JP2977928B2 - Electrophotographic device fixing device - Google Patents
Electrophotographic device fixing deviceInfo
- Publication number
- JP2977928B2 JP2977928B2 JP3078471A JP7847191A JP2977928B2 JP 2977928 B2 JP2977928 B2 JP 2977928B2 JP 3078471 A JP3078471 A JP 3078471A JP 7847191 A JP7847191 A JP 7847191A JP 2977928 B2 JP2977928 B2 JP 2977928B2
- Authority
- JP
- Japan
- Prior art keywords
- roller
- pressure roller
- gear
- pressure
- heating 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.)
- Expired - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】この発明は、レーザプリンタ・レ
ーザ複写機・レーザファクシミリなど、電子写真方式
（感光体に形成した画像を用紙・封筒などのシートに転
写して記録を行う方式）によりシートに記録を行う電子
写真装置に適用しうる。詳しくは、そのような電子写真
装置において、駆動源からの回転を歯車列を介して加熱
ロ−ラに伝達し、その加熱ロ−ラをそれに押し当てる加
圧ロ−ラとともに回転し、それらのロ−ラ間に導いた転
写後のシートを搬送しながらそのシート上の転写画像を
定着する定着器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic method (a method in which an image formed on a photoreceptor is transferred to a sheet such as a sheet of paper or an envelope for recording), such as a laser printer, a laser copying machine or a laser facsimile. The present invention can be applied to an electrophotographic apparatus for performing recording on a recording medium. More specifically, in such an electrophotographic apparatus, rotation from a driving source is transmitted to a heating roller via a gear train, and the heating roller rotates together with a pressure roller pressing against the heating roller. The present invention relates to a fixing device for fixing a transferred image on a transferred sheet while conveying the transferred sheet guided between rollers.
【０００２】[0002]
【従来の技術】従来、この種の定着器は、たとえば図４
に示すようにケース１に収納して加熱ロ−ラ２及びそれ
に押し当てる加圧ロ−ラ３を備える。そして、前記加熱
ロ−ラ２は、加熱ロ−ラ軸４をケース１の側板に軸受す
る。一方、前記加圧ロ−ラ３は、その加圧ロ−ラ軸５を
加圧アーム７で支えて支持する。前記加圧アーム７は、
基端６を中心として回動自在とし、先端７ａに付勢バネ
８を掛け前記基端６を中心としてそれに図中時計方向の
回動習性を与えてなり、これにより加圧ロ−ラ３を前記
加熱ロ−ラ２に押し当てる構成としていた。2. Description of the Related Art Conventionally, this type of fixing device is, for example, shown in FIG.
As shown in (1), a heating roller 2 housed in a case 1 and a pressure roller 3 pressed against the heating roller 2 are provided. The heating roller 2 supports the heating roller shaft 4 on the side plate of the case 1. On the other hand, the pressure roller 3 supports and supports the pressure roller shaft 5 with a pressure arm 7. The pressure arm 7 includes
The pressurizing roller 3 is made rotatable around the base end 6, and a biasing spring 8 is applied to the front end 7 a to give a clockwise turning behavior to the base end 6. It was configured to be pressed against the heating roller 2.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
定着器では、前記付勢バネ８の付勢力のバラツキや加圧
ロ−ラ軸５と加圧アーム７間の摩擦力の差などにより、
加圧ロ−ラ３と加熱ロ−ラ２との圧接部分のニップ巾が
異なり、定着状態が不均一になる問題があった。また、
これら加熱ロ−ラ２と加圧ロ−ラ３の間でジャムした場
合、付勢バネ８の付勢力を解除してジャムを処理する図
示しない付勢解除機構が必要なので、構造が複雑になり
コストアップになる問題があった。However, in the conventional fixing device, due to the variation in the urging force of the urging spring 8 and the difference in the frictional force between the pressure roller shaft 5 and the pressure arm 7, the conventional fixing device has a problem.
There is a problem that the nip width of the pressure contact portion between the pressure roller 3 and the heating roller 2 is different, and the fixing state is not uniform. Also,
When a jam occurs between the heating roller 2 and the pressure roller 3, a biasing release mechanism (not shown) for releasing the biasing force of the biasing spring 8 to clear the jam is required, and the structure becomes complicated. There was a problem that cost increased.
【０００４】そこで、この発明の目的は、加圧ロ−ラを
付勢する付勢バネ、及び付勢バネの付勢を解除する付勢
解除機構を不要にして定着を均一にすること及びコスト
ダウンを図ることにある。SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate the need for an urging spring for urging a pressure roller and an urging release mechanism for releasing the urging of the urging spring, and to achieve uniform fixing and cost. The idea is to go down.
【０００５】[0005]
【課題を解決するための手段】そのため、請求項１に記
載の発明は、以下の図示実施例に示すとおり、駆動源か
らの回転を歯車列３６を介して加熱ロ−ラ３１に伝達
し、その加熱ロ−ラ３１をそれに押し当てる加圧ロ−ラ
３２とともに回転し、それらのロ−ラ３１・３２間に導
いた転写後のシート１２を搬送しながらそのシート１２
上の転写画像を定着する電子写真装置の定着器２１にお
いて、前記加圧ロ−ラ３２と同軸に加圧ロ−ラ歯車３９
を設け、その加圧ロ−ラ歯車３９に前記歯車列３６から
の回転を伝達する中間歯車４５を設け、その中間歯車４
５から回転が伝達されているとき前記加圧ロ−ラ３２を
加圧位置に案内し、伝達されていないとき退避位置に案
内するガイド部材４２を設けてなることを特徴とする。According to the first aspect of the present invention, the rotation from a driving source is transmitted to a heating roller 31 via a gear train 36, as shown in the following embodiment. The heating roller 31 is rotated together with a pressure roller 32 for pressing the heating roller 31 to transfer the transferred sheet 12 guided between the rollers 31 and 32 while transferring the sheet 12.
In the fixing unit 21 of the electrophotographic apparatus for fixing the transferred image, a pressure roller gear 39 is coaxial with the pressure roller 32.
And an intermediate gear 45 for transmitting the rotation from the gear train 36 to the pressure roller gear 39, and the intermediate gear 4
5 is provided with a guide member 42 for guiding the pressure roller 32 to the pressure position when rotation is transmitted from 5, and for guiding to the retreat position when rotation is not transmitted.
【０００６】また、請求項２に記載の発明は、以下の図
示実施例に示すとおり、請求項１に記載の発明におい
て、前記ガイド部材４２をレバー状とし、一支点４３を
中心として回動自在とする一方、それで前記加圧ロ−ラ
３２を回動自在に支持してなることを特徴とする。According to a second aspect of the present invention, as shown in the following illustrated embodiments, in the first aspect of the present invention, the guide member has a lever shape and is rotatable about a fulcrum 43. On the other hand, the pressure roller 32 is rotatably supported thereby.
【０００７】さらに、請求項３に記載の発明は、以下の
図示実施例に示すとおり、請求項２に記載の発明におい
て、前記加圧ロ−ラ３２を前記加圧位置にしたとき、他
部材に突き当てて前記加熱ロ−ラ３１に対する前記加圧
ロ−ラ３２の一定以上の押し当てを規制する突当部４２
ａを、前記ガイド部材４２に設けてなることを特徴とす
る。Further, according to a third aspect of the present invention, as shown in the following illustrated embodiment, when the pressure roller 32 is set to the pressure position in the second aspect of the invention, another member is provided. Abutting portions 42 that regulate the pressing of the pressure roller 32 against the heating roller 31 by a certain amount or more.
a is provided on the guide member 42.
【０００８】[0008]
【作用】そして、請求項１に記載の発明では、作動して
いないとき、即ち駆動源からの回転が中間歯車４５から
加圧ロ−ラ歯車３９に伝達されていないとき、加圧ロ−
ラ３２を回転駆動せず、この加圧ロ−ラ３２を加熱ロ−
ラ３１に対して退避位置へとガイド部材４２で案内す
る。一方、作動しているとき、即ち駆動源からの回転が
中間歯車４５から加圧ロ−ラ歯車３９に伝達されている
とき、加圧ロ−ラ３２を回転駆動するとともに、この加
圧ロ−ラ３２をガイド部材４２で加圧位置へと案内して
加熱ロ−ラ３１に押し当てる。According to the first aspect of the present invention, when the motor is not operating, that is, when the rotation from the drive source is not transmitted from the intermediate gear 45 to the pressure roller gear 39, the pressure roller is not driven.
