JPS60244985A - Preventing device for winding of sheet material - Google Patents

Abstract

PURPOSE:To easily prevent a sheet material from being wound by forming the fulcrum part of a wind preventing piece at the bottom of a groove which is open in the opposite direction, energizing a support shaft in such a direction that it is pressed against the bottom part of the groove, and energizing the tip part of a separation claw until it contacts the surface of a rotating body. CONSTITUTION:The separation claw 1 is formed of a heat-resisting material such as polyamide and its tip 1a is rounded off to a <=1mm. radius; and a projection 1b is formed in the middle of a triangle spreading to the rear part. The lower part 2a of a U- shaped member 2 is formed on the top surface of the separation claw 1 in one body and made open to the rear part as well as the upper part 2e of the U-shaped part 2. The wind preventing piece 3 consisting of the U-shaped part 2 and separation claw 1 is supported by a lower support shaft 6 and an upper spring shaft 5 provided to a U-shaped holding member 4. The holding member 4 has an opening C, where the part 2a of the U-shaped part is inserted. A spring 7 coiled from a center part 7a in the opposite direction energizes the projection 1b counterclockwise with its end part 7b. Consequently, the tip 1a of the separation claw 1 abuts on a fixing roller which is not shown in a figure to prevent the sheet from being wound by the support shaft 6 and spring 7, facilitating the replacement of the separation claw.

Description

【発明の詳細な説明】 本発明は複写機あるいは印刷機等忙おける定着ローラ或
いは感光体等の回転体上に巻付こうとするシート材を該
回転体から剥離する巻付防止装ｆｌｌＫ関し、特に取付
け、取外しの容易な巻付防止装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wrapping prevention device fllK for peeling a sheet material that is about to be wrapped around a rotating body such as a fixing roller or a photoreceptor in a busy copying machine or printing machine from the rotating body, In particular, it relates to an anti-wrapping device that is easy to install and remove.

乾式電子複写機では、シート材例えば感光紙や転写紙上
に形成した粉僚を定着する必要があるが、その際ローラ
を含むローラ定着装置が多くの場合用いられる。この四
−ラは転写紙が巻付かないよ５に、シリコン！ム、フツ
ノｆム。In a dry type electronic copying machine, it is necessary to fix particles formed on a sheet material such as photosensitive paper or transfer paper, and in this case, a roller fixing device including a roller is often used. The transfer paper won't wrap around this 4-ra. 5. It's silicone! Mu, Futunom fmu.

フｅｔａシリコンｆム等の耐熱性の弾性体層又は、テフ
レン（ＰＴＦＢ、ＰＦム）等の耐熱性樹脂等の離型性材
料を有する表面を具備するが、それにも拘わらず、トナ
ーがオフセット現象によりその表面に附着するときは、
巻付きの生ずるのを免かれない０％に、近年の複写機の
高速化、省電力化により上記の巻き付き現象が激しくな
ってき“　ている、また、自動両面複写等５のシステム
化が進みシリコンオイル雫の離麗剤のｐ−ラ表面への塗
布量が制限されているため、はとんどの場合に巻付防止
片としての分離爪にたよって転写紙を剥離しなければな
らなくなってきている。Although the toner is provided with a surface having a release material such as a heat-resistant elastic layer such as a silicone film or a heat-resistant resin such as Tefrene (PTFB, PF film), the toner does not exhibit an offset phenomenon. When attached to the surface by
The above-mentioned wrapping phenomenon has become more severe due to the speeding up and power saving of copying machines in recent years, and with the advancement of systems such as automatic double-sided copying5, silicon Because the amount of oil droplet release agent applied to the P-La surface is limited, in most cases it is necessary to rely on the separation claws that act as anti-wrapping pieces to peel off the transfer paper. There is.

一方、分離爪の材質はポリフェニレンサルファイド、Ｉ
リアミドイミド、ｆリイ電ド等の耐熱樹脂材料や金属表
面にフッ素樹脂等の離型性被覆をしたものが使われるが
、転写材を安定して分離するためＫは、その先端の丸め
の半径な１００μ講以下にしておかなければならず、そ
の先端の摩耗やジャム等による損傷により十分な耐久性
が得られていないのが現状でアル。On the other hand, the material of the separation claw is polyphenylene sulfide, I
Heat-resistant resin materials such as liamide-imide and f-liden are used, and metal surfaces coated with release properties such as fluororesin are used, but in order to stably separate the transfer material, K is the radius of the rounding of the tip. It must be kept under 100μ, and at present it is not sufficiently durable due to wear and damage to the tip due to jams, etc.

