JPS6490459A - Method for driving image forming device - Google Patents

Method for driving image forming device

Info

Publication number
JPS6490459A
JPS6490459A JP62248543A JP24854387A JPS6490459A JP S6490459 A JPS6490459 A JP S6490459A JP 62248543 A JP62248543 A JP 62248543A JP 24854387 A JP24854387 A JP 24854387A JP S6490459 A JPS6490459 A JP S6490459A
Authority
JP
Japan
Prior art keywords
toner
reference value
toner concentration
smaller
developing device
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
JP62248543A
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 JP62248543A priority Critical patent/JPS6490459A/en
Priority to US07/250,150 priority patent/US4897690A/en
Publication of JPS6490459A publication Critical patent/JPS6490459A/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 maintain a proper image of the same color by performing switching only when the toner concentration of another developing device is larger than a reference value if it is decided that toner concentration is smaller than the reference value, and replenishing toner when the toner concentration is smaller than the reference value. CONSTITUTION:Plural developing devices are provided and a developing device is a type which uses powder consisting of toner and carriers and attachable/ detachable to from a copying machine main body. The toner concentration is detected by a toner concentration detection sensor as variation in magnetic permeability and outputted to a CPU. The CPU performs switching to the use of another developing device when the toner concentration is smaller than the reference value. When the toner concentration is smaller than the reference value, a bracket 80 is provided on one end part of the developing device 5 and a toner replenishing bottle 81 for replenishing toner is mounted freely detachably on the bracket 80 and replenishes the toner while rotating by a supply motor. Further, a bottle presence/absence detection sensor 82 and a toner empty detection sensor 83 which detects whether or not there is toner are provided additionally in the vicinity of the bottle 81.
JP62248543A 1987-09-30 1987-09-30 Method for driving image forming device Pending JPS6490459A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP62248543A JPS6490459A (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
JP62248543A JPS6490459A (en) 1987-09-30 1987-09-30 Method for driving image forming device

Publications (1)

Publication Number Publication Date
JPS6490459A true JPS6490459A (en) 1989-04-06

Family

ID=17179745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62248543A Pending JPS6490459A (en) 1987-09-30 1987-09-30 Method for driving image forming device

Country Status (1)

Country Link
JP (1) JPS6490459A (en)

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