部用分
離爪を射出成形した。この射出成形品の表面をフッ素樹
脂系塗料(ダイキン工業株式会社製、TC−7409B
K)で塗装し、180℃で30分間焼き付けた。(Comparative Example 1) Polyether ether ketone resin (SUMIPLOY K (registered trademark) CK3420, Sumitomo Chemical Co., Ltd.) was used in the same injection molding machine as in Example 1 with a resin temperature of 380 ° C. and a mold temperature of 150. The separation claw for the fixing part having the same shape as that of Example 1 was injection-molded under the conditions of ° C and an injection pressure of 120 MPa. The surface of this injection-molded product was coated with a fluororesin coating (manufactured by Daikin Industries, Ltd., TC-7409B
K) and baked at 180 ° C. for 30 minutes.
【0017】上記のようにして作製した実施例1及び比
較例1の定着部用分離爪を市販のアナログ式複写機(A
4横サイズで30枚/分)の定着部にセットし、以下の
試験項目について評価を行った。The separation claws for the fixing section of Example 1 and Comparative Example 1 produced as described above are commercially available analog copying machines (A
It was set in a fixing unit of 4 sheets of horizontal size (30 sheets / minute), and the following test items were evaluated.
【0018】[試験項目、評価方法]
(1)トナー付着性
シャープ株式会社製複写機AR−L501に使用される
トナーを紙袋に入れ、該紙袋に被検サンプルの分離爪を
同時に投入し、数回、上下に振った後、ピンセットにて
袋から被検サンプルを取り出し、トナー付着による分離
爪重量の増加量を測定した。
(2)ロールへの攻撃性
分離爪をロールと接触させた状態でA4用紙35000
枚を通紙させた後、ロール表面のキズ深さを、三次元表
面粗さ形状測定機(株式会社東京精密製、サーフコム5
5A)で測定した。
(3)静音性
複写機運転時の音を耳で聞き、鳴き(キーキー音、カタ
カタ音)が発生しない場合を「◎」、鳴きが時折発生す
る場合を「○」、常に鳴きが発生する場合を「×」とし
た。[Test Items and Evaluation Method] (1) Toner Adhesiveness Toner used in a copying machine AR-L501 manufactured by Sharp Corporation is put in a paper bag, and the separation claws of the sample to be tested are put in the paper bag at the same time. After shaking up and down once, the sample to be tested was taken out from the bag with tweezers, and the amount of increase in the weight of the separating claw due to toner adhesion was measured. (2) Aggressiveness to roll A4 paper 35000 with separation claw in contact with roll
After passing the sheet through, the scratch depth of the roll surface was measured by a three-dimensional surface roughness profile measuring instrument (manufactured by Tokyo Seimitsu Co., Ltd., Surfcom 5
5A). (3) Quietness When you hear the sound of the copier operating with your ears, "◎" when no squeaking (key squeaking, rattling) occurs, "○" when occasionally squeaking occurs, and when squeaking always occurs Was designated as "x".
【0019】試験結果を表1に示す。The test results are shown in Table 1.
【0020】[0020]
【表1】 [Table 1]
【0021】(実施例2)四フッ化エチレン・エチレン
共重合樹脂(アフロン(登録商標)COP C−88A
XM、融点267℃、旭硝子株式会社)により、射出成
形機(東芝機械株式会社製、IS55EPN)を用い
て、樹脂温度300℃、金型温度100℃、射出圧力1
00MPaの条件で複写機の現像部用分離爪を射出成形
した。(Example 2) Tetrafluoroethylene / ethylene copolymer resin (Aflon (registered trademark) COP C-88A)
XM, melting point 267 ° C., Asahi Glass Co., Ltd., using an injection molding machine (IS55EPN manufactured by Toshiba Machine Co., Ltd.), resin temperature 300 ° C., mold temperature 100 ° C., injection pressure 1
The separation claw for the developing section of the copying machine was injection molded under the condition of 00 MPa.
【0022】(比較例2)ポリアミドイミド樹脂(トー
ロン 4203L、アコモエンジニアリングポリマーズ
社)により、実施例2と同じ射出成形機を用い、樹脂温
度345℃、金型温度220℃、射出圧力180MPa
の条件で実施例2と同じ形状の現像部用分離爪を射出成
形した。(Comparative Example 2) Polyamideimide resin (Torlon 4203L, Acomo Engineering Polymers, Inc.) was used, using the same injection molding machine as in Example 2, with resin temperature 345 ° C., mold temperature 220 ° C., injection pressure 180 MPa.
Under the conditions described above, a separating claw for the developing section having the same shape as that of Example 2 was injection molded.
【0023】上記のようにして作製した実施例2及び比
較例2の現像部用分離爪を市販のアナログ式複写機(A
4横サイズで30枚/分)の現像部にセットし、トナー
付着性、ロールへの攻撃性及び静音性について、実施例
1と同様にして評価を行った。結果を表2に示す。The separation claws for the developing section of Example 2 and Comparative Example 2 produced as described above were used as commercially available analog copying machines (A
The sheet was set in a developing unit of 4 horizontal sizes (30 sheets / minute), and the toner adhesion, roll attack and noise reduction were evaluated in the same manner as in Example 1. The results are shown in Table 2.
