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JPS5498252A - Electrophotographic copier - Google Patents

Electrophotographic copier

Info

Publication number
JPS5498252A
JPS5498252A JP552978A JP552978A JPS5498252A JP S5498252 A JPS5498252 A JP S5498252A JP 552978 A JP552978 A JP 552978A JP 552978 A JP552978 A JP 552978A JP S5498252 A JPS5498252 A JP S5498252A
Authority
JP
Japan
Prior art keywords
toner concentration
roller
detector
heat source
toner
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
JP552978A
Other languages
Japanese (ja)
Inventor
Setsuo Soga
Ichiro Fukushima
Yasuo Asahina
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP552978A priority Critical patent/JPS5498252A/en
Publication of JPS5498252A publication Critical patent/JPS5498252A/en
Pending legal-status Critical Current

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  • Fixing For Electrophotography (AREA)

Abstract

PURPOSE: To enable always good fixation even when reflection density of an image or toner concentration varies, by changing at least one of pressure or temperature of a fixing device by detection output of a toner concentration detector.
CONSTITUTION: Toner concentration change in dry type developing device 3 is detected by detector 9. When decrease of toner concentration is detected, fresh toner is replenished into developing vessel 3 by rotating toner feed roller 11. When toner concentration in vessel 3 rises above the standard value, the heating amount of heat source R1 of fixing roller 18 is increased through a fixing temperature control circuit by output of detector 9. Otherwise, setting temperature of detector 21 for detecting the surface temperature of rollr 18 is raised. Further, not only heat source R1 or roller 18, but also heat source R2 pressing roller 19 is similarly controlled or pressure of roller 19 is raised.
COPYRIGHT: (C)1979,JPO&Japio
JP552978A 1978-01-20 1978-01-20 Electrophotographic copier Pending JPS5498252A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP552978A JPS5498252A (en) 1978-01-20 1978-01-20 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP552978A JPS5498252A (en) 1978-01-20 1978-01-20 Electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS5498252A true JPS5498252A (en) 1979-08-03

Family

ID=11613709

Family Applications (1)

Application Number Title Priority Date Filing Date
JP552978A Pending JPS5498252A (en) 1978-01-20 1978-01-20 Electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS5498252A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6126071A (en) * 1984-07-17 1986-02-05 Canon Inc Image formation controller
JPH02213888A (en) * 1989-02-15 1990-08-24 Canon Inc Image forming device
US6799000B2 (en) * 2002-08-09 2004-09-28 Nexpress Solutions Llc Roller fuser system with intelligent control of fusing member temperature for printing mixed media types

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6126071A (en) * 1984-07-17 1986-02-05 Canon Inc Image formation controller
JPH02213888A (en) * 1989-02-15 1990-08-24 Canon Inc Image forming device
US6799000B2 (en) * 2002-08-09 2004-09-28 Nexpress Solutions Llc Roller fuser system with intelligent control of fusing member temperature for printing mixed media types

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