JPH05119663A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH05119663A JPH05119663A JP28487191A JP28487191A JPH05119663A JP H05119663 A JPH05119663 A JP H05119663A JP 28487191 A JP28487191 A JP 28487191A JP 28487191 A JP28487191 A JP 28487191A JP H05119663 A JPH05119663 A JP H05119663A
- Authority
- JP
- Japan
- Prior art keywords
- roller
- load
- fixing
- lever
- pressure contact
- 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電子写真複写機等の画
像形成装置に使用される熱ローラ方式の定着装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat roller type fixing device used in an image forming apparatus such as an electrophotographic copying machine.
【０００２】[0002]
【従来の技術】熱ローラ方式の定着装置においては、ト
ナー像を転写した転写材は定着ローラと加圧ローラとの
挟着により搬送されつつ高温状態に加熱されるので、そ
の圧着力すなわち定着ローラに対する加圧ローラの圧接
荷重が定着後の転写材の状態に微妙に影響するとされて
いる。一般的な普通紙を定着するに適した圧接荷重をも
って例えば封筒のような袋状の特殊な転写材を定着する
とシワや折れ目を生じて転写材の品位を著しく損うおそ
れがある。2. Description of the Related Art In a heat roller type fixing device, a transfer material on which a toner image is transferred is heated to a high temperature while being conveyed by being sandwiched between a fixing roller and a pressure roller. It is said that the pressure contact load of the pressure roller with respect to is subtly affecting the state of the transfer material after fixing. If a bag-shaped special transfer material such as an envelope is fixed with a pressure contact load suitable for fixing general plain paper, wrinkles or creases may occur, and the quality of the transfer material may be significantly impaired.
【０００３】そのため転写材を常に良好な状態に定着す
る目的で、転写材の種類や形態等に応じて加圧ローラの
圧接荷重を適度の荷重に切換える機構が設けられてい
る。Therefore, for the purpose of always fixing the transfer material in a good condition, a mechanism for switching the pressure contact load of the pressure roller to an appropriate load is provided according to the type and form of the transfer material.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら従来用い
られている加圧ローラの圧接荷重の切換え機構はソレノ
イドやステッピングモータ等高価な機材を必要としてい
て普及機に適用することが出来ず、また圧接状態を完全
に解除すること迄は出来ないためにジャム処理に不都合
であると云う欠点があった。However, the pressure contact load switching mechanism of the pressure roller which has been conventionally used cannot be applied to a widespread machine because it requires expensive equipment such as a solenoid and a stepping motor, and the pressure contact state cannot be applied. However, there is a drawback that it is inconvenient for the jam processing because it cannot be completely canceled.
【０００５】本発明はこの点を解決して改良した結果、
高価な機材を使用せず極めて簡単な機構により加圧ロー
ラの圧接荷重の切換えと解除を可能とした定着装置の提
供を目的としたものである。As a result of solving and improving this point, the present invention provides
It is an object of the present invention to provide a fixing device capable of switching and releasing the pressure contact load of a pressure roller with an extremely simple mechanism without using expensive equipment.
【０００６】[0006]
【課題を解決するための手段】上記目的は、定着ローラ
と該定着ローラに圧接する加圧ローラとから構成される
熱ローラ方式の定着装置において、前記加圧ローラの前
記定着ローラに対する圧接荷重を取手の操作により高低
２段階および解除状態に切換えることを特徴とする定着
装置によって達成される。SUMMARY OF THE INVENTION The above object is to provide a heat roller type fixing device comprising a fixing roller and a pressure roller which is in pressure contact with the fixing roller. This is achieved by a fixing device characterized by switching between high and low stages and a released state by operating a handle.
【０００７】[0007]
【実施例】本発明による定着装置の一実施例を図１ない
し図４に示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fixing device according to the present invention is shown in FIGS.
【０００８】図１は前記定着装置の断面構成を、また図
２はその要部の平面構成を示したものである。FIG. 1 shows a sectional structure of the fixing device, and FIG. 2 shows a plan structure of a main part thereof.
