US3744611A - Electro-thermic printing device - Google Patents

Electro-thermic printing device Download PDF

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Publication number
US3744611A
US3744611A US3744611DA US3744611A US 3744611 A US3744611 A US 3744611A US 3744611D A US3744611D A US 3744611DA US 3744611 A US3744611 A US 3744611A
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layer
ink
resistive layer
ribbon
electrodes
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L Montanari
F Knirsch
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OLIVETTI SpA
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OLIVETTI SpA
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41MPRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382Contact thermal transfer or sublimation processes
    • B41M5/3825Electric current carrying heat transfer sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/315Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material
    • B41J2/32Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads
    • B41J2/325Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of heat to a heat sensitive printing or impression-transfer material using thermal heads by selective transfer of ink from ink carrier, e.g. from ink ribbon or sheet

Abstract

An electrothermal printer for non-impact printing on plain paper which makes use of a ribbon which is made up of a substrate having a thermal transferrable ink coated on the surface towards the plain paper and a coating of electrically resistive material on the other side. The ribbon is held in contact with the paper while a plurality of selectively energizable electrodes are held in contact with the resistive material coated side of the ribbon. The electrodes are selectively energized for causing a current to pass through an incremental portion of the resistive material to another electrode which is held in contact with said resistive material a short distance from said selectively energizable electrodes. The current in the incremental portion of the resistive material causes enough I2R heating to soften the wax coated on the substrate directly opposite to the heated portion. The softened ink transfers to the plain paper sheet as a dot or a line.

Description

United States Patent 1191 Montanari et al. July 10, 1973 [54] ELECTRO-THERMIC PRINTING DEVICE 2,917,996 12/1959 Epstein et a1. 346/76 R 3,509,980 5/1970 Lou h t al... 346 76 R X Inventors: 3: 3 3,453,648 7/1969 swing? 3 16/76 R 9 1 73 Assignee: Ing. c. Olivetti & c., S.p.A., lvrea Primary EmminerfEdgflr r (T -i 5 Att0rneyB1rch, Swindler, McKie & Beckett [21] Appl. No.: 104,893 An electrothermal printer for non-impact printing on plain paper which makes use of a ribbon which is made up of a substrate having a thermal transferrable ink [30] Forelgn Apphcauon Pnomy Data coated on the surface towards the plain paper and a Jan. 9, 1970 Italy 67046 A/70 coating of electrically resistive material on the other side. The ribbon is held in contact with the paper while 2% 1 3'' 76 d 346/5135 a plurality of selectively energizable electrodes are held f in contact with the resistive material coated side of the 0 arc l ribbon. The electrodes are selectively energized for causing a current to pass through an incremental por- 5 6 R t d tion of the resistive material to another electrode which l e erences is held in contact with said resistive material a short dis- UNITED STATES PATENTS tance from said selectively energizable electrodes. The 3,596,055 7/1971 Elston 346/76 R X current in the incremental portion of the resistive mate- 2,858,633 11/1958 Kane 346/76 R X rial causes enough 1 R heating to soften the wax coated 3,442,699 5/1969 Dalton 346/135 X on the substrate directly pposite to the heated portior g f gfgfi The softened ink transfers to the plain paper sheet as els 3,419,886 12/1968 Ortlieb 346/76 x a a 3,555,241 1/1971 Carlsen.... 346/76 R X 5 Claims, 5 Drawing Figures It N MW R 29 y// /////A 1/ 1s 28 PATENIELJUL 1 01973 14451 1 SHEET 1 0F 2 INVENTORS LUCIO MONTANARI FRANCO mmscu BY W YQLMJN EYS ATTORN ELECTRO-TIIERMIC PRINTING DEVICE CROSS-REFERENCE TO RELATED APPLICATION The convention priority application for this invention is Italian application No. 67046-A/70 filed on Jan. 9, 1970.

BACKGROUND OF THE INVENTION The present invention refers generally to non-impact printing systems, and more specifically to an electrothermic printing device, wherein a thermotransferable ink layer is printed on a receiving surface in areas where the ink is softened by a source of thermal energy.

Many thermal printing devices are known which print on plain paper whereon is superimposed a sheet coated with a pigmented and thermotransfereable layer, which layer is locally softened by heat transfer apparatus receiving exact registration, and which then adheres to the paper. One thermal printer uses as heat transfer apparatus a modulated electronic beam, which requires complex and bulky equipment not suitable, for example, for an office printing machine.

Another thermal printer uses a sheet having a resis tive layer, a low resistance substrate and a pigmented wax layer, in contact with the receiving sheet. A voltage is applied between a point of the resistive layer and the substrate edge by means of an electrode, which voltage causes a current to flow between the point and the substrate edge through a portion of the substrate having a variable length. The PR heating in the segment having a relatively high resistance causes the wax to melt. This device has the disadvantage that, by changing the electrode position, it changes the circuit resistance, and therefore the current rate, which in some positions will be such as not to melt the wax while in others it will be such as to cuase excessive melting. Furthermore, if a plurality of electrodes operate simultaneously, the currents in the substrate are added and can produce enough IR heating to cause printing where it is undesired.

A further thermal printer uses a metal sheet of high conductivity superimposed on a thermotransferable ink layer which is in turn superimposed on plain paper sheet. An electrode of a different metal is pressed on the high conductivity sheet, which electrode is transversely displaceable on the sheet and connected to a generator of electric voltage. When the electrode is dis-.

placed while voltage is applied a current flows therethrough, which heats the ink lying below. This device, however, requires high rated currents; furthermore, since it is based upon the junction effect, it requires a system capable of holding the stylus at a constant pressure against the sheet of high conductivity material, it being required that the electric characteristics of the junction do not change with the stylus position.

SUMMARY OF THE INVENTION corresponding limited portion of the resistive layer sufficient I R heating for locally softening the therrnotransferable ink.

BRIEF DESCRIPTION OF THE DRAWINGS DETAILED DESCRIPTION In FIG. 1 there is schematically illustrated a typewriter which includes a printing device according to the invention. The machine comprises a usual alphanumeric keyboard 11 which controls, by means of a coding device of known type (not shown) a printing head 13. Head 13 is mounted on a carriage 14 which is stepby-step transversely displaceable with respect to the machine by means of a guiding system (not shown). The head 13 presses a special typewriter ribbon 16 on a platen 19. The ribbon 16 is unwound from a payout reel 17 and is wound on a take-up reel 18 by means of a system commonly used in the typewriters. The paper 21, which is to be printed upon, is fed between the platen 19 and theribbon 16.

As shown in FIGS. 2 and 3, the head 13 includes a metal plate 22 whereon is provided a slot 23. Fitted into a projection 24 of the plate 22 are a plurality of L- shaped electrodes 25, for example, five, which are insulated from the plate 22. The shorter legs of the electrodes 25 are inserted into the slot 23 of the plate 22 so as not to contact it, and bear against the ribbon l6. Selectively applied between each of the electrodes 25 and the plate 22 is a voltage from the coding devices controlled by the keyboard 1 1. In FIG. 4 there is represented a section of head 13, of ribbon 16 and of paper 21. The thickness of ribbon 16 is exaggerated for sake of illustration.

The ribbon 16 comprises a flexible insulating substrate 26, for example, of paper, cotton, silk, polyethylene, etc., coated with a resistive layer 27 on the side facing the printing head 13, and a thermotransferable ink layer 28 on the side facing the paper 21. The resistive layer 27 may be a coat of varnish containing conductive pigments such as graphite or conductive carbon black and metal particles. In order to improve the characteristics of the layer, auxiliary agents as plasticizers, dispersants and stabilizers may be added to the varnish.

