JPH06124050A - Fixing device - Google Patents
Fixing deviceInfo
- Publication number
- JPH06124050A JPH06124050A JP30036692A JP30036692A JPH06124050A JP H06124050 A JPH06124050 A JP H06124050A JP 30036692 A JP30036692 A JP 30036692A JP 30036692 A JP30036692 A JP 30036692A JP H06124050 A JPH06124050 A JP H06124050A
- Authority
- JP
- Japan
- Prior art keywords
- fixing roller
- bearing
- temperature
- fixing
- 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.)
- Granted
Links
Landscapes
- Fixing For Electrophotography (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、レーザを用いた、プ
リンタ・複写機・ファクシミリなど、電子写真方式によ
りシートに記録を行う電子写真記録装置に適用しうる。
詳しくは、そのような電子写真記録装置において、定着
ロ−ラの温度が一定以上になったときその温度で軸受を
溶解し、前記定着ロ−ラを移動して温度ヒューズに近づ
け、その温度ヒューズを切断して前記定着ロ−ラのヒー
タへの通電を停止する定着装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be applied to an electrophotographic recording apparatus for recording on a sheet by an electrophotographic system such as a printer, a copying machine, a facsimile, etc. using a laser.
Specifically, in such an electrophotographic recording apparatus, when the temperature of the fixing roller exceeds a certain temperature, the bearing is melted at that temperature, and the fixing roller is moved to approach the temperature fuse, The present invention relates to a fixing device which cuts off the electric current and stops energizing the heater of the fixing roller.
【０００２】[0002]
【従来の技術】従来、たとえばレーザプリンタの定着装
置では、図８に示すように、ヒータ１を内蔵する定着ロ
−ラ２に付勢部材３で付勢して加圧ロ−ラ４を押し当
て、それら定着ロ−ラ２と加圧ロ−ラ４間に転写後のシ
ートＳを通し、それに熱と圧力とを加えてそのシートＳ
上の転写画像を定着する。2. Description of the Related Art Conventionally, in a fixing device of a laser printer, for example, as shown in FIG. 8, a fixing roller 2 having a heater 1 built therein is urged by an urging member 3 to press a pressure roller 4. The sheet S after transfer is passed between the fixing roller 2 and the pressure roller 4, and heat and pressure are applied to the sheet S to transfer the sheet S.
Fix the transfer image above.
【０００３】ところで、そのような定着装置では、図９
に示すように、軸受５を介して定着フレーム６で定着ロ
−ラ２を回転自在に支持する構成とし、該定着ロ−ラ２
の表面温度が一定以上になったときその温度で前記軸受
５を溶解し、前記付勢部材３で定着ロ−ラ２を移動して
温度ヒューズ７に近づけ、その温度ヒューズ７を切断し
て前記定着ロ−ラ２のヒータ１への通電を停止してい
た。By the way, in such a fixing device, as shown in FIG.
As shown in FIG. 3, the fixing roller 2 is rotatably supported by the fixing frame 6 via the bearing 5, and the fixing roller 2 is rotatably supported.
When the surface temperature of the above is above a certain temperature, the bearing 5 is melted at that temperature, and the fixing roller 2 is moved by the urging member 3 to bring it closer to the thermal fuse 7, and the thermal fuse 7 is cut to disconnect the thermal fuse 7. The energization of the heater 1 of the fixing roller 2 was stopped.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
定着装置では、定着ロ−ラ２の表面温度が一定以上にな
ったときその温度で軸受５の内径部を均一に溶解するの
で、温度ヒューズ７を切断して定着ロ−ラ２のヒータ１
への通電を停止するまでに時間がかかる問題があった。
そのため、定着ロ−ラ２の高熱で軸受５を溶解したり温
度ヒューズ７を切断したりするだけでなく、加圧ロ−ラ
４を変形したり、内部が発煙状態となったりすることが
あった。However, in the conventional fixing device, when the surface temperature of the fixing roller 2 becomes a certain temperature or more, the inner diameter of the bearing 5 is uniformly melted at that temperature. Cut off the heater 1 of the fixing roller 2
There was a problem that it took time to stop the power supply to the.
Therefore, not only the bearing 5 may be melted and the thermal fuse 7 may be cut by the high heat of the fixing roller 2, but also the pressure roller 4 may be deformed or the inside may be in a smoking state. It was
【０００５】そこで、定着ロ−ラ２の温度が一定以上に
なったとき定着ロ−ラ２のヒータ１への通電を速やかに
停止するために、従来の定着装置の中には、図１０に示
すように、サーモスタット８を支持するホルダ９を定着
ロ−ラ２に圧接し、該定着ロ−ラ２との接触部分９ａを
定着ロ−ラ２の表面の制御温度よりも若干高い温度で融
解する材料で形成する構成としたものがある。Therefore, in order to quickly stop the energization of the heater 1 of the fixing roller 2 when the temperature of the fixing roller 2 exceeds a certain temperature, some conventional fixing devices are shown in FIG. As shown, the holder 9 supporting the thermostat 8 is pressed against the fixing roller 2, and the contact portion 9a with the fixing roller 2 is melted at a temperature slightly higher than the control temperature of the surface of the fixing roller 2. There is a configuration in which the material is formed.
【０００６】そして、定着ロ−ラ２の表面温度が一定以
上になったとき、該定着ロ−ラ２との接触部分９ａが融
解または軟化してサーモスタット８を定着ロ−ラ２側へ
近づけ、該サーモスタット８でその温度を検知して定着
ロ−ラ２のヒータへの通電を停止していた。When the surface temperature of the fixing roller 2 exceeds a certain level, the contact portion 9a with the fixing roller 2 melts or softens to bring the thermostat 8 closer to the fixing roller 2 side, The temperature was detected by the thermostat 8 and the energization of the heater of the fixing roller 2 was stopped.
【０００７】しかし、上述した従来の定着装置では、サ
ーモスタットの支持構造が大掛かりでコストアップとな
る問題があった。However, the above-mentioned conventional fixing device has a problem that the supporting structure of the thermostat is large and the cost is increased.
【０００８】そこで、この発明の目的は、安価な構成に
より、定着ロ−ラの温度が一定以上になったとき該定着
ロ−ラのヒータへの通電を速やかに停止することにあ
る。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to quickly stop the energization of the heater of the fixing roller when the temperature of the fixing roller becomes a certain temperature or more by an inexpensive structure.
【０００９】[0009]
【課題を解決するための手段】そのため、請求項１に記
載のものは、例えば以下の図示実施例のように、軸受４
０を介して定着下フレーム３５のようなフレームで定着
ロ−ラ３７を回転自在に支持し、その定着ロ−ラ３７に
加圧ロ−ラ４３を押し当て、前記定着ロ−ラ３７の温度
が一定以上になったときその温度で軸受４０を溶解し、
前記定着ロ−ラ３７を移動して温度ヒューズ４２に近づ
け、その温度ヒューズ４２を切断して前記定着ロ−ラ３
７のヒータ４１への通電を停止する定着装置２５におい
て、前記軸受４０に形成した複数の突起４０ｂ・４０ｃ
・４０ｄまたは前記フレームに形成した複数の突起３５
ｂ・３５ｃ・３５ｄを介在して前記フレームで前記軸受
４０を保持してなることを特徴とする。Therefore, according to the first aspect of the present invention, the bearing 4 has a structure as shown in the following illustrated embodiment, for example.
The fixing roller 37 is rotatably supported by a frame such as the lower fixing frame 35 through 0, and the pressure roller 43 is pressed against the fixing roller 37 to determine the temperature of the fixing roller 37. When the temperature exceeds a certain level, the bearing 40 is melted at that temperature,
The fixing roller 37 is moved to approach the temperature fuse 42, and the temperature fuse 42 is cut to cut the fixing roller 3
In the fixing device 25 for stopping the power supply to the heater 41 of No. 7, the plurality of protrusions 40b and 40c formed on the bearing 40
40d or a plurality of protrusions 35 formed on the frame
The bearing 40 is held by the frame with b, 35c, and 35d interposed.
【００１０】請求項２に記載のものは、例えば以下の図
示実施例のように、軸受４０を介して定着下フレーム３
５のようなフレームで定着ロ−ラ３７を回転自在に支持
し、その定着ロ−ラ３７に加圧ロ−ラ４３を押し当て、
前記定着ロ−ラ３７の温度が一定以上になったときその
温度で軸受４０を溶解し、前記定着ロ−ラ３７を移動し
て温度ヒューズ４２に近づけ、その温度ヒューズ４２を
切断して前記定着ロ−ラ３７のヒータ４１への通電を停
止する定着装置２５において、前記軸受４０を、前記定
着ローラ３７と接触する軸受本体５３と、それより融点
が低くその軸受本体５３外周に設けて前記フレームと接
触する低融点部材５４とで構成してなることを特徴とす
る。According to a second aspect of the present invention, the lower fixing frame 3 is mounted via a bearing 40, as in the following illustrated embodiment.
The fixing roller 37 is rotatably supported by a frame such as 5, and the pressure roller 43 is pressed against the fixing roller 37,
When the temperature of the fixing roller 37 exceeds a certain temperature, the bearing 40 is melted at that temperature, the fixing roller 37 is moved to approach the temperature fuse 42, and the temperature fuse 42 is cut to fix the fixing roller 37. In the fixing device 25 in which the heater 37 of the roller 37 is de-energized, the bearing 40 is provided on the bearing main body 53 that comes into contact with the fixing roller 37 and on the outer periphery of the bearing main body 53 having a lower melting point. And a low melting point member 54 that is in contact with.
【００１１】[0011]
【作用】そして、請求項１に記載のものでは、定着ロ−
ラ３７の表面温度が一定以上になると、その温度で軸受
４０の突起４０ｃ・４０ｄまたは突起３５ｃ・３５ｄに
対応する軸受４０部分を溶解し、定着ロ−ラ３７を移動
して温度ヒューズ４２に近づけ、その温度ヒューズ４２
を切断して定着ロ−ラ３７のヒータ４１への通電を停止
する。According to the first aspect of the present invention, the fixing roller is
When the surface temperature of the roller 37 exceeds a certain temperature, the bearing 40 portion corresponding to the protrusions 40c and 40d or the protrusions 35c and 35d of the bearing 40 is melted at that temperature, and the fixing roller 37 is moved to approach the temperature fuse 42. , The temperature fuse 42
Is cut off to stop energizing the heater 41 of the fixing roller 37.
【００１２】請求項２に記載のものでは、定着ロ−ラ３
７の温度が一定以上になると、その温度で軸受４０の低
融点部材５４を溶解し、定着ロ−ラ３７を移動して温度
ヒューズ４２に近づけ、その温度ヒューズ４２を切断し
て定着ロ−ラ３７のヒータ４１への通電を停止する。According to the second aspect of the present invention, the fixing roller 3
When the temperature of 7 exceeds a certain temperature, the low melting point member 54 of the bearing 40 is melted at that temperature, the fixing roller 37 is moved to approach the temperature fuse 42, and the temperature fuse 42 is cut to fix the fixing roller. The power supply to the heater 41 of 37 is stopped.
【００１３】[0013]
【実施例】以下、図面を参照しつつ、この発明の実施例
につき説明する。図４は、この発明の一実施例である定
着装置を備えるレーザプリンタの内部機構の全体概略構
成を示す。Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an overall schematic configuration of an internal mechanism of a laser printer including a fixing device according to an embodiment of the present invention.
【００１４】図中符号１０で示すものは、プリンタ本体
である。そのプリンタ本体１０は、本体カバー１０ａを
本体ケース１０ｂに支点イを中心に開閉自在に備える。
該プリンタ本体１０内には、ほぼ中央にベルト状の感光
体１１を設ける。その感光体１１の周りには、図中矢印
で示す駆動方向に順に、帯電装置１２、現像装置１３、
転写装置１４、クリーニング装置１５を配置する。そし
て、帯電装置１２およびクリーニング装置１５の下側に
光書込み装置１６を配置する。また、その光書込み装置
１６の下側に、シートＳをセットした給紙カセット１８
を着脱自在に取り付ける。さらに、プリンタ本体１０の
図中右の正面側には、その上部寄りに、手差し給紙用ト
レイ１９を設ける。このプリンタ本体１０の上側には、
第１排紙スタック部２０を設ける。図中左の背面側に
は、排紙トレイ２２を着脱自在に取り付けて厚紙・封筒
等の腰の強いシートやＯＨＰシート・第２原図・ハクリ
紙等の腰の弱いシートも排出可能な第２排紙スタック部
２１を設ける。Reference numeral 10 in the figure denotes a printer main body. The printer body 10 is provided with a body cover 10a on a body case 10b so as to be openable and closable around a fulcrum a.
A belt-shaped photoconductor 11 is provided in the printer main body 10 substantially at the center thereof. Around the photoconductor 11, a charging device 12, a developing device 13, a developing device 13,
A transfer device 14 and a cleaning device 15 are arranged. Then, the optical writing device 16 is arranged below the charging device 12 and the cleaning device 15. Further, below the optical writing device 16, a sheet feeding cassette 18 in which a sheet S is set is placed.
Attach detachably. Further, on the front side on the right side of the printer body 10 in the figure, a manual paper feed tray 19 is provided near the upper part thereof. On the upper side of the printer body 10,
A first sheet discharge stack section 20 is provided. On the rear side on the left side of the figure, a paper ejection tray 22 is detachably attached to enable the ejection of sheets with strong elasticity such as cardboard and envelopes, and OHP sheets, the second original drawing, and sheets with weak elasticity such as tear paper. A discharge stack unit 21 is provided.
【００１５】しかして、給紙ローラ２３を駆動して給紙
カセット１８内のシートＳを矢印Ａ方向に送り出し、レ
ジストローラ２４に突き当てる。そして、そのシートＳ
をレジストローラ２４でタイミングをとって感光体１１
の上側へと送り込む。感光体１１は、矢示するごとく反
時計方向に駆動し、その際、帯電装置１２によって表面
を一様に帯電し、光書込み装置１６からのレーザ光Ｌを
照射して感光体１１上に静電潜像を形成する。この潜像
は、現像装置１３を通るときトナーによって可視像化す
る。そして、この可視像は、感光体１１の上側に搬送し
たシートＳの下面に転写装置１４により転写する。転写
後、シートＳをこの発明の定着装置２５へと搬送し、そ
こで熱と圧を加えてシートＳ上の転写画像を定着する。Then, the sheet feeding roller 23 is driven to feed the sheet S in the sheet feeding cassette 18 in the direction of arrow A, and abut against the registration roller 24. And that sheet S
The registration roller 24 at a proper timing
To the upper side of. The photoconductor 11 is driven counterclockwise as shown by the arrow, and at that time, the surface of the photoconductor 11 is uniformly charged by the charging device 12, and the laser beam L from the optical writing device 16 is irradiated to the photoconductor 11. Form a latent image. This latent image is visualized by toner as it passes through the developing device 13. Then, this visible image is transferred by the transfer device 14 to the lower surface of the sheet S conveyed to the upper side of the photoconductor 11. After the transfer, the sheet S is conveyed to the fixing device 25 of the present invention, where heat and pressure are applied to fix the transferred image on the sheet S.
【００１６】画像定着後、シートＳを定着装置２５から
排紙ローラ２８で送り出し、さらに搬送ガイド２９で上
方に案内して反転し、排紙ローラ３０によって矢印Ｂ方
向に排出し第１排紙スタック部２０上に順次スタックす
る。また、シートＳが封筒やＯＨＰシート等の場合に
は、切換ガイド３１で排紙方向を切り換えて排紙ローラ
２８でそのまま矢印Ｃ方向に送り出し、第２排紙スタッ
ク部２１上に順次スタックする。After the image is fixed, the sheet S is sent out from the fixing device 25 by the paper discharge rollers 28, further guided by the conveyance guides 29 to be reversed and discharged by the paper discharge rollers 30 in the direction of the arrow B, and the first paper discharge stack. The parts are sequentially stacked on the unit 20. When the sheet S is an envelope, an OHP sheet, or the like, the sheet ejection direction is switched by the switching guide 31, the sheet ejection roller 28 feeds the sheet S in the direction of arrow C, and the sheets are sequentially stacked on the second sheet ejection stack portion 21.
【００１７】一方、可視像転写後の感光体１１は、その
表面をクリーニング装置１５でクリーニングする。On the other hand, the surface of the photoreceptor 11 after the transfer of the visible image is cleaned by the cleaning device 15.
【００１８】ところで、図示実施例の定着装置２５は、
詳しくは図３に示すように、定着下フレーム３５と定着
上フレーム３６を上下に対向して備える。その定着下フ
レーム３５は、金属または高耐熱性材料で上向き開口の
横長箱形状につくり、両端を図示省略した固定フレーム
で支持してなる。その定着下フレーム３５の両端面に
は、図１および図２に示すように、孔４９を開け、そこ
に軸受４０を取り付けてなる。その軸受４０は、円筒形
状の一端に鍔４０ａを形成するとともに、該鍔４０ａを
除く外周に、複数の突起４０ｂ・４０ｃ・４０ｄを形成
する。そして、それら突起４０ｂ・４０ｃ・４０ｄを介
在して定着下フレーム３５で軸受４０を保持する。その
とき、軸受４０の突起４０ｃ・４０ｄで荷重を受ける。
それら軸受４０は、定着ロ−ラ３７の両端を嵌め込んで
回転自在に支持する。該定着ロ−ラ３７は、金属芯金の
外表面にテフロン加工し、内部に軸方向に貫通してヒー
タ４１を設ける。そのヒータ４１は、定着ローラ３７の
表面温度を制御する図示しない温度制御部と接続してな
る。By the way, the fixing device 25 of the illustrated embodiment is
Specifically, as shown in FIG. 3, a lower fixing frame 35 and an upper fixing frame 36 are vertically opposed to each other. The lower fixing frame 35 is made of metal or a highly heat resistant material in the shape of a horizontally long box having an upward opening, and both ends thereof are supported by fixed frames (not shown). As shown in FIGS. 1 and 2, holes 49 are formed in both end surfaces of the lower fixing frame 35, and bearings 40 are attached thereto. The bearing 40 has a flange 40a formed at one end of a cylindrical shape, and a plurality of protrusions 40b, 40c, 40d formed on the outer periphery excluding the flange 40a. Then, the bearing 40 is held by the lower fixing frame 35 with the protrusions 40b, 40c, 40d interposed. At that time, the load is applied to the projections 40c and 40d of the bearing 40.
The bearings 40 rotatably support the fixing rollers 37 by fitting both ends thereof. The fixing roller 37 has a metal cored bar having a Teflon finish on its outer surface, and a heater 41 is provided inside the fixing roller 37 so as to penetrate therethrough in the axial direction. The heater 41 is connected to a temperature control unit (not shown) that controls the surface temperature of the fixing roller 37.
【００１９】また、図３に示すように、前記定着下フレ
ーム３５の内面には、定着ロ−ラ３７の下に所定のギャ
ップδをあけて温度ヒューズ４２を配置する。その温度
ヒューズ４２は、前記図示しない温度制御部と前記ヒー
タ４１との間に配置する。Further, as shown in FIG. 3, a thermal fuse 42 is arranged on the inner surface of the lower fixing frame 35 below the fixing roller 37 with a predetermined gap δ. The temperature fuse 42 is arranged between the temperature control unit (not shown) and the heater 41.
【００２０】一方、前記定着上フレーム３６は、金属ま
たは高耐熱性材料で下向き開口の横長箱形状につくり、
両端を図示省略した固定フレームで支持してなる。その
定着上フレーム３６内には、金属芯金上にゴム層を有す
る加圧ローラ４３を収納する。その加圧ローラ４３は、
ロ−ラ軸４４を軸受４５に取り付けてなる。その軸受４
５は、図示しないガイドで案内して上下動自在に設け
る。その軸受４５には、付勢部材４６の一端を押し当て
て設ける。その付勢部材４６は、他端を定着上フレーム
３６の適宜位置に押し当て、前記加圧ロ−ラ４３を付勢
して前記定着ロ−ラ３７に押し当ててなる。On the other hand, the fixing upper frame 36 is made of metal or a high heat resistant material in the shape of a horizontally elongated box having a downward opening.
Both ends are supported by fixed frames (not shown). A pressure roller 43 having a rubber layer on a metal core is housed in the upper fixing frame 36. The pressure roller 43 is
The roller shaft 44 is attached to the bearing 45. The bearing 4
5 is provided so as to be vertically movable by guiding with a guide (not shown). The bearing 45 is provided by pressing one end of the biasing member 46. The urging member 46 presses the other end to an appropriate position of the upper fixing frame 36, urges the pressure roller 43 and presses it against the fixing roller 37.
【００２１】しかして、図示しない温度制御部の故障に
よりヒータ４１が加熱して定着ロ−ラ３７の表面温度が
一定以上になると、その温度で軸受４０を加熱する。そ
のとき、図１に示すように、軸受４０の下半周の突起４
０ｃ・４０ｄに荷重が加わっているので、それらの突起
４０ｃ・４０ｄが軸受４０の他の部分より溶解しやすく
なる。そして、それらの突起４０ｃ・４０ｄが溶解する
につれ前記付勢部材４６の付勢力で付勢して定着ロ−ラ
３７を移動し、突起４０ｂ・４０ｃ・４０ｄによる隙間
４８を狭めて前記温度ヒューズ４２に近づける。そうし
て、定着ロ−ラ３７の高熱で温度ヒューズ４２を切断
し、該定着ロ−ラ３７のヒータ４１への通電を停止す
る。When the heater 41 heats up due to a failure of the temperature control unit (not shown) and the surface temperature of the fixing roller 37 becomes a certain temperature or higher, the bearing 40 is heated at that temperature. At that time, as shown in FIG.
Since the load is applied to 0c and 40d, the protrusions 40c and 40d are more easily melted than the other parts of the bearing 40. Then, as the protrusions 40c, 40d are melted, the fixing roller 37 is moved by being urged by the urging force of the urging member 46, and the gap 48 formed by the protrusions 40b, 40c, 40d is narrowed, and the temperature fuse 42 is heated. Approach to. Then, the thermal fuse 42 is cut by the high heat of the fixing roller 37, and the energization of the heater 41 of the fixing roller 37 is stopped.
