US3659311A - Magnetic powder scavenging arrangement - Google Patents

Magnetic powder scavenging arrangement Download PDF

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Publication number
US3659311A
US3659311A US30730A US3659311DA US3659311A US 3659311 A US3659311 A US 3659311A US 30730 A US30730 A US 30730A US 3659311D A US3659311D A US 3659311DA US 3659311 A US3659311 A US 3659311A
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US
United States
Prior art keywords
powder
nonmagnetic
rotor
drum
magnetic
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
US30730A
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English (en)
Inventor
Frank Arthur Oakley Waren
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.)
Creed and Co Ltd
Original Assignee
Creed and 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 Creed and Co Ltd filed Critical Creed and Co Ltd
Application granted granted Critical
Publication of US3659311A publication Critical patent/US3659311A/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G19/00—Processes using magnetic patterns; Apparatus therefor, i.e. magnetography

Definitions

  • ABSTRACT A device for scavenging magnetizable powder from e. g. a I 30] Foreign Apphcauon Priority Data drum in a printing apparatus.
  • the powder is attracted from the M y 1969 Great Britain drum to the surface of a nonmagnetic tube positioned parallel to the drum, which has contained therein a rotatable set of ad- Cl /2565, 1185371209315 jacent bar magnets,
  • the rotation of the magnets causes, via f 13/41 2 19/00 the bar magnets divergent magnetic flux field, the attracted [58] Field of Search ..l98/41; 118/639, 637 L0, 623, powder to work its way around the surface of the tube in 1 637; 1 17/38; 146/74 1 3 posite direction to the magnet rotation and onto a ledge exten- [OI/DIG 33 /288 32 2; sion ofthe tube surface.
  • SHEET 2 [IF 2 I lnvenlor FRANK ARTHUR OAKLEY WARE/V Agent MAGNETIC POWDER SCAVENGING BACKGROUND OF THE INVENTION
  • This invention relates to magnetic printing and/or display devices, and in particular to magnetic powder scavenging apparatus therefor.
  • Such magnetic devices are well known, and essentially comprise a magnetizable surface, such as the surface of a drum or belt, which is movable relative to a set of recording heads and can be selectively magnetized by the heads in accordance with the matter to be printed or displayed, the surface then being dusted with magnetic powder which adheres to the magnetized regions, thus forming a powder image.
  • the dusted surface may then be used directly for display of the powder image, or it may be used as a printing element for transferring the image to a further surface such as a paper tape or sheet.
  • a magnetic printing and/or display device an arrangement for scavenging magnetic powder from the movable magnetizable surface of the device, the arrangement including a nonmagnetic tube disposed adjacent the magnetizable surface, the axis of the tube being parallel to the surface and perpendicular to its direction of movement, a magnetic rotor inside the tube whose axis is parallel with the tube, the rotor producing a system of magnetic flux at the outer surface of the tube which is divergent in a plane perpendicular to the tube axis, and a nonmagnetic ledge extending substantially tangentially from the outer surface of the tube, the arrangement being such that rotation of the rotor in a given direction causes powder attracted by the rotor from the magnetizable surface to creep around the outer surface of the tube and onto the ledge by somersaulting of the powder as the divergent flux field repeatedly scans the outer surface of the tube, the powder being returned under the influence of gravity
  • FIG. 1 is a schematic representation in perspective view of the relevant parts of the magnetic powder scavenging arrangement in a magnetic printing and/or display device according to the invention.
  • FIG. 2 is a cross-sectional view of the arrangement of FIG. 1.
  • a nonmagnetic ledge 6 extends tangentially from the outer surface of the tube 5 and curves downwardly and outwardly so that its free edge hangs clear of the drum 1.
  • a magnetic rotor 7 is located inside the tube 5 for rotation about an axis 8 parallel with the tube.
  • the rotor may comprise a plurality of mutually parallel bar magnets 9, which are disposed side-by-side with their like poles adjacent, thus effectively fonning a flat rectangular magnet magnetized from edge to edge in a direction perpendicular to its'axis.
  • Each edge of the rotor produces at the outer surface of the tube 5 a system of magnetic flux which is divergent in a planeperpendicular to the tube axis (FIG. 2).
  • the drum rotates in the direction of the arrow A, and after display and/or printing of the recorded matter has taken place in the usual way the surface 4 of the drum moves towards the tube 5.
  • the rotor 7 rotates in the direction of arrow B and scavenges the powder 10 still adhering to the surface 4 by attraction onto the tube 5 as the surface 4 moves past the tube.
  • The. arrangement is such that the attracted powder 1 1, according to the principle discussed in the copending application referred to above, creeps around the I outer surface of the tube 5 in the direction of arrow C, i.e. in
  • the trough 12 contains the supply of powder used for dusting the drum surface after the matter has been recorded, preferably using the powder applicator described in the copending application mentioned above, and thus the scavenged powder can be reapplied to the drum'surface.
  • said magnetic rotor is a flat rectangular magnet magnetized from edge to edge in a direction perpendicular to its axis of rotation.
  • the flat rectangular magnet comprises a plurality of mutually parallel bar magnets disposed side-by-side with their like poles adjacent.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Methods (AREA)
  • Non-Mechanical Conveyors (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Cleaning In General (AREA)
US30730A 1969-05-30 1970-04-22 Magnetic powder scavenging arrangement Expired - Lifetime US3659311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2747469 1969-05-30

Publications (1)

Publication Number Publication Date
US3659311A true US3659311A (en) 1972-05-02

Family

ID=10260179

Family Applications (1)