For satisfactory operation of the printer the resistivity of the layer 27 should be between approximately 50 ohms per square and 1,000 ohms per square. An example of a mixture for a conductive varnish which for a 10 1. thick layer has a resistivity of 800 ohms per square is the following:

Vinilyte Carbon Black 60 grs grs Conductex DOP (Massimiliano Massa) l grs Raybo 6 (Raybo Chemical Co.) 3 grs MEC (RP. Erba) 100 grs In the event of polymeric substrates 26 the conductive additives may be mixed in the same plastic which, when extruded, forms a conductive ribbon.

The thermotransferable ink 28 that is coated on the substrate 26 is made of a binding means colored with pigments or dyes, or both, suitable to melt at a welldetermined melting point, to be transferred by pressure onto the paper 21, and to solidify as soon as heating is discontinued. The ink should be such as not to be transferable at room temperature by means of pressure alone. To this end there have been found to be useful vynil chloride acetate copolymers, butadiene-styrene polymers, acrylic-vynilic copolymers, terpene polymers, etc.

The ink should also include such auxiliary agents as plasticizers, dispersing means and stabilizers.

When the voltage is applied between an electrode 25 and the platen 22, the current paths 31 take up the pattern represented in FIG. 4. The current density is greater near the electrode 25, where the highest IR heating occurs. The heat is transmitted by conduction through the substrate 26 to the thermotransferable ink 28 which accordingly melts and is transferred to the paper 21. The adhesion of the ink 28 to the paper 21 is aided by the pressure the plate 22 exerts between the ribbon 16, the paper 21, and the platen 19 in the next character spacing. Since the ribbon is stationary during the character spacing of the head 13 across the line. with respect to the paper, no quick cooling of the ink is required.

Upon striking a key on the keyboard '11, a voltage is selectively applied to the electrodes 25 of the head 13, whereupon dots corresponding to the energized electrodes are recorded on the paper 21. Subsequently the head 13 is advanced and another column of dots are selectively recorded on the paper 21, and so forth throughout five feeding steps. The selected character is in this way printed by means of a matrix of dots.

In FIG. is represented a different embodiment of the device according to the invention, using a ribbon l6 comprising'a resistive layer 27 of the type as previously described, a flexible highly conductive substrate 29 (for example, of alluminum or in any case of a material combining high flexibility, mechanical resistance and good electric conductivity features) and a thermotransferable ink layer 28. When a voltage is applied between an electrode 25 and the plate 22 the current paths 32 proceed through the resistive layer 27, along a line which is parallel to the electrodes 25, and in the highly conductive substrate 29 following a segment which is perpendicular to the first. Comparing FIG. 5 with FIG. 4, it is noted that in this second ribbon embodiment the area of the highest current path concentration, and therefore the highest heat dissipation, is located at the electrodes 25. In this way the recorded dots are better defined than in the foregoing ribbon. With a ribbon of this type it is also possible to print full characters, by the use of electrodes formed as characters, located, for example, along the periphery of a cylinder having its axis parallel to the ones of the platen 19, and by a character selection device of a known type.

We claim:

1. Electrothermal printing apparatus for printing with thermally transferable ink on a receiving surface comprising:

an ink layer of thermally transferable ink, said ink layer being immediately adjacent said receiving surface;

means for heating an isolated region of said thermally transferable ink layer so as to transfer ink to said surface; said heating means including:

a printing head having at least two electrodes of different electrical potential;

I a conducting layer for conducting electrical current from one to the other of said electrodes attached to said ink layer, a resistive layer attached to said conducting layer, said resistive layer, said conducting layer and said ink layer forming an integral ribbon, said printing head, said ribbon and said receiving surface being movable with respect to each other;

said two electrodes being spaced a predetermined distance from each other and contacting said resistive layer, to allow current to flow through said conducting layer, the heat generated by said current heating said ink layer.

2. Apparatus according to claim 1 further comprising a second less resistive layer interposed between said ink layer and resistive layer, said electrical current passing from one of said electrodes through said resistive layer into said second resistive layer, through said second resistive layer parallel to'said ink layer, and again through said resistive layer to the other said electrode.

3. Apparatus according to claim 1, wherein said printing head includes:

a row of selectively energizable .points, and

two elongated electrodes parallel to said row and positioned on opposite sides of said row. 4. Electrothermic printing device for printing upon a receiving surface by means of a thermally transferable ink comprising, in combination:

a laminated ribbon comprising:

an ink layer carrying a thermally transferable ink, an insulating layer adjacent to said ink layer, and a resistive layer adjacent to said insulating layer for conducting electrical current, first electrode means comprising an electrode member energizable to a first electrical potential, said electrode member having an elongated opening and a contact surface surrounding said elongated opening, said contact surface engaging said resistive layer, 1

second electrode means comprising a plurality 'of wire probes each selectively energizable to a second electrical potential, said probes being positioned in said elongated opening spaced from one another and from said electrode member, each said probe terminating in a contact point aligned with said contact surface engaging said resistive layer, and

means for moving said ribbon and said receiving sur-' face with respect to said first and second electrode means.

5. Apparatus according to claim 4, wherein said resistive layer comprises a conductive varnish and a support material, said varnish being coated on said support ma- (,5 terial, said support material being attached to said ink layer and said varnish contacting said electrodes.

Claims (4)

  1. 2. Apparatus according to claim 1 further comprising a second less resistive layer interposed between said ink layer and resistive layer, said electrical current passing from one of said electrodes through said resistive layer into said second resistive layer, through said second resistive layer parallel to said ink layer, and again through said resistive layer to the other said electrode.
  2. 3. Apparatus according to claim 1, wherein said printing head includes: a row of selectively energizable points, and two elongated electrodes parallel to said row and positioned on opposite sides of said row.
  3. 4. Electrothermic printing device for printing upon a receiving surface by means of a thermally transferable ink comprising, in combination: a laminated ribbon comprising: an ink layer carrying a thermally transferable ink, an insulating layer adjacent to said ink layer, and a resistive layer adjacent to said insulating layer for conducting electrical current, first electrode means comprising an electrode member energizable to a first electrical potential, said electrode member having an elongated opening and a contact surface surrounding said elongated opening, said contact surface engaging said resistive layer, second electrode means comprising a plurality of wire probes each selectively energizable to a second electrical potential, said probes being positioned in said elongated opening spaced from one another and from said electrode member, each said probe terminating in a contact point aligned with said contact surface engaging said resistive layer, and means for moving said ribbon and said receiving surface with respect to said first and second electrode means.
  4. 5. Apparatus according to claim 4, wherein said resistive layer comprises a conductive varnish and a support material, said varnish being coated on said support material, said support material being attached to said ink layer and said varnish contacting said electrodes.
US3744611A 1970-01-09 1971-01-08 Electro-thermic printing device Expired - Lifetime US3744611A (en)