【０００９】１は定位置において回動自在に軸受支持さ
れる定着ローラで、その周面は弾性体の耐熱ゴムによっ
て形成されている。A fixing roller 1 is rotatably supported by a bearing at a fixed position, and its peripheral surface is formed of an elastic heat-resistant rubber.
【００１０】２はヒータＨを内蔵し、同軸上の歯車Ｇ１
に噛合する駆動歯車Ｇ２の作動により反時計方向に回転
される金属製の加圧ローラである。Numeral 2 has a built-in heater H and has a coaxial gear G1.
It is a metal pressure roller that is rotated counterclockwise by the operation of the drive gear G2 that meshes with.
【００１１】３はフランジ３Ａを備える一対の軸受部材
であって、前記加圧ローラ２をその両軸端部に嵌合して
支持している。Reference numeral 3 denotes a pair of bearing members provided with a flange 3A, which fits and supports the pressure roller 2 on both shaft ends thereof.
【００１２】４は回転軸４Ａを支点として回動する円弧
状の一対の圧接レバーで、比較的弱い引張ばね５によっ
てそれぞれ時計方向へ付勢されて前記軸受部材３を押圧
し、それによって加圧ローラ２の周面を定着ローラ１の
周面に対し均等に圧接されている。Reference numeral 4 denotes a pair of arc-shaped pressure contact levers which rotate about a rotary shaft 4A as a fulcrum. The pressure contact levers 4 are urged clockwise by relatively weak tension springs 5 to press the bearing member 3, thereby applying pressure. The peripheral surface of the roller 2 is evenly pressed against the peripheral surface of the fixing roller 1.
【００１３】６は回転軸６Ａを支点として回動する一対
の揺動レバーであって、比較的強い引張ばね７によって
それぞれ反時計方向へと付勢されている。Reference numeral 6 denotes a pair of rocking levers which rotate about a rotary shaft 6A as a fulcrum, and are biased counterclockwise by relatively strong tension springs 7.
【００１４】前記揺動レバー６はその一方の端部に圧接
ピン６Ｂを備えていて、該圧接ピン６Ｂが挿通する前記
圧接レバー４の係合穴４Ｂの上縁を押圧することによっ
て圧接レバー４を前記引張ばね５の付勢に加えてさらに
強く時計方向へと付勢している。The rocking lever 6 is provided with a pressure contact pin 6B at one end thereof, and the pressure contact lever 4 is pushed by pressing the upper edge of the engagement hole 4B of the pressure contact lever 4 through which the pressure contact pin 6B is inserted. In addition to the urging force of the tension spring 5, the urging force is further strongly urged in the clockwise direction.
【００１５】８は定着装置を貫通する駆動軸９上に角度
の位相を同じくして固定された一対のカム部材であって
２つの突起８Ａと８Ｂを形成していて装置外部に突出し
た取手10を操作することによって回動される。Numeral 8 is a pair of cam members fixed on the drive shaft 9 penetrating the fixing device at the same angle phase, forming two projections 8A and 8B, and a handle 10 protruding outside the device. It is rotated by operating.
【００１６】前記駆動軸９の回動角度すなわち前記カム
部材８の回動位置は、フォトセンサＰＳが駆動軸９上に
設けた遮光板９Ａにより遮光されてＯＦＦに切換えられ
ることによって検知される。The rotation angle of the drive shaft 9, that is, the rotation position of the cam member 8 is detected when the photosensor PS is shielded from light by a light shielding plate 9A provided on the drive shaft 9 and turned off.
【００１７】前記定着ローラ１に対する加圧ローラ２の
圧接荷重の切換えは次に記すようにして行われる。The pressure contact load of the pressure roller 2 with respect to the fixing roller 1 is switched in the following manner.
【００１８】定着装置は画像形成装置本体の電源スイッ
チの操作により作動状態とされ、定着ローラ１および加
圧ローラ２の各周面温度はそれぞれ温度センサＴＳ１お
よびＴＳ２によって検出されて所定の温度に制御され、
一方加圧ローラ２ならびにそれに従動する定着ローラ１
の回転速度もまた規定の搬送速度に保たれている。The fixing device is activated by operating the power switch of the image forming apparatus main body, and the peripheral surface temperatures of the fixing roller 1 and the pressure roller 2 are detected by temperature sensors TS1 and TS2, respectively, and are controlled to a predetermined temperature. Was
On the other hand, the pressure roller 2 and the fixing roller 1 which follows the pressure roller 2
The rotation speed of is also maintained at the specified transport speed.
