US3599225A - Electrostatic recording apparatus - Google Patents

Electrostatic recording apparatus Download PDF

Info

Publication number
US3599225A
US3599225A US686238A US3599225DA US3599225A US 3599225 A US3599225 A US 3599225A US 686238 A US686238 A US 686238A US 3599225D A US3599225D A US 3599225DA US 3599225 A US3599225 A US 3599225A
Authority
US
United States
Prior art keywords
aperture
electrodes
endless belt
common plane
recording apparatus
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
US686238A
Other languages
English (en)
Inventor
William Babaoff
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
Application granted granted Critical
Publication of US3599225A publication Critical patent/US3599225A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/14—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by electrographic printing, e.g. xerography; by magnetographic printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/385—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material
    • B41J2/41—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective supply of electric current or selective application of magnetism to a printing or impression-transfer material for electrostatic printing
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
    • G03G15/321—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by charge transfer onto the recording material in accordance with the image
    • 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
    • Y10S101/00—Printing
    • Y10S101/37—Printing employing electrostatic force

Definitions

  • Gold 15/20 ABSTRACT An electrostatic recording apparatus wherein a ⁇ SUI Field of Search 346/74 ES; corona source including a plurality of equidistant conductors 178/66 A are selectively pulsed to generate a corona stream in a space References (mm between a backing electrode and the pulsed conductor, this space being defined by an aperture in a dielectric member UNITED STATES PATENTS which moves the aperture in a direction substantially parallel L.893.8l0 7/1959 Miller et all r 346/74 to said conductors.
  • a 7' TORNEYS ELECTROSTATIC RECORDING APPARATUS This invention relates generally to electrostatic recording, and, more specifically, to recording apparatus employing corona generation.
  • corona stencil there exists in the prior art an electrostatic recording process which may be referred to as corona stencil.
  • a cloud or stream of corona or ions is selectively produced and directed toward a suitable dielectric recording medium.
  • This recording medium has adjacent to its side remote from the corona source a backing electrode biased to attract ions of a particular polarity.
  • a conductive stencil or mask which bears character-shaped apertures.
  • the corona stream in passing through one of these apertures toward the recording medium has its cross section so configured so as to correspond to the character represented by the particular aperture.
  • the attracted ions in this shaped corona stream deposit onto the surface of the recording medium thereby constituting a latent electrostatic charge pattern which may be rendered visible and permanent by conventional xerographic development and fixing processes.
  • the stencil so employed may take various forms such as an endless belt, a rotating drum or disc. However, once the character font or nature of the symbols for the apertures thereof to represent are chosen, only those symbols or characters may be used in any recording. If different fonts or symbols are desired, then a new stencil must be made and incorporated into the system. l I
  • a still further object of the present invention is to provide an improved electrostatic recording apparatus which is simple and compact.
  • a corona source including a plurality of equidistant conductors are selectively pulsed to generate a corona stream in a space between a backingelectrode andthe pulsed conductor, thisspace being defined by an aperture in a dielectric member which moves the aperture in a direction substantially parallel to said conductors.
  • FIG. 1 is a perspective view of the electrostatic recording apparatus in accordance with the principles of the present invention
  • FIG. 2 represents a cross-sectional view of the recording station of the present invention
  • FIG. 3 illustrates the manner in which alphanumeric information is recorded'in accordance with-the principles of the present invention
  • FIG. 4 shows schematically in blockform a typical circuit which may be used with the present invention.
  • FIGS. 5 A-G illustrate typical pulse waveforms generated by the circuit of FIG. 4.
  • a dielectric web 2 may be guided through a recording station via two idler rollers 4 in a direction indicated by the arrow.
  • this web 2 may be under tension and may be moved in a step-by-step manner by any one. of several conventional means, for example, a motor-indexing clutch combination.
  • a motor-indexing clutch combination For purposes of this description, it is only necessary that such a combination maintain the web motionless during a recording cycle and index this web a predetermined distance between recording cycles. This indexing may be initiated strictly on a 2 timing basis, i.e., the web is indexed afier'every period r where t is slightly longer than the time required to complete a'r'araing cycle. 7
  • the web 2 may be threaded through conventional xerographic developing and fusing stations, which, for simplicity, are not illustrated in FIG. 1.
  • the dielectric web 2 may be in contact with a backing electrode 6 which forms one boundary of a corona space at the recording station.
  • the other boundary of this corona space is formed by a plurality of pulsed electrodes 8 which are substantially parallel with each other in a single plane. As shown, these pulsed electrodes 8 are embedded in the surface of' an insulating block 10 thereby permitting a portion of the insulating block 10 to insulate adjacent electrodes from each other.
