US3816799A - Electrostatic charge elimination for magnetic printing system - Google Patents

Electrostatic charge elimination for magnetic printing system Download PDF

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Publication number
US3816799A
US3816799A US00256993A US25699372A US3816799A US 3816799 A US3816799 A US 3816799A US 00256993 A US00256993 A US 00256993A US 25699372 A US25699372 A US 25699372A US 3816799 A US3816799 A US 3816799A
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United States
Prior art keywords
magnetic
toner
particles
recording surface
recorded
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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
US00256993A
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English (en)
Inventor
O Ott
D Ginn
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Recognition Equipment Inc
Data Interface Inc
Original Assignee
Data Interface Inc
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Publication date
Application filed by Data Interface Inc filed Critical Data Interface Inc
Priority to US00256993A priority Critical patent/US3816799A/en
Priority to CA170,102A priority patent/CA983700A/en
Priority to GB2039473A priority patent/GB1387952A/en
Priority to NL7306042A priority patent/NL7306042A/xx
Priority to IL42157A priority patent/IL42157A0/xx
Priority to FR7317763A priority patent/FR2185825B1/fr
Priority to DE2324620A priority patent/DE2324620A1/de
Priority to JP48058514A priority patent/JPS4944758A/ja
Application granted granted Critical
Publication of US3816799A publication Critical patent/US3816799A/en
Assigned to RECOGNITION EQUIPMENT INCORPORATED reassignment RECOGNITION EQUIPMENT INCORPORATED ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INFOREX, INC.
Assigned to CHEMICAL BANK, A NY BANKING CORP. reassignment CHEMICAL BANK, A NY BANKING CORP. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: PLEXUS SOFTWARE, INC., RECOGNITION EQUIPMENT INCORPORATED
Assigned to RECOGNITION EQUIPMENT INCORPORATED ("REI"), A CORP. OF DE. reassignment RECOGNITION EQUIPMENT INCORPORATED ("REI"), A CORP. OF DE. RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CHEMICAL BANK, A NY. BANKING CORP.
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 technique and apparatus for removing electrostatically attracted magnetic toner particles from a recorded surface on which magnetic images are formed for magnetic printing. Magnetic toner powder is applied to a surface having magnetic images recorded thereon, the toner adhering to the recorded areas for subsequent transfer to a writing surface. An electrical discharge path is provided from the recording surface to discharge electrostatically attracted particles spuriously attached to the recorded surface. Spurious particles are thereby removed from the recorded surface and are not transferred to a writing surface, with a result that cleaner and more easily readable printed material is produced.
  • This invention relates to magnetic printing systems and more particularly to apparatus and a technique for the removal of electrostatically attracted particles of magnetic toner spuriously attached to a magnetic surface along with intended toner particles for printing.
  • a magnetic image is recorded on a magnetic tape or other recording medium to represent characters or other data to be printed, and magnetic toner powder is applied to the recorded areas of the tape.
  • the toner is then transferred from the tape to a confronting writing surface to form a printed image.
  • Toner powder is typically applied to the tape by means of a rotating brush or impeller which conveys powder from a reservoir onto the tape surface.
  • agitation of toner particles can cause particles to acquire an electrostatic charge, the charged particles becoming attached to the tape in areas not defined by the magnetic image.
  • electrostatically attached particles can produce unwanted gray background areas on the printed material when toner is transferred from the tape to the writing surface. It is an object of the present invention to provide a technique and apparatus for the substantial reduction of the number of electrostatically charged particles which can become affixed to the tape surface and which results in a significantly cleaner printed image.
  • a conductive discharge path is provided from the recording surface such that electrostatically charged particles are discharged and removed from the tape surface prior to printing.
  • a relatively dense mass of toner powder is provided in contact with the tape surface on which a magnetic image is formed, this mass of toner by reason of the close spacing of particles thereof having a higher electrical conductivity than the more dispersed toner powder being brushed or otherwise applied to the tape surface for attraction to the magnetically recorded image areas.
  • the relatively high electrical conductivity of the toner mass serves to remove the electrostatic charge of particles electrostatically attracted to the tape surface, and upon being discharged the spurious particles are removed from the tape surface leaving the intended particles magnetically adhered to the recorded image areas.
  • a toner applicator embodying the invention comprises a rotating brush disposed within a cylindrical reservoir of toner powder having an inside diameter approximating the diameter of the rotating brush.
  • An aperture is provided past which the tape is caused to move, and the brush upon rotation is operative to apply toner from the reservoir onto the tape surface for adherance of toner particles to the recorded image areas.
  • a shelf is provided in the aperture in a position removed from the tape surface, the shelf being operative to maintain a mass of toner powder between the shelf and confronting tape surface to provide a relatively high conductivity mass for discharge of spuriously applied toner particles.
  • the high conductivity mass is provided at a position which confronts the tape surface subsequent to the application of toner.
  • the toner powder applied to the recorded areas of the tape surface, as well as the electrostatically attracted spurious particles are moved across the confronting surface of a conductive plate which is effective to discharge the electrostatically attracted particles while the magnetically attracted particles remain adhered to the recorded tape surface for subsequent transfer to the writing surface.
  • FIG. 1 is a diagrammatic representation of a magnetic printing system of a type in which the invention is especially useful
  • FIG. 2 is a pictorial view, partly cutaway, of a toner applicator embodying the invention.
  • FIG. 3 is a cutaway elevation view of a portion of the toner application of FIG. 2;
  • FIG. 4 is a cutaway elevation view of an alternative toner applicator embodying the invention.
  • FIG. 5 is a cutaway pictorial view of a portion of the toner applicator of FIG. 4.
  • a magnetic printing system in which the invention is especially useful is shown in diagrammatic form in FIG. 1.
  • a magnetic tape 10 or other suitable magnetic recording medium is disposed for movement along a predetermined path in the direction indicated by arrow 12.
  • a magnetic recording head 14 is provided in operative relation with the recording surface of tape 10 and is connected to recording circuitry 16 operative to provided recording signals to the tape for formation of magnetic images thereon representing characters or other data to be printed:
  • a toner applicator 18 embodying the present invention is disposed in association with the recording surface of tape 10 and is operative to apply magnetic toner powder to the tape for adherance to the recorded areas thereof. Patterns of magnetic toner are thereby provided as defined by the configuration of the recorded areas, and these patterns are transferred to a writing surface to form the printed image.
