US3336904A - Xerographic developing apparatus - Google Patents

Xerographic developing apparatus Download PDF

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Publication number
US3336904A
US3336904A US388120A US38812064A US3336904A US 3336904 A US3336904 A US 3336904A US 388120 A US388120 A US 388120A US 38812064 A US38812064 A US 38812064A US 3336904 A US3336904 A US 3336904A
Authority
US
United States
Prior art keywords
developer
hopper
sensitive material
gas
toner
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
US388120A
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English (en)
Inventor
Obuchi Kazuo
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 Holdings Corp
Original Assignee
Fuji Photo Film 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 Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Application granted granted Critical
Publication of US3336904A publication Critical patent/US3336904A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • a xerographic developing apparatus including a hopper supplying developer to a latent image bearing material in a cascade fashion, with at least one gas jet nozzle positioned above the material and below the hopper. The gas stream flowing from the nozzle thereby rolls the developer over the image surface of the material and allows toner in the developer to transfer to the latent image.
  • the present invention relates to a xerographic developing apparatus wherein feeding of a developer is performed by a gas flow.
  • any developer commonly used at present may flow smoothly on the sensitive surface, an inclination thereof in an angle of more than twenty degrees is required, the degree of the inclination depends on the shape and size of the developer as used. In other words the inclination less than twenty degrees disturbs the free flowing of developer and consequently satisfactory development cannot be obtained
  • some external force rather than the force of gravity is required. For instance, carrier in developer is made of magnetic material, then the magnetic force is used for flowing the developer.
  • the essential feature of the present invention resides in that the feeding of developer to the sensitive material is performed by means of the force due to the gas or gases flow.
  • FIG. 1 is a perspective view of the embodiment according to the present invention with one part thereof broken down, showing the principle of the present invention.
  • FIG. 2 is a sectional view of the embodiment as shown in FIG. 1.
  • 1 indicates the xerographic sensitive material, this material with the sensitive surface upsided travelling in the direction indicated by arrow 2.
  • a duct 3 which has an opening only at the bottom is installed perpendicular to the travelling direction of the sensitive material 1. Narrow gaps are left between the side walls of the duct 3 and the surface of the sensitive material so that the movement of the sensitive material may not be disturbed.
  • a hopper for supplying developer 4 and gas jet nozzles 5, 6 and 7. Developer is supplied from the hopper 4 onto the surface of the sensitive material 1.
  • the hopper may be shaped so as to give developer the initial tangential velocity. Developer, in general, cannot continue flowing against friction and therefore, it stops after flowing a certain distance.
  • gas supplying tubes 8, 9 and 10 Being supplied at a constant pressure from gas supplying tubes 8, 9 and 10 to gas jet nozzles 5, 6 and 7, gas flows in the direction perpendicular to the travelling direction of the sensitive material 1, thereby causing developer to continue flowing smoothly on the sensitive material so that satisfactory developing may be performed.
  • the flowing direction of developer may be selected within the range from right angles to parallel to the travelling direction of the sensitive material, if required in designing.
  • the developer departs from the enclosure of the duct 3, the developer will not be influenced by the gas blown off from the nozzles 5, 6 and 7, so it can not continue to flow and is taken off with the sensitive material, so resulting in irregularity in development.
  • the gas flow has no irregular component therein. It is also desirable to give the gas flow the component cancelling the component in the travelling direction of the sensitive material.
  • guide blades are provided within the duct and the nozzle.
  • the nozzles and the guide blades are arranged with a slight gradient in the opposite direction to the travelling direction of the sensitive material.
  • gas jet nozzles 12 are provided on the side walls of the duct 3. Then, the air blowing in the direction indicated by arrow 13 prevents the departure of developer from the interior of the duct.
  • developer can flow smoothly and in the case the gas flow which wind pressure does not cause carrier and toner to separate from each other is applied the outcome of development is similar to that obtained according to the so-called cascade developing process.
  • toner will separate from carrier to suspend in the gas flow, resulting in the development similar to that obtained according to the so-called powder cloud developing process. Both of them, accordingly, fall within the scope of the present.
  • a xerographic developing apparatus comprising a hopper which is adapted to supply a developer consisting of a toner and a carrier to a latent image bearing material in a cascade fashion, and at least one gas jet nozzle positioned above said material and below said hopper, thereby allowing the gas stream flowing from said nozzle to roll the developer over the image surface of said material and allowing the toner to transfer to the latent image.
  • An apparatus for developing a xerographic sensitive material bearing a latent image comprising means to advance said material along a fixed path, hopper means disposed above said path and adapted to supply a developer consisting of a toner and a carrier to said material in a cascade fashion, and at least one gas jet nozzle positioned above said path and below said hopper and adapted to emit a gas stream toward said material to roll the developer over the image surface of said material and to allow the toner to transfer to the latent image.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Developing Agents For Electrophotography (AREA)
  • Air Transport Of Granular Materials (AREA)
US388120A 1963-08-13 1964-08-07 Xerographic developing apparatus Expired - Lifetime US3336904A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4279463 1963-08-13

