JPS57188074A - Toner density adjusting device for copying machine - Google Patents

Toner density adjusting device for copying machine

Info

Publication number
JPS57188074A
JPS57188074A JP56072695A JP7269581A JPS57188074A JP S57188074 A JPS57188074 A JP S57188074A JP 56072695 A JP56072695 A JP 56072695A JP 7269581 A JP7269581 A JP 7269581A JP S57188074 A JPS57188074 A JP S57188074A
Authority
JP
Japan
Prior art keywords
maximum
minimum
toner
detecting circuits
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.)
Granted
Application number
JP56072695A
Other languages
Japanese (ja)
Other versions
JPH0373866B2 (en
Inventor
Yukio Kanazawa
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.)
Fujifilm Business Innovation Corp
Original Assignee
Fuji Xerox 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 Fuji Xerox Co Ltd filed Critical Fuji Xerox Co Ltd
Priority to JP56072695A priority Critical patent/JPS57188074A/en
Publication of JPS57188074A publication Critical patent/JPS57188074A/en
Publication of JPH0373866B2 publication Critical patent/JPH0373866B2/ja
Granted 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
    • 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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To obtin copies of a desired image density, by adding detecting circuits, by which allowable maximum and minimum toner densities of a developing device are obtained, besides an image density detecting circuit and making these detecting circuits operatable only in the copy preparation state. CONSTITUTION:Maximum and minimum density detecting circuits 27 and 28 are added to obtain allowable maximum and minimum toner densities of a developing device. These maximum and minimum density detecting circuits 27 and 28 are provided with comparators 30 and 32, which receive the image density signal from an amplifier 20 and compare this signal with reference levels Rf(max) and Rf(min) corresponding to maximum and minimum toner densities, and drivers 31 and 33 which receive outputs of comparators to drive a toner feed motor M1. These maximum and minimum density detecting circuits 27 and 28 are not operated unless toner increasing and toner reducing commands are issued, and these commands are generated only when the developing device is ready.
JP56072695A 1981-05-14 1981-05-14 Toner density adjusting device for copying machine Granted JPS57188074A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56072695A JPS57188074A (en) 1981-05-14 1981-05-14 Toner density adjusting device for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56072695A JPS57188074A (en) 1981-05-14 1981-05-14 Toner density adjusting device for copying machine

Publications (2)

Publication Number Publication Date
JPS57188074A true JPS57188074A (en) 1982-11-18
JPH0373866B2 JPH0373866B2 (en) 1991-11-25

Family

ID=13496755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56072695A Granted JPS57188074A (en) 1981-05-14 1981-05-14 Toner density adjusting device for copying machine

Country Status (1)

Country Link
JP (1) JPS57188074A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59104677A (en) * 1982-12-07 1984-06-16 Fujitsu Ltd Dry type electronic printer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54111834A (en) * 1978-02-22 1979-09-01 Toshiba Corp Density control device of copying machine
JPS5622445A (en) * 1979-07-31 1981-03-03 Canon Inc Image forming unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54111834A (en) * 1978-02-22 1979-09-01 Toshiba Corp Density control device of copying machine
JPS5622445A (en) * 1979-07-31 1981-03-03 Canon Inc Image forming unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59104677A (en) * 1982-12-07 1984-06-16 Fujitsu Ltd Dry type electronic printer

Also Published As

Publication number Publication date
JPH0373866B2 (en) 1991-11-25

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