Application Number Title Priority Date Filing Date
US30730A Expired - Lifetime US3659311A (en) 1969-05-30 1970-04-22 Magnetic powder scavenging arrangement

Country Status (8)

Country Link
US (1) US3659311A (enrdf_load_stackoverflow)
AU (1) AU1481970A (enrdf_load_stackoverflow)
BE (1) BE759075R (enrdf_load_stackoverflow)
CH (1) CH541164A (enrdf_load_stackoverflow)
DE (1) DE2025513A1 (enrdf_load_stackoverflow)
FR (1) FR2043821A6 (enrdf_load_stackoverflow)
GB (1) GB1250933A (enrdf_load_stackoverflow)
NL (1) NL7007867A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791730A (en) * 1971-01-12 1974-02-12 Xerox Corp Apparatus for developing electrostatic latent images
US3834804A (en) * 1972-12-06 1974-09-10 Xerox Corp Copying machine with means for mounting carrier bead pickoff roller therein
US3882822A (en) * 1971-01-12 1975-05-13 Xerox Corp Apparatus for Developing Electrostatic Latent Images
US3882823A (en) * 1973-08-15 1975-05-13 Minolta Camera Kk Stirring and scraping device for developing material
US4172030A (en) * 1976-10-21 1979-10-23 Fuji Electric Co., Ltd. Non-magnetic metal selecting method and apparatus
US4297969A (en) * 1978-11-10 1981-11-03 Canon Kabushiki Kaisha Magnetic powder transporting device
US4349270A (en) * 1979-10-11 1982-09-14 Minolta Camera Co., Ltd. Developer removing device for copying apparatus
US4457257A (en) * 1982-07-30 1984-07-03 Tokyo Shibaura Denki Kabushiki Kaisha Developing device
US4547063A (en) * 1983-07-25 1985-10-15 Xerox Corporation Moving magnet cleaner
US4557584A (en) * 1983-05-25 1985-12-10 Xerox Corporation Development apparatus in which the escape of particles is minimized
US4918488A (en) * 1989-06-26 1990-04-17 Eastman Kodak Company Scavenging apparatus
US4928149A (en) * 1989-03-03 1990-05-22 Xerox Corporation Contaminant cleaner
US4994863A (en) * 1989-12-18 1991-02-19 Eastman Kodak Company Electrostatic scavenger having magnetic drive disk

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7801442U1 (de) * 1978-01-19 1978-07-20 Basf Ag, 6700 Ludwigshafen Vorrichtung zum reinigen von folienbahnen mit einer magnetschicht
JPH0822592B2 (ja) * 1987-11-06 1996-03-06 ビー・ジェー・トレーディング有限会社 シリンダ洗浄装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152924A (en) * 1961-05-24 1964-10-13 Robertson Photo Mechanix Inc Xerographic brush
US3402698A (en) * 1966-06-06 1968-09-24 Konishiroku Photo Ind Magnet assembly for magnetic developing brush and developing apparatus for electrostatic process
US3472695A (en) * 1964-02-06 1969-10-14 Agfa Ag Method for forming an image in a magnetizable ink layer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152924A (en) * 1961-05-24 1964-10-13 Robertson Photo Mechanix Inc Xerographic brush
US3472695A (en) * 1964-02-06 1969-10-14 Agfa Ag Method for forming an image in a magnetizable ink layer
US3402698A (en) * 1966-06-06 1968-09-24 Konishiroku Photo Ind Magnet assembly for magnetic developing brush and developing apparatus for electrostatic process

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791730A (en) * 1971-01-12 1974-02-12 Xerox Corp Apparatus for developing electrostatic latent images
US3882822A (en) * 1971-01-12 1975-05-13 Xerox Corp Apparatus for Developing Electrostatic Latent Images
US3834804A (en) * 1972-12-06 1974-09-10 Xerox Corp Copying machine with means for mounting carrier bead pickoff roller therein
US3882823A (en) * 1973-08-15 1975-05-13 Minolta Camera Kk Stirring and scraping device for developing material
US4172030A (en) * 1976-10-21 1979-10-23 Fuji Electric Co., Ltd. Non-magnetic metal selecting method and apparatus
US4297969A (en) * 1978-11-10 1981-11-03 Canon Kabushiki Kaisha Magnetic powder transporting device
US4349270A (en) * 1979-10-11 1982-09-14 Minolta Camera Co., Ltd. Developer removing device for copying apparatus
US4457257A (en) * 1982-07-30 1984-07-03 Tokyo Shibaura Denki Kabushiki Kaisha Developing device
US4557584A (en) * 1983-05-25 1985-12-10 Xerox Corporation Development apparatus in which the escape of particles is minimized
US4547063A (en) * 1983-07-25 1985-10-15 Xerox Corporation Moving magnet cleaner
US4928149A (en) * 1989-03-03 1990-05-22 Xerox Corporation Contaminant cleaner
US4918488A (en) * 1989-06-26 1990-04-17 Eastman Kodak Company Scavenging apparatus
US4994863A (en) * 1989-12-18 1991-02-19 Eastman Kodak Company Electrostatic scavenger having magnetic drive disk

Also Published As

Publication number Publication date
DE2025513A1 (de) 1970-12-03
CH541164A (de) 1973-08-31
AU1481970A (en) 1971-11-18
FR2043821A6 (enrdf_load_stackoverflow) 1971-02-19
BE759075R (nl) 1971-05-18
NL7007867A (enrdf_load_stackoverflow) 1970-12-02
GB1250933A (enrdf_load_stackoverflow) 1971-10-27

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