Publications (1)

Publication Number Publication Date
US3336904A true US3336904A (en) 1967-08-22

Family

ID=12645854

Family Applications (1)

Application Number Title Priority Date Filing Date
US388120A Expired - Lifetime US3336904A (en) 1963-08-13 1964-08-07 Xerographic developing apparatus

Country Status (5)

Country Link
US (1) US3336904A (is")
BE (1) BE651786A (is")
DE (1) DE1472946B2 (is")
GB (1) GB1068575A (is")
NL (1) NL6409217A (is")

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168901A (en) * 1975-01-21 1979-09-25 Canon Kabushiki Kaisha Developer housing sealing device for electrophotography
US4522488A (en) * 1983-12-21 1985-06-11 Xerox Corporation Cleaning apparatus for a magnetographic printing device
US4616919A (en) * 1985-09-05 1986-10-14 International Business Machines Corporation Non-contact developer seal

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1797613C2 (de) * 1965-03-01 1980-06-26 Rank Xerox Ltd., London Vorrichtung zum Entwickeln elektrostatischer Ladungsbilder

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872338A (en) * 1955-04-18 1959-02-03 Haloid Xerox Inc Electrophotographic developing process
US2932278A (en) * 1955-05-03 1960-04-12 Sperry Rand Corp Single print magnetic printer
US3114482A (en) * 1962-04-30 1963-12-17 Ralph H Dunaway Apparatus for dispensing dry powdered material
US3124483A (en) * 1958-05-12 1964-03-10 Apparatus for transferring powder images and method therefor
US3277493A (en) * 1962-02-13 1966-10-04 Norman F Fyler Electrostatic reproduction techniques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872338A (en) * 1955-04-18 1959-02-03 Haloid Xerox Inc Electrophotographic developing process
US2932278A (en) * 1955-05-03 1960-04-12 Sperry Rand Corp Single print magnetic printer
US3124483A (en) * 1958-05-12 1964-03-10 Apparatus for transferring powder images and method therefor
US3277493A (en) * 1962-02-13 1966-10-04 Norman F Fyler Electrostatic reproduction techniques
US3114482A (en) * 1962-04-30 1963-12-17 Ralph H Dunaway Apparatus for dispensing dry powdered material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4168901A (en) * 1975-01-21 1979-09-25 Canon Kabushiki Kaisha Developer housing sealing device for electrophotography
US4522488A (en) * 1983-12-21 1985-06-11 Xerox Corporation Cleaning apparatus for a magnetographic printing device
US4616919A (en) * 1985-09-05 1986-10-14 International Business Machines Corporation Non-contact developer seal

Also Published As

Publication number Publication date
DE1472946A1 (de) 1969-05-08
NL6409217A (is") 1964-12-28
DE1472946B2 (de) 1970-12-03
BE651786A (is")
GB1068575A (en) 1967-05-10

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