JPS5931706B2 - Heat fixing roller - Google Patents
Heat fixing rollerInfo
- Publication number
- JPS5931706B2 JPS5931706B2 JP12467576A JP12467576A JPS5931706B2 JP S5931706 B2 JPS5931706 B2 JP S5931706B2 JP 12467576 A JP12467576 A JP 12467576A JP 12467576 A JP12467576 A JP 12467576A JP S5931706 B2 JPS5931706 B2 JP S5931706B2
- Authority
- JP
- Japan
- Prior art keywords
- inner cylinder
- heater
- cylinder
- outer cylinder
- 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.)
- Expired
Links
Landscapes
- Fixing For Electrophotography (AREA)
Description
【発明の詳細な説明】
本発明は、複写機において感光体又は転写紙に形成され
たトナー像を加熱融解して感光体又は転写紙に定着させ
るローラーに関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roller that heats and melts a toner image formed on a photoconductor or transfer paper in a copying machine and fixes it on the photoconductor or transfer paper.
従来のヒートパイプ型式の加熱定着ローラーは、ヒータ
ーヘ電流を供給する回路中にサーミスタ又はヒューズを
設けて、ローラーが異常高温になつた場合にサーミスタ
の作動により又はヒューズの切断によりヒーターヘの給
電を停止するように構成されている。しかし、上記サー
ミスタおよびヒューズが故障した場合には加熱定着ロー
ラーが異常高温になつてもヒーターヘの給電が継続され
るため危険である。本発明の目的は、加熱定着ローラー
が異常高温になつた場合に確実にヒータヘの給電を停止
することができる加熱定着ローラーを提供することにあ
る。Conventional heat pipe type heat fixing rollers have a thermistor or fuse installed in the circuit that supplies current to the heater, and when the roller reaches an abnormally high temperature, the supply of power to the heater is stopped by activating the thermistor or cutting the fuse. It is configured as follows. However, if the thermistor and fuse break down, it is dangerous because power continues to be supplied to the heater even if the heating and fixing roller reaches an abnormally high temperature. SUMMARY OF THE INVENTION An object of the present invention is to provide a heat fixing roller that can reliably stop power supply to a heater when the heat fixing roller reaches an abnormally high temperature.
以下に図示した実施例にもとずいて本発明を説明する。The present invention will be explained below based on the illustrated embodiments.
第１図において符号１は外筒を示しており、この外筒１
内には内筒２が配設されている。In FIG. 1, reference numeral 1 indicates an outer cylinder, and this outer cylinder 1
An inner cylinder 2 is disposed inside.
上記外筒１と内筒２との間には熱媒液３が収容されてい
る。内筒２の両端部は外筒１に溶接されており、内筒２
と外筒１との間は密封状態に保持される。内筒２の内部
には、ハロゲンランプなどのヒーター４が配設されてい
ると共に、該ヒーター４へ電流を供給する回路内に設け
られたスイッチのアクチュエーター５が配設されている
。上記外筒１に固設された軸１ａには軸１ａを回転させ
るため歯車Ｉｂが設けられている。上記ヒーター４によ
り内筒２が加熱されると内筒２はこれに接触している熱
媒液３を加熱して気化させ、その気化した気体は外筒１
に接触して外筒１に液化熱を与えて液化し、順次に熱媒
液３の気化および気化した気体の液化というサイクルを
繰り返えすことにより外筒１はほぼ一定の温度に加熱さ
れる。上記熱媒液３が気化しやすいように内筒２と外筒
１との間の気体の圧力を低くすることが望ましい。本発
明のローラーは、第１図に示すように外筒１と内筒２と
の端部を直接に溶接する構成でなく、第２図に示すよう
に外筒１と内筒２の端部間に結合部材６を介在させ、内
筒１および外筒２と結合部材６とを溶接する構成でもよ
い。上記外筒１と内筒２との溶接部Ａ又は外筒１と内筒
２と結合部材６との溶接部Ｂ，Ｃおよび外筒１の破壊強
度は、内筒２のそれより非常に大きくしてローラーが異
常高温になつた場合に内筒２のみが変形するように構成
されている。A heat transfer liquid 3 is accommodated between the outer cylinder 1 and the inner cylinder 2. Both ends of the inner cylinder 2 are welded to the outer cylinder 1, and the inner cylinder 2
The space between and the outer cylinder 1 is maintained in a sealed state. A heater 4 such as a halogen lamp is disposed inside the inner cylinder 2, and an actuator 5 of a switch provided in a circuit for supplying current to the heater 4 is disposed. A gear Ib is provided on the shaft 1a fixed to the outer cylinder 1 to rotate the shaft 1a. When the inner cylinder 2 is heated by the heater 4, the inner cylinder 2 heats and vaporizes the heat transfer liquid 3 that is in contact with it, and the vaporized gas is transferred to the outer cylinder 1.
