JPH06308851A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH06308851A JPH06308851A JP11538493A JP11538493A JPH06308851A JP H06308851 A JPH06308851 A JP H06308851A JP 11538493 A JP11538493 A JP 11538493A JP 11538493 A JP11538493 A JP 11538493A JP H06308851 A JPH06308851 A JP H06308851A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- roller
- fixing roller
- fixing
- pressure roller
- 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
- Fixing For Electrophotography (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は電子写真技術を利用した
画像形成装置において熱や圧力を利用して、画像を記録
材に定着する定着装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing device for fixing an image on a recording material by utilizing heat or pressure in an image forming apparatus using electrophotography.
【０００２】[0002]
【従来の技術】図９は画像形成装置を示す。図におい
て、往復動する原稿台ガラス２７上の原稿は照明ランプ
１２にて照明されその反射像光は短焦点レンズアレイ１
４をとおり、図示矢印方向に回転する感光ドラム１５上
に露光する。感光ドラム１５は一次帯電器１３により一
様に帯電しており、前記露光により感光ドラム１５上に
は潜像が形成され、次に現像器１６により現像され潜像
は現像画像となる。一方給紙カセット１７から給紙ロー
ラ１８で一枚宛送り出された記録材は搬送路１９をとお
り、レジストローラ２１で前記感光ドラム１５上の現像
画像とタイミングをとられて転写帯電器２２位置へ送り
込まれ現像画像を転写されて感光ドラム１５から分離
し、搬送ベルト２３で定着装置２４へ送り込まれ、この
定着装置２４の定着ローラ２と加圧ローラ３に挟圧され
乍ら送られ記録材上の未定着画像が定着され、排紙ロー
ラ２５でもって機外へ排出される。2. Description of the Related Art FIG. 9 shows an image forming apparatus. In the figure, the reciprocating document on the platen glass 27 is illuminated by the illumination lamp 12, and the reflected image light is reflected by the short focus lens array 1.
4, the photosensitive drum 15 rotating in the direction of the arrow in the drawing is exposed. The photosensitive drum 15 is uniformly charged by the primary charging device 13, a latent image is formed on the photosensitive drum 15 by the exposure, and then the latent image is developed by the developing device 16 to become a developed image. On the other hand, the recording material sent out from the sheet feeding cassette 17 by the sheet feeding roller 18 passes through the conveying path 19 and is moved to the position of the transfer charger 22 by the registration roller 21 in time with the developed image on the photosensitive drum 15. The developed image is transferred and separated from the photosensitive drum 15, and is sent to the fixing device 24 by the conveyor belt 23. The fixing roller 2 and the pressure roller 3 of the fixing device 24 are pressed against the recording material and sent. The unfixed image is fixed and discharged by the discharge roller 25 to the outside of the apparatus.
【０００３】このような画像形成部の各回転動部はギヤ
を介してモータ２６から駆動されている。Each rotating part of the image forming section is driven by a motor 26 via gears.
【０００４】このような定着装置２４では定着ローラ２
と加圧ローラ３が大きな力でもって圧接しており、単位
長さ当りの圧力の強さも大きいので長期間静止状態とし
ておくとクリープにより変形する。特に加圧ローラ３は
芯金上に厚い弾性体層を有するため変形量が大きくクリ
ープにより弾性を失わせられ易い。そこで画像形成装置
の製造時から使用開始までの間は定着ローラ２と加圧ロ
ーラ３を離しておくような圧解除手段を設けている。圧
解除手段は画像形成装置のカバーを外すと操作可能とな
っている。In such a fixing device 24, the fixing roller 2
Since the pressure roller 3 is pressed against each other with a large force and the strength of the pressure per unit length is also large, it deforms due to creep when left stationary for a long time. In particular, since the pressure roller 3 has a thick elastic layer on the cored bar, the amount of deformation is large and the elasticity is likely to be lost due to creep. Therefore, pressure releasing means is provided so that the fixing roller 2 and the pressure roller 3 are separated from each other from the time of manufacturing the image forming apparatus to the start of use. The pressure releasing means can be operated by removing the cover of the image forming apparatus.
