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GB1393698A - Method of and apparatus for measuring or measuring and controlling the toner concentration in electrophotographic reproduction machines - Google Patents

Method of and apparatus for measuring or measuring and controlling the toner concentration in electrophotographic reproduction machines

Info

Publication number
GB1393698A
GB1393698A GB3542672A GB3542672A GB1393698A GB 1393698 A GB1393698 A GB 1393698A GB 3542672 A GB3542672 A GB 3542672A GB 3542672 A GB3542672 A GB 3542672A GB 1393698 A GB1393698 A GB 1393698A
Authority
GB
United Kingdom
Prior art keywords
toner
developer
sample
measuring
radiation
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
GB3542672A
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.)
Hoechst AG
Original Assignee
Hoechst AG
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
Priority claimed from DE2138105A external-priority patent/DE2138105A1/en
Priority claimed from DE2226924A external-priority patent/DE2226924A1/en
Priority claimed from DE2226923A external-priority patent/DE2226923A1/en
Application filed by Hoechst AG filed Critical Hoechst AG
Publication of GB1393698A publication Critical patent/GB1393698A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/12—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the material being a flowing fluid or a flowing granular solid
    • 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
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
    • 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
    • G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
    • G03G15/0891—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Dry Development In Electrophotography (AREA)

Abstract

1393698 Electro-photographic copying apparatus HOECHST AG 28 July 1972 [30 July 1971 2 June 1972(2)] 35426/72 Heading G2H A method of measuring or measuring and controlling the toner concentration of a developer circulating in an electro-photographic reproduction machine comprises preparing from the circulating developer a sample for measurement the sample being either the developer itself or a material composed of or enriched in the toner component of the developer. The sample is so arranged that the toner therein can be estimated as a proportion of the required toner concentration of the developer. In a measurement step the sample is irradiated by radio-active radiation that is affected by the toner in a manner measurable for estimation of the toner present. The effect of the sample on the radiation is measured and, in any subsequent controlling step, based on the measurement a quantity of further toner is added to the developer to raise the measured toner content to the required value. As shown in Fig. 1 the zone where developer collects in the cascade apparatus there is located on a holder 15 a radio-active preparation 16, radiation from which is reduced in strength by the collected developer material 8 and by the wall of the hopper which is thin at this point; the radiation then strikes a detector 18, and the arrangement is such that signals from this detector control the supply of toner. The reduction in the strength of the radiation depends upon the concentration of toner in the developer material.
GB3542672A 1971-07-30 1972-07-28 Method of and apparatus for measuring or measuring and controlling the toner concentration in electrophotographic reproduction machines Expired GB1393698A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE2138105A DE2138105A1 (en) 1971-07-30 1971-07-30 METHOD AND DEVICE FOR MEASURING AND, IF NECESSARY, REGULATING THE TONER CONCENTRATION IN ELECTROPHOTOGRAPHIC REPRODUCTION MACHINES
DE2226924A DE2226924A1 (en) 1972-06-02 1972-06-02 METHOD AND DEVICE FOR MEASURING AND CONTROLLING THE TONER CONCENTRATION IN ELECTROPHOTOGRAPHIC REPRODUCTION MACHINES
DE2226923A DE2226923A1 (en) 1972-06-02 1972-06-02 Electrophotographic copying - in which the toner concn is automatically adjusted

Publications (1)

Publication Number Publication Date
GB1393698A true GB1393698A (en) 1975-05-14

Family

ID=27183597

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3542672A Expired GB1393698A (en) 1971-07-30 1972-07-28 Method of and apparatus for measuring or measuring and controlling the toner concentration in electrophotographic reproduction machines

Country Status (4)

Country Link
JP (1) JPS4829447A (en)
FR (1) FR2149140A5 (en)
GB (1) GB1393698A (en)
NL (1) NL7210040A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1022391B (en) * 1973-10-01 1978-03-20 Franks Harry E SPARK PLUG FOR ENGINES
JPS5445433A (en) * 1977-09-16 1979-04-10 Ngk Spark Plug Co Ltd Alloy for spark plug electrode
US5139891A (en) * 1991-07-01 1992-08-18 Olin Corporation Palladium alloys having utility in electrical applications
US5236789A (en) * 1991-07-01 1993-08-17 Olin Corporation Palladium alloys having utility in electrical applications

Also Published As

Publication number Publication date
FR2149140A5 (en) 1973-03-23
NL7210040A (en) 1973-02-01
JPS4829447A (en) 1973-04-19

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees