US3781904A - Apparatus for producing raster dot images - Google Patents

Apparatus for producing raster dot images Download PDF

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Publication number
US3781904A
US3781904A US00222961A US3781904DA US3781904A US 3781904 A US3781904 A US 3781904A US 00222961 A US00222961 A US 00222961A US 3781904D A US3781904D A US 3781904DA US 3781904 A US3781904 A US 3781904A
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US
United States
Prior art keywords
writing electrodes
writing
raster
recording carrier
electrodes
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
US00222961A
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English (en)
Inventor
G Lorenzen
F Firnig
H Bettin
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.)
Olympia Werke AG
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Olympia Werke AG
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Filing date
Publication date
Application filed by Olympia Werke AG filed Critical Olympia Werke AG
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Publication of US3781904A publication Critical patent/US3781904A/en
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Classifications

    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/001—Mechanisms for bodily moving print heads or carriages parallel to the paper surface
    • B41J25/006—Mechanisms for bodily moving print heads or carriages parallel to the paper surface for oscillating, e.g. page-width print heads provided with counter-balancing means or shock absorbers
    • 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 An apparatus for producing images with raster dots on a recording carrier.
  • the recording carrier has a coating which can be modified by writing electrodes to which an electrical voltage can be applied.
  • a transporting member is used to move the recording carrier relative to the writing electrodes.
  • An oscillator imparts an oscillating movement to the writing electrodes, each writing electrode sweeping over a respective area corresponding in size to a raster dot.
  • This invention relates to an apparatus for producing images, such as characters or portions of pictures, with raster dots on a recording carrier.
  • the present invention relates, more particularly, to an apparatus for producing script characters or parts of pictures with raster dots on a recording carrier having a coating which can be modified by a voltage applied selectively to writing electrodes, a relative movement taking place between the recording carrier and the writing electrodes.
  • the coating on the recording carrier is preferably of such a nature that it may be burnt out upon application of voltage to the writing electrodes.
  • nonmechanical writing techniques and methods are used in data processing apparatuses to realize substantially higher writing speeds, noiseless operation and, not the least, a compact and inexpensive structure.
  • Methods in which a specially prepared recording carrier is varied in certain areas on its surface by an electric voltage applied to writing electrodes constitute a major portion of such methods.
  • One particular known method is, for example, the metal burning method.
  • the metal coating of a recording carrier is removed, at selected locations, by the action of the writing electrodes.
  • the recording carrier must not be moved at all or only at a relatively slow speed with respect to the writing electrodes compared to the writing speed, if the writing-electrodes are arranged, for example, over the whole width of a line. This is again necessary in order not to make high writing speed impossible or difficult.
  • an apparatus for producing images with raster dots on a recording carrier by providing an oscillation producing instrumentality'coupled to writing electrodes.
  • the oscillation producing instrumentality causes the writing electrodes to perform an oscillating movement and sweep over a respective area corresponding in size to a raster dot.
  • the recording carrier has a coating which can be modified by the writing electrodes to which an electrical voltage can be applied.
  • a transporting device or the like is provided for effecting a relative movement between the recording carrier and the writing electrodes.
  • An advantage of the apparatus of the present invention is particularly that the oscillating movement produces script characters and picture portions having well defined, sharp outlines on the recording carrier.
  • Writing voltages are required only of such an intensity as is necessary to modify the surface of the recording carrier.
  • the magnitudes of the writing voltages required are within a safe range.
  • the voltages can be supplied to the writing electrodes through simple, low-output electronic components whose insulation breakdown resistance need not meet high demands.
  • the oscillating movement is produced by oscillators which are excitable by the effect of an electrical or magnetic alternating field.
  • oscillators which are excitable by the effect of an electrical or magnetic alternating field.
  • the use of such oscillators requires only small, inexpensive mechanical and electrical components so that the compact structure of the apparatus can be maintained.
  • FIG. 1 is a pictorial view, partially broken away, of a first embodiment of an apparatus for producing images with raster dots on a recording carrier according to the present invention.
  • FIG. 2 is a pictorial view of a second embodiment of an apparatus for producing images with raster dots according to the present invention.
  • FIG. 3 shows another form of the writing electrodes which may be used in apparatus constructed according to the present invention.
  • a recording carrier 1 having a metal layer on the surface which can be seen in the drawing is transported by a transporting roller 2 at slow speed in the direction of an arrow A.
  • the transporting roller 2 contacts the rear surface of the recording carrier 1.
  • Writing electrodes 3 are in contact with the metal layer on the visible surface of the recording carrier 1.
  • Each of the writing electrodes 3 is provided with a cutting edge 4 extending in the same direction as the raster line to be cut.
  • the supporting arms 6 are made of electrically nonconductive material. Electrical leads 8 to the writing electrodes 3 are designed as printed or etched conductive paths on the three supporting arms 6 and lead via their terminals 9 to a control circuit (not shown). On the side of each of thesupporting arms 6 opposite the writing electrodes 3, a leaf spring 10 is disposed, only one being shown in FIG. 1. Each of the leaf springs 10, with its associated supporting arm 6, is fastened in a mounting ledge 11.
  • the plurality of supporting arms 6, each carrying five writing electrodes 3, are arranged side-by-side in such a number as required by the characters which are to appear in a line.
  • a camshaft 12 rotates below the supporting arms 6 .
  • the camshaft 12 is provided with a cam 13 for each of the supporting arms.
  • the earns 13 cause each of the supporting arms 6 to be deflected once during each revolution of camshaft 12 against one of the leaf springs 10, the degree of the deflection being so dimensioned that the cutting edges 4 of the writing electrodes 3 passes over a height corresponding to the height B of a raster dot on the recording carrier 1.
  • each of the writing electrodes 3 corresponds to the width C of a raster dot
  • a whole area corresponding in size to the size of a raster dot 5 is swept over by the cutting edge 4 of one of the writing electrodes 3 during one revolution of the camshaft, the other cutting edges 4 effectively sweeping arms corresponding in size to the areas of other raster dots.
  • the cams 13 are arranged along the periphery of camshaft 12 in such an offset manner that the supporting arms 6 are deflected in succession.
  • This produces the possibility of charging first the writing electrodes 3 of one of the supporting arms 6 with the control circuit (not shown) while such arm is being deflected by its associated cam 13, but to then, with the same control circuit, already charge the electrodes of the following supporting arm 6 before its deflection has been initiated.
  • the writing electrodes 3 of all of the supporting arms 6 are charged in succession by the same, rapidly working control circuit during one revolution of the camshaft 12 and a raster line of all characters across the width of the recording carrier 1 is produced.
  • an apparatus includes a plurality of writing electrodes 15 also combined into groups of 5, but arranged on an electrically nonconductive carrier 16 which is common to all of the writing electrodes 15 across the width of the recording carrier 1. Moreover, cutting edges 17 of the writing electrodes 15 are perpendicularly aligned, their length corresponding to the height B of a raster dot.
  • the carrier 16 is mounted to be displaceable in the direction of the raster line in a pair of guides shown diagrammatically at 18 and is caused to oscillate by an oscillator 19.
  • the oscillator 19 may be, for example, a generally known magnetostrictive, electrostrictive or piezoelectric transducer which is caused to oscillate by a magnetic or an electrical alternating field.
  • the oscillator 19 shown in FIG. 2 could be a quartz crystal oscillating at the alternating voltage frequency applied by an alternating voltage source 20 to the plates (not shown) of the transducer.
  • the frequency of the alternating voltage is so selected that it coincides with the natural frequency of the quartz crystal. In this way the highest'possible oscillation amplitude is produced with the lowest possible energy consumption.
  • the resulting oscillating movement is transmitted to the carrier 16 which moves the writing electrodes 15 with a stroke of such magnitude that a width corresponding to the width of a raster dot is swept by each of the writing electrodes 15.
  • the switching frequency ofa control circuit (not shown) from one group of electrodes 21 to the following group of electrodes 22 can be identical with the frequency of the quartz crystal oscillator 19 so that the formation of a raster line for a character is effected during one stroke of the carrier 16.
  • the oscillating frequency of the quartz crystal oscillator 19 can also be selected to be substantially higher than the switching frequency of the control circuit.
  • FIG. 3 shows an electrode and carrier arrangement using a type of writing electrode whose writing surface 25, which at least in the writing range, corresponds to the shape of a raster dot.
  • each of the writing electrodes 23 is provided with a lead 9 suitable for connecting each writing electrode to a control circuit (not shown) which provides input voltage signals.
  • a further improvement of the raster image i.e., uniform burning of the metal coating on the recording carrier (not shown in FIG. 3) with sharper outlines can be additionally attained in that the roughness of the electrode writing surface 25 is selected to be substantially equal to the average roughness value of the recording carrier metal coated surface.
  • a type of meshing is produced during the writing process between the writing surface 25 of each of the writing electrodes 23 and the recording carrier.
  • each supporting arm carrying a plurality of said writing electrodes
  • each cam being operatively coupled to a separate one of said supporting arms, said supporting arms being deflected in succession upon rotation of said camshaft for causing said writing electrodes to perform an oscillating movement and sweep over respective areas corresponding in size to areas of respective raster dots while electric voltage is applied to said writing electrodes, said writing electrodes being supplied with electrical voltage in sequence from a single source.
  • An arrangement as defined in claim 1 further comprising spring means, and wherein said writing electrodes have the width corresponding to the width of a raster dot; said supporting arms are mounted to be pivotal against the force of said spring means to cause an given raster field.
US00222961A 1971-05-12 1972-02-02 Apparatus for producing raster dot images Expired - Lifetime US3781904A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2123558A DE2123558B2 (de) 1971-05-12 1971-05-12 Elektrographischer Drucker zum Herstellen von Schriftzeichen öder Bildteilen

Publications (1)

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US3781904A true US3781904A (en) 1973-12-25

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US00222961A Expired - Lifetime US3781904A (en) 1971-05-12 1972-02-02 Apparatus for producing raster dot images

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DE (1) DE2123558B2 (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891991A (en) * 1972-10-02 1975-06-24 Bosch Gmbh Robert Recording apparatus with improved counterelectrode
US3997903A (en) * 1974-12-06 1976-12-14 Kienzle Apparate Gmbh Electrographical recording system
US4087827A (en) * 1975-10-09 1978-05-02 U.S. Philips Corporation Electrode and multi-electrode recording head for a graphic recording apparatus
US4230938A (en) * 1978-02-21 1980-10-28 Centurion Data Corporation Computer input/output device
US4307406A (en) * 1978-05-05 1981-12-22 Bell & Howell Company Multistyli recording systems
EP0539812A2 (de) * 1991-10-31 1993-05-05 Hewlett-Packard Company Nockenantriebsmechanismus für Druckkassette
EP0540987A2 (de) * 1991-11-04 1993-05-12 Hewlett-Packard Company Grossbereich-Drucker/Schreiber mit mehreren Schreibkassetten
US20090013659A1 (en) * 2006-01-13 2009-01-15 Emitec Gesellschaft Fur Emissionstechnologie Mbh Apparatus and Method for Discontinuous Welding of Metallic Fibers, Method for Filtering Exhaust Gases and Exhaust-Gas Treatment Component
US20170216863A1 (en) * 2014-10-31 2017-08-03 Yoshino Kogyosho Co., Ltd. Trigger-type liquid ejector

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5783471A (en) * 1980-11-14 1982-05-25 Canon Inc Thermal copying printer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US626848A (en) * 1899-06-13 Joseph wills
US3016278A (en) * 1957-11-30 1962-01-09 Kienzle Apparate Gmbh Recorder mechanism
US3369250A (en) * 1965-07-15 1968-02-13 Thomas H. Gifft Facsimile recording device
US3534382A (en) * 1966-11-12 1970-10-13 Bosch Gmbh Robert Recording apparatus using a metallized recording medium
US3644931A (en) * 1968-09-10 1972-02-22 New Zealand Inventions Dev Multistyli recorders with styli cyclically moved through interstylus spacing

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US626848A (en) * 1899-06-13 Joseph wills
US3016278A (en) * 1957-11-30 1962-01-09 Kienzle Apparate Gmbh Recorder mechanism
US3369250A (en) * 1965-07-15 1968-02-13 Thomas H. Gifft Facsimile recording device
US3534382A (en) * 1966-11-12 1970-10-13 Bosch Gmbh Robert Recording apparatus using a metallized recording medium
US3644931A (en) * 1968-09-10 1972-02-22 New Zealand Inventions Dev Multistyli recorders with styli cyclically moved through interstylus spacing

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3891991A (en) * 1972-10-02 1975-06-24 Bosch Gmbh Robert Recording apparatus with improved counterelectrode
US3997903A (en) * 1974-12-06 1976-12-14 Kienzle Apparate Gmbh Electrographical recording system
US4087827A (en) * 1975-10-09 1978-05-02 U.S. Philips Corporation Electrode and multi-electrode recording head for a graphic recording apparatus
US4230938A (en) * 1978-02-21 1980-10-28 Centurion Data Corporation Computer input/output device
US4307406A (en) * 1978-05-05 1981-12-22 Bell & Howell Company Multistyli recording systems
EP0539812A2 (de) * 1991-10-31 1993-05-05 Hewlett-Packard Company Nockenantriebsmechanismus für Druckkassette
EP0539812A3 (en) * 1991-10-31 1993-09-29 Hewlett-Packard Company Print cartridge cam actuator linkage
US5488397A (en) * 1991-10-31 1996-01-30 Hewlett-Packard Company Wide-swath printer/plotter using multiple printheads
EP0540987A2 (de) * 1991-11-04 1993-05-12 Hewlett-Packard Company Grossbereich-Drucker/Schreiber mit mehreren Schreibkassetten
EP0540987A3 (en) * 1991-11-04 1993-09-22 Hewlett-Packard Company Wide-swath printer/plotter using multiple pen cartridges
US20090013659A1 (en) * 2006-01-13 2009-01-15 Emitec Gesellschaft Fur Emissionstechnologie Mbh Apparatus and Method for Discontinuous Welding of Metallic Fibers, Method for Filtering Exhaust Gases and Exhaust-Gas Treatment Component
US20170216863A1 (en) * 2014-10-31 2017-08-03 Yoshino Kogyosho Co., Ltd. Trigger-type liquid ejector

Also Published As

Publication number Publication date
DE2123558A1 (de) 1972-11-30
DE2123558B2 (de) 1973-11-22

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