US3839992A - Diazo type photosensitive sheet developing device - Google Patents

Diazo type photosensitive sheet developing device Download PDF

Info

Publication number
US3839992A
US3839992A US00225437A US22543772A US3839992A US 3839992 A US3839992 A US 3839992A US 00225437 A US00225437 A US 00225437A US 22543772 A US22543772 A US 22543772A US 3839992 A US3839992 A US 3839992A
Authority
US
United States
Prior art keywords
cylindrical member
guide plate
developing agent
developing
photosensitive sheet
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
US00225437A
Other languages
English (en)
Inventor
Y Takahashi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Application granted granted Critical
Publication of US3839992A publication Critical patent/US3839992A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
    • G03D13/00—Processing apparatus or accessories therefor, not covered by groups G11B3/00 - G11B11/00

Definitions

  • a developing agent comprising iron in powder form moist with a developing liquid, e.g., an organic amine, is tilled in a gap dened between the guide plate and the cylindrical member to provide a magnetic brush which is rotated while exposed binary system photosensitive sheets of the diazo type are introduced into the gap to be developed by means of the magnetic brush cooperating with the guide plate.
  • a developing liquid e.g., an organic amine
  • the photosensitive sheets of the diazo type used in This invention relates to a developing device for b- 5 this invention are of the known type which has a photonary system photosensitive sheets of the diazo type wherein a developing agent comprising iron in powder form moist with an alkaline developing liquid is used for effecting developing by means of a magnetic brush.
  • a developing agent comprising minute powder moist with an alkaline developing liquid, such for example as an organic amine, for developing exposed binary system photosensitive sheets of the diazo type offers many advantages.
  • the duplicates made by using this developing agent are free from odor which tends to render the duplicates made by using ammonia rather objectionable.
  • the developed photosensitive sheets are not discharged from the copying machine in wet condition which is the case when the photosensitive sheets are developed with a liquid developing agent.
  • the use of the developing agent described above permits duplicates of good tone and contrast to be made and provided in dry condition.
  • An object of this invention is to provide a novel diazo type photosensitive sheet developing device wherein a developing agent comprising a ferromagnetic material in minute powder form moist with an alkaline developing liquid is used to provide a magnetic brush on the outer peripheral surface of a cylindrical member by attracting such material to the cylindrical member by magnet means mounted in the interior of the cylindrical member, so that the developing liquid can be supplied by means of such magnetic brush to photosensitive sheets delivered to this developing device after being exposed to an optical image of an original.
  • Another object of the invention is to provide a diazo type photosensitive sheet developing device which facilitates the movement of photosensitive sheets through the device and permits a number of discrete exposed photosensitive sheets to be developed successively and continuously in such manner that not much powder adheres to the surface of each duplicate.
  • This device offers many advantages.
  • the provision of the magnetic brush on the outer peripheral surface of the cylindrical member permits as many exposed photosensitive sheets as desired to be developed successively and continuously.
  • the movement of the photosensitive sheets through the developing device is facilitated, and little powder adheres to the surface of each developed sheet.
  • the magnet means mounting shaft disposed in the cylindrical member can be removed therefrom, the batch of developing agent disposed on the outer peripheral surface of the cylindrical member can be replaced by a new batch.
  • Last not but least important is the fact that since various parts of the developing device are disposed conveniently about the cylindrical member, it is possible to obtain a compact overall size in a developing device.
  • the drawing is a sectional view of the diazo type photosensitive sheet developing device comprising one embodiment of this invention.
  • an alkaline developing liquid such for example as monoethanol amine or other organic amine
  • a ferrogmagnetic material in minute powder form such for example, example iron, cobalt, nickel or an alloy thereof, an alloy of one of such metals with other suitable metal, or an alloy comprising manganese and copper, is used as a carrier for the alkaline developing liquid.
  • a cylindrical member used in this device for housing magnet means therein is preferably made of a non-magnetic material, such for example as aluminum, an aluminum alloy or a synthetic resinous material.
  • a developing agent l comprising a ferromagnetic material in minute powder form moist with an alkaline developing liquid is contained in a vessel 2 in which is rotatably mounted a cylindrical member 3 of relatively large diameter made of a nonmagnetic material.
  • a shaft 4 mounted axially in cylindrical member 3 is hexagonal in cross-section, and a magnet supporter 5 is attached to every other side of shaft 5.
  • Diverging two arms of each magnet supporter 5 each carry thereon a permanent magnet 6 mounted with a north pole being disposed adjacent an inner peripheral surface of cylindrical member 3. It is to be understood that this invention is not limited to the method of mounting the magnet means described herein and that the magnet means may be mounted in any other suitable manner.
  • the positions of the poles of each permanent magnet may be conveniently changed, and electromagnets may be used in place of permanent magnets as the magnetic means.
  • Cylindrical member 3 and shaft 4 are driven by suitable motors 3a and 4a to rotate in the direction of an arrow a, with magnets 6 rotating about the axis of shaft 4.
  • Each magnet 6 attracts developing agent l to an outer peripheral surface of cylindrical member 3 when it draws near container 2, so that a magnetic brush 7 is formed along the lines of magnetic force of the magnet means.
  • a photosensitive sheet guide plate 8 is mounted above a left upper half portion of cylindrical member 3 as shown in the FIGURE to be disposed along a portion of the outer peripheral surface thereof. Defined between guide plate 8 and the outer peripheral surface of cylindrical member 3 is a gap which is of dimension such that magnetic brush 7 disposed in the gap is maintained in engagement with an inner surface of guide plate 8.
  • a pair of rollers 9 for introducing photosensitive sheets into the gap is mounted at an entrance to the gap or at a lower end of guide plate 8 in a left lower portion of the FIGURE.
  • Binary system photosensitive sheets of the diazo type are moved in the direction of an arrow b and delivered to the pair of rollers 9 by another guide plate l0 after being exposed to an optical image of an original.
  • Each photosensitive sheet is gripped by the pair of rollers 9 and introduced into the gap between guide plate 8 and cylindrical member 3 with its photosensitive layer facing the outer peripheral surface of cylindrical member 3.
  • the magnetic brush 7 on cylindrical member 3 is adapted to rotate at a rate greater than the rate at which each photosensitive sheet moves in the gap between guide plate 8 and cylindrical member 3. As a result, the magnetic brush rubs against the photosensitive layer ofeach photosensitive sheet which receives a supply ofthe alkaline developing liquid so that the exposed photosensitive sheet is developed.
  • Cylindrical member 3 and the shaft l supporting magnets 6 may rotate as a unit or may rotate separately at different rates of revolutions. Cylindrical member 3 may be firmly fixed without rotating if desired. However, cylindrical member 3 is preferably rotated so as to permit each photosensitive sheet to move through the gap between guide plate 8 and cylindrical member 3 smoothly. The inner surface of guide plate 8 is preferably finished to provide a smooth planar surface.
  • the smooth inner surface of guide plate 8 cooperates with the rotating magnetic brush to permit photosensitive sheets of minumum thickness to move through the gap between guide plate 8 and cylindrical member 3 without trouble ⁇
  • a thin sheet 2a as of polyester is attached to an upper edge of vessel 2 disposed on the guide plate side and mounted along the path of movement of photosensitive sheets so as to keep the developing agent from falling downwardly between the upper edge of vessel 2 and the inner surface of guide plate 8.
  • a pair of rollers lll and l2 maintained in pressing engagement against each other is mounted at an exit of the gap or at an upper end of guide plate 8.
  • a combined photosensitive sheet stripper and guide l consisting of a number of sheets of a synthetic resinous material is supported by upper and lower support shafts 13 and 14 and disposed adjacent one roller l2.