  • Electrodes 8 are referred to as pulsed electrodes to distinguish them for purposes of explanation from electrode 6. Generally, as will be further described hereinafter, voltage pulses may be selectively applied to desired electrodes 8 while backing electrode 6 may be maintained at a constant predetermined reference voltage.
  • the dielectric constant of the material constituting insulating block l0- is of such a suitable value so as to effectively eliminate any discharge between adjacent electrodes 8.
  • a dielectric mask shown in the form of an endless belt 12 driven via pulleys 14 (in a direction as indicated by the arrows) by motive force provided by motor 16;.
  • This motor is mechanically coupled to pulley by way of a drive belt I8 and shaft 20.
  • This motor has the characteristic of being capable of driving the belt 12 at a substantially constant speed.
  • the actual corona space is defined by any one of a plurality of slits 22 in this belt 12 which is between the pulsed electrodes and the backing electrode.
  • This slit is preferably uniform in width and height and may be rectangularly configured so that its longest dimension is slightly longer than the dimension of the insulating block I0 which lies in the plane of electrodes 8 and transverse thereto.
  • the minimum length which this dimension may have is one equal to the distance sgparating the nonadjacent outermost edges of the two most remote electrodes 8.
  • the dimensions of the backing electrode should preferably be equal to that of the ,pulsedelectrode combination so as to insure a uniform corona spacealongbothdimensions of the recording station.
  • the dielectric belt .12 may move in a contacting relation withth e pulsed electrode array permitting an air gap between it and the dielectric web 2..It should beappreciated that since the belt 12 is a dielectricit will notshort the pulsed electrodes 8.
  • the recording apparatus as shown in FIG. 1 isrepresented by block 26 andhas a pluralityof inputs 28, such as seven, from a similar plurality ofconventional amplifiers designated by reference numeral 30.
  • each one. ofthese inputs 28 is associated-withandcoupled to one of the pulsed electrodes.
  • '1 I V The amplifiers serve to amplify pulses generated ,on the sense lines of a conventional character magnetic corematrix 32.
  • the character wires of the matrix arein turncoupledto the outputs of a conventional decoder circuit 34 whichacts to decode character codes, for example,stored in an input buffer 36 also of conventional design.
  • a typicalexampleof a decoder and core matrix is shown and described in U. S. Pat.
  • FIG. 4 This typical circuit as shownin .FIG. 4 will,,in.the case of character E," generate a plurality of parallel voltage pulse trains as shownin FIGS.;5 A -GJn orderto facilitate this description, the time abscissa for thesepulsetrains runs from right to left as.FIG.-5 is viewed and corresponds with the sequential movement of slit .22 ,dep'icted in ;..FIG. ;3.in .a direction as indicated by the arrow. Thepgsitionof the slit 2j2 as shown inFIG.
  • the corona streams generated act to deposit charges of one polarity onto the surface of the dielectric web 2 in a configuration which reflects the point or points of intersection of the slit 22 and one or more of the electrodes 8 which is at that time at the proper voltage.
  • This selective corona generation is continued until the entire letter B is recorded on the dielectric web 2 as a latent electrostatic charge pattern. Then another character may be processed and recorded in a similar manner as described.
  • the mask or belt 12 may have as many slits therein as desired so long as the distance separating adjacent slits is slightly greater or equal to the dimension of the recording area or zone on dielectric web 2 which is in the direction of movement ofthe slit 22.
  • pulse generating circuits may be used to selectively pulse the recorder.
  • the belt 12 does not necessarily have to contact the pulsed electrodes 8 nor be separated by a gap from the dielectric recording web 2.
  • Recording apparatus comprising:
  • a backing electrode having a surface spaced from and substantially parallel to said common plane
  • selectively movable means having at least one aperture therein movable intermediate said surface and said common plane, said aperture having at least two substantially parallel opposite sides;
  • motive means mechanically coupled to said movable means for moving said aperture in a direction from said first ends to said second ends.
  • Recording apparatus as defined in claim 1 further including circuit means for selectively establishing a corona generating field between selected linear electrodes and said backing electrode through said aperture in response to electrical signals.
  • said movable means includes an endless belt of dielectric material which contacts said linear electrodes and further including means for selectively positioning a recording medium intermediate said surface of said backing electrode and said endless belt.
  • An electrostatic recording system comprising:
  • a backing electrode having a surface substantially parallel to said common plane and spaced therefrom;
  • motive means mechanically coupled to said belt for moving said aperture between said surface and said common plane where the direction of movement is substantially perpendicular to said two opposite sides;
  • signal means coupled to said linear electrodes for generating a corona stream through said aperture during movement thereof and between said surface and selected linear electrodes.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
US686238A 1967-11-28 1967-11-28 Electrostatic recording apparatus Expired - Lifetime US3599225A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68623867A 1967-11-28 1967-11-28