【０００５】従来例の圧解除手段は図７，８に示される
ように定着ローラと加圧ローラの加圧を、手動で圧解除
位置と加圧位置の切り替えを行なうようになっている。
図８において、定着ローラ２と加圧ローラ３は画像形成
時は圧接回転して紙等の記録材を通過させ記録材上の未
定着画像を定着する。定着ローラ２は定着ローラ用軸受
７に支持されている。定着ローラ用軸受７は定着装置の
フレーム１に定着ローラ２と同心で回動可能に設けら
れ、回動するために圧解除レバー４を備え、又加圧ロー
ラ用軸受６の定着ローラ２に対向する山形面６ａと係脱
するカム７ａを突設してある。加圧ローラ３を回転自在
に支持している加圧ローラ用軸受６は定着ローラ２と加
圧ローラ３の中心を結ぶ線に平行で且つ該線を二等分線
とする位置に設けた案内面１ａに移動自在に嵌合してい
る。案内面１ａは定着装置のフレーム１に設けてある。
加圧ローラ用軸受６と定着装置のフレーム１に設けたバ
ネ座部材１ｂ間には定着ローラ２に加圧ローラ３を圧接
する加圧バネ５が縮設してある。As shown in FIGS. 7 and 8, the pressure releasing means of the conventional example is adapted to manually switch between the pressure releasing position and the pressure applying position of the fixing roller and the pressure roller.
In FIG. 8, the fixing roller 2 and the pressure roller 3 are pressed and rotated during image formation to pass a recording material such as paper and fix an unfixed image on the recording material. The fixing roller 2 is supported by a fixing roller bearing 7. The fixing roller bearing 7 is rotatably provided on the frame 1 of the fixing device so as to be concentric with the fixing roller 2, has a pressure release lever 4 for rotating, and faces the fixing roller 2 of the pressure roller bearing 6. A cam 7a that engages and disengages with the chevron surface 6a is projected. A pressure roller bearing 6 that rotatably supports the pressure roller 3 is a guide provided in a position parallel to a line connecting the centers of the fixing roller 2 and the pressure roller 3 and dividing the line into two bisectors. It is movably fitted to the surface 1a. The guide surface 1a is provided on the frame 1 of the fixing device.
Between the pressure roller bearing 6 and the spring seat member 1b provided on the frame 1 of the fixing device, the pressure spring 5 for pressing the pressure roller 3 to the fixing roller 2 is contracted.
【０００６】図７は定着ローラ用軸受７のカム７ａ部が
加圧ローラ用軸受６の山形面６ａ上にのり上げて加圧バ
ネ５を圧縮しており、圧解除レバー４は定着装置のフレ
ーム１に設けた上ストッパ１ｃに当接しており、定着ロ
ーラ２と加圧ローラ３が隙間ｄをおいて離れている。In FIG. 7, the cam 7a portion of the fixing roller bearing 7 is raised above the chevron surface 6a of the pressure roller bearing 6 to compress the pressure spring 5, and the pressure release lever 4 serves as the frame of the fixing device. The fixing roller 2 and the pressure roller 3 are in contact with the upper stopper 1c provided on the first roller 1, and are separated by a gap d.
【０００７】図７において圧解除レバー４を押し下げる
と定着ローラ用軸受７は時計回りに回動し、カム７ａは
山形面６ａ上を滑って加圧ローラ用軸受６から外れるの
で、加圧ローラ用軸受６は加圧バネ５のバネ力で前進し
て加圧ローラ用軸受６により支持されている加圧ローラ
３を定着ローラ２に圧接し図８のようになる。In FIG. 7, when the pressure release lever 4 is pushed down, the fixing roller bearing 7 rotates clockwise, and the cam 7a slides on the chevron surface 6a and comes off the pressure roller bearing 6. The bearing 6 moves forward by the spring force of the pressure spring 5, and the pressure roller 3 supported by the pressure roller bearing 6 is brought into pressure contact with the fixing roller 2 as shown in FIG.