【００１９】定着される転写材が一般的な普通紙である
場合、前記カム部材８は取手10の操作によって図１に示
す如くストッパＰ１に当接した角度に回動されて前記揺
動レバー６により離間した位置に保たれる。When the transfer material to be fixed is ordinary plain paper, the cam member 8 is rotated by the operation of the handle 10 to the angle at which it abuts against the stopper P1 as shown in FIG. Are kept in a separated position by.
【００２０】従って、前記圧接レバー４は前述した如く
引張ばね５と引張ばね７の双方によって同時に時計方向
に付勢される状態に置かれその結果定着ローラ１と加圧
ローラ２は普通紙の定着条件に適した強力な圧接荷重
（第１荷重とする）をもって転写材を挟着し、搬送する
これに対し転写される転写材が封筒のような特殊紙であ
る場合、前記カム部材８は取手10の操作により時計方向
に回動されて図２に示す如く突起８Ａおよび８Ｂをもっ
て前記揺動レバー６を引張ばね７の付勢に抗して僅かに
時計方向に回動した位置に保持する。Therefore, the pressing lever 4 is placed in a state in which it is simultaneously urged in the clockwise direction by both the tension spring 5 and the tension spring 7 as described above, so that the fixing roller 1 and the pressure roller 2 fix the plain paper. When the transfer material is sandwiched by a strong pressure contact load (referred to as a first load) suitable for the conditions, and the transfer material to be transferred is special paper such as an envelope, the cam member 8 is a handle. It is rotated clockwise by the operation of 10 and holds the swing lever 6 at a position which is slightly rotated clockwise against the bias of the tension spring 7 by the projections 8A and 8B as shown in FIG.
【００２１】従って前記圧接ピン６Ｂは前記係合穴４Ｂ
の上縁より離れて係合穴４Ｂの中央の位置を占め、その
結果前記圧接レバー４は引張ばね５のみの作用によって
時計方向に付勢されて定着ローラ１と加圧ローラ２は封
筒のような特殊紙の定着条件に適したやや軽度の圧接荷
重（第２荷重とする）をもって転写材を挟着し、搬送す
る。Therefore, the pressure contact pin 6B is connected to the engagement hole 4B.
Occupies the central position of the engaging hole 4B apart from the upper edge, and as a result, the pressure contact lever 4 is urged in the clockwise direction by the action of the tension spring 5 only, and the fixing roller 1 and the pressure roller 2 act as an envelope. The transfer material is sandwiched and conveyed with a slightly lighter pressure contact load (referred to as a second load) suitable for fixing conditions of special paper.
【００２２】前述した第２荷重への切換え作動は前記フ
ォトセンサＰＳの遮光板９Ａの検出信号によって画像形
成装置の操作盤上にランプ等の点灯として表示される。The above-described operation of switching to the second load is displayed as a lighting of a lamp or the like on the operation panel of the image forming apparatus according to the detection signal of the light shielding plate 9A of the photosensor PS.
【００２３】定着を終えた転写材は搬送ガイド11を経て
排紙ローラ12により排紙され除電ブラシ13により除電さ
れたのち装置の外部に排出される。一方定着ローラ１は
周面に付着したトナーをクリーニングローラ14により清
掃され、さらにオイル供給装置15においてシリコンオイ
ルを塗布されて転写材上のトナーの転移、密着の防止に
備える。The transfer material, which has been fixed, is discharged through the conveying guide 11 by the discharging roller 12 and discharged by the discharging brush 13 and then discharged outside the apparatus. On the other hand, the fixing roller 1 is cleaned by the cleaning roller 14 to remove the toner adhering to the peripheral surface thereof, and is coated with silicone oil in the oil supply device 15 to prevent the transfer and adhesion of the toner on the transfer material.