【0024】[0024]
【表2】 [Table 2]
【0025】表1及び表2の結果から、全体をフッ素樹
脂で一体成形してなる実施例1及び実施例2の分離爪
は、ポリエーテルエーテルケトン樹脂を母材として表面
にフッ素樹脂コートした比較例1の分離爪やポリアミド
イミド樹脂で成形した比較例2の分離爪に較べてトナー
が付着しにくく、またロールへの攻撃性が低く、静音性
にも優れていることが明らかである。From the results shown in Tables 1 and 2, the separation claws of Examples 1 and 2 which were integrally molded with a fluororesin were integrally molded with a polyetheretherketone resin as a base material and the surface thereof was coated with a fluororesin. As compared with the separating claw of Example 1 and the separating claw of Comparative Example 2 formed of a polyamideimide resin, it is clear that toner is less likely to adhere, the roll is less aggressive, and the noise is excellent.
【0026】[0026]
【発明の効果】以上のように、本発明に係る複写機用分
離爪は、爪全体を非粘着性材料であるフッ素系樹脂で一
体成形してなることから、爪全体にトナーが付着しにく
く、側面に付着したトナーによって複写面を汚したりす
る恐れもない。また定着ロールやドラム等の表面に接触
する爪先端部とロール等との間の摩擦が小さく、かつ表
面に非粘着性被膜を形成した従来の分離爪のように長期
使用時に非粘着性被膜の摩耗により非粘着性が低下した
り、母材が露出してロール等の表面を傷つけるといった
ことがなく、しかもポリエーテルエーテルケトン、ポリ
アミドイミド、ポリアミド、ポリイミド等の剛性の高い
合成樹脂、金属、セラミックスなどの剛性材料を母材と
して製造された従来の分離爪に較べると爪全体が軟らか
いため、ロール等への攻撃性も低い。従って、本発明の
分離爪によれば、トナー付着やロール表面への傷付けに
よる画像低下を長期間にわたって抑制することができ、
複写機の点検や補修等の維持費を低減することができ
る。しかも、支軸や軸孔部分をも含む全体がフッ素樹脂
で一体成形されていることから、剛性材料を母材とする
従来の分離爪に較べると爪全体が軟らかく、かつ軸部の
摺動性に優れ、ロール等の動きに対してスムーズに追従
できる。このため、複写機の高速化に対応可能であると
ともに、軸部からの摺動音の発生を抑えて静音性の優れ
たものとなる。また全体を一体成形してなることから寸
法精度に優れるため、剛性材料を母材として成形された
爪に非粘着性部材を機械的に取り付けた分離爪の場合の
ように、取り付け寸法誤差によりロール表面を傷つけた
り、複写紙の分離機能に支障を来すといったこともな
い。As described above, since the separating claw for a copying machine according to the present invention is integrally molded with the fluororesin which is a non-adhesive material, the toner hardly adheres to the entire claw. Also, there is no risk of soiling the copy surface by the toner adhering to the side surface. In addition, there is little friction between the tip of the claw that comes into contact with the surface of the fixing roll or drum and the roll, and the non-adhesive coating is not formed during long-term use like a conventional separating claw with a non-adhesive coating formed on the surface. Non-adhesiveness does not decrease due to abrasion, and the base material is not exposed to scratch the surface of rolls, etc., and yet highly rigid synthetic resins such as polyetheretherketone, polyamideimide, polyamide, polyimide, metals, and ceramics. Compared to the conventional separation claws manufactured using a rigid material such as, for example, the whole claws are softer, so the attack on the rolls etc. is also lower. Therefore, according to the separating claw of the present invention, it is possible to suppress image deterioration due to toner adhesion or damage to the roll surface for a long period of time,
It is possible to reduce maintenance costs such as inspection and repair of the copying machine. Moreover, since the entire structure including the support shaft and shaft hole is integrally molded with fluororesin, the entire claw is softer than the conventional separation claw that uses a rigid material as the base material, and the slidability of the shaft part is good. It is excellent and can follow the movement of rolls smoothly. For this reason, it is possible to cope with the speeding up of the copying machine, and it is possible to suppress the generation of sliding noise from the shaft portion and to achieve excellent quietness. In addition, since the whole is integrally molded, it has excellent dimensional accuracy.Therefore, as in the case of a separating claw in which a non-adhesive member is mechanically attached to a claw formed by using a rigid material as a base material, rolls are caused by a mounting dimension error. It does not damage the surface or interfere with the separation function of copy paper.
【図1】 複写機用分離爪の1例を示す斜視図。FIG. 1 is a perspective view showing an example of a separation claw for a copying machine.
【図2】 複写機用分離爪の他例を示す斜視図。FIG. 2 is a perspective view showing another example of a separation claw for a copying machine.
【図3】 分離爪を複写機に装着した状態の説明図。FIG. 3 is an explanatory view of a state in which the separation claw is attached to the copying machine.
