US3926338A - Thermally insensitive particle concentration controller - Google Patents

Thermally insensitive particle concentration controller Download PDF

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Publication number
US3926338A
US3926338A US413108A US41310873A US3926338A US 3926338 A US3926338 A US 3926338A US 413108 A US413108 A US 413108A US 41310873 A US41310873 A US 41310873A US 3926338 A US3926338 A US 3926338A
Authority
US
United States
Prior art keywords
operational amplifier
recited
photodiode
circuit means
electrical communication
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 - Lifetime
Application number
US413108A
Other languages
English (en)
Inventor
Noel L Reyner
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Priority to US413108A priority Critical patent/US3926338A/en
Priority to CA206,943A priority patent/CA1039344A/en
Priority to FR7430025A priority patent/FR2250150B1/fr
Priority to NL7413729A priority patent/NL7413729A/xx
Priority to DE2450145A priority patent/DE2450145C3/de
Priority to GB4643474A priority patent/GB1477885A/en
Priority to JP49124829A priority patent/JPS5080143A/ja
Application granted granted Critical
Publication of US3926338A publication Critical patent/US3926338A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
    • G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric 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
    • G03G15/0848—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
    • G03G15/50—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S222/00—Dispensing
    • Y10S222/01—Xerography

Definitions

  • FIG. 6 is an electrical diagram depicting the circuitry of FIGS. 3, 4 and 5 electrically connected to one another.
  • Support material 56 is advanced from a stack thereof.
  • a feed roll in operative communication with a retard roll, advances and separates the uppermost sheet from the stack.
  • the advancing sheet moves into a chute which directs it into the nip between a pair of register rolls.
  • gripper finger mounted on transfer roll 58, secure releasably thereon support material 56 for movement in a recirculating path therewith.
  • the last.processing station in the direction of drum rotation, as indicated by arrow 14, is cleaning station F.
  • a preponderance of the toner particles are transferred to support material 56, residual toner particles remain on photoconductive surface 12 after transfer of the powder image therefrom.
  • These residual toner particles are removed from photoconductive surface 12 as it passes through cleaning station F.
  • the residual toner particles are initially brought under the influence of a cleaning corona generating device (not shown) adapted to neutralize the electrostatic charge remaining on photoconductive surface 12 and the residual toner particles adhering thereto.
  • the neutralized toner particles are then cleaned from photoconductive surface 12 by a rotatably mounted fibrous brush 60 in contact therewith.
  • a suitable brush cleaning device is described in U.S. Pat. No. 3,590,412 issued to Gerbasi in 1971. In this manner, residual toner particles remaining on photoconductive surface 12 are readily removed therefrom.
  • comparator circuit 69 In order to detect the level at which toner particles are to be dispensed into the developer mix, comparator circuit 69 employs operational amplifier 78 wired as a level detector with a slight amount of positive feedback to provide hysteresis about the switch point. Resistor 80 is connected in parallel with operational amplifier 78, and preferably, has a resistance of 50,000 ohms.
  • amplifying circuit means in electrical communication with said photodiode, for stably amplifying the thermally insensitive electrical output signal from said photodiode to at least a preselected level.
  • comparator circuit means in electrical communication with said amplifying circuit means, for comparing the amplified electrical output signal with a preselected reference to produce a control signal corresponding to the deviation between the measured density of particles deposited on said electrode means and the desired density thereof;
  • said amplifying circuit means includes:
  • a first resistance circuit connected in parallel with said first operational amplifier to provide resistive feedback operating in an inverting mode.
  • a second resistance circuit connected in parallel with said second operational amplifier so that said second operational amplifier functions as a level detector with positive feedback about the switch point to provide a hysteresis cycle thereabout.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Dry Development In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Color Electrophotography (AREA)
US413108A 1973-11-05 1973-11-05 Thermally insensitive particle concentration controller Expired - Lifetime US3926338A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US413108A US3926338A (en) 1973-11-05 1973-11-05 Thermally insensitive particle concentration controller
CA206,943A CA1039344A (en) 1973-11-05 1974-08-13 Thermally insensitive particle concentration controller
FR7430025A FR2250150B1 (ja) 1973-11-05 1974-09-04
NL7413729A NL7413729A (nl) 1973-11-05 1974-10-18 Temperatuurongevoelige inrichting voor het regelen van de concentratie deeltjes.
DE2450145A DE2450145C3 (de) 1973-11-05 1974-10-22 Vorrichtung zum Steuern der Tonerkonzentration bei einem elektrophotographischen Kopiergerät
GB4643474A GB1477885A (en) 1973-11-05 1974-10-28 Thermally insensitive particle concentration controller
JP49124829A JPS5080143A (ja) 1973-11-05 1974-10-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US413108A US3926338A (en) 1973-11-05 1973-11-05 Thermally insensitive particle concentration controller