  • a writing surface such as a paper sheet 20 is provided in juxtaposition to the surface of tape 10 containing the toner, and transfer of toner from the tape onto the writing surface is accomplished by print transfer apparatus 22 which impresses the confronting surfaces of tape 10 and sheet 20 into engagement against a platen 24.
  • the transfer apparatus can include, for example, a helical cam which sequentially transverses the writing surface to cause transfer of a line characters from the tape onto the writing surface. Any magnetic toner particles remaining on the tape after printing are removed by a magnetic erase head 26 cooperative with erase circuitry 28.
  • the magnetic tape is of endless loop configuration such that the tape is continually re-employed with new recorded information to be printed.
  • the toner applica tor 18 includes means for substantially eliminating the problem of spurious toner particles electrostatically attracted to the tape surface.
  • the toner applicator is shown in FIGS. 2 and 3 and includes a housing 30 having a rectangular aperture 32 on the upper face thereof which confronts a surface of magnetic tape 10 arranged for movement past aperture 32.
  • a cover member 34 is provided on the opposite surface of tape 10 to retain the tape in close alignment with the aperture and to prevent the release of toner particles from housing 30.
  • the housing contains magnetic toner powder 36 and a cylindrical brush-38 rotatably disposed therein.
  • the brush 38 includes bristles 40 affixed to a hub 42 having a shaft 44 journaled in a bearing provided in a side wall of housing 30.
  • the shaft 44 is connected to a motor 46 or other motive means for rotation of brush 38 within the housing.
  • the interior 'of housing 30 is cylindrical and of a diameter substantially the same as the diameter of brush 38.
  • the ends of bristles 40 within aperture 32 are closely adjacent the confronting tape surface for application of toner particles thereto.
  • a shelf 48 is provided within housing 30 in spaced apart relationship with the surface of tape 10 to which toner is being applied, and this shelf is in a position to confront the tape subsequent to the application of toner to the recorded areas thereof.
  • a mass 50 of toner powder is supported by shelf 48 in contact with the confronting tape surface and this mass is of sufficient density to provide an electrical conductivity higher than that of the dispersed toner particles being applied to the recorded areas of tape 10.
  • the more highly conductive mass 50 is effective to discharge the electrostatic charge of the particles spuriously affixed to the tape, and, upon discharge, the spurious particles are removed from the tape surface and are collected as part of the mass 50.
  • the toner applied to the magnetically recorded areas of tape 10 is not affected by the presence of mass 50 and is moved through this mass into a position for transfer onto the writing surface.
  • the resulting printed image is quite clean and sharp since spurious toner particles which could impair print quality are removed from the tape surface prior to imprinting of the recorded images.
  • FIGS. 4 and 5 An alternative embodiment of the invention is depicted in FIGS. 4 and 5 wherein the electrostatic charge of toner particles is removed by passage of the tape surface containing toner thereon past the confronting surface of a conductive plate.
  • the tape 10 passes over a curved plate 60 provided on the top of the toner applicator housing and having a rectangular aperture 62 through which toner powder is applied to the recording surface of the tape.
  • a recessed channel 64 is provided adjacent aperture 62 over which the tape having toner applied thereto is moved in its travel towards a printing position at which toner is transferred to a writing surface.
  • the recessed portion 64 of plate 60 allows the passage of the mass of toner adhered to the recording surface without removal of significant amounts of the magnetically attracted toner.
  • the conductivity of the toner mass is higher than that of the dispersed particles being applied by the toner applicator to the tape surface, such that the electrostatic charges of the particles spuriously affixed to the tape are discharged to the conductive plate 60.
  • the discharged particles fall or are wiped from the tape, and excess amounts of toner as well as the discharged particles removed from the tape fall back into the reservoir through an opening 66 provided in plate 68 which serves as a mechanical shield and which typically is formed of spring material urged into contact with the recording surface of the tape.
  • the rotatable toner applicator brush 70 is disposed for rotation on a hub 72 and includes bristles having tapered ends 74 which generally conform to'the curve of the apertured plate 60.
  • An arm 76 fastened to the toner applicator housing has an edge portion 78 which is bent into engagement with the bristle ends in a portion near the aperture 62.
  • the edge 78 is operative open rotation of brush 70 to cause a snapping or flicking of the bristles through aperture 62 and onto the recording surface in confronting relation therewith.
  • the toner applicator brush 70 preferably engages the confronting portion 80 of the interior wall of the toner reservoir to collect toner powder within the reservoir.
  • a second brush 82 having diametrically opposed bristles 84 is provided within the toner applicator and is rotatable on a hub 86 driven in the same direction as that of brush 70.
  • the bristles 84 are disposed to engage the bristle ends of brush 70 during operation to agitate the bristles of brush 70 and maintain the toner particles in a dispersed and noncompacted state.
  • the brushes 70 and 84 are driven by a belt 88 engaging hubs 72 and 86 and which in the illustrated embodiment is formed of helical wire spring material to provide an open structure which prevents bunching and compacting of the toner powder.
  • the hub 86 is smaller in diameter than that of hub 72 and brush 84 thus rotates at a faster rate than brush 70 and causes rapid agitation of brush 70 and the toner powder.
  • the tape is maintained in position against the upper surface of the toner applicator by means of a pressure roller.
  • Apparatus for the removal of spurious magnetic tone'r particles electrostatically affixed to a surface on which magnetic images are recorded comprising:
  • a housing containing a supply of magnetic toner powder and having an aperture disposed in confronting relation to a recording surface;
  • apparatus for use in magnetic printing apparatus having a surface on which magnetic recorded images are formed and an applicator for applying magnetic toner powder to recorded areas of said surface, apparatus for removing spurious toner particles electrostatically affixed to said surface and comprising:
  • a method for removing spurious electrostatically attracted magnetic toner particles from a magnetically recorded surface comprising the steps of:
  • Apparatus for applying magnetic toner powder to a recording surface of a magnetic recording medium comprising:
  • a housing containing a supply of magnetic toner powder and having an aperture disposed in confronting relation to a recording surface;
  • a generally cylindrical brush mounted for rotation in said housing at a position confronting said aperture and operative to collect toner powder in said housmg;
  • said conductive discharge means including means for maintaining a mass of toner powder in contact with said recording surface and of a density providing an electrical conductivity sufiicient to discharge spuriously attracted toner particles adhered to said surface by electrostatic attraction.
  • Apparatus for the removal of spurious magnetic toner particles electrostatically affixed to a surface on which magnetic images are recorded comprising:
  • a housing containing a supply of magnetic toner powder and having an aperture disposed in confronting relation to a recording surface;