  • Combined stripper and guide l5 has a plurality of pawls 15a (only one is visible in the drawing) maintained lightly in pressing engagement with the outer peripheral surface of cylindrical member 3, so that they can engage the leading end of each photosensitive sheet moving toward the exit of the gap after being developed to strip the photosensitive sheet off the cylindrical surface and direct the same toward two rollers lll and l2.
  • the developed photosensitive sheet gripped by two rollers lll and l2 is delivered to a pair of cleaning cylinders 16 and l7 rotating in a direction opposite to the direction of movement of the developed photosensitive sheet.
  • Permanent magnets t8 and E9 are housed in cleaning cylinders ll6 and ll7 respectively, so that the minute powder of the developing agent adhered to the surface of the developed photosensitive sheet can be removed therefrom by being attracted to outerperipheral surfaces of two cleaning cylinders 16 and 17.
  • Scrape-off plates 20 and 2li are mounted such that their forward ends are maintained in pressing engagement with outer peripheral surfaces of cleaning cylinders 16 and i7 respectively to scrape off the powder attached to the developed photosensitive sheet.
  • Scrape-ol plates 20 and 2l are preferably made of metal or other resilient material and secured to fixed shafts 22 and 23 at their bases.
  • a diazo type photosensitive sheet developing device comprising a vessel for a developing agent including powdered magnetic material moistened with developing fluid, a cylindrical member mounted for rotation about its axis and partly immersed in said vessel to contact the developing agent contained therein, magnet means mounted for coaxial rotation inside the cylindrical member for attracting developing agent to form a brush of developing agent adhering magnetically to the outer periphery of the cylindrical member, a photosensitive sheet guide plate mounted along a segment of the outer periphery ofthe cylindrical member and spaced apart therefrom to form a gap, said magnet means comprising a plurality of magnets circumferentially spaced from each other by sufficient distances to form said brush in the shape of a plurality of ridges of powdered magnetic material moistened with developing fluid, each ridge facing the guide plate, extending axially and having a peak contacting said guide plate, each pair of adjacent peaks that contact the guide plate being separated by a valley having a bottom extending away from the guide plate by a substantial distance as compared to the
  • a developing device as in claim ll including means for extracting photosensitive sheets introduced into the gap between the cylindrical member and the photosensitive sheet guide plate and means for removing developing agent adhering to the sheets extracted by said extracting means.
  • a developing device as in claim 3 wherein said developing agent removing means comprises a pair of cleaning cylinders mounted parallel to and abutting each other, means for passing between said cleaning cylinders sheets extracted by said extracting means, and magnetic means mounted in said cleaning cylinders to attract to the outer periphery of the cleaning cylinders developing agent adhering to the sheets passing between the cleaning cylinders.
  • a diazo type photosensitive sheet developing device comprising a vessel for a developing agent including powdered magnetic material moistened with developing fluids, a cylindrical member mounted for rotation about its axis and partly immersed in said vessel to contact the developing agent contained therein, magnet means mounted for coaxial rotation inside the cylindrical member for attracting developing agent to form a brush of developing agent adhering magnetically to the out periphery of the cylindrical member, a photosensitive sheet guide plate mounted along a segment ofthe outer periphery of the cylindrical member and spaced apart therefrom to form a gap, means for rotating the cylindrical member and the magnet means ⁇ means for introducing an exposed diazo type photosensitive sheet in the gap between the cylindrical member and the photosensitive sheet guide plate, means for extracting photosensitive sheets introduced into the gap between the cylindrical member and the photosensitive sheet guide plate and means for removing developing agent adhering to the sheets extracted by the extracting means, wherein said developing agent removing means comprise a pair of cleaning cylinders mounted parallel to and abutting each other, means for passing between said cleaning cylinders