【００２４】また転写材が搬送トラブルによりジャム状
態になった場合には、前記取手10をさらに操作して図４
に示す如く突起８Ｂが揺動レバー６をストッパＰ２に当
接する迄前記カム部材８を回動すると、揺動レバー６の
圧接ピン６Ｂが圧接レバー４の係合穴４Ｂの下線を引張
ばね５および７の付勢に抗して押圧する結果、圧接レバ
ー４は反時計方向に回動して加圧ローラ２を下方に退避
させ定着ローラ１の周面との間に間隙Ｃを形成する。Further, when the transfer material is jammed due to a conveyance trouble, the handle 10 is further operated, and the handle shown in FIG.
When the cam member 8 is rotated until the protrusion 8B abuts the swing lever 6 on the stopper P2 as shown in FIG. As a result of pressing against the urging force of the pressure roller 7, the pressure contact lever 4 rotates counterclockwise to retract the pressure roller 2 downward and form a gap C between the pressure roller 2 and the peripheral surface of the fixing roller 1.
【００２５】従ってジャム紙は容易に定着装置内より除
去されて定着作動を速やかに再開し継続することが出来
る。Therefore, the jammed paper can be easily removed from the fixing device, and the fixing operation can be rapidly restarted and continued.
【００２６】[0026]
【発明の効果】本発明により、一般の普通紙から封筒の
ような特殊紙に至る迄の各種の転写材に対してそれぞれ
の定着条件にて適った定着処理を行うことの出来る極め
て利用範囲の広い定着装置が提供されることとなった。According to the present invention, it is possible to carry out a fixing process suitable for various transfer materials from ordinary plain paper to special paper such as envelopes under respective fixing conditions. A wide fixing device is provided.
【図１】本発明の定着装置の構成を示す断面図である。FIG. 1 is a cross-sectional view showing a configuration of a fixing device of the present invention.
【図２】前記装置の要部を示す平面図である。FIG. 2 is a plan view showing a main part of the apparatus.
【図３】前記装置の要部図である。FIG. 3 is a main part view of the device.
【図４】前記装置の要部図である。FIG. 4 is a main part view of the device.
１ 定着ローラ ２ 加圧ローラ ３ 軸受部材 ４ 圧接レバー ４Ｂ 係合穴 ５、７ 引張ばね ６ 揺動レバー ６Ｂ 圧接ピン ８ カム部材 ９ 駆動軸 10 取手 Ｈ ヒータ ＴＳ１、ＴＳ２ 温度センサ ＰＳ フォトセンサ 1 Fixing Roller 2 Pressure Roller 3 Bearing Member 4 Pressure Contact Lever 4B Engagement Hole 5,7 Tension Spring 6 Swing Lever 6B Pressure Contact Pin 8 Cam Member 9 Drive Shaft 10 Handle H Heater TS1, TS2 Temperature Sensor PS Photo Sensor
Claims (1)
圧ローラとから構成される熱ローラ方式の定着装置にお
いて、前記加圧ローラの前記定着ローラに対する圧接荷
重を取手の操作により高低２段階および解除状態に切換
えることを特徴とする定着装置。1. A heat roller type fixing device comprising a fixing roller and a pressure roller which is in pressure contact with the fixing roller, wherein the pressure contact load of the pressure roller with respect to the fixing roller is set in two stages of high and low by operating a handle. A fixing device characterized by being switched to a released state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28487191A JPH05119663A (en) | 1991-10-30 | 1991-10-30 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28487191A JPH05119663A (en) | 1991-10-30 | 1991-10-30 | Fixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05119663A true JPH05119663A (en) | 1993-05-18 |
Family
ID=17684118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28487191A Pending JPH05119663A (en) | 1991-10-30 | 1991-10-30 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05119663A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015069088A (en) * | 2013-09-30 | 2015-04-13 | シャープ株式会社 | Fixing device and image forming apparatus |
-
1991
- 1991-10-30 JP JP28487191A patent/JPH05119663A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015069088A (en) * | 2013-09-30 | 2015-04-13 | シャープ株式会社 | Fixing device and image forming apparatus |
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