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Coating Apparatus (AREA)
  • Photoreceptors In Electrophotography (AREA)
US00256993A 1972-05-25 1972-05-25 Electrostatic charge elimination for magnetic printing system Expired - Lifetime US3816799A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US00256993A US3816799A (en) 1972-05-25 1972-05-25 Electrostatic charge elimination for magnetic printing system
CA170,102A CA983700A (en) 1972-05-25 1973-04-30 Electrostatic charge elimination for magnetic printing system
GB2039473A GB1387952A (en) 1972-05-25 1973-04-30 Electrostatic charge elimination for magnetic printing system
IL42157A IL42157A0 (en) 1972-05-25 1973-05-01 Method and apparatus for electrostatic charge elimination in magnetic printing systems
NL7306042A NL7306042A (enrdf_load_stackoverflow) 1972-05-25 1973-05-01
DE2324620A DE2324620A1 (de) 1972-05-25 1973-05-16 Verfahren und vorrichtung zum entfernen von unerwuenscht elektrostatisch angezogenem magnetischem farbpulver von einer magnetaufzeichnungsflaeche eines magnetschriftdrukkers
FR7317763A FR2185825B1 (enrdf_load_stackoverflow) 1972-05-25 1973-05-16
JP48058514A JPS4944758A (enrdf_load_stackoverflow) 1972-05-25 1973-05-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00256993A US3816799A (en) 1972-05-25 1972-05-25 Electrostatic charge elimination for magnetic printing system

