GB1398964A - Method of monitoring a toner mix - Google Patents

Method of monitoring a toner mix

Info

Publication number
GB1398964A
GB1398964A GB4098472A GB4098472A GB1398964A GB 1398964 A GB1398964 A GB 1398964A GB 4098472 A GB4098472 A GB 4098472A GB 4098472 A GB4098472 A GB 4098472A GB 1398964 A GB1398964 A GB 1398964A
Authority
GB
United Kingdom
Prior art keywords
toner
brush
replenisher
integrating amplifier
potential
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.)
Expired
Application number
GB4098472A
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of GB1398964A publication Critical patent/GB1398964A/en
Expired 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
    • G03G15/0851—Detection or control means for the developer concentration the concentration being measured by electrical means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

1398964 Developing electrostatic latent images; automatic control of concentration EASTMAN KODAK CO 4 Sept 1972 [ 3 Sept 1971] 40984/72 Headings G2H and G3R The concentration of toner particles in a carrier/toner developer mixture applied to electrostatic latent images on a photo-conductive belt 2 by a magnetic brush 31 is monitored by measuring the potential on the brush when the brush is in contact with charge-free portions of the belt between successive charge-bearing images. A toner replenisher 47 is actuated whenever the potential on the brush, which rises with depletion of toner, exceeds a predetermined value. Preferably the periodically obtained potential values are applied as input pulses to an integrating amplifier 55, and the replenisher is actuated when the accumulated output of the integrating amplifier reaches a threshold value within a time set by a counter 56. If the accumulated output does not reach the threshold within the time set, the counter returns the integrating amplifier and itself to zero, and actuation of the replenisher has the same effect.
GB4098472A 1971-09-03 1972-09-04 Method of monitoring a toner mix Expired GB1398964A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17760071A 1971-09-03 1971-09-03

Publications (1)

Publication Number Publication Date
GB1398964A true GB1398964A (en) 1975-06-25

Family

ID=22649235

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4098472A Expired GB1398964A (en) 1971-09-03 1972-09-04 Method of monitoring a toner mix

Country Status (3)

Country Link
US (1) US3719165A (en)
JP (1) JPS5432573B2 (en)
GB (1) GB1398964A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343548A (en) 1980-05-19 1982-08-10 Xerox Corporation Control system for regulating the concentration of toner particles within a developer mixture

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU467941B2 (en) * 1971-09-25 1975-12-18 Hoechst Aktiengesellschaft Method of and apparatus for measuring or measuring and replacing toner consumed inan electrophotographic reproduction machine
US3869910A (en) * 1973-06-18 1975-03-11 Xerox Corp Diagnostic test device for developer materials
JPS5619637B2 (en) * 1973-06-20 1981-05-08
US3889637A (en) * 1973-06-28 1975-06-17 Xerox Corp Self-biased development electrode and reproducing machine employing same
JPS5346098B2 (en) * 1973-11-27 1978-12-11
US3893408A (en) * 1973-12-26 1975-07-08 Xerox Corp Toner dispensing system
JPS613004Y2 (en) * 1975-01-13 1986-01-30
US4179213A (en) * 1978-04-10 1979-12-18 International Business Machines Corporation Vector pinning in an electrophotographic machine
US4178095A (en) * 1978-04-10 1979-12-11 International Business Machines Corporation Abnormally low reflectance photoconductor sensing system
US4183657A (en) * 1978-04-10 1980-01-15 International Business Machines Corporation Dynamic reference for an image quality control system
US4190018A (en) * 1979-02-02 1980-02-26 Pitney-Bowes, Inc. Powder density control circuit for a photocopier
US4492179A (en) * 1983-06-16 1985-01-08 Xerox Corporation Control system for regulating the dispensing of marking particles in an electrophotographic printing machine
US5150135A (en) * 1990-08-20 1992-09-22 Xerox Corporation Current sensing development control system for an ionographic printing machine
US5189475A (en) * 1991-08-26 1993-02-23 Xerox Corporation Developer mechanism with sensor and notched auger
US8145078B2 (en) * 2008-05-27 2012-03-27 Xerox Corporation Toner concentration system control with state estimators and state feedback methods

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3527651A (en) * 1966-10-20 1970-09-08 Addressograph Multigraph Method of and apparatus for developing electrostatic images
US3399652A (en) * 1967-06-14 1968-09-03 Addressograph Multigraph Automatic toner concentrate detector
US3529546A (en) * 1967-07-12 1970-09-22 Ibm Printing substance control
US3599605A (en) * 1969-03-20 1971-08-17 Ibm Self-biasing development electrode for electrophotography
US3654893A (en) * 1970-05-01 1972-04-11 Eastman Kodak Co Automatic bias control for electrostatic development
US3674532A (en) * 1970-07-23 1972-07-04 Eastman Kodak Co Control for bias of magnetic brush and method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343548A (en) 1980-05-19 1982-08-10 Xerox Corporation Control system for regulating the concentration of toner particles within a developer mixture

Also Published As

Publication number Publication date
JPS4857638A (en) 1973-08-13
US3719165A (en) 1973-03-06
JPS5432573B2 (en) 1979-10-15

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee