JPS5699372A - Temperature control device of fixing device - Google Patents

Temperature control device of fixing device

Info

Publication number
JPS5699372A
JPS5699372A JP178980A JP178980A JPS5699372A JP S5699372 A JPS5699372 A JP S5699372A JP 178980 A JP178980 A JP 178980A JP 178980 A JP178980 A JP 178980A JP S5699372 A JPS5699372 A JP S5699372A
Authority
JP
Japan
Prior art keywords
temp
heater
rise
excessive
fixing
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
Application number
JP178980A
Other languages
Japanese (ja)
Inventor
Tomonobu Nakamine
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP178980A priority Critical patent/JPS5699372A/en
Publication of JPS5699372A publication Critical patent/JPS5699372A/en
Pending legal-status Critical Current

Links

Landscapes

  • Fixing For Electrophotography (AREA)
  • Control Of Temperature (AREA)

Abstract

PURPOSE: To obtain a temp. control device of a fixing device which permits sure prevention of firing owing to excessive rise of temp., by detecting the excessive rise of temp. of the heat-fixing heater of a copying apparatus and interrupting the power supply to the heater.
CONSTITUTION: According to the temp. detected by a thermocouple 17, a bidirectional thyristor 4 is controlled by a differential amplifier 20, a conduction angle control circuit 23, etc., whereby the supply voltage from an AC power source 1 to be applied to a fixing heater 3 is regulated. When this thyristor 4 or the like assumes a short-circuited state on account of an accident or the like, the temp. of the heater 3 rises above the fixing temp. when the output of the differential amplifier 26 to which a predetermined comparing reference value is being applied is inverted by the temp. detection output of the thermocouple 17 corresponding to the excessive rise of the temp., a transistor 27 conducts, and the voltage supply to the heater 3 of the power source 1 is interrupted by a relay 28. Hence, the power supply to the heater is rapidly interrupted in prompt response to the excessive temp. rise without using any fuse or the like, and the firing owing to the excessive temp. rise is surely prevented.
COPYRIGHT: (C)1981,JPO&Japio
JP178980A 1980-01-11 1980-01-11 Temperature control device of fixing device Pending JPS5699372A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP178980A JPS5699372A (en) 1980-01-11 1980-01-11 Temperature control device of fixing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP178980A JPS5699372A (en) 1980-01-11 1980-01-11 Temperature control device of fixing device

Publications (1)

Publication Number Publication Date
JPS5699372A true JPS5699372A (en) 1981-08-10

Family

ID=11511333

Family Applications (1)

Application Number Title Priority Date Filing Date
JP178980A Pending JPS5699372A (en) 1980-01-11 1980-01-11 Temperature control device of fixing device

Country Status (1)

Country Link
JP (1) JPS5699372A (en)

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