Publications (1)

Publication Number Publication Date
US3816799A true US3816799A (en) 1974-06-11

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US00256993A Expired - Lifetime US3816799A (en) 1972-05-25 1972-05-25 Electrostatic charge elimination for magnetic printing system

Country Status (8)

Country Link
US (1) US3816799A (enrdf_load_stackoverflow)
JP (1) JPS4944758A (enrdf_load_stackoverflow)
CA (1) CA983700A (enrdf_load_stackoverflow)
DE (1) DE2324620A1 (enrdf_load_stackoverflow)
FR (1) FR2185825B1 (enrdf_load_stackoverflow)
GB (1) GB1387952A (enrdf_load_stackoverflow)
IL (1) IL42157A0 (enrdf_load_stackoverflow)
NL (1) NL7306042A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859959A (en) * 1974-04-05 1975-01-14 Data Interface Magnetic toner applicator
DE2714473A1 (de) * 1976-03-31 1977-10-13 Du Pont Trockendruckverfahren und vorrichtung zur durchfuehrung desselben
US4191961A (en) * 1976-03-31 1980-03-04 E. I. Du Pont De Nemours And Company Magnetic printing process and apparatus
US4195303A (en) * 1976-03-31 1980-03-25 E. I. Du Pont De Nemours And Company Magnetic printing process and apparatus
US4216282A (en) * 1977-03-18 1980-08-05 E. I. Du Pont De Nemours And Company AC corona to remove background from the imaging member of a magnetic copier
US4314257A (en) * 1979-03-16 1982-02-02 Hitachi, Ltd. Thermomagnetic recording apparatus
US4329694A (en) * 1977-03-18 1982-05-11 E. I. Du Pont De Nemours And Company AC Corona to remove background from the transfer member of a thermomagnetic copier
US4336546A (en) * 1977-03-15 1982-06-22 E. I. Du Pont De Nemours And Company Magnetic printing apparatus
EP0079223A3 (en) * 1981-11-06 1983-11-30 Xerox Corporation Apparatus and process for removal of toner particles
US5111246A (en) * 1990-02-20 1992-05-05 Xerox Corporation Electrostatographic machine
US5150273A (en) * 1991-01-17 1992-09-22 Vantine Allan D Le Device for removing dust, lint and static charge from film and plastic surfaces
US6850403B1 (en) 2001-11-30 2005-02-01 Ion Systems, Inc. Air ionizer and method
US20090269110A1 (en) * 2008-04-23 2009-10-29 Infoprint Solutions Company Llc Toner brush with superimposed brushes for an electro-photographic printer and printer with the toner brush

