JPS6477887A - Heater control device - Google Patents

Heater control device

Info

Publication number
JPS6477887A
JPS6477887A JP23457587A JP23457587A JPS6477887A JP S6477887 A JPS6477887 A JP S6477887A JP 23457587 A JP23457587 A JP 23457587A JP 23457587 A JP23457587 A JP 23457587A JP S6477887 A JPS6477887 A JP S6477887A
Authority
JP
Japan
Prior art keywords
electric current
heater
becomes
shut
current detection
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
JP23457587A
Other languages
Japanese (ja)
Inventor
Ryo Muto
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP23457587A priority Critical patent/JPS6477887A/en
Publication of JPS6477887A publication Critical patent/JPS6477887A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To make it possible to shut off an electric power source with an abnormal spark quickly sensed by changing an electric current detection level in an electric current detection circuit according to the detected temperature of a heater, and turning a shut-off contact off according to the output of the circuit. CONSTITUTION:A current transformer 7 and an electric current detection circuit 8 are provided to detect a heater electric current, and an electric current detection level is made to change according to the heater 2 temperature detected with a temperature detection element 3. It the high heater electric current flows by some accident, for instance: the glass tube of the heater 2 breaks, a nichrome wire in the inside touches to a casing, and a spark etc. occurs; output becomes a H level and C87 begins charging since normal rotation input becomes higher than reverse rotation input in a comparator 84, the TRS89 becomes ON when the base electric potential of the TRS89 becomes the Zener voltage of the ZD88, electric current flows in a coil 6-1 of a trip type relay 6, and the heater circuit is shut off.
JP23457587A 1987-09-18 1987-09-18 Heater control device Pending JPS6477887A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23457587A JPS6477887A (en) 1987-09-18 1987-09-18 Heater control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23457587A JPS6477887A (en) 1987-09-18 1987-09-18 Heater control device

Publications (1)

Publication Number Publication Date
JPS6477887A true JPS6477887A (en) 1989-03-23

Family

ID=16973163

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23457587A Pending JPS6477887A (en) 1987-09-18 1987-09-18 Heater control device

Country Status (1)

Country Link
JP (1) JPS6477887A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011248098A (en) * 2010-05-27 2011-12-08 Konica Minolta Business Technologies Inc Fixing device and image forming apparatus
JP2013122486A (en) * 2011-12-09 2013-06-20 Konica Minolta Business Technologies Inc Image forming apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011248098A (en) * 2010-05-27 2011-12-08 Konica Minolta Business Technologies Inc Fixing device and image forming apparatus
JP2013122486A (en) * 2011-12-09 2013-06-20 Konica Minolta Business Technologies Inc Image forming apparatus

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