【０００８】[0008]
【発明が解決しようとしている課題】しかしながら、上
記従来例では着荷時に一般ユーザー等が画像形成装置の
カバーを開け圧解除レバーを加圧側へ切り替えてから使
用しなければならず、次のような欠点があった。 （１） 圧解除レバーを加圧側へ切り替えず使用した場
合、紙詰りを発生させたり未定着の画像のまま用紙が排
紙されることになる。 （２） 一般ユーザーが圧解除レバーの切り替えを忘れ
ないように、注意を促すラベルを追加しなければならな
い。 （３） 圧解除レバーが一般ユーザーが操作する部品と
なるので、色および操作性を考慮しなければならずコス
トアップの要因となる。However, in the above-mentioned conventional example, the general user or the like must open the cover of the image forming apparatus and switch the pressure release lever to the pressurizing side before loading, so that the following disadvantages occur. was there. (1) If the pressure release lever is used without being switched to the pressure side, a paper jam may occur or the paper may be discharged as an unfixed image. (2) A label that calls attention should be added so that general users do not forget to switch the pressure release lever. (3) Since the pressure release lever is a component operated by a general user, color and operability must be taken into consideration, which causes a cost increase.
【０００９】本発明は定着ローラと加圧ローラの圧接を
解除する圧解除手段を備えた定着装置において、圧解除
手段を作用しない状態にするために特に人の操作を必要
としない定着装置を提供することを目的とする。The present invention provides a fixing device provided with a pressure releasing means for releasing the pressure contact between the fixing roller and the pressure roller, which does not require a human operation to bring the pressure releasing means into a non-operating state. The purpose is to do.
【００１０】[0010]
【課題を解決するための手段】本発明によれば装置の輸
送時や保存時、又は紙詰りの処理時に使われる定着ロー
ラと加圧ローラの圧接を解除する圧解除手段を備えた定
着装置において、圧解除手段の定着ローラと加圧ローラ
の圧接の解除状態から圧接状態への切り替えを、画像形
成装置本体の駆動力を利用して行なうことを特徴とした
定着装置としたことによって、圧解除手段が装置本体の
起動と同時に、装置本体の駆動力によって加圧側に切り
替えられるようにしたものである。According to the present invention, there is provided a fixing device having pressure releasing means for releasing pressure contact between a fixing roller and a pressure roller, which is used when the device is transported or stored, or when a paper jam is dealt with. By releasing the pressure of the fixing roller and the pressure roller of the pressure releasing means from the released state to the pressed state by using the driving force of the image forming apparatus main body, the pressure releasing is achieved. The means is adapted to be switched to the pressurizing side by the driving force of the apparatus body at the same time when the apparatus body is activated.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面に従って説明す
る。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】「実施例１」図１は本発明の最も良く特徴
を表わす実施例１の図であり、定着装置のフレーム１、
定着ローラ２、加圧ローラ３、加圧ローラ３を定着ロー
ラ２へ圧着させるための加圧バネ５、加圧バネを保持し
加圧ローラ３の軸受となる加圧ローラ用軸受６、定着ロ
ーラ２の軸受７等を備え、各部材相互の関係は従来例で
示したとおりであり、以下に異なる点をのべる。[First Embodiment] FIG. 1 is a view of a first embodiment showing the best feature of the present invention.
The fixing roller 2, the pressure roller 3, a pressure spring 5 for pressing the pressure roller 3 to the fixing roller 2, a pressure roller bearing 6 that holds the pressure spring and serves as a bearing of the pressure roller 3, and a fixing roller. The two bearings 7 and the like are provided, and the relationship between the respective members is as shown in the conventional example, and different points will be mentioned below.