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54121738A (en) * 1978-03-14 1979-09-21 Ricoh Co Ltd Toner removal method

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502284A (en) * 1967-06-08 1970-03-24 Basf Ag Magnetic tape cartridge
US3689117A (en) * 1970-07-17 1972-09-05 Minnesota Mining & Mfg Method for making a neutralizing device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2911330A (en) * 1958-04-11 1959-11-03 Haloid Xerox Inc Magnetic brush cleaning

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3502284A (en) * 1967-06-08 1970-03-24 Basf Ag Magnetic tape cartridge
US3689117A (en) * 1970-07-17 1972-09-05 Minnesota Mining & Mfg Method for making a neutralizing device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3859959A (en) * 1974-04-05 1975-01-14 Data Interface Magnetic toner applicator
DE2714473A1 (de) * 1976-03-31 1977-10-13 Du Pont Trockendruckverfahren und vorrichtung zur durchfuehrung desselben
US4191961A (en) * 1976-03-31 1980-03-04 E. I. Du Pont De Nemours And Company Magnetic printing process and apparatus
US4195303A (en) * 1976-03-31 1980-03-25 E. I. Du Pont De Nemours And Company Magnetic printing process and apparatus
US4336546A (en) * 1977-03-15 1982-06-22 E. I. Du Pont De Nemours And Company Magnetic printing apparatus
US4329694A (en) * 1977-03-18 1982-05-11 E. I. Du Pont De Nemours And Company AC Corona to remove background from the transfer member of a thermomagnetic copier
US4216282A (en) * 1977-03-18 1980-08-05 E. I. Du Pont De Nemours And Company AC corona to remove background from the imaging member of a magnetic copier
US4314257A (en) * 1979-03-16 1982-02-02 Hitachi, Ltd. Thermomagnetic recording apparatus
EP0079223A3 (en) * 1981-11-06 1983-11-30 Xerox Corporation Apparatus and process for removal of toner particles
US5111246A (en) * 1990-02-20 1992-05-05 Xerox Corporation Electrostatographic machine
US5150273A (en) * 1991-01-17 1992-09-22 Vantine Allan D Le Device for removing dust, lint and static charge from film and plastic surfaces
US6850403B1 (en) 2001-11-30 2005-02-01 Ion Systems, Inc. Air ionizer and method
US20090269110A1 (en) * 2008-04-23 2009-10-29 Infoprint Solutions Company Llc Toner brush with superimposed brushes for an electro-photographic printer and printer with the toner brush
US7848695B2 (en) 2008-04-23 2010-12-07 Infoprint Solutions Company, Llc Toner brush with superimposed brushes for an electro-photographic printer and printer with the toner brush

Also Published As

Publication number Publication date
FR2185825A1 (enrdf_load_stackoverflow) 1974-01-04
FR2185825B1 (enrdf_load_stackoverflow) 1979-03-30
GB1387952A (en) 1975-03-19
DE2324620A1 (de) 1973-12-06
CA983700A (en) 1976-02-17
JPS4944758A (enrdf_load_stackoverflow) 1974-04-27
NL7306042A (enrdf_load_stackoverflow) 1973-11-27
IL42157A0 (en) 1973-07-30

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AS Assignment

Owner name: RECOGNITION EQUIPMENT INCORPORATED 2701 EAST GRAUW

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INFOREX, INC.;REEL/FRAME:004391/0882

Effective date: 19850315

AS Assignment

Owner name: CHEMICAL BANK, A NY BANKING CORP.

Free format text: SECURITY INTEREST;ASSIGNORS:RECOGNITION EQUIPMENT INCORPORATED;PLEXUS SOFTWARE, INC.;REEL/FRAME:005323/0509

Effective date: 19891119

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Owner name: RECOGNITION EQUIPMENT INCORPORATED ("REI") 2701 EA

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CHEMICAL BANK, A NY. BANKING CORP.;REEL/FRAME:005439/0823

Effective date: 19900731