JPS622070U

JPS622070U -

Info

Publication number: JPS622070U
Application number: JP9459785U
Authority: JP
Priority date: 1985-06-21
Filing date: 1985-06-21
Publication date: 1987-01-08

Description

[Brief explanation of the drawing]

図面は本考案に係る定着装置の実施例を示し、
第１図は電子写真複写機における定着装置の制御
装置の回路図、第２図は定着装置の断面図、第３
図イないしヌは制御装置内での各信号の状態を示
すグラフで、第３図イは交流電源の電圧、第３図
ロはトランジスタＴｒ１のベース電圧、第３図ハ
はトランジスタＴｒ１のオンオフ状態、第３図ニ
はトランジスタＴｒ２のオンオフ状態、第３図ホ
ないしトはヒータへの供給電力が多い場合の、そ
れぞれ、サイリスタのアノード電圧、トライアツ
クのオンオフ状態、ヒータへの通電波形、第３図
チないしヌはヒータへの供給電力が少ない場合の
、それぞれ、サイリスタのアノード電圧、トライ
アツクのオンオフ状態、ヒータへの通電波形を示
し、第４図イはヒータへの供給電力の変化を示す
グラフ、第４図ロは加熱ローラの表面の変化特性
を示すグラフ、第５図は定着装置の温度制御動作
を示すフローチヤート、第６図は別の実施例を示
す制御装置の回路図、第７図はさらに別の実施例
を示す制御装置の回路図である。１……加熱ローラ、１ａ……ヒータ、９……表
面温度検出手段、Ｐ……記録紙、Ｘ……ヒータ作
動制御手段。 The drawings show an embodiment of the fixing device according to the present invention,
Fig. 1 is a circuit diagram of a control device for a fixing device in an electrophotographic copying machine, Fig. 2 is a sectional view of the fixing device, and Fig. 3 is a sectional view of the fixing device.
Figures A to N are graphs showing the state of each signal within the control device, where Figure 3A is the voltage of the AC power supply, Figure 3B is the base voltage of the transistor Tr1, and Figure 3C is the on/off state of the transistor Tr1. , FIG. 3 D shows the on/off state of the transistor Tr2, and FIG. 4A and 4B respectively show the anode voltage of the thyristor, the on/off state of the triax, and the energization waveform to the heater when the power supplied to the heater is small, and Figure 4A is a graph showing changes in the power supplied to the heater. FIG. 4B is a graph showing the change characteristics of the surface of the heating roller, FIG. 5 is a flowchart showing the temperature control operation of the fixing device, FIG. 6 is a circuit diagram of the control device showing another embodiment, and FIG. FIG. 2 is a circuit diagram of a control device showing still another embodiment. DESCRIPTION OF SYMBOLS 1... Heat roller, 1a... Heater, 9... Surface temperature detection means, P... Recording paper, X... Heater operation control means.

Claims

[Scope of utility model registration request]

surface temperature detection means for detecting the temperature of the surface of the roller, comprising a heating roller that melts and fixes the heat-fusible toner attached to the recording paper by heating the recording paper in a contact state; The fixing device is provided with a heater operation control means for controlling the operation of a heater built into the heating roller based on information from the surface temperature detection means, wherein the heater operation control means controls the contact between the recording paper and the heating roller. Sometimes, a first state in which a large amount of power is supplied to the heater when the surface temperature detected by the surface temperature detection means falls below the set temperature, and a state in which a large amount of power is supplied to the heater when the detected surface temperature becomes higher than the set temperature than the first state. A fixing device that controls the operation of a heater by switching to a second state in which a small amount of electric power is supplied to the heater.