【００１３】本例では定着ローラ用軸受７は定着装置の
フレーム１に固定されている。圧解除レバー４は加圧ロ
ーラ３の端部のジャーナル部３ａに圧解除レバー４の根
本が回転自在に嵌合しており、圧解除レバー４は加圧ロ
ーラ用軸受６と加圧ローラ３の定着ローラ２に接触する
外周部分の長手方向端部間にある。そして定着ローラ２
のローラ部分の長さは加圧ローラ３のローラ部分の長さ
よりも長く圧解除レバー４の処まででている。圧解除レ
バー４根本は加圧ローラ３の中心を中心とし、加圧ロー
ラ３の半径ｒよりもｄだけ大きくｒ＋ｄ＝Ｒの半径の円
弧部４ａとなっており、この円弧部４ａが終った位置か
らは加圧ローラ３の半径ｒ以内にある避退部４ｂに向っ
て続いている。In this example, the fixing roller bearing 7 is fixed to the frame 1 of the fixing device. The base of the pressure release lever 4 is rotatably fitted in the journal portion 3a at the end of the pressure roller 3 of the pressure release lever 4, and the pressure release lever 4 includes the bearing 6 for the pressure roller and the pressure roller 3. It is between the longitudinal end portions of the outer peripheral portion that contacts the fixing roller 2. And the fixing roller 2
The length of the roller portion is longer than the length of the roller portion of the pressure roller 3 and reaches the pressure release lever 4. The base of the pressure release lever 4 is an arc portion 4a having a radius r + d = R which is larger than the radius r of the pressure roller 3 by the center of the center of the pressure roller 3, and the position where the arc portion 4a ends. To the retracting portion 4b within the radius r of the pressure roller 3.
【００１４】図１のように圧解除レバー４を加圧ローラ
３のジャーナル部３ａを中心に反時計方向に回動して上
ストッパー１ｃに当接した位置では、圧解除レバー４の
円弧部４ａは、加圧バネ５のバネ力が加圧ローラ用軸受
６に加えられ、加圧ローラのジャーナル部３ａを介して
圧解除レバー４に加えられることによって、定着ローラ
２に圧接している。As shown in FIG. 1, at the position where the pressure release lever 4 is rotated counterclockwise around the journal portion 3a of the pressure roller 3 and abuts against the upper stopper 1c, the arc portion 4a of the pressure release lever 4 is provided. Is pressed against the fixing roller 2 by the spring force of the pressure spring 5 being applied to the pressure roller bearing 6 and being applied to the pressure release lever 4 via the journal portion 3 a of the pressure roller.
【００１５】製品出荷時に圧解除レバー４は加圧ローラ
３を定着ローラ２への圧接を解除する位置Ｂに設定され
ている。When the product is shipped, the pressure release lever 4 is set to the position B where the pressure roller 3 releases the pressure contact with the fixing roller 2.
【００１６】この状態で装置に電源が投入されると装置
は初期化のために前駆動動作を行ない、一定時間定着装
置２４が駆動される。When the power of the apparatus is turned on in this state, the apparatus performs a pre-driving operation for initialization, and the fixing device 24 is driven for a certain period of time.
【００１７】定着装置２４が駆動されると定着ローラ２
は図１の矢印方向へ回転し、定着ローラ２に圧接されて
いる圧解除レバー４の円弧部４ａは定着ローラ２と転動
するので圧解除レバー４は矢印方向に回され、定着ロー
ラ２との接触が外れたところで圧解除レバー４は自重で
図２に示す加圧位置Ａまで落ち下ストッパー１ｄに当っ
て停止する。When the fixing device 24 is driven, the fixing roller 2
1 rotates in the direction of the arrow in FIG. 1, and the arcuate portion 4a of the pressure release lever 4 pressed against the fixing roller 2 rolls with the fixing roller 2, so the pressure release lever 4 is rotated in the direction of the arrow and When the contact is released, the pressure release lever 4 falls to the pressing position A shown in FIG. 2 by its own weight and hits the lower stopper 1d to stop.
【００１８】ここで圧解除レバー４の円弧部４ａと定着
ローラ２の接触が外れ円弧部４ａにすぐつづく避退部４
ｂと定着ローラ２が接触し乍ら圧解除レバー４が回動す
るにつれて、加圧バネ５によって加圧ローラ用軸受６が
定着ローラ２に向って進み、加圧ローラ３は定着ローラ
２に圧接する。Here, the contact between the arc portion 4a of the pressure release lever 4 and the fixing roller 2 is released, and the retracting portion 4 immediately following the arc portion 4a.