【図4】 分離爪の先端角度の説明図。FIG. 4 is an explanatory view of a tip angle of the separation claw.
1、1a:複写機用分離爪、2:支軸、2a:軸孔、
3:付勢手段、4:取付軸、10:ロール、11:回転
軸、P:複写紙、θ:先端角度。1, 1a: Separation claw for copying machine, 2: Support shaft, 2a: Shaft hole,
3: biasing means, 4: mounting shaft, 10: roll, 11: rotating shaft, P: copy paper, θ: tip angle.
───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 2H033 AA16 AA25 BA16 BA19 BA20 2H071 BA41 DA08 DA12 DA21 3F053 AA19 AA21 LA02 LB03 4F071 AA26 AA27 BA01 BB05 BC07 ─────────────────────────────────────────────────── ─── Continued front page F-term (reference) 2H033 AA16 AA25 BA16 BA19 BA20 2H071 BA41 DA08 DA12 DA21 3F053 AA19 AA21 LA02 LB03 4F071 AA26 AA27 BA01 BB05 BC07
Claims (3)
樹脂にて一体成形された複写機用分離爪。1. A separating claw for a copying machine, which is integrally formed entirely of a fluororesin including a support shaft or a shaft hole portion.
された請求項1記載の複写機用分離爪。2. The separating claw for a copying machine according to claim 1, which is integrally molded by injection molding of a fluororesin.
フッ化プロピレン共重合樹脂(FEP)、四フッ化エチ
レン・パーフルオロアルコキシエチレン共重合樹脂(P
FA)、四フッ化エチレン・エチレン共重合樹脂(ET
FE)、ビニリデンフルオライド樹脂(PVDF)、ビ
ニルフルオライド樹脂(PVF)及びエチレン−クロロ
トリフルオロエチレン共重合樹脂(ECTFE)からな
る群の内から選択される少なくとも1種である請求項1
又は2に記載の複写機用分離爪。3. The fluororesin is tetrafluoroethylene / hexafluoropropylene copolymer resin (FEP), tetrafluoroethylene / perfluoroalkoxyethylene copolymer resin (P
FA), ethylene tetrafluoride / ethylene copolymer resin (ET
2. At least one selected from the group consisting of FE), vinylidene fluoride resin (PVDF), vinyl fluoride resin (PVF) and ethylene-chlorotrifluoroethylene copolymer resin (ECTFE).
Alternatively, the separating claw for a copying machine according to item 2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002037184A JP2003241557A (en) | 2002-02-14 | 2002-02-14 | Separating pawl for copying machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002037184A JP2003241557A (en) | 2002-02-14 | 2002-02-14 | Separating pawl for copying machine |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2003241557A true JP2003241557A (en) | 2003-08-29 |
Family
ID=27778870
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Application Number | Title | Priority Date | Filing Date |
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---|---|
JP (1) | JP2003241557A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006133624A (en) * | 2004-11-09 | 2006-05-25 | Ricoh Co Ltd | Fixing device and image forming apparatus |
JP2007140189A (en) * | 2005-11-18 | 2007-06-07 | Ricoh Co Ltd | Fixing device and image forming apparatus |
JP2009031759A (en) * | 2007-06-25 | 2009-02-12 | Ricoh Co Ltd | Separation plate, sheet conveyance mechanism, and image forming apparatus |
WO2012070401A1 (en) | 2010-11-24 | 2012-05-31 | 旭硝子株式会社 | Sliding member for sheet-shaped recording material detachment, seal ring for automobile, and seal ring and sliding member for industrial gas compressor |
-
2002
- 2002-02-14 JP JP2002037184A patent/JP2003241557A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006133624A (en) * | 2004-11-09 | 2006-05-25 | Ricoh Co Ltd | Fixing device and image forming apparatus |
JP2007140189A (en) * | 2005-11-18 | 2007-06-07 | Ricoh Co Ltd | Fixing device and image forming apparatus |
JP2009031759A (en) * | 2007-06-25 | 2009-02-12 | Ricoh Co Ltd | Separation plate, sheet conveyance mechanism, and image forming apparatus |
US7890039B2 (en) | 2007-06-25 | 2011-02-15 | Ricoh Company, Ltd. | Sheet separation device, sheet conveyance apparatus, and image forming system |
WO2012070401A1 (en) | 2010-11-24 | 2012-05-31 | 旭硝子株式会社 | Sliding member for sheet-shaped recording material detachment, seal ring for automobile, and seal ring and sliding member for industrial gas compressor |
KR20130107333A (en) | 2010-11-24 | 2013-10-01 | 아사히 가라스 가부시키가이샤 | Sliding member for sheet-shaped recording material detachment, seal ring for automobile, and seal ring and sliding member for industrial gas compressor |
US9388009B2 (en) | 2010-11-24 | 2016-07-12 | Asahi Glass Co., Ltd. | Sliding member for sheet-shaped recording material detachment, seal ring for automobile, and seal ring and sliding member for industrial gas compressor |
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