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
US00225437A 1971-02-13 1972-02-11 Diazo type photosensitive sheet developing device Expired - Lifetime US3839992A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1971007885U JPS475648U (enrdf_load_stackoverflow) 1971-02-13 1971-02-13

Publications (1)

Publication Number Publication Date
US3839992A true US3839992A (en) 1974-10-08

Family

ID=11678038

Family Applications (1)

Application Number Title Priority Date Filing Date
US00225437A Expired - Lifetime US3839992A (en) 1971-02-13 1972-02-11 Diazo type photosensitive sheet developing device

Country Status (3)

Country Link
US (1) US3839992A (enrdf_load_stackoverflow)
JP (1) JPS475648U (enrdf_load_stackoverflow)
GB (1) GB1380102A (enrdf_load_stackoverflow)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937181A (en) * 1973-05-23 1976-02-10 Fuji Xerox Co., Ltd. Magnetic brush type developing mechanism in electrophotographic copying machine
US3945343A (en) * 1975-03-24 1976-03-23 General Electric Company Magnetic brush for use in magnetic printing
US3952701A (en) * 1974-11-05 1976-04-27 Hitachi Metals, Ltd. Electrostatic developing apparatus
US4002145A (en) * 1973-08-16 1977-01-11 Develop Kg/Dr. Eisbein And Co. Apparatus for applying and fixing a magnetizable powder on a charged sheet
US4003334A (en) * 1975-11-11 1977-01-18 Speed-O-Print Business Machines Corporation Developer roller for electrostatic copier
US4081571A (en) * 1974-08-01 1978-03-28 Mita Industrial Co. Ltd. Method for developing electrostatic latent images
US4102306A (en) * 1976-05-31 1978-07-25 Konishiroku Photo Industry Co., Ltd. Developing roller and rinsing device
US4126100A (en) * 1974-08-01 1978-11-21 Mita Industrial Company Ltd. Apparatus for causing a developer powder to make an irregular motion in a developing zone
US4136637A (en) * 1977-03-09 1979-01-30 Xerox Corporation Continuous contrast development system
JPS5446556A (en) * 1977-09-20 1979-04-12 Ricoh Co Ltd Electrostatic latent image development
EP0003134A1 (en) * 1978-01-11 1979-07-25 Ricoh Company, Ltd Magnetic brush development apparatus
DE3402864A1 (de) * 1983-01-29 1984-08-02 Ricoh Co., Ltd., Tokio/Tokyo Magnetrolle und verfahren zum herstellen einer magnetrolle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5024238U (enrdf_load_stackoverflow) * 1973-06-26 1975-03-19
JPS6094983U (ja) * 1983-11-30 1985-06-28 ぺんてる株式会社 インキカ−トリツジ

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015305A (en) * 1958-05-23 1962-01-02 Xerox Corp Development of electrostatic images
US3145122A (en) * 1962-08-13 1964-08-18 Addressograph Multigraph Apparatus for applying developer powder to photo-conductive insulating material
US3152924A (en) * 1961-05-24 1964-10-13 Robertson Photo Mechanix Inc Xerographic brush
US3176652A (en) * 1960-09-26 1965-04-06 Xerox Corp Xerographic developing apparatus
US3387586A (en) * 1966-06-06 1968-06-11 Addressograph Multigraph Magnetic developer apparatus
US3457900A (en) * 1968-02-29 1969-07-29 Eastman Kodak Co Single magnetic brush apparatus for development of electrostatic images
US3547077A (en) * 1963-07-17 1970-12-15 Olivetti & Co Spa Electrostatic printing apparatus
US3580673A (en) * 1968-08-26 1971-05-25 Xerox Corp Cleaning apparatus
US3592675A (en) * 1967-10-09 1971-07-13 Azoplate Corp Method for developing latent electrostatic images
US3640248A (en) * 1969-06-04 1972-02-08 Xerox Corp Electrostatic magnetic developing apparatus
US3643629A (en) * 1969-10-20 1972-02-22 Minnesota Mining & Mfg Magnetic powder applicator
US3645770A (en) * 1968-04-22 1972-02-29 Xerox Corp Improved method for developing xerographic images

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3015305A (en) * 1958-05-23 1962-01-02 Xerox Corp Development of electrostatic images
US3176652A (en) * 1960-09-26 1965-04-06 Xerox Corp Xerographic developing apparatus
US3152924A (en) * 1961-05-24 1964-10-13 Robertson Photo Mechanix Inc Xerographic brush
US3145122A (en) * 1962-08-13 1964-08-18 Addressograph Multigraph Apparatus for applying developer powder to photo-conductive insulating material
US3547077A (en) * 1963-07-17 1970-12-15 Olivetti & Co Spa Electrostatic printing apparatus
US3387586A (en) * 1966-06-06 1968-06-11 Addressograph Multigraph Magnetic developer apparatus
US3592675A (en) * 1967-10-09 1971-07-13 Azoplate Corp Method for developing latent electrostatic images
US3457900A (en) * 1968-02-29 1969-07-29 Eastman Kodak Co Single magnetic brush apparatus for development of electrostatic images
US3645770A (en) * 1968-04-22 1972-02-29 Xerox Corp Improved method for developing xerographic images
US3580673A (en) * 1968-08-26 1971-05-25 Xerox Corp Cleaning apparatus
US3640248A (en) * 1969-06-04 1972-02-08 Xerox Corp Electrostatic magnetic developing apparatus
US3643629A (en) * 1969-10-20 1972-02-22 Minnesota Mining & Mfg Magnetic powder applicator

