JPH01157368U

JPH01157368U -

Info

Publication number: JPH01157368U
Application number: JP5292788U
Authority: JP
Priority date: 1988-04-20
Filing date: 1988-04-20
Publication date: 1989-10-30

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図はこの考案の一実施例を示し、Ａはころ
の内径ところ軸の外径の関係を示す正断面図、Ｂ
はころを多層構造とした変形例を示す正断面図、
Ｃはころの軸方向長さところ軸におけるころの軸
方向の動きを規制している部分の長さの関係を示
す正断面図、Ｄは熱ローラが加熱前温度であると
きの作用説明用の側面図、Ｅは熱ローラが加熱温
度であるときの作用説明用の側面図、第２図は従
来の非接触型サーミスタを用いた定着装置を示す
全体側面図、第３図は同上のサーミスタ部の拡大
正面図である。１……熱ローラ、２……サーミスタ、３……こ
ろ、９……ころ軸。 Figure 1 shows an embodiment of this invention, where A is a front sectional view showing the relationship between the inner diameter of the roller and the outer diameter of the shaft, and B
A front sectional view showing a modification example in which the roller has a multilayer structure.
C is a front cross-sectional view showing the relationship between the axial length of the roller and the length of the part of the shaft that regulates the axial movement of the roller, and D is a diagram for explaining the action when the heat roller is at the pre-heating temperature. A side view, E is a side view for explaining the operation when the heat roller is at a heating temperature, FIG. 2 is an overall side view showing a fixing device using a conventional non-contact thermistor, and FIG. 3 is the same thermistor section as above. FIG. 1... Heat roller, 2... Thermistor, 3... Roller, 9... Roller shaft.

Claims

【実用新案登録請求の範囲】１非接触型サーミスタが熱ローラの表面と所定
の隙間をおいて配置され、この隙間を保持するこ
ろがころ軸に回転可能に支持されて前記熱ローラ
の表面に接触して配置された電子写真式複写機等
の熱ローラ定着装置において、前記ころの内径を
Ｄ、ころ軸の外径をｄとすると、熱ローラの加熱
前温度でＤ＞ｄ、加熱温度でＤ＜ｄの関係となる
ように、前記ころおよびころ軸の材質が設定され
ていることを特徴とする熱ローラ定着装置。２前記ころが多層構造となつており、その外周
面側の材質の熱膨張率をＡ、内周面側の材質の熱
膨張率をａとすると、Ａ＜ａの関係となつている
請求項１記載の熱ローラ定着装置。３非接触型サーミスタが熱ローラの表面と所定
の隙間をおいて配置され、この隙間を保持するこ
ろがころ軸に回転可能に支持されて前記熱ローラ
の表面に接触して配置された電子写真式複写機等
の熱ローラ定着装置において、前記ころの軸方向
の長さをＬ、ころ軸におけるころの軸方向の動き
を規制している部分の長さをｌとすると、熱ロー
ラの加熱前温度でＬ＜ｌ、加熱温度でＬ＞ｌの関
係となるように、前記ころおよびころ軸の材質が
設定されていることを特徴とする熱ローラ定着装
置。[Claims for Utility Model Registration] 1. A non-contact thermistor is disposed with a predetermined gap from the surface of the heat roller, and a roller that maintains this gap is rotatably supported by a roller shaft and attached to the surface of the heat roller. In a heat roller fixing device such as an electrophotographic copying machine that is placed in contact with each other, if the inner diameter of the roller is D and the outer diameter of the roller shaft is d, the temperature before heating of the heat roller is D>d, and the heating temperature is A heat roller fixing device characterized in that materials of the roller and roller shaft are set so that D<d. 2. A claim in which the roller has a multilayer structure, and where A is the coefficient of thermal expansion of the material on the outer circumference side and a is the coefficient of thermal expansion of the material on the inner circumference side, the relationship is A<a. 1. The heat roller fixing device according to 1. 3. An electrophotograph in which a non-contact thermistor is arranged with a predetermined gap from the surface of a heat roller, and a roller that maintains this gap is rotatably supported by a roller shaft and is arranged in contact with the surface of the heat roller. In a heat roller fixing device such as a type copying machine, if the length of the roller in the axial direction is L, and the length of the portion of the roller shaft that restricts the axial movement of the roller is l, then before the heat roller is heated, A heat roller fixing device characterized in that materials of the roller and roller shaft are set so that L<l in temperature and L>l in heating temperature.