【００２２】なお、上述した実施例では、定着ロ−ラ３
７の軸受４０の外周に複数の突起４０ｂ・４０ｃ・４０
ｄを形成し、それら複数の突起４０ｂ・４０ｃ・４０ｄ
を介在して定着下フレーム３５で軸受４０を保持する構
成とした。しかし、図５に示すように、定着下フレーム
３５にあけた軸受取付孔４９の内周に複数の突起３５ｂ
・３５ｃ・３５ｄを形成し、それら複数の突起３５ｂ・
３５ｃ・３５ｄを介在して定着下フレーム３５で軸受４
０を保持する構成としてもよい。In the above embodiment, the fixing roller 3 is used.
7, a plurality of protrusions 40b, 40c, 40 on the outer circumference of the bearing 40
d to form a plurality of protrusions 40b, 40c, 40d
The bearing 40 is held by the lower fixing frame 35 with the interposition of. However, as shown in FIG. 5, a plurality of protrusions 35 b are formed on the inner periphery of the bearing mounting hole 49 formed in the lower fixing frame 35.
. 35c and 35d are formed, and a plurality of protrusions 35b and
The bearing 4 is mounted on the lower fixing frame 35 with the interposition of 35c and 35d.
It may be configured to hold 0.
【００２３】しかして、定着ロ−ラ３７の表面温度が一
定以上になると、その温度で軸受４０を加熱する。その
とき、図５に示すように、前記突起３５ｃ・３５ｄに荷
重が加わっているので、それらの突起３５ｃ・３５ｄに
対応する軸受４０部分が他の部分より溶解しやすくな
る。そして、それらの軸受４０部分が溶解するにつれ加
圧ロ−ラを付勢する付勢部材の付勢力で定着ロ−ラ３７
を移動し、突起３５ｂ・３５ｃ・３５ｄによる隙間４８
を狭めて温度ヒューズに近づける。そうして、定着ロ−
ラ３７の高熱で温度ヒューズを切断し、該定着ロ−ラ３
７のヒータへの通電を停止する。When the surface temperature of the fixing roller 37 exceeds a certain level, the bearing 40 is heated at that temperature. At that time, as shown in FIG. 5, since a load is applied to the protrusions 35c and 35d, the bearing 40 portion corresponding to the protrusions 35c and 35d is more easily melted than the other portions. The fixing roller 37 is urged by the urging force of the urging member that urges the pressure roller as the bearing 40 portion melts.
And the gap 48 formed by the protrusions 35b, 35c, and 35d.
To close the thermal fuse. Then, the fixing roll
The thermal fuse is cut by the high heat of the roller 37, and the fixing roller 3
Stop energizing the heater of No. 7.
【００２４】また、上述したすべての実施例では、複数
の突起４０ｂ・４０ｃ・４０ｄまたは複数の突起３５ｂ
・３５ｃ・３５ｄを介在して定着下フレーム３５で軸受
４０を保持する構成とした。しかし、図６および図７に
示すように構成してもよい。図中符号５３は軸受本体、
５４は低融点部材で、それらで軸受４０を構成する。該
軸受本体５３は、一端に鍔５３ａを有する円筒形状につ
くり、内周を定着ロ−ラ３７と接触する。一方、低融点
部材５４は、軸受本体５３より融点が低い材料で一端に
鍔５４ａを有する円筒形状につくり、該軸受本体５３の
外周に接着して設けて定着下フレーム３５と接触する。
そして、前記軸受５２を介して定着下フレーム３５で定
着ロ−ラ３７を回転自在に保持してなる。Further, in all the above-mentioned embodiments, the plurality of protrusions 40b, 40c, 40d or the plurality of protrusions 35b are provided.
The bearing 40 is held by the lower fixing frame 35 with the interposition of 35c and 35d. However, the configuration may be as shown in FIGS. 6 and 7. Reference numeral 53 in the drawing denotes a bearing body,
Reference numeral 54 denotes a low melting point member, which constitutes the bearing 40. The bearing main body 53 is formed in a cylindrical shape having a flange 53a at one end, and the inner circumference thereof contacts the fixing roller 37. On the other hand, the low melting point member 54 is made of a material having a lower melting point than the bearing main body 53 and is formed into a cylindrical shape having a flange 54a at one end, and is provided by being adhered to the outer periphery of the bearing main body 53 to contact the lower fixing frame 35.
The fixing roller 37 is rotatably held by the lower fixing frame 35 via the bearing 52.
【００２５】しかして、定着ロ−ラ３７の表面温度が一
定以上になると、その温度で軸受４０の低融点部材５４
を溶解する。そして、低融点部材５４が溶解するにつれ
加圧ロ−ラを付勢する付勢部材で加圧ロ−ラとともに定
着ロ−ラ３７を移動する。そうして、温度ヒューズ４２
に近づけ、定着ロ−ラ３７の高熱で該温度ヒューズ４２
を切断し、該定着ロ−ラ３７のヒータ４１への通電を停
止する。低融点部材５４を溶解するので、軸受４０が一
層速やかに溶解する。However, when the surface temperature of the fixing roller 37 exceeds a certain temperature, the low melting point member 54 of the bearing 40 is heated at that temperature.