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3937181A (en) * 1973-05-23 1976-02-10 Fuji Xerox Co., Ltd. Magnetic brush type developing mechanism in electrophotographic copying machine
US4002145A (en) * 1973-08-16 1977-01-11 Develop Kg/Dr. Eisbein And Co. Apparatus for applying and fixing a magnetizable powder on a charged sheet
US4081571A (en) * 1974-08-01 1978-03-28 Mita Industrial Co. Ltd. Method for developing electrostatic latent images
US4126100A (en) * 1974-08-01 1978-11-21 Mita Industrial Company Ltd. Apparatus for causing a developer powder to make an irregular motion in a developing zone
US3952701A (en) * 1974-11-05 1976-04-27 Hitachi Metals, Ltd. Electrostatic developing apparatus
US3945343A (en) * 1975-03-24 1976-03-23 General Electric Company Magnetic brush for use in magnetic printing
US4003334A (en) * 1975-11-11 1977-01-18 Speed-O-Print Business Machines Corporation Developer roller for electrostatic copier
US4102306A (en) * 1976-05-31 1978-07-25 Konishiroku Photo Industry Co., Ltd. Developing roller and rinsing device
US4136637A (en) * 1977-03-09 1979-01-30 Xerox Corporation Continuous contrast development system
JPS5446556A (en) * 1977-09-20 1979-04-12 Ricoh Co Ltd Electrostatic latent image development
EP0003134A1 (en) * 1978-01-11 1979-07-25 Ricoh Company, Ltd Magnetic brush development apparatus
DE3402864A1 (de) * 1983-01-29 1984-08-02 Ricoh Co., Ltd., Tokio/Tokyo Magnetrolle und verfahren zum herstellen einer magnetrolle

Also Published As

Publication number Publication date
DE2206909B2 (de) 1976-09-16
JPS475648U (enrdf_load_stackoverflow) 1972-09-19
GB1380102A (en) 1975-01-08
DE2206909A1 (de) 1972-08-24

Similar Documents

Publication Publication Date Title
US3839992A (en) Diazo type photosensitive sheet developing device
US3580673A (en) Cleaning apparatus
US3739749A (en) Magnetic powder applicator
US3152924A (en) Xerographic brush
US3643629A (en) Magnetic powder applicator
US3900001A (en) Developing apparatus
US3828730A (en) Electrostatic record developing apparatus
US3246629A (en) Apparatus for developing electrostatic images
US4041903A (en) Developing device for use in electrophotography
US4086006A (en) Purging system for a development apparatus
US3816799A (en) Electrostatic charge elimination for magnetic printing system
US4008686A (en) Developing device for use in electrophotography
US3906121A (en) Electrostatic development method using magnetic brush configuration transport
US4868607A (en) Electrophotographic device with a bead pickoff arrangement
US4676191A (en) Development device
US3849161A (en) Magnetic toner powder applicator
JPS5814675B2 (ja) 潜在的な磁気的画像を含む表面にトナ−粒子を塗布する方法
US4082061A (en) Multi-color development system
GB2094672A (en) Developing electrostatic latent images
USRE28566E (en) Cleaning apparatus
US4267796A (en) Apparatus for developing electrostatic latent image
US4972231A (en) Linearly movable developer unit magnet
JP3015417U (ja) 印刷ロールのインク付着装置
JPS5815791B2 (ja) デンシフクシヤキニオケルゲンゾウソウチ
US3893815A (en) Magnetic brush support member