しかしながら、従来機においては分離爪は通常軸上に固
定され、更に該軸が装置本体に設けであるフレームによ
り支持されているため、分離爪を交換しようとしても迅
速な処理が困難であるという不便さがあった。However, in conventional machines, the separation claws are usually fixed on a shaft, and the shaft is further supported by a frame provided on the main body of the device, so it is inconvenient that it is difficult to replace the separation claws quickly. There was a time.

本発明は、上述従来例の欠点を改良し、巻付防止片の交
換をねじや緊定ワッシャ等の取り外しをすることもなく
、取付け、取外しの容易なシート材巻付防止装置を提供
することを目的とする。The present invention improves the drawbacks of the conventional example described above, and provides a sheet material wrapping prevention device that can be easily installed and removed without removing screws, fastening washers, etc. when replacing wrapping prevention pieces. With the goal.

以下、本発明の実施例を図面により説明する。Embodiments of the present invention will be described below with reference to the drawings.

第１図は本発明の実施例を示す一部断面を含む側面図で
あり、第一図は第７図の斜視図であり、第３図は回転体
に対する巻付防止装置の関係位置を示す側面図である。Fig. 1 is a side view including a partial cross section showing an embodiment of the present invention, Fig. 1 is a perspective view of Fig. 7, and Fig. 3 shows the relative position of the anti-wrapping device with respect to the rotating body. FIG.

分離爪ｌは／　ＩＪフェニレンサルファイド、Ｉリアミ
ドイミド、ｆリイミド等の耐熱材料でできており、その
先端／ａは丸めの半径０１ｍ以下の鋭利な断面形状を有
し、後端部に向って広がっている三角形断面をしていて
、両側面のほぼ中央部に円筒形の突起／ｂを備えている
。分離爪ｌの上面にＵ形部材−の下部材コａが一体に成
形され、Ｕ形部材ａの上部材コ・と下部材コａとで形成
される溝コｂは分離爪ｌの後方に開いている。そして分
離爪ｌとＵ形部材コとにより巻付防止片３が構成されて
いる。The separation claw l is made of a heat-resistant material such as IJ phenylene sulfide, I liamide imide, f liamide imide, etc., and its tip /a has a sharp cross-sectional shape with a rounding radius of 01 m or less, and it widens toward the rear end. It has a triangular cross section, and is provided with a cylindrical protrusion /b approximately at the center of both sides. The lower part core a of the U-shaped member is integrally molded on the upper surface of the separating claw l, and the groove b formed by the upper part of the U-shaped member a and the lower part core a is located behind the separating claw l. is open. A wrapping prevention piece 3 is constituted by the separating claw l and the U-shaped member.

保持部材グはコ形をしていて、両側のフランジ４ｔａに
は直交する水平方向のばね軸Ｓが上部に、支軸６が下部
に固定されている。The holding member has a U-shape, and a perpendicular horizontal spring shaft S is fixed to the upper part of the flanges 4ta on both sides, and a support shaft 6 is fixed to the lower part.

基部＋ｂの中央部に開口ｌＩｃを備えている。An opening lIc is provided at the center of the base +b.

Ｕ形部材コの溝コｂが支軸６に挿入され、更に■形部材
−の下部材２＆が保持部材ダの基部ｐｂの開口４ｔａＫ
挿入されている。ばね軸！に取付けである巻ばね７は中
央部７ａより互に逆方向に巻かれ、両端部りｂは分離爪
ｌの突起／ｂを反時計方向に附勢し、中央部７ａはＵ形
部材コの右上部より左下方に押圧してＵ形部材−を支軸
Ａに押しつげている。このようにして巻付防止装置ざが
構成され、従って、巻ばね７により、巻付防止片３は支
軸ルを中心に第１図紙面忙向って反時計方向に附勢され
、第２図に示すように、Ｕ形部材−の溝コｂの底である
支点部コＣは支軸ルに当接し、下部材コａの先端部の下
面は支持部材ダの基部ｌｌｂの開口Ｑａの下面に当接し
ている。The groove b of the U-shaped member is inserted into the support shaft 6, and the lower member 2 & of the ■-shaped member is inserted into the opening 4taK of the base pb of the holding member da.
It has been inserted. Spring shaft! The coil springs 7 are wound in opposite directions from the center part 7a, and both end parts b urge the protrusion/b of the separation claw l in the counterclockwise direction, and the center part 7a is wound in opposite directions from the center part 7a. The U-shaped member is pressed against the support shaft A by pressing from the upper right to the lower left. In this way, the anti-wrapping device is constructed, and the anti-wrap piece 3 is biased by the coil spring 7 in a counterclockwise direction from the plane of the paper in FIG. As shown in , the fulcrum C, which is the bottom of the groove b of the U-shaped member, is in contact with the support shaft, and the lower surface of the tip of the lower member core a is the lower surface of the opening Qa of the base llb of the support member D. is in contact with.