The pressing roller 32 is heated without rotating the roller 32.
The guide member 42 guides the roller 31 to the retracted position. On the other hand, when operating, that is, when the rotation from the drive source is transmitted from the intermediate gear 45 to the pressure roller gear 39, the pressure roller 32 is driven to rotate, and the pressure roller 32 is rotated. The roller 32 is guided to the pressing position by the guide member 42 and pressed against the heating roller 31.
【０００９】また、請求項２に記載の発明では、駆動源
からの回転が中間歯車４５から加圧ロ−ラ歯車３９に伝
達されていないとき、加圧ロ−ラ３２を回転駆動せず、
レバー状のガイド部材４２でこの加圧ロ−ラ３２を加熱
ロ−ラ３１に対して退避位置へと案内する。一方、駆動
源からの回転が中間歯車４５から加圧ロ−ラ歯車３９に
伝達されているとき、加圧ロ−ラ３２を回転駆動すると
ともにレバー状のガイド部材４２を回動してこの加圧ロ
−ラ３２を加圧位置へと案内し加熱ロ−ラ３１に押し当
てる。According to the second aspect of the present invention, when the rotation from the drive source is not transmitted from the intermediate gear 45 to the pressure roller gear 39, the pressure roller 32 is not driven to rotate.
The pressure roller 32 is guided to the retracted position with respect to the heating roller 31 by a lever-shaped guide member 42. On the other hand, when the rotation from the drive source is transmitted from the intermediate gear 45 to the pressure roller gear 39, the pressure roller 32 is rotationally driven and the lever-shaped guide member 42 is rotated to rotate the pressure roller 32. The pressure roller 32 is guided to the pressing position and pressed against the heating roller 31.
【００１０】さらに、請求項３に記載の発明では、加圧
ロ−ラ３２を加圧位置としたときガイド部材４２の突当
部４２ａを他部材に突き当てる。そして、加熱ロ−ラ３
１と加圧ロ−ラ３２との圧接部分のニップ巾を常に一定
とする。Further, according to the third aspect of the present invention, when the pressing roller 32 is set at the pressing position, the abutting portion 42a of the guide member 42 abuts against another member. And a heating roller 3
The nip width at the pressure contact portion between the pressure roller 1 and the pressure roller 32 is always constant.
【００１１】[0011]
【実施例】以下、図面を参照しつつ、この発明の一実施
例につき説明する。An embodiment of the present invention will be described below with reference to the drawings.
【００１２】図３は、この発明の一実施例である定着器
を備えるレーザプリンタで、その内部機構の全体概略構
成を示す。図中符号１０は、プリンタ本体である。プリ
ンタ本体１０の図中右側には、給紙トレイ１１を着脱自
在に取り付ける。給紙トレイ１１内には、用紙・封筒等
のシート１２を積載して収納する。そして、最上位のシ
ート１２の先端を給紙ローラ１３に押し当てる。しかし
て、この給紙ロ−ラ１３でシート１２を図中矢印Ａ方向
に送り出し、ガイド板１４で案内して先端を一対のレジ
ストロ−ラ１５・１５間に押し当てて止める。そして、
ドラム状の感光体１６の回転に合わせてそれらのレジス
トローラ１５・１５を駆動し、所定のタイミングでその
感光体１６に向けて送り出す。FIG. 3 shows a laser printer having a fixing device according to an embodiment of the present invention, and shows an overall schematic configuration of an internal mechanism thereof. Reference numeral 10 in the drawing denotes a printer main body. A paper feed tray 11 is detachably attached to the right side of the printer body 10 in the drawing. In the paper feed tray 11, sheets 12 such as paper and envelopes are stacked and stored. Then, the leading end of the uppermost sheet 12 is pressed against the sheet feeding roller 13. Then, the sheet 12 is fed by the sheet feed roller 13 in the direction of arrow A in FIG. And
The registration rollers 15 are driven in accordance with the rotation of the drum-shaped photoconductor 16 and are sent out toward the photoconductor 16 at a predetermined timing.
【００１３】前記感光体１６は、図示省略する駆動手段
によって駆動し、図中時計方向に回転する。その際帯電
チャ−ジャ１７によって表面を一様に帯電し、次いでそ
の表面にレーザ書込み器１８からのレ−ザ光を照射し、
そこに静電潜像を形成する。しかる後、現像器１９位置
を通るとき、この現像器１９でトナ−を付着してその静
電潜像を可視像化する。可視像（トナー画像）は、上記
のとおり所定のタイミングで感光体１６へと送り出した
シート１２に、転写チャ−ジャ２０によって転写する。
可視像を転写したシート１２は、この発明による定着器
２１へと搬送してそこで熱と圧力を加えて定着する。そ
の後、用紙搬送路２２を通し矢印Ｂ方向に排出して排紙
部２３にスタックする。The photoreceptor 16 is driven by driving means (not shown) and rotates clockwise in the drawing. At that time, the surface is uniformly charged by the charging charger 17, and then the surface is irradiated with laser light from a laser writer 18,
An electrostatic latent image is formed there. Thereafter, when the toner passes the position of the developing device 19, toner is adhered by the developing device 19 to visualize the electrostatic latent image. The visible image (toner image) is transferred by the transfer charger 20 to the sheet 12 sent to the photoconductor 16 at a predetermined timing as described above.
The sheet 12 to which the visible image has been transferred is conveyed to the fixing device 21 according to the present invention, where it is fixed by applying heat and pressure. Thereafter, the sheet is discharged in the direction of arrow B through the sheet conveying path 22 and stacked on the sheet discharge section 23.
【００１４】他方、可視像転写後の感光体１６は、クリ
−ニング器２４で残留トナ−を除去し、その後除電ブラ
シ２５で除電する。On the other hand, the photosensitive member 16 after the transfer of the visible image is cleaned by a cleaning device 24 to remove the remaining toner, and then discharged by a discharging brush 25.
【００１５】ところで、この発明による定着器２１は、
詳しくは図１及び図２に示すとおり、ケース３０内に収
納して加熱ローラ３１と加圧ローラ３２とを備える。By the way, the fixing device 21 according to the present invention comprises:
Specifically, as shown in FIGS. 1 and 2, a heating roller 31 and a pressure roller 32 are housed in a case 30.
【００１６】前記加熱ローラ３１は、中心に図示しない
ハロゲンランプ等の熱源を有し、一端部に加熱ロ−ラ歯
車３３を設ける。そして、加熱ロ−ラ軸３４を軸受３５
を介してケース３０の側壁３０ａに取り付ける。前記加
熱ロ−ラ歯車３３には、駆動源からの回転を伝える歯車
列３６の最終歯車３６ａを噛み合わせる。前記加熱ロ−
ラ３１を挾んで歯車列３６のある側と反対の側には、シ
ート分離爪３７を設ける。そして、そのシート分離爪３
７は、図示省略する付勢ばねで図中反時計方向に付勢し
てなり、前記加熱ローラ３１の外周に接触する。The heating roller 31 has a heat source such as a halogen lamp (not shown) at the center, and a heating roller gear 33 is provided at one end. The heating roller shaft 34 is connected to a bearing 35.
Is attached to the side wall 30a of the case 30 via A final gear 36a of a gear train 36 for transmitting rotation from a drive source is meshed with the heating roller gear 33. The heating ro
A sheet separating claw 37 is provided on the side opposite to the side where the gear train 36 is located across the roller 31. And the sheet separation claw 3
Reference numeral 7 denotes an urging spring (not shown) which is urged in a counterclockwise direction in the drawing to come into contact with the outer periphery of the heating roller 31.
【００１７】前記加圧ローラ３２は、たとえばシリコン
ゴムで形成し、両端部に加圧ロ−ラ歯車３９を設ける。
そして、加圧ロ−ラ軸４０を軸受４１を介してガイド部
材４２に取り付ける。そのガイド部材４２は、レバー状
とし、前記ケース３０の側壁３０ａに一支点４３を中心
として回動自在に設ける。そして、前記加圧ロ−ラ歯車
３９に後記する中間歯車から回転が伝達されていないと
き、図示しないストッパに当たって前記加圧ロ−ラ３２
を前記加熱ロ−ラ３１から離れた退避位置に支持する。
また、このガイド部材４２の外周には、前記加熱ロ−ラ
３１の軸受３５に突き当てる突当部４２ａを設ける。The pressure roller 32 is made of, for example, silicone rubber, and has pressure roller gears 39 at both ends.
Then, the pressure roller shaft 40 is attached to the guide member 42 via the bearing 41. The guide member 42 has a lever shape, and is provided on the side wall 30 a of the case 30 so as to be rotatable around a fulcrum 43. When rotation is not transmitted to the pressure roller gear 39 from an intermediate gear described later, the pressure roller gear 39 hits a stopper (not shown) and presses the pressure roller 32.
At a retracted position away from the heating roller 31.
Further, on the outer periphery of the guide member 42, an abutting portion 42a which abuts on the bearing 35 of the heating roller 31 is provided.
【００１８】前記加圧ロ−ラ３２を挾んで前記ガイド部
材４２の一支点４３のある側と反対の側には、中間歯車
４５を配置する。その中間歯車４５は、その歯車軸４５
ａを軸受４６を介して前記ケース３０の側板３０ａに取
り付け、前記加圧ロ−ラ歯車３９及び前記歯車列３６の
最終歯車３６ａにそれぞれ噛み合わせる。なお、この発
明による定着器２１では、さらに入口側に入口ガイド４
７を備え、出口側に出口ガイド４８および排出ローラ対
４９を備える。An intermediate gear 45 is disposed on the side opposite to the side of the fulcrum 43 of the guide member 42 across the pressure roller 32. The intermediate gear 45 has a gear shaft 45
a is attached to the side plate 30a of the case 30 via a bearing 46, and meshes with the pressure roller gear 39 and the final gear 36a of the gear train 36, respectively. In the fixing device 21 according to the present invention, the entrance guide 4 is further provided on the entrance side.
7 and an outlet guide 48 and a discharge roller pair 49 on the outlet side.
【００１９】しかして、プリンタ本体１０の駆動時、駆
動源からの回転が前記歯車列３６から前記加熱ロ−ラ歯
車３３に伝達されると、その加熱ロ−ラ歯車３３が回転
して前記加熱ロ−ラ３１を回転駆動し、同時に前記中間
歯車４５を介して前記加圧ロ−ラ歯車３９が回転し加圧
ロ−ラ３２を回転駆動する。そして、前記加圧ロ−ラ歯
車３９が回転駆動するとき、前記ガイド部材４２が一支
点４３を中心として図中反時計方向に回動し加圧ロ−ラ
３２を加圧位置へと案内して前記加熱ロ−ラ３１に押し
当てる。そして、この加圧ロ−ラ３２が加圧位置にある
とき、前記ガイド部材４２の突当部４２ａを前記加熱ロ
−ラ３１の軸受部３５に突き当てて加熱ロ−ラ３１に対
する一定以上の押し当てを規制する。そうして、転写後
のシート１２を入口ガイド４７で案内してこの発明によ
る定着器２１内に導き、加熱ローラ３１と加圧ローラ３
２とで挾んで搬送しながら熱と圧力とを加えてそのシー
ト１２上の転写画像を定着する。定着後、シート１２
は、シート分離爪３７で加熱ローラ３１から分離して出
口ガイド４８で案内し、排出ローラ対４９で送り出して
この発明による定着器２１から排出する。When the rotation of the drive source is transmitted from the gear train 36 to the heating roller gear 33 when the printer main body 10 is driven, the heating roller gear 33 rotates and the heating roller gear 33 rotates. The roller 31 is driven to rotate, and at the same time, the pressure roller gear 39 is rotated via the intermediate gear 45, and the pressure roller 32 is driven to rotate. When the pressure roller gear 39 is driven to rotate, the guide member 42 rotates counterclockwise about the fulcrum 43 in the figure to guide the pressure roller 32 to the pressure position. To the heating roller 31. When the pressure roller 32 is at the pressure position, the abutting portion 42a of the guide member 42 abuts against the bearing portion 35 of the heating roller 31 so that the pressing roller 32 is at least a certain amount with respect to the heating roller 31. Regulate pushing. Then, the sheet 12 after the transfer is guided by the entrance guide 47 into the fixing device 21 according to the present invention, and the heating roller 31 and the pressure roller 3
Heat and pressure are applied to the sheet 12 while the sheet 12 is conveyed, and the transferred image on the sheet 12 is fixed. After fixing, sheet 12
Is separated from the heating roller 31 by the sheet separating claw 37, guided by the outlet guide 48, sent out by the discharge roller pair 49, and discharged from the fixing device 21 according to the present invention.