As b and the fixing roller 2 come into contact with each other and the pressure release lever 4 rotates, the pressure roller bearing 6 advances toward the fixing roller 2 by the pressure spring 5, and the pressure roller 3 comes into pressure contact with the fixing roller 2. To do.
【００１９】従って、ユーザーは定着装置の定着ローラ
に加圧ローラを圧接する操作を必要としない。図２にお
いて圧解除レバー４を持上げると避退部４ｂの円弧部４
ａ近くが定着ローラ２に接触し、続いて加圧ローラ用軸
受６は加圧バネ５を加圧して後退し、円弧部４ａが定着
ローラ２に接して圧解除レバー４が上ストッパー１ｃに
当り停止する。定着ローラ２と円弧部４ａは定着ローラ
２と加圧ローラ３の中心を結ぶ線上で接しているので圧
解除レバー４には回転力が生じないので定着ローラ２と
加圧ローラ３は離れた状態を保持する。Therefore, the user does not need to press the pressure roller against the fixing roller of the fixing device. In FIG. 2, when the pressure release lever 4 is lifted, the arc portion 4 of the escape portion 4b is
The vicinity of a comes into contact with the fixing roller 2, and then the pressure roller bearing 6 presses the pressure spring 5 and retreats, the arc portion 4a contacts the fixing roller 2, and the pressure release lever 4 hits the upper stopper 1c. Stop. Since the fixing roller 2 and the arc portion 4a are in contact with each other on the line connecting the centers of the fixing roller 2 and the pressure roller 3, a rotational force is not generated in the pressure release lever 4, so that the fixing roller 2 and the pressure roller 3 are separated from each other. Hold.
【００２０】「実施例２」図３，４は実施例２を示し、
この図において符号１，２，３，５，６，７は実施例１
と同じものである。フレーム１に長軸方向に摺動可能な
ように取付けられた圧解除バー４０を設けてある。Example 2 FIGS. 3 and 4 show Example 2,
In this figure, reference numerals 1, 2, 3, 5, 6, and 7 indicate the first embodiment.
Is the same as. A pressure release bar 40 is provided on the frame 1 so as to be slidable in the long axis direction.
【００２１】圧解除バー４０は先端に直動カム部４１を
備えその柄部４２は定着装置のフレーム１に設けたブラ
ケット１ｆ，１ｇに設けた案内孔に滑合している。ブラ
ケット１ｆを一方のバネ座として柄部４２に挿入された
圧解除バー用バネ８は柄部４２に固定されたバネ座部材
４３に着座し縮設されている。The pressure release bar 40 has a linear cam portion 41 at its tip, and a handle portion 42 of the pressure release bar 40 slides into a guide hole provided in brackets 1f and 1g provided in the frame 1 of the fixing device. The pressure release bar spring 8 inserted in the handle portion 42 with the bracket 1f as one spring seat is seated on the spring seat member 43 fixed to the handle portion 42 and is compressed.
【００２２】圧解除レバー４０は定着ローラ２と加圧ロ
ーラ３の中心を結ぶ線に直交しており、直動カム部４１
は定着ローラ２と加圧ローラ用軸受６の間に出入り可能
となっている。直動カム部４１は先端に斜面カム４１ａ
が設けられ、斜面カム４１ａにつづいて二面幅部４１ｂ
が設けられている。二面幅部４１ｂは定着ローラ２と加
圧ローラ３の中心を結ぶ線に直交している。The pressure release lever 40 is orthogonal to the line connecting the centers of the fixing roller 2 and the pressure roller 3 and has a linear cam portion 41.
Can enter and leave between the fixing roller 2 and the pressure roller bearing 6. The linear cam portion 41 has a sloped cam 41a at the tip.
Is provided, followed by the slope cam 41a, followed by the width across flat portion 41b.
Is provided. The width across flats 41b is orthogonal to the line connecting the centers of the fixing roller 2 and the pressure roller 3.
【００２３】図３において圧解除バー４０は前進位置に
有り、その直動カム部４１の二面幅部４１ｂは定着ロー
ラ２と加圧ローラ用軸受６間に挟圧されている。この状
態では加圧ローラ用軸受６は加圧バネ５に抗して定着ロ
ーラ２から遠ざけられ、定着ローラ２に対して加圧ロー
ラ３が離れた圧着解除位置にある。定着ローラ２と加圧
ローラ用軸受６に挟み込まれた圧解除バー４０は加圧バ
ネ５の圧力でこの位置に圧解除バネ８のバネ力では移動
しないように保持されている。即ち、この状態では定着
ローラ２及び加圧ローラ用軸受６と二面幅部４１ｂによ
る摩擦力の方が圧解除バー用バネ８のバネ力よりも大き
くなるように圧解除バー用バネ８の仕様を定めてある。In FIG. 3, the pressure release bar 40 is at the forward position, and the width across flats 41b of the linear cam portion 41 is sandwiched between the fixing roller 2 and the pressure roller bearing 6. In this state, the pressure roller bearing 6 is moved away from the fixing roller 2 against the pressure spring 5, and the pressure roller 3 is in a pressure release position separated from the fixing roller 2. The pressure release bar 40 sandwiched between the fixing roller 2 and the pressure roller bearing 6 is held at this position by the pressure of the pressure spring 5 so as not to move by the spring force of the pressure release spring 8. That is, in this state, the specifications of the pressure release bar spring 8 are such that the frictional force between the fixing roller 2 and the pressure roller bearing 6 and the width across flats 41b is larger than the spring force of the pressure release bar spring 8. Has been set.
【００２４】画像形成装置が駆動され、定着ローラ２が
矢印方向に回転すると加圧ローラ用軸受６と二面幅部４
１ｂの間の摩擦力よりも圧解除バー用バネ８のバネ力と
定着ローラ２と二面幅部４１ｂとの間の圧接駆動力の合
計が大きくなるので圧解除バー４０は後退方向に定着ロ
ーラ２と加圧ローラ用軸受６間から押し出され、圧解除
バー用バネ８によって加圧位置Ａに保持される。一方加
圧ローラ用軸受６は加圧バネ５のバネ力で前進し、加圧
ローラ３は加圧バネ５のバネ力により定着ローラ２に圧
接される。When the image forming apparatus is driven and the fixing roller 2 rotates in the direction of the arrow, the pressure roller bearing 6 and the width across flat portion 4 are provided.
Since the sum of the spring force of the pressure release bar spring 8 and the pressure contact drive force between the fixing roller 2 and the width across flats 41b is larger than the frictional force between the pressure release bar 1b, the pressure release bar 40 moves backward in the fixing roller. It is pushed out between the bearing 2 and the pressure roller bearing 6, and is held at the pressure position A by the pressure release bar spring 8. On the other hand, the pressure roller bearing 6 advances by the spring force of the pressure spring 5, and the pressure roller 3 is pressed against the fixing roller 2 by the spring force of the pressure spring 5.
【００２５】「実施例３」図５，６は実施例３を示し、
符号１，２，３，５，６は実施例１と同じものであり、
定着装置のフレーム１に回転可能に取り付けられた定着
ローラ用軸受７に取付けられた圧解除レバー４を備えて
いる。定着ローラ２に固定されたギヤ９は定着ローラ２
に本体からの駆動を伝える駆動ギヤ１０と噛合ってい
る。駆動ギヤ１０に固定された軸１０ａに設けた不図示
のワンウエイクラッチで取付けられたワンウエイギヤ１
１を備えている。[Third Embodiment] FIGS. 5 and 6 show a third embodiment.
Reference numerals 1, 2, 3, 5 and 6 are the same as those in the first embodiment,
The pressure releasing lever 4 is attached to a fixing roller bearing 7 rotatably attached to the frame 1 of the fixing device. The gear 9 fixed to the fixing roller 2 is the fixing roller 2
It meshes with the drive gear 10 that transmits the drive from the main body. One-way gear 1 mounted by a one-way clutch (not shown) provided on a shaft 10a fixed to the drive gear 10.
1 is provided.
【００２６】図５は定着ローラ２と加圧ローラ３の圧解
除状態を示し、この時圧解除レバー４はＢ側の位置にあ
り、定着ローラ用軸受７のセグメントギヤ部７ｂがワン
ウエイギヤ１１とかみ合い、カム７ａが加圧ローラ用軸
受６を押し下げて加圧ローラ３が定着ローラ２と接しな
いようになっている。FIG. 5 shows the pressure release state of the fixing roller 2 and the pressure roller 3. At this time, the pressure release lever 4 is at the B side position, and the segment gear portion 7b of the fixing roller bearing 7 becomes the one-way gear 11. The cam 7a presses down the pressure roller bearing 6 so that the pressure roller 3 does not come into contact with the fixing roller 2.
【００２７】この状態で画像形成装置の本体側から駆動
力が伝えられると駆動ギヤ１０が時計方向に回転し、定
着ローラギヤ９を回転させて定着ローラ２を回転させ、
さらにワンウエイクラッチで連結されたワンウエイギヤ
１１を回転させる。ワンウエイギヤ１１とかみ合ってい
るセグメントギヤ部７ｂは反時計方向に回転することに
なり定着ローラ用軸受７を回転させるのでカム７ａは加
圧ローラ用軸受６から外れ、加圧ローラ用軸受６の押え
がなくなり加圧バネ５のバネ力によりこの軸受６は前進
し、この軸受６と共に前進した加圧ローラ３は定着ロー
ラ２に圧接することになる。In this state, when the driving force is transmitted from the main body of the image forming apparatus, the driving gear 10 rotates clockwise, the fixing roller gear 9 rotates, and the fixing roller 2 rotates.
Further, the one-way gear 11 connected by the one-way clutch is rotated. The segment gear portion 7b meshed with the one-way gear 11 rotates counterclockwise and rotates the fixing roller bearing 7, so that the cam 7a is disengaged from the pressure roller bearing 6 and the pressure roller bearing 6 is pressed. The bearing 6 advances due to the spring force of the pressure spring 5, and the pressure roller 3 that has advanced together with the bearing 6 comes into pressure contact with the fixing roller 2.
【００２８】加圧ローラ３の圧解除を行なうときには、
圧解除レバー４をＡからＢに回転させ、この時圧解除レ
バー４のカム７ａが加圧ローラ用軸受６を後退させ加圧
ローラ３を定着ローラ２より離すと同時にセグメントギ
ヤ部７ｂがワンウエイギヤ１１とかみ合う。この時ワン
ウエイギヤ１１は反時計方向に回転するが、ワンウエイ
クラッチによってこの回転は駆動ギヤ１０には伝えられ
ない。When the pressure of the pressure roller 3 is released,
The pressure release lever 4 is rotated from A to B, and at this time, the cam 7a of the pressure release lever 4 retracts the pressure roller bearing 6 to separate the pressure roller 3 from the fixing roller 2 and at the same time, the segment gear portion 7b is a one-way gear. Mesh with 11. At this time, the one-way gear 11 rotates counterclockwise, but this rotation is not transmitted to the drive gear 10 by the one-way clutch.
【００２９】[0029]
【発明の効果】以上説明したように、定着装置の圧解除
手段を加圧側に切り替えるのを本体側の駆動力を利用す
ることで、一般ユーザーが圧解除手段を加圧側に切り替
える必要が無くなり、それによって圧解除レバーを切り
替えるようにユーザーに説明する注意書きも必要なくな
る効果がある。As described above, by using the driving force on the main body side to switch the pressure releasing means of the fixing device to the pressure side, the general user does not need to switch the pressure releasing means to the pressure side, This has the effect of eliminating the need for cautionary notes to explain to the user to switch the pressure release lever.
