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US3911447A - Electrographic writing apparatus for a metallized strip recording medium using grounded electrodes between writing electrodes - Google Patents

Electrographic writing apparatus for a metallized strip recording medium using grounded electrodes between writing electrodes Download PDF

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Publication number
US3911447A
US3911447A US467891A US46789174A US3911447A US 3911447 A US3911447 A US 3911447A US 467891 A US467891 A US 467891A US 46789174 A US46789174 A US 46789174A US 3911447 A US3911447 A US 3911447A
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US
United States
Prior art keywords
writing
electrodes
recording medium
electrode
grounded
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
US467891A
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English (en)
Inventor
Alfred Ortlieb
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
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Publication of US3911447A publication Critical patent/US3911447A/en
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    • 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
    • B41J2/425—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 removing surface layer selectively from electro-sensitive material, e.g. metal coated paper

Definitions

  • ABSTRACT The electrodes of a burnout type electrographic apparatus are grounded during their idle period in order to clear any possible short circuit to an active electrode by the accumulation of metal particles or oxide whiskers which would otherwise cause more than one electrode to be simultaneously activated
  • An auxiliary grounding electrode is interposed between each pair of adjacent writing electrodes.
  • This invention relates to an apparatus writing upon a recording medium, particularlyrecording medium having a metal layer subject toelectrical burnout on a carrier such as a paper or synthetic resin tape.
  • the appara-' tus writing upon the tape has a multiplicity of writing electrodes insulated from each other and disposed in medium carrier tape is almost always moved in the same direction, so that the bur'nout residues and the metal particles loosened from the metal layer by the writing electrodes moving in contact with the layer can stick to the writing electrode points and form an oxide whisker.
  • Such an oxide whisker which'is electrically conductive, can cause a short circuit between'two adjacent writing electrodes, with results that are troublesome both for a visible text writing operation and for a writing operation of the perferation code type producing coded indications similar to the holes in a punched tape or a card.
  • the metal layer lying under both of the electrodes thus connected is burned out whenever aiburnout signal is provided to only one of the electrodes, producing a false writing resultI l It is an object of the present invention to make such short circuit bridging between the writing electrodes quite harmless by some means-without undue complication.
  • FIG. 1 is a perspective view of the writing head of a visible text writing apparatus, with a symbolic diagram of a writing and grounding circuit connected thereto;
  • FIG. 2 is a similar view of the writing head of a coded spot writing apparatus having auxiliary grounded electrodes arranged between the writing electrodes, and
  • FIG. 3 is a simplified circuit diagram of the circuit to which the writing head of FIG. 1 is connected.
  • FIG. 1 shows the writing head part of a visible text writing apparatus having a number of writing electrodes, 21 arranged one next to the other in a row and insulated from each other by a thin mica sheet.
  • a tape 22 of recording medium of metallized paper is passed underneath the writing electrodes in contact with them in the direction shown by the arrow.
  • the metallized layer of the recording medium, which is in contact with electrodes, is grounded-by a broad electrode 23 that extends across the width of .the layer as it passes beneath the electrode.
  • grounding it is meant, of course, that aconnection is made to a'fixed potential useful as a return potential because it is subject to little or no fluctuation, such as actual ground potential, chassis potentialof an equipment, or the like.
  • the tape 22 runs over a support body 24 by which it is provided with the necessary pressure against the end of the grounding electrode and of the writing electrodes.
  • these writingelectrodes are connected in an electronic circuit 25 by which all are grounded during the pauses between their writing periods, The circuit 25 is shown in more detail in FIG. 3.
  • the writing electrodes may not be short circuited by accumulation of dust or other'part'icles of larger'cross-section, all but the bottom of the front surfaces of the writing electrodes are covered with an insulating layer of 27 of mica and only a narrow cross-section of the electrodes remain uncovered.
  • FIG. 2 shows a writing head for a coded spot writer having 9 writing electrodes 31.
  • the auxiliary electrodes 32 are located between adjacent writing electrodes 31 and are insulated from them by mica sheets. All of the auxiliary electrodes 32 are connected electrically together and grounded.
  • a metallized paper tape 34 passes first under a grounding electrode 35, then over a support body 36 and finally under the writing electrodes 31 of the writing head 30, which are connected'to an electronic circuit 37 of such a kind that a writing voltage is applied to them with respect to the metallized layer in periods in which they are respectively to write on the recording medium by producing a burnout 38 in the metal layer of the recording tape 30, the burnout pulses being provided in accordance with some suitable information code to record intelligence on the tape.
  • FIG. 3 shows in more detail the circuit 25 of FIG. 1.
  • Signals for controlling where the burnout marks should occur are provided from the terminal 50, which is connected to a suitable transmission line or signal generating apparatus and provides signals controlling the relay 54 which intermittently connects a source of negative writing potential 52 through contacts of one of the relays 71, 72, 73 to one of the representative writing electrodes 21a, 21b, 21c
  • the circuit for the writing current is completed through the metal layer 22 and the collective ground electrode 23.
  • the relays 71, 72, 73 are activated sequentially by a rotating switch 56 driven by the motor M, which may be a stepping motor synchronized with the incoming signals by a connection symbollically shown by the dashed line 51.
  • the synchronizing signals may of course be furnished by a conductor separate from that which furnished the signals controlling the relay 52.
  • the respective relays 7'1, 72, 73 are provided with back contactssuch as the contact 58 of the relay 71, for grounding the'corresponding electrode when the relay is not actuated through a contact of the switch 56, the contact arm of each unoperated relay being pressed against the'back contact in the usual way by a restoring spring (not shown).
  • a semiconductor switching circuit may be used to provide the same switching functions and that the rotary switch 56 and the motor M may likewise be replaced by a semiconductor counting chain and associated circuits in the well-known way.
  • Electromagnetic circuits are shown in FIG. 3 for simplicity of illustration.
  • the current limiting the resistor 53 is of a magnitude such as to permit current to be passed between one of the electrode 21 and the metal layer 22 sufficient to produce a burnout.
  • a short circuit occurs between an activated electrode and a grounded electrode the current limiting effect of the resistor 53 is sufficient to prevent an are from being formed which would spread the burnout, but if an additional resistance is desired, to assure clearing the short circuit without formation of a side arc, a resistance may be interposed in the conductor 59.
  • Apparatus for writing on a recording medium having a metallic layer subject to electrical burnout marking on a carrier web which apparatus comprises:
  • circuit means for applying a burnout voltage during writing periods and a grounding potential during a non-writing period to the respective writing electrodes (21,31) and for applying a grounding potential continuously to the metallic layer along a line substantially equally spaced from said writing electrodes, and