Publications (1)

Publication Number Publication Date
US3926338A true US3926338A (en) 1975-12-16

Family

ID=23635864

Family Applications (1)

Application Number Title Priority Date Filing Date
US413108A Expired - Lifetime US3926338A (en) 1973-11-05 1973-11-05 Thermally insensitive particle concentration controller

Country Status (7)

Country Link
US (1) US3926338A (ja)
JP (1) JPS5080143A (ja)
CA (1) CA1039344A (ja)
DE (1) DE2450145C3 (ja)
FR (1) FR2250150B1 (ja)
GB (1) GB1477885A (ja)
NL (1) NL7413729A (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112870A (en) * 1976-04-26 1978-09-12 Oce-Van Der Grinten N.V. Apparatus for developing electrostatic charge images
US4178095A (en) * 1978-04-10 1979-12-11 International Business Machines Corporation Abnormally low reflectance photoconductor sensing system
US4179213A (en) * 1978-04-10 1979-12-18 International Business Machines Corporation Vector pinning in an electrophotographic machine
US4183657A (en) * 1978-04-10 1980-01-15 International Business Machines Corporation Dynamic reference for an image quality control system
US4372672A (en) * 1980-12-22 1983-02-08 International Business Machines Corporation Self-triggering quality control sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5420742A (en) * 1977-07-15 1979-02-16 Canon Inc Concentration detecting method of developer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376854A (en) * 1966-06-01 1968-04-09 Xerox Corp Automatic toner dispensing control
US3470538A (en) * 1966-12-28 1969-09-30 Allegheny Ludlum Steel Automatic start circuit for computer
US3487978A (en) * 1967-06-14 1970-01-06 Addressograph Multigraph Automatic toner concentrate detector

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399652A (en) * 1967-06-14 1968-09-03 Addressograph Multigraph Automatic toner concentrate detector
BE793425A (fr) * 1971-12-28 1973-06-28 Xerox Corp Procede et dispositif pour regler automatiquement le developpement d'images de couleurs
US3777173A (en) * 1972-02-22 1973-12-04 Dyke Res Van Xerographic toner concentration measuring apparatus and method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3376854A (en) * 1966-06-01 1968-04-09 Xerox Corp Automatic toner dispensing control
US3470538A (en) * 1966-12-28 1969-09-30 Allegheny Ludlum Steel Automatic start circuit for computer
US3487978A (en) * 1967-06-14 1970-01-06 Addressograph Multigraph Automatic toner concentrate detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4112870A (en) * 1976-04-26 1978-09-12 Oce-Van Der Grinten N.V. Apparatus for developing electrostatic charge images
US4178095A (en) * 1978-04-10 1979-12-11 International Business Machines Corporation Abnormally low reflectance photoconductor sensing system
US4179213A (en) * 1978-04-10 1979-12-18 International Business Machines Corporation Vector pinning in an electrophotographic machine
US4183657A (en) * 1978-04-10 1980-01-15 International Business Machines Corporation Dynamic reference for an image quality control system
US4372672A (en) * 1980-12-22 1983-02-08 International Business Machines Corporation Self-triggering quality control sensor

Also Published As

Publication number Publication date
CA1039344A (en) 1978-09-26
JPS5080143A (ja) 1975-06-30
DE2450145B2 (de) 1980-10-23
DE2450145C3 (de) 1981-09-17
DE2450145A1 (de) 1975-05-07
FR2250150B1 (ja) 1977-11-04
GB1477885A (en) 1977-06-29
NL7413729A (nl) 1975-01-31
FR2250150A1 (ja) 1975-05-30

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