The outer cylinder 1 is heated to a substantially constant temperature by repeating the cycle of applying liquefaction heat to the outer cylinder 1 and liquefying it, successively vaporizing the heat transfer liquid 3 and liquefying the vaporized gas. . It is desirable to lower the pressure of the gas between the inner cylinder 2 and the outer cylinder 1 so that the heat transfer liquid 3 is easily vaporized. The roller of the present invention does not have a structure in which the ends of the outer cylinder 1 and the inner cylinder 2 are directly welded as shown in FIG. 1, but the ends of the outer cylinder 1 and the inner cylinder 2 as shown in FIG. The structure may be such that the inner tube 1 and the outer tube 2 are welded to each other with the coupling member 6 interposed therebetween. The fracture strength of the welded part A between the outer cylinder 1 and the inner cylinder 2 or the welded parts B and C between the outer cylinder 1 and the inner cylinder 2 and the coupling member 6, and of the outer cylinder 1 is much greater than that of the inner cylinder 2. The structure is such that only the inner cylinder 2 deforms when the roller reaches an abnormally high temperature.
すなわち、ヒーター４の継続した加熱により内筒２と外
筒１とが異常高温になつた場合には熱媒液３の気化の割
合が気体の液化の割合より大きくなるので外筒１と内筒
２との間の気体の圧力が非常に大きくなるが、この場合
に内筒２の破壊強度より内筒２と外筒１との溶接部Ａ又
は外筒１と内筒２と結合部材６との溶接部Ｂ，Ｃおよび
外筒１の破壊強度が非常に大きいように構成し、外筒１
と内筒２との間の気体の圧力により内筒２のみが第４図
および第５図に示すように内側に変形するようになつて
いる。そして、第３図に示すように内筒２が変形してス
イツチのアクチユエータ一５に接触するとスイツチが作
動してヒーター４への給電を停止するように構成されて
いる。ヒーター４への給電の停止と同時にローラーを回
転させる駆動手段も停止される。また、上記スイツチの
アクチユーエータ一５を内筒２内に配置することなく、
上記ヒーター４を破壊しやすいもので構成し、第５図に
示すように変形する内筒２によりヒーター４を破壊する
ように構成してもよい。実験例
厚さ０．６ｍ７！Ｌのステンレス板で内筒２および外筒
１を作り、それらの端部をアルゴン溶接し、外筒１の一
部の孔から内筒２と外筒１との間の気体を真空ポンプで
脱気し、次に所定量のＮｅＯｓｋオイル＃１７０（商品
名、熱媒液）を内筒２と外筒１との間に入れて、脱気し
た孔を密封した。In other words, when the inner cylinder 2 and the outer cylinder 1 reach abnormally high temperatures due to continued heating by the heater 4, the rate of vaporization of the heat transfer liquid 3 becomes greater than the rate of liquefaction of the gas, so the outer cylinder 1 and the inner cylinder 2 becomes very large, but in this case, due to the breaking strength of the inner cylinder 2, the welding part A between the inner cylinder 2 and the outer cylinder 1, or the welding part A between the outer cylinder 1, the inner cylinder 2, and the connecting member 6. The welded parts B and C and the outer cylinder 1 are constructed so that the fracture strength of the outer cylinder 1 is very high.
Due to the pressure of the gas between the inner cylinder 2 and the inner cylinder 2, only the inner cylinder 2 is deformed inward as shown in FIGS. 4 and 5. As shown in FIG. 3, when the inner cylinder 2 deforms and comes into contact with the actuator 5 of the switch, the switch is activated and the power supply to the heater 4 is stopped. At the same time as the power supply to the heater 4 is stopped, the driving means for rotating the rollers is also stopped. Moreover, without arranging the actuator 5 of the switch in the inner cylinder 2,
The heater 4 may be constructed of a material that is easily destroyed, and the heater 4 may be constructed so as to be destroyed by the deformable inner cylinder 2 as shown in FIG. Experimental example thickness: 0.6m7! The inner tube 2 and the outer tube 1 are made of L stainless steel plates, their ends are welded with argon, and the gas between the inner tube 2 and the outer tube 1 is removed from some holes in the outer tube 1 using a vacuum pump. Then, a predetermined amount of NeOsk oil #170 (trade name, heat transfer liquid) was put between the inner cylinder 2 and the outer cylinder 1, and the deaerated hole was sealed.
このようなローラーの内筒２内に１ＫＷのヒーター４を
配置して加熱したら４２５℃で熱媒液３がふきだすこと
なく内筒２がつぶれてヒーター４を破壊した。本発明に
よれば、加熱定着ローラーが異常温度になつた場合に内
筒２と外筒１との間の気体の圧力が非常に大きくなりそ
の圧力により内筒２のみが変形しその変形を検知してヒ
ーター４への給電を停止するか又は変形する内筒２によ
りヒーター４を破壊するものであるから、異常温度の場
合に確実にヒーター４への給電を停止することができる
。When a 1 KW heater 4 was placed inside the inner cylinder 2 of such a roller and heated, the inner cylinder 2 was crushed and the heater 4 was destroyed without the heating medium liquid 3 gushing out at 425°C. According to the present invention, when the heat fixing roller reaches an abnormal temperature, the gas pressure between the inner cylinder 2 and the outer cylinder 1 becomes extremely large, and only the inner cylinder 2 deforms due to the pressure, and this deformation is detected. Since the heater 4 is destroyed by the deformed inner cylinder 2, the power supply to the heater 4 can be reliably stopped in the event of an abnormal temperature.
第１図は本発明の加熱定着ローラーを示す縦断面図、第
２図は本発明の他の実施例を示す縦断面図、第３図は第
１図のＸ−Ｘ線に沿つて同上口ーラ一を切断して示す横
断面図、第４図および第５図は同上ローラーの内筒が変
形した状態を示す同上ローラーの横断面図である。
１・・・・・・外筒、２・・・・・・内筒、３・・・・
・・熱媒液、４・・・・・・ヒーター、５・・・・・・
スイツチのアクチユエータ一。FIG. 1 is a longitudinal sectional view showing a heat fixing roller of the present invention, FIG. 2 is a longitudinal sectional view showing another embodiment of the invention, and FIG. 3 is a longitudinal sectional view taken along the line X-X of FIG. FIGS. 4 and 5 are cross-sectional views of the same roller showing a state in which the inner cylinder of the above roller is deformed. 1... Outer cylinder, 2... Inner cylinder, 3...
・・Heating medium liquid, 4・・・・Heater, 5・・・・
Switch actuator.
Claims (1)
外筒との端部を直接に又は他の部材を介して間接的に溶
接し、内筒内にヒーターを配設してなる加熱定着ローラ
ーにおいて、内筒と外筒との溶接部又は内筒と外筒と他
の部材との溶接部および外筒の破壊強度を内筒のそれよ
り非常に大きくして異常高温の場合に内筒のみが変形す
るようにし、内筒の変形を検知してヒーターへの給電を
停止するか又は変形する内筒によりヒーターを破壊する
ことを特徴とする加熱定着ローラー。1 A heat transfer liquid is accommodated between the inner cylinder and the outer cylinder, and the ends of the inner cylinder and the outer cylinder are welded directly or indirectly through another member, and a heater is disposed within the inner cylinder. In a heating fixing roller made of A heat fixing roller characterized in that only the inner cylinder is deformed when the inner cylinder deforms, and the deformation of the inner cylinder is detected and power supply to the heater is stopped or the heater is destroyed by the deformed inner cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12467576A JPS5931706B2 (en) | 1976-10-18 | 1976-10-18 | Heat fixing roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12467576A JPS5931706B2 (en) | 1976-10-18 | 1976-10-18 | Heat fixing roller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5349440A JPS5349440A (en) | 1978-05-04 |
| JPS5931706B2 true JPS5931706B2 (en) | 1984-08-03 |
Family
ID=14891272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12467576A Expired JPS5931706B2 (en) | 1976-10-18 | 1976-10-18 | Heat fixing roller |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5931706B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60175406U (en) * | 1984-05-01 | 1985-11-20 | ダイハツ工業株式会社 | Drainage structure for automotive lamps |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62254383A (en) * | 1986-04-26 | 1987-11-06 | 田中 健一 | Heating roller |
-
1976
- 1976-10-18 JP JP12467576A patent/JPS5931706B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60175406U (en) * | 1984-05-01 | 1985-11-20 | ダイハツ工業株式会社 | Drainage structure for automotive lamps |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5349440A (en) | 1978-05-04 |
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