Landscapes

  • Electronic Switches (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Facsimile Heads (AREA)
US467891A 1973-05-10 1974-05-08 Electrographic writing apparatus for a metallized strip recording medium using grounded electrodes between writing electrodes Expired - Lifetime US3911447A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2323484A DE2323484C2 (de) 1973-05-10 1973-05-10 Registrier- und Schreibgerät

Publications (1)

Publication Number Publication Date
US3911447A true US3911447A (en) 1975-10-07

Family

ID=5880441

Family Applications (1)

Application Number Title Priority Date Filing Date
US467891A Expired - Lifetime US3911447A (en) 1973-05-10 1974-05-08 Electrographic writing apparatus for a metallized strip recording medium using grounded electrodes between writing electrodes

Country Status (7)

Country Link
US (1) US3911447A (it)
JP (1) JPS5935231B2 (it)
DE (1) DE2323484C2 (it)
FR (1) FR2229223A5 (it)
GB (1) GB1469692A (it)
IT (1) IT1012221B (it)
NL (1) NL7406246A (it)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063255A (en) * 1975-07-10 1977-12-13 International Business Machines Corporation Electro erosion printing head
US4170779A (en) * 1977-05-02 1979-10-09 International Business Machines Corporation Print head electrode for metal paper printers
US4195937A (en) * 1977-09-19 1980-04-01 Termcom, Inc. Electroresistive printing apparatus
US4258374A (en) * 1978-10-21 1981-03-24 J. Hengstler K. G. Electrically operated device for marking metal-coated paper
WO1982003699A1 (en) * 1981-04-24 1982-10-28 Kaye Stanton Title edge apparatus for serially produced collated copy

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2544760C2 (de) * 1975-10-07 1985-06-05 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Schaltungsanordnung zur Ansteuerung eines elektrosensitiven Schreibwerkes
DE10030164A1 (de) * 2000-06-20 2002-01-03 Heidelberger Druckmasch Ag Vorrichtung zum Aufzeichnen eines Elektrostatischen Musters und Verfahren zum Reinigen eines Elektrografischen Schreibkopfes

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3074066A (en) * 1960-02-11 1963-01-15 Radiation Inc Spark burning recorder
US3626422A (en) * 1969-07-28 1971-12-07 Varian Associates Electrographic-writing head having a preponderance of conductive portions engaging the recording medium
US3831178A (en) * 1973-02-05 1974-08-20 Muirhead Inc Electrostatic marking system with a load stabilized power supply

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1524340C3 (de) * 1966-10-21 1974-08-29 Robert Bosch Gmbh, 7000 Stuttgart Zum Erstellen von Markierungen dienendes Gerät
JPS5233050B2 (it) * 1971-11-24 1977-08-25

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3074066A (en) * 1960-02-11 1963-01-15 Radiation Inc Spark burning recorder
US3626422A (en) * 1969-07-28 1971-12-07 Varian Associates Electrographic-writing head having a preponderance of conductive portions engaging the recording medium
US3831178A (en) * 1973-02-05 1974-08-20 Muirhead Inc Electrostatic marking system with a load stabilized power supply

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063255A (en) * 1975-07-10 1977-12-13 International Business Machines Corporation Electro erosion printing head
US4170779A (en) * 1977-05-02 1979-10-09 International Business Machines Corporation Print head electrode for metal paper printers
US4195937A (en) * 1977-09-19 1980-04-01 Termcom, Inc. Electroresistive printing apparatus
US4258374A (en) * 1978-10-21 1981-03-24 J. Hengstler K. G. Electrically operated device for marking metal-coated paper
WO1982003699A1 (en) * 1981-04-24 1982-10-28 Kaye Stanton Title edge apparatus for serially produced collated copy

Also Published As

Publication number Publication date
IT1012221B (it) 1977-03-10
DE2323484C2 (de) 1983-10-06
NL7406246A (it) 1974-11-12
FR2229223A5 (it) 1974-12-06
JPS5935231B2 (ja) 1984-08-27
DE2323484A1 (de) 1974-11-21
JPS5017719A (it) 1975-02-25
GB1469692A (en) 1977-04-06

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