Publications (1)

Publication Number Publication Date
US3599225A true US3599225A (en) 1971-08-10

Family

ID=24755498

Family Applications (1)

Application Number Title Priority Date Filing Date
US686238A Expired - Lifetime US3599225A (en) 1967-11-28 1967-11-28 Electrostatic recording apparatus

Country Status (3)

Country Link
US (1) US3599225A (enrdf_load_stackoverflow)
DE (1) DE1810076A1 (enrdf_load_stackoverflow)
GB (1) GB1226436A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711860A (en) * 1971-05-25 1973-01-16 Honeywell Inc Arc discharge recording apparatus with pigment carrier
US3815145A (en) * 1972-07-19 1974-06-04 Electroprint Inc Electrostatic printing system and method using a moving shutter area for selective mechanical and electrical control of charged particles
US3865031A (en) * 1973-02-26 1975-02-11 Ibm Ink spray printer
US3961574A (en) * 1975-01-15 1976-06-08 Horizons Incorporated Electrostatic bar code printer
US4117518A (en) * 1973-12-03 1978-09-26 Skala Stephen F Ink drop facsimile system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893810A (en) * 1958-01-03 1959-07-07 Thompson Ramo Wooldridge Inc Recorder mechanism
US3321768A (en) * 1960-05-12 1967-05-23 Burroughs Corp Electrostatic recording with interchangeable stencils
US3362325A (en) * 1965-07-12 1968-01-09 Borg Warner Electrostatic printer employing belt type stencil thru which ions are deposited
US3413654A (en) * 1964-11-25 1968-11-26 Honeywell Inc Electrostatic trace recorder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2893810A (en) * 1958-01-03 1959-07-07 Thompson Ramo Wooldridge Inc Recorder mechanism
US3321768A (en) * 1960-05-12 1967-05-23 Burroughs Corp Electrostatic recording with interchangeable stencils
US3413654A (en) * 1964-11-25 1968-11-26 Honeywell Inc Electrostatic trace recorder
US3362325A (en) * 1965-07-12 1968-01-09 Borg Warner Electrostatic printer employing belt type stencil thru which ions are deposited

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Xerography: Dessaner S. Clark; The Focal Press; 1965; Pages 201-202. *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3711860A (en) * 1971-05-25 1973-01-16 Honeywell Inc Arc discharge recording apparatus with pigment carrier
US3815145A (en) * 1972-07-19 1974-06-04 Electroprint Inc Electrostatic printing system and method using a moving shutter area for selective mechanical and electrical control of charged particles
US3865031A (en) * 1973-02-26 1975-02-11 Ibm Ink spray printer
US4117518A (en) * 1973-12-03 1978-09-26 Skala Stephen F Ink drop facsimile system
US3961574A (en) * 1975-01-15 1976-06-08 Horizons Incorporated Electrostatic bar code printer

Also Published As

Publication number Publication date
GB1226436A (enrdf_load_stackoverflow) 1971-03-31
DE1810076A1 (de) 1969-07-10

Similar Documents

Publication Publication Date Title
US3815145A (en) Electrostatic printing system and method using a moving shutter area for selective mechanical and electrical control of charged particles
JP2568848B2 (ja) 静電式プリンタ用画像形成素子及び情報プリント装置
US2955894A (en) Page printing apparatus
JPS5920678A (ja) 流体ジェットを利用したイオン流印刷装置
US3599225A (en) Electrostatic recording apparatus
US4704621A (en) Printing device
US3742516A (en) Electro-ionic printing apparatus
US3136934A (en) Reciprocating linear motor system
US3979757A (en) Electrostatic display system with toner applied to head
US3182591A (en) Image forming apparatus and method
US3234904A (en) Device for tesiprinting
US3979760A (en) Electrostatic recording apparatus with auxiliary electrodes
US3195142A (en) Electrographic recording process and apparatus
US3289209A (en) Electrostatic matrix printer
JPS5839674B2 (ja) セイデンインサツヨウノデンキテキニ マドレスサレル アナアキヘンチヨウキ
US4176362A (en) High density magnetic image recording head
US2925310A (en) Direct writing oscillograph
US3684075A (en) Belt printer with conductive elements on non-conductive belt
US4899186A (en) Ionographic device with pin array coronode
US4949950A (en) Electrostatic sheet transport
US3509816A (en) Printing arrangement utilizing a continuously moving transfer band
US3362325A (en) Electrostatic printer employing belt type stencil thru which ions are deposited
US4146898A (en) Non-contact magnetic toner transfer system
US3372400A (en) Electrostatic recorder with plural electrodes and biased mask
US3493157A (en) Drive systems involving electrostatic forces