Dissolve. Then, as the low melting point member 54 is melted, the fixing roller 37 is moved together with the pressure roller by an urging member which urges the pressure roller. Then, the thermal fuse 42
The fixing roller 37 with high heat, the temperature fuse 42
Is cut off and the energization of the heater 41 of the fixing roller 37 is stopped. Since the low melting point member 54 is melted, the bearing 40 is melted more quickly.
【００２６】なお、上述した実施例では、軸受４０の低
融点部材５４を円筒形状として定着下フレーム３５と接
触する構成とした。しかし、図示省略するが、低融点部
材または定着下フレームに複数の突起を形成し、それら
複数の突起を介在して該定着下フレームで該軸受を保持
する構成とすることもできる。すると、定着ロ−ラの表
面温度が一定以上になるとき、軸受が一層溶解しやすく
なる。In the embodiment described above, the low melting point member 54 of the bearing 40 has a cylindrical shape and is in contact with the lower fixing frame 35. However, although not shown, a plurality of protrusions may be formed on the low melting point member or the lower fixing frame, and the bearing may be held by the lower fixing frame via the plurality of protrusions. Then, when the surface temperature of the fixing roller exceeds a certain temperature, the bearing becomes more likely to melt.
【００２７】[0027]
【発明の効果】したがって、この発明によれば、定着ロ
−ラの表面温度が一定以上になると、請求項１に記載の
ものでは、その温度で軸受の突起または突起に対応する
軸受部分を溶解し、請求項２に記載のものでは、その温
度で軸受の低融点部材を溶解するので、定着ロ−ラのヒ
ータへの通電を簡単な構成で速やかに停止することがで
きる。Therefore, according to the present invention, when the surface temperature of the fixing roller becomes a certain temperature or higher, the protrusion of the bearing or the bearing portion corresponding to the protrusion is melted at that temperature. However, according to the second aspect, since the low melting point member of the bearing is melted at that temperature, it is possible to quickly stop the energization of the heater of the fixing roller with a simple configuration.
【図１】この発明の一実施例である定着装置の縦断面図
である。FIG. 1 is a vertical sectional view of a fixing device according to an embodiment of the present invention.
【図２】その定着装置のａ−ａ線の縦断面図である。FIG. 2 is a vertical cross-sectional view taken along line aa of the fixing device.
【図３】その定着装置の全体概略構成図である。FIG. 3 is an overall schematic configuration diagram of the fixing device.
【図４】その定着装置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. 4 is a schematic configuration diagram of an entire internal mechanism of a laser printer including the fixing device.
【図５】他の実施例である定着装置の図２と同様な縦断
面図である。FIG. 5 is a vertical sectional view of a fixing device according to another embodiment, similar to FIG.
【図６】さらに他の実施例である定着装置の縦断面図で
ある。FIG. 6 is a vertical sectional view of a fixing device according to still another embodiment.
【図７】その定着装置のｂ−ｂ線の縦断面図である。FIG. 7 is a vertical cross-sectional view taken along line bb of the fixing device.
【図８】従来の定着装置の概略図である。FIG. 8 is a schematic view of a conventional fixing device.
【図９】その定着ロ−ラと軸受部分の拡大断面図であ
る。FIG. 9 is an enlarged sectional view of the fixing roller and a bearing portion.
【図１０】従来の別の定着装置における部分概略図であ
る。FIG. 10 is a partial schematic view of another conventional fixing device.
２５ 定着装置 ３５ 定着下フレーム ３５ｂ・３５ｃ・３５ｄ 突起 ３７ 定着ロ−ラ ４０ 軸受 ４０ｂ・４０ｃ・４０ｄ 突起 ４１ ヒータ ４２ 温度ヒューズ ４３ 加圧ロ−ラ ５３ 軸受本体 ５４ 低融点部材 25 Fixing Device 35 Fixing Lower Frame 35b / 35c / 35d Protrusion 37 Fixing Roller 40 Bearing 40b / 40c / 40d Protrusion 41 Heater 42 Thermal Fuse 43 Pressure Roller 53 Bearing Main Body 54 Low Melting Point Member
Claims (2)
転自在に支持し、その定着ロ−ラに加圧ロ−ラを押し当
て、前記定着ロ−ラの温度が一定以上になったときその
温度で軸受を溶解し、前記定着ロ−ラを移動して温度ヒ
ューズに近づけ、その温度ヒューズを切断して前記定着
ロ−ラのヒータへの通電を停止する定着装置において、
前記軸受または前記フレームに形成した複数の突起を介
在して前記フレームで前記軸受を保持してなる、定着装
置。1. A fixing roller is rotatably supported by a frame via a bearing, and a pressure roller is pressed against the fixing roller so that the temperature of the fixing roller becomes a certain temperature or more. At that time, the bearing is melted at that temperature, the fixing roller is moved to approach the temperature fuse, and the temperature fuse is cut to stop energizing the heater of the fixing roller.
