JPS6490460A - Method for driving image forming device - Google Patents

Method for driving image forming device

Info

Publication number
JPS6490460A
JPS6490460A JP62248541A JP24854187A JPS6490460A JP S6490460 A JPS6490460 A JP S6490460A JP 62248541 A JP62248541 A JP 62248541A JP 24854187 A JP24854187 A JP 24854187A JP S6490460 A JPS6490460 A JP S6490460A
Authority
JP
Japan
Prior art keywords
toner concentration
toner
developing device
developing
image forming
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
JP62248541A
Other languages
Japanese (ja)
Inventor
Yoshiaki Takano
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.)
Minolta Co Ltd
Original Assignee
Minolta 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 Minolta Co Ltd filed Critical Minolta Co Ltd
Priority to JP62248541A priority Critical patent/JPS6490460A/en
Priority to US07/250,150 priority patent/US4897690A/en
Publication of JPS6490460A publication Critical patent/JPS6490460A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0853—Detection or control means for the developer concentration the concentration being measured by magnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)

Abstract

PURPOSE:To shorten a waiting time and to take many copies in a short time while maintaining image quality by performing switching to use of another developing device which contains toner of the same color when it is decided that toner concentration is smaller than a reference value. CONSTITUTION:Plural developing devices are provided and a developing device 6 is a development type which uses powder consisting of toner and carriers and attachable/detachable to from a copying machine main body. A developing sleeve 61 is arranged rotatably opposite to a photosensitive drum 2 and applied with a developing bias. A toner concentration detection sensor AS2 which detects toner concentration as variation in magnetic permeability is provided on the bottom part of a conveyance path 64 and its sensor surface is fitted so as to be brought into contact with the developer in the conveyance path 64, so that its output signal is outputted to a CPU. The CPU performs the switching to the usage of another developing device when the toner concentration is smaller than the reference value. Consequently, image forming operation is continued.
JP62248541A 1987-09-30 1987-09-30 Method for driving image forming device Pending JPS6490460A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62248541A JPS6490460A (en) 1987-09-30 1987-09-30 Method for driving image forming device
US07/250,150 US4897690A (en) 1987-09-30 1988-09-28 Image forming apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62248541A JPS6490460A (en) 1987-09-30 1987-09-30 Method for driving image forming device

Publications (1)

Publication Number Publication Date
JPS6490460A true JPS6490460A (en) 1989-04-06

Family

ID=17179716

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62248541A Pending JPS6490460A (en) 1987-09-30 1987-09-30 Method for driving image forming device

Country Status (1)

Country Link
JP (1) JPS6490460A (en)

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