第３図に示すよ５Ｋ、シート材巻付防止装置Ｓは定着ロ
ーラ９と加圧ｐ−ラｌＯで定着されたシート材を排紙ロ
ーラ対１／に導く支持部材ｌ−に保持部材ダの両フラン
ジ１ｍの外面で固定されていて、分離爪Ｉの先端／ａが
定着ローラ９に当接し、先端／ｌを通る切線／３は支軸
６の中心より定着ローラ９側忙あり、Ｕ形部材−の下部
材コａの下面は保持部材亭の開口ダＣの下面に対しすき
間／４１があるようになっている。As shown in FIG. 3, the sheet material wrapping prevention device S is configured to attach a holding member to a support member l- which guides the sheet material fixed by the fixing roller 9 and the pressure p-ra lO to the paper ejection roller pair 1/. It is fixed on the outer surface of both flanges 1m, the tip /a of the separation claw I contacts the fixing roller 9, and the cutting line /3 passing through the tip /l is on the side of the fixing roller 9 from the center of the support shaft 6, making it U-shaped. There is a gap /41 between the lower surface of the lower member core a and the lower surface of the opening C of the holding member bow.

分離爪ｌの先端／ＩＬは定着ローラ９の表面に圧接して
いて、シート材が定着ローラ９に巻付き先端／＆に突き
嶺って分離される場合はその反力は支軸６で受け、支軸
６を中心に分離爪ｌは反時計方向に附勢される。所謂喰
い込み勝手の位置にあり、先端／ａが巻付きシート材に
より定着ローラ９表面に押し付けられるようになる通常
の分離爪の状態と同様に機能する。、巻付防止片３を取
り外す場合は支持部材／Ｊと共にシート材巻付防止装置
ｔを外して装置外に取出す。保持部材ダから巻ばねりの
附勢に抗して巻付防止片３を第１図に示す矢印Ａ方向に
引張れば先づ下部材コａが開口４１ｃより外れ、支軸６
から溝Ｊｂが外れ、取出すことが出来る。The tip /IL of the separation claw l is in pressure contact with the surface of the fixing roller 9, and when the sheet material wraps around the fixing roller 9 and is separated by reaching the tip /&, the reaction force is received by the support shaft 6. , the separation claw l is biased counterclockwise around the support shaft 6. It is in the so-called biting position, and functions in the same manner as a normal separation claw in which the leading edge /a is pressed against the surface of the fixing roller 9 by the wrapped sheet material. When removing the wrapping prevention piece 3, remove the sheet material wrapping prevention device t together with the support member /J and take it out of the apparatus. If the anti-wrapping piece 3 is pulled from the holding member DA in the direction of the arrow A shown in FIG.
The groove Jb comes off and can be taken out.

取り外した後は巻ばねりの中央部？ａと端部りｂは支軸
６を挾んだ形に係止する。Is it the center of the coiled spring after removing it? a and the end portion b engage with the support shaft 6 in a sandwiched manner.