【００２０】一方、プリンタ本体１０の駆動を停止する
と、前記加圧ロ−ラ３２及びガイド部材４２自体の重力
で前記ガイド部材４２が時計方向に回動してこの加圧ロ
−ラ３２を再び前記加熱ロ−ラ３１から離れた退避位置
へと案内する。On the other hand, when the driving of the printer main body 10 is stopped, the guide member 42 is rotated clockwise by the gravity of the pressure roller 32 and the guide member 42 itself, and the pressure roller 32 is again rotated. It is guided to a retracted position away from the heating roller 31.
【００２１】なお、上述した図示実施例では、ガイド部
材４２を一支点４３を中心として回動自在のレバー状と
し、それで案内して加圧ロ−ラ３２を加熱ロ−ラ３１に
押し当てる構成とした。しかし、この発明では、図示省
略したがたとえば平板状のガイド部材に軸受溝を設け、
その軸受溝で加圧ロ−ラの軸受を上下動自在に案内して
加圧ロ−ラを加熱ロ−ラに押し当てる構成としてもよ
い。In the illustrated embodiment described above, the guide member 42 is formed in a lever shape which is rotatable about one fulcrum 43, and is guided by the guide member 42 to press the pressure roller 32 against the heating roller 31. And However, in the present invention, although not shown, for example, a bearing groove is provided in a flat guide member,
The bearing of the pressure roller may be guided up and down freely in the bearing groove so that the pressure roller is pressed against the heating roller.
【００２２】また、上述した図示実施例では、加圧ロ−
ラ３２を加圧位置としたとき、前記ガイド部材４２の突
当部４２ａを前記加熱ロ−ラ３１の軸受部３５に突き当
ててこの加圧ロ−ラ３２の加熱ロ−ラ３１に対する一定
以上の押し当てを規制する構成とした。しかし、この発
明では、加熱ロ−ラ３１の軸受部３５以外の適宜他部材
に突き当ててこの加圧ロ−ラ３２の加熱ロ−ラ３１に対
する一定以上の押し当てを規制する構成としてもよい。In the illustrated embodiment described above, the pressure roller
When the roller 32 is in the pressing position, the abutting portion 42a of the guide member 42 abuts against the bearing portion 35 of the heating roller 31 so that the pressing roller 32 is at least a certain amount with respect to the heating roller 31. The pressure is restricted. However, in the present invention, a configuration may be adopted in which the pressing roller 32 is pressed against the heating roller 31 by a certain amount or more by abutting against another member other than the bearing portion 35 of the heating roller 31. .
【００２３】[0023]
【発明の効果】以上のことから、この発明では、加熱ロ
−ラへの回転伝達に合わせてその加熱ロ−ラに対して加
圧ロ−ラを接離するから、加圧ロ−ラを付勢する付勢バ
ネ及びその付勢を解除する付勢解除機構が不要となる。
よって、付勢バネの付勢力のバラツキや加圧アームと加
圧ロ−ラ間の摩擦力の差により定着状態が不均一になる
ことを防止できる。また、構造を簡単にしてコストダウ
ンを図ることができるし、ジャム処理の操作性を良くす
ることができる。As described above, according to the present invention, the pressure roller is brought into contact with and separated from the heating roller in accordance with the rotation transmitted to the heating roller. There is no need for an urging spring and an urging release mechanism for releasing the urging.
Therefore, it is possible to prevent the fixing state from becoming non-uniform due to the variation in the urging force of the urging spring and the difference in the frictional force between the pressure arm and the pressure roller. In addition, the structure can be simplified, cost can be reduced, and operability of jam processing can be improved.
【００２４】また、請求項３に記載の発明では、加圧ロ
−ラを加圧位置としたとき加熱ロ−ラと加圧ロ−ラとの
圧接部分のニップ巾が常に一定となるので、定着状態が
安定する。According to the third aspect of the present invention, when the pressure roller is set to the pressure position, the nip width of the pressure contact portion between the heating roller and the pressure roller is always constant. The fixing state is stabilized.
【図１】この発明の一実施例である定着器の概略構成図
である。FIG. 1 is a schematic configuration diagram of a fixing device according to an embodiment of the present invention.
【図２】その定着器のＡ−Ａ線の断面図である。FIG. 2 is a sectional view taken along line AA of the fixing device.
【図３】その定着器を備えるレーザプリンタの内部機構
全体の概略構成図である。FIG. 3 is a schematic configuration diagram of an entire internal mechanism of a laser printer including the fixing device.
【図４】従来の定着器の概略構成図である。FIG. 4 is a schematic configuration diagram of a conventional fixing device.
１２ シート ２１ 定着器 ３１ 加熱ロ−ラ ３２ 加圧ロ−ラ ３６ 歯車列 ３９ 加圧ロ−ラ歯車 ４２ ガイド部材 ４２ａ 突当部 ４５ 中間歯車 DESCRIPTION OF SYMBOLS 12 Sheet 21 Fixing device 31 Heating roller 32 Pressure roller 36 Gear train 39 Pressure roller gear 42 Guide member 42a Abutment part 45 Intermediate gear
Claims (3)
ロ−ラに伝達し、その加熱ロ−ラをそれに押し当てる加
圧ロ−ラとともに回転し、それらのロ−ラ間に導いた転
写後のシートを搬送しながらそのシート上の転写画像を
定着する電子写真装置の定着器において、前記加圧ロ−
ラと同軸に加圧ロ−ラ歯車を設け、その加圧ロ−ラ歯車
に前記歯車列からの回転を伝達する中間歯車を設け、そ
の中間歯車から回転が伝達されているとき前記加圧ロ−
ラを加圧位置に案内し、伝達されていないとき退避位置
に案内するガイド部材を設けてなる、電子写真装置の定
着器。A rotation from a driving source is transmitted to a heating roller via a gear train, and the heating roller rotates together with a pressure roller pressing against the heating roller, and is guided between the rollers. A fixing unit of an electrophotographic apparatus for fixing a transferred image on the transferred sheet while conveying the transferred sheet.
A pressure roller gear is provided coaxially with the gear, an intermediate gear for transmitting rotation from the gear train is provided on the pressure roller gear, and the pressure roller is provided when rotation is transmitted from the intermediate gear. −
A fixing device for an electrophotographic apparatus, comprising a guide member for guiding a roller to a pressing position and guiding to a retracted position when the roller is not transmitted.
を中心として回動自在とする一方、それで前記加圧ロ−
ラを回動自在に支持してなる、請求項１に記載の電子写
真装置の定着器。2. The guide member is formed in a lever shape and is rotatable around one fulcrum.
The fixing device of the electrophotographic apparatus according to claim 1, wherein the roller is rotatably supported.
き、他部材に突き当てて前記加熱ロ−ラに対する前記加
圧ロ−ラの一定以上の押し当てを規制する突当部を、前
記ガイド部材に設けてなる、請求項２に記載の電子写真
装置の定着器。3. When the pressure roller is set at the pressure position, the pressure roller abuts against another member to regulate pressing of the pressure roller against the heating roller by a certain amount or more. The fixing device of the electrophotographic apparatus according to claim 2, wherein the fixing device is provided on the guide member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3078471A JP2977928B2 (en) | 1991-03-18 | 1991-03-18 | Electrophotographic device fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3078471A JP2977928B2 (en) | 1991-03-18 | 1991-03-18 | Electrophotographic device fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0594110A JPH0594110A (en) | 1993-04-16 |
| JP2977928B2 true JP2977928B2 (en) | 1999-11-15 |
Family
ID=13662932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3078471A Expired - Fee Related JP2977928B2 (en) | 1991-03-18 | 1991-03-18 | Electrophotographic device fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2977928B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009058622A (en) | 2007-08-30 | 2009-03-19 | Brother Ind Ltd | Image forming apparatus |
-
1991
- 1991-03-18 JP JP3078471A patent/JP2977928B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0594110A (en) | 1993-04-16 |
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