A fixing device in which the bearing is held by the frame via a plurality of protrusions formed on the bearing or the frame.
転自在に支持し、その定着ロ−ラに加圧ロ−ラを押し当
て、前記定着ロ−ラの温度が一定以上になったときその
温度で軸受を溶解し、前記定着ロ−ラを移動して温度ヒ
ューズに近づけ、その温度ヒューズを切断して前記定着
ロ−ラのヒータへの通電を停止する定着装置において、
前記軸受を、前記定着ローラと接触する軸受本体と、そ
れより融点が低くその軸受本体外周に設けて前記フレー
ムと接触する低融点部材とで構成してなる、定着装置。2. A fixing roller is rotatably supported by a frame via a bearing, and a pressure roller is pressed against the fixing roller so that the temperature of the fixing roller becomes a certain temperature or more. At that time, the bearing is melted at that temperature, the fixing roller is moved to approach the temperature fuse, and the temperature fuse is cut to stop energizing the heater of the fixing roller.
A fixing device comprising the bearing main body that comes into contact with the fixing roller, and a low-melting point member that has a lower melting point than the fixing body and that is provided on the outer circumference of the bearing main body and comes into contact with the frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30036692A JP3155094B2 (en) | 1992-10-13 | 1992-10-13 | Fixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30036692A JP3155094B2 (en) | 1992-10-13 | 1992-10-13 | Fixing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06124050A true JPH06124050A (en) | 1994-05-06 |
| JP3155094B2 JP3155094B2 (en) | 2001-04-09 |
Family
ID=17883915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30036692A Expired - Fee Related JP3155094B2 (en) | 1992-10-13 | 1992-10-13 | Fixing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3155094B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09101699A (en) * | 1995-10-05 | 1997-04-15 | Nec Corp | Fixing device for electrophotographic system |
| JP2009098402A (en) * | 2007-10-17 | 2009-05-07 | Ricoh Co Ltd | Fixing apparatus, image forming apparatus, and frame |
| US7574165B2 (en) | 2003-09-26 | 2009-08-11 | Sharp Kabushiki Kaisha | Fixing method, fixing device, and image forming apparatus |
| US8009998B2 (en) | 2008-05-29 | 2011-08-30 | Brother Kogyo Kabushiki Kaisha | Fixing device |
| CN102193454A (en) * | 2010-03-19 | 2011-09-21 | 柯尼卡美能达商用科技株式会社 | Fixing device |
| JP2013213918A (en) * | 2012-04-02 | 2013-10-17 | Konica Minolta Inc | Attachment structure of bearing member, fixing device, and image forming apparatus |
-
1992
- 1992-10-13 JP JP30036692A patent/JP3155094B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09101699A (en) * | 1995-10-05 | 1997-04-15 | Nec Corp | Fixing device for electrophotographic system |
| US7574165B2 (en) | 2003-09-26 | 2009-08-11 | Sharp Kabushiki Kaisha | Fixing method, fixing device, and image forming apparatus |
| JP2009098402A (en) * | 2007-10-17 | 2009-05-07 | Ricoh Co Ltd | Fixing apparatus, image forming apparatus, and frame |
| US8009998B2 (en) | 2008-05-29 | 2011-08-30 | Brother Kogyo Kabushiki Kaisha | Fixing device |
| CN102193454A (en) * | 2010-03-19 | 2011-09-21 | 柯尼卡美能达商用科技株式会社 | Fixing device |
| JP2011197338A (en) * | 2010-03-19 | 2011-10-06 | Konica Minolta Business Technologies Inc | Fixing device |
| JP2013213918A (en) * | 2012-04-02 | 2013-10-17 | Konica Minolta Inc | Attachment structure of bearing member, fixing device, and image forming apparatus |
| US8942609B2 (en) | 2012-04-02 | 2015-01-27 | Konica Minolta Business Technologies, Inc. | Mounting structure for bearing member, fixing device, and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3155094B2 (en) | 2001-04-09 |
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