【図１】本発明の実施例１の圧解除状態を示す側面図で
ある。FIG. 1 is a side view showing a pressure released state according to a first embodiment of the present invention.
【図２】本発明の実施例１の圧接状態を示す側面図であ
る。FIG. 2 is a side view showing a pressure contact state according to the first embodiment of the present invention.
【図３】本発明の実施例２の圧解除状態を示す側面図で
ある。FIG. 3 is a side view showing a pressure released state according to the second embodiment of the present invention.
【図４】本発明の実施例２の圧接状態を示す側面図であ
る。FIG. 4 is a side view showing a pressure contact state according to the second embodiment of the present invention.
【図５】本発明の実施例３の圧解除状態を示す側面図で
ある。FIG. 5 is a side view showing a pressure released state according to a third embodiment of the present invention.
【図６】本発明の実施例３の圧接状態を示す側面図であ
る。FIG. 6 is a side view showing a pressure contact state of the third embodiment of the present invention.
【図７】従来例の圧解除状態を示す側面図である。FIG. 7 is a side view showing a pressure released state of a conventional example.
【図８】従来例の圧接状態を示す側面図である。FIG. 8 is a side view showing a pressure contact state of a conventional example.
【図９】画像形成装置の縦断面図である。FIG. 9 is a vertical sectional view of the image forming apparatus.
１ 定着装置のフレーム ２ 定着ローラ ３ 加圧ローラ ４ 圧解除レバー ５ 加圧バネ ６ 加圧ローラ用軸受 ７ 定着ローラ用軸受 ８ 解除バー用バネ ９ 定着ローラギヤ １０ 駆動ギヤ １１ ワンウエイギヤ ４０ 圧解除バー 1 frame of fixing device 2 fixing roller 3 pressure roller 4 pressure release lever 5 pressure spring 6 pressure roller bearing 7 fixing roller bearing 8 release bar spring 9 fixing roller gear 10 drive gear 11 one-way gear 40 pressure release bar
Claims (1)
る圧解除手段を備えた定着装置において、定着ローラと
加圧ローラの圧接の解除状態から圧接状態への切り替え
を、画像形成装置本体の駆動力を利用して行なうことを
特徴とした定着装置。1. In a fixing device having a pressure releasing means for releasing the pressure contact between the fixing roller and the pressure roller, switching from the release state of the pressure contact between the fixing roller and the pressure roller to the pressure contact state is performed in the main body of the image forming apparatus. A fixing device characterized by being driven by driving force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11538493A JPH06308851A (en) | 1993-04-19 | 1993-04-19 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11538493A JPH06308851A (en) | 1993-04-19 | 1993-04-19 | Fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06308851A true JPH06308851A (en) | 1994-11-04 |
Family
ID=14661210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11538493A Pending JPH06308851A (en) | 1993-04-19 | 1993-04-19 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06308851A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007256875A (en) * | 2006-03-27 | 2007-10-04 | Canon Inc | Image heating device |
| JP2007298715A (en) * | 2006-04-28 | 2007-11-15 | Fuji Xerox Co Ltd | Fixing device and image forming apparatus |
| WO2011000285A1 (en) * | 2009-07-02 | 2011-01-06 | 珠海赛纳科技有限公司 | Fixing apparatus for imagiing device |
| JP2012008376A (en) * | 2010-06-25 | 2012-01-12 | Brother Ind Ltd | Fixing device and image forming apparatus |
-
1993
- 1993-04-19 JP JP11538493A patent/JPH06308851A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007256875A (en) * | 2006-03-27 | 2007-10-04 | Canon Inc | Image heating device |
| JP2007298715A (en) * | 2006-04-28 | 2007-11-15 | Fuji Xerox Co Ltd | Fixing device and image forming apparatus |
| WO2011000285A1 (en) * | 2009-07-02 | 2011-01-06 | 珠海赛纳科技有限公司 | Fixing apparatus for imagiing device |
| JP2012008376A (en) * | 2010-06-25 | 2012-01-12 | Brother Ind Ltd | Fixing device and image forming apparatus |
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