JP2008209718A5 - - Google Patents

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Publication number
JP2008209718A5
JP2008209718A5 JP2007046933A JP2007046933A JP2008209718A5 JP 2008209718 A5 JP2008209718 A5 JP 2008209718A5 JP 2007046933 A JP2007046933 A JP 2007046933A JP 2007046933 A JP2007046933 A JP 2007046933A JP 2008209718 A5 JP2008209718 A5 JP 2008209718A5
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JP
Japan
Prior art keywords
current
recording paper
pressure roller
threshold value
heater
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Application number
JP2007046933A
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Japanese (ja)
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JP2008209718A (en
JP5110907B2 (en
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Priority to JP2007046933A priority Critical patent/JP5110907B2/en
Priority claimed from JP2007046933A external-priority patent/JP5110907B2/en
Publication of JP2008209718A publication Critical patent/JP2008209718A/en
Publication of JP2008209718A5 publication Critical patent/JP2008209718A5/ja
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Publication of JP5110907B2 publication Critical patent/JP5110907B2/en
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Claims (2)

筒状のフィルムと、前記フィルムの内面に接触するヒータと、前記フィルムを介して前記ヒータと共に記録紙を搬送するニップ部を形成する加圧ローラと、を有し、前記ニップ部で記録紙上の未定着画像を記録紙に加熱定着する定着部と、前記ヒータに流れる電流を検出する電流検出回路と、商用電源から前記ヒータへの給電回路中に設けられているリレーと、前記電流検出回路で検出した電流値が電流閾値を超えると前記リレーを開放するコントローラと、を有する画像形成装置において、  A cylindrical film; a heater that contacts the inner surface of the film; and a pressure roller that forms a nip portion that conveys the recording paper together with the heater via the film, and the recording paper is on the recording paper at the nip portion. A fixing unit that heat-fixes an unfixed image on a recording paper, a current detection circuit that detects a current flowing through the heater, a relay provided in a power supply circuit from a commercial power source to the heater, and the current detection circuit. A controller that opens the relay when the detected current value exceeds a current threshold,
前記加圧ローラが回転停止している時の前記電流閾値が、回転している時の前記電流閾値よりも低く設定されることを特徴とする画像形成装置。  The image forming apparatus, wherein the current threshold value when the pressure roller is stopped is set lower than the current threshold value when the pressure roller is rotating. 導電性の定着スリーブと、前記定着スリーブに渦電流が発生するように磁束を発生させる励磁コイルと、前記定着スリーブに接触して記録紙を搬送するニップ部を形成する加圧ローラと、を有し、渦電流により発熱する前記定着スリーブの熱を利用して前記ニップ部で記録紙上の未定着画像を記録紙に加熱定着する定着部と、前記励磁コイルに流れる電流を検出する電流検出回路と、商用電源から前記励磁コイルへの給電回路中に設けられているリレーと、前記電流検出回路で検出した電流値が電流閾値を超えると前記リレーを開放するコントローラと、を有する画像形成装置において、  A conductive fixing sleeve; an exciting coil that generates magnetic flux so that an eddy current is generated in the fixing sleeve; and a pressure roller that forms a nip portion that contacts the fixing sleeve and conveys recording paper. A fixing unit that heats and fixes an unfixed image on the recording paper on the recording paper using the heat of the fixing sleeve that generates heat due to an eddy current; and a current detection circuit that detects a current flowing through the excitation coil; An image forming apparatus comprising: a relay provided in a power supply circuit from a commercial power supply to the exciting coil; and a controller that opens the relay when a current value detected by the current detection circuit exceeds a current threshold value.
前記加圧ローラが回転停止している時の前記電流閾値が、回転している時の前記電流閾値よりも低く設定されることを特徴とする画像形成装置。  The image forming apparatus, wherein the current threshold value when the pressure roller is stopped is set lower than the current threshold value when the pressure roller is rotating.
JP2007046933A 2007-02-27 2007-02-27 Image forming apparatus Active JP5110907B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007046933A JP5110907B2 (en) 2007-02-27 2007-02-27 Image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007046933A JP5110907B2 (en) 2007-02-27 2007-02-27 Image forming apparatus

Publications (3)

Publication Number Publication Date
JP2008209718A JP2008209718A (en) 2008-09-11
JP2008209718A5 true JP2008209718A5 (en) 2010-04-15
JP5110907B2 JP5110907B2 (en) 2012-12-26

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ID=39786068

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007046933A Active JP5110907B2 (en) 2007-02-27 2007-02-27 Image forming apparatus

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JP (1) JP5110907B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101002582B1 (en) * 2008-09-27 2010-12-20 주식회사 오토닉스 Temperature controller having phase control function and zero cross cycle control function
JP5448411B2 (en) * 2008-10-24 2014-03-19 キヤノン株式会社 Image forming apparatus
KR20120083764A (en) 2011-01-18 2012-07-26 삼성전자주식회사 Apparatus and method for protecting fusing unit in image forming apparatus, and image forming apparatus having it
JP6269327B2 (en) * 2014-06-04 2018-01-31 株式会社リコー Control device and image forming apparatus
JP6170885B2 (en) * 2014-07-28 2017-07-26 京セラドキュメントソリューションズ株式会社 Fixing apparatus and image forming apparatus
US10845741B2 (en) * 2018-11-09 2020-11-24 Canon Kabushiki Kaisha Image forming apparatus in which a first circuit for supplying power to a heater and second and third circuits electrically isolated from the first circuit are linearly disposed on a circuit board surface

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05313536A (en) * 1992-05-08 1993-11-26 Canon Inc Thermal fixing device for image forming device
JP4035146B2 (en) * 2003-02-20 2008-01-16 松下電器産業株式会社 Heat fixing device and control method thereof
JP4593903B2 (en) * 2003-11-05 2010-12-08 キヤノン株式会社 Heating device

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