巻付防止片３を保持部材ダに取付ける場合はまずＵ形部
材コの上部材コ・の上端部で巻ばねりの中央部りａを押
し拡げるよう引掛け、溝コｂを音軸６に挿入し、次に突
起／ｌ）を巻ばねりの端部７ｂ＆Ｃ引掛は開口１ｅＫＵ
形部材コの下部材コ・を挿入さくｙ−ら、押し込んでゆ
くと、Ｕ形部材−の支点部コＣの裏面は巻ばね７の附勢
に押し付けられ、反時計方向の回転力を附勢された状態
で第一図に示すように固定され噂る。かくして組立った
シート材巻付防止・装置ざを支持部材／ＪＩＣ固定し、
支持部材ｌコを装置内に持ち込み、装置の枠に固定する
。When attaching the winding prevention piece 3 to the holding member DA, first hook the center part a of the coil spring with the upper end of the upper member KO of the U-shaped member so as to spread it out, and then attach the groove KO to the sound axis 6. Insert, then wrap the protrusion/l) and hook the ends 7b & C of the spring into the opening 1eKU
As the lower part of the U-shaped member is inserted and pushed in, the back surface of the fulcrum part C of the U-shaped member is pressed by the force of the coil spring 7, applying a counterclockwise rotational force. In the energized state, it is fixed and spread as shown in Figure 1. The thus assembled sheet material wrapping prevention/device was fixed to the support member/JIC,
Bring the support member into the device and fix it to the frame of the device.

以上説明したように、本発明はシート部材の回転体への
巻付きを防止する巻付防止片の支点部を該巻付防止片の
先端と反対の方向に開いた溝で形成し、溝の底部で支軸
に圧接する方向に巻付防止片を附勢し、かつ支軸を中心
に巻付防止片を上記回転体の表面に当接する方向に附勢
する附勢部材を備えたシート材巻付防止装置九より、そ
の巻付防止片の分離爪先端が回転体に当接しているとい
う簡単な構成で、巻付防止の機能を充分満足し乍ら、容
易に着脱でき、定期交換を避けることのできない分離爪
の交換に要する時間を大幅に短縮できるという効果があ
る。As explained above, the present invention forms the fulcrum part of the wrapping prevention piece that prevents the sheet member from wrapping around the rotating body with a groove that opens in the opposite direction to the tip of the wrapping prevention piece. A sheet material provided with a biasing member that biases a wrap prevention piece in a direction in which the bottom part presses against a support shaft, and that biases the wrap prevention piece in a direction in which it comes into contact with the surface of the rotating body around the support shaft. The wrapping prevention device 9 has a simple configuration in which the tip of the separation claw of the wrapping prevention piece is in contact with the rotating body, and while it fully satisfies the wrapping prevention function, it can be easily attached and removed and requires periodic replacement. This has the effect of greatly reducing the time required to replace the separation claws, which cannot be avoided.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の実施例を示す一部断面を含む側面図、
第２図は第７図の斜視図、第３図は本発明の実施例を実
機に装備した状態の側面図である。 ｌ・・・分離爪　コ・・・Ｕ形部材　３・・・巻付防止
片ダ・・・保持部材　よ・・・ばね軸　６・・・支軸　
７・・・巻ばね　ｇ・・・シート材巻付防止装置　デ・
・・定着は一部　ｌコ・・・支持部材　１３・・・切線
。 特許出願人　キャノン株式会社 代理人　新井一部 第３図FIG. 1 is a side view including a partial cross section showing an embodiment of the present invention;
FIG. 2 is a perspective view of FIG. 7, and FIG. 3 is a side view of an actual machine equipped with an embodiment of the present invention. L... Separation claw C... U-shaped member 3... Wrap prevention piece D... Holding member Y... Spring shaft 6... Support shaft
7... Coiled spring g... Sheet material wrapping prevention device De...
・・Fixation is partial ・・・Supporting member 13・・Section line. Patent Applicant Canon Co., Ltd. Agent Arai Section Figure 3

Claims (1)

【特許請求の範囲】[Claims] ｌ　シート部材の回転体への巻付を防止する巻付防止片
の支点部を該巻付防止片の先端と反対の方向に開いた溝
で形成し、溝の底部で支軸に圧接する方向に巻付防止片
を附勢し、かつ、支軸を中心に巻付防止片を上記回転体
の表面に当接する方向に附勢する附勢部材を備えたシー
ト材巻付防止装置。l The supporting point of the wrapping prevention piece that prevents the sheet member from wrapping around the rotating body is formed by a groove that opens in the opposite direction to the tip of the wrapping prevention piece, and the bottom of the groove presses against the support shaft. A sheet material wrapping prevention device comprising a biasing member that biases a wrapping prevention piece on a support shaft and urges the wrapping prevention piece in a direction in which the wrapping prevention piece comes into contact with the surface of the rotating body.