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Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848720A (en) * 1973-03-05 1974-11-19 Contex Calculators As Pressure spring for a thermoprinter
US3857470A (en) * 1972-05-31 1974-12-31 Battelle Memorial Institute Printer for alphanumeric characters
US3905462A (en) * 1973-02-27 1975-09-16 Olympia Werke Ag Multielectrode electrographic printing device
US3955204A (en) * 1973-10-24 1976-05-04 Triumph Werke Nurnberg A.G. Thermoelectric matrix printing head
US3984809A (en) * 1975-11-20 1976-10-05 Michael L. Dertouzos Parallel thermal printer
US3995729A (en) * 1973-08-07 1976-12-07 Triumph Werke Nurnberg A.G. Impactless printing apparatus
US4064982A (en) * 1976-09-20 1977-12-27 Triumph Werke Nurnberg A.G. Printing ribbon
DE2842772A1 (en) * 1977-10-17 1979-04-26 Ibm Print ribbon for non-impact
US4195937A (en) * 1977-09-19 1980-04-01 Termcom, Inc. Electroresistive printing apparatus
US4236834A (en) * 1978-09-28 1980-12-02 International Business Machines Corporation Electrothermal printing apparatus
EP0021098A2 (en) * 1979-06-29 1981-01-07 International Business Machines Corporation Apparatus for re-inking a ribbon in a thermal transfer printing system
EP0028334A2 (en) * 1979-11-01 1981-05-13 International Business Machines Corporation Method and apparatus for thermally marking a record medium
US4269892A (en) * 1980-02-04 1981-05-26 International Business Machines Corporation Polyester ribbon for non-impact printing
US4291994A (en) * 1980-03-27 1981-09-29 International Business Machines Corporation Tear resistant ribbon for non-impact printing
US4308318A (en) * 1977-12-15 1981-12-29 International Business Machines Corporation Rub resistant ribbon for non-impact printing
US4309117A (en) * 1979-12-26 1982-01-05 International Business Machines Corporation Ribbon configuration for resistive ribbon thermal transfer printing
EP0042950A2 (en) * 1980-06-30 1982-01-06 International Business Machines Corporation Current collector for resistive ribbon printers
US4320170A (en) * 1980-12-08 1982-03-16 International Business Machines Corporation Polyurethane ribbon for non-impact printing
US4345845A (en) * 1981-06-19 1982-08-24 International Business Machines Corporation Drive circuit for thermal printer
EP0059308A2 (en) * 1981-03-02 1982-09-08 International Business Machines Corporation A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon
US4350449A (en) * 1980-06-23 1982-09-21 International Business Machines Corporation Resistive ribbon printing apparatus and method
FR2506224A1 (en) * 1981-05-19 1982-11-26 Ricoh Kk Method and percussion without recording device
FR2506678A1 (en) * 1981-05-26 1982-12-03 Ricoh Kk Method and recording electrothermal without percussion device
US4384797A (en) * 1981-08-13 1983-05-24 International Business Machines Corporation Single laminated element for thermal printing and lift-off correction, control therefor, and process
EP0082269A1 (en) * 1981-12-22 1983-06-29 International Business Machines Corporation Intermediate layer of silicon dioxide in thermal taransfer ribbon
US4396308A (en) * 1981-08-13 1983-08-02 International Business Machines Corporation Ribbon guiding for thermal lift-off correction
EP0088156A1 (en) * 1982-03-10 1983-09-14 International Business Machines Corporation Resistive ribbon for thermal transfer printing
US4408908A (en) * 1980-12-19 1983-10-11 International Business Machines Corporation Ribbon feed system for a matrix printer
US4421429A (en) * 1981-12-22 1983-12-20 International Business Machines Corporation Resistive substrate for thermal printing ribbons comprising a mixture of thermosetting polyimide, thermoplastic polyimide, and conductive particulate material
US4484200A (en) * 1981-06-19 1984-11-20 Ricoh Company, Ltd. Non-impact recording apparatus
EP0129379A2 (en) * 1983-06-09 1984-12-27 Matsushita Electric Industrial Co., Ltd. Media and method for printing
US4491432A (en) * 1982-12-30 1985-01-01 International Business Machines Corporation Chemical heat amplification in thermal transfer printing
US4491431A (en) * 1982-12-30 1985-01-01 International Business Machines Corporation Metal-insulator resistive ribbon for thermal transfer printing
US4547088A (en) * 1980-06-26 1985-10-15 International Business Machines Corporation Correctable thermal transfer printing ribbon
US4549824A (en) * 1983-12-30 1985-10-29 International Business Machines Corporation Ink additives for efficient thermal ink transfer printing processes
US4556891A (en) * 1983-03-18 1985-12-03 Kabushiki Kaisha Suwa Seikosha Printing apparatus and method
US4558963A (en) * 1982-08-30 1985-12-17 International Business Machines Corporation Feed rates and two-mode embodiments for thermal transfer medium conservation
US4568621A (en) * 1983-02-28 1986-02-04 International Business Machines Corporation Thermal transfer printing processes with electroerosion and materials therefor
US4572684A (en) * 1980-01-07 1986-02-25 Fuji Kagakushi Kogyo Co., Ltd. Heat-sensitive color transfer ribbon
US4588315A (en) * 1982-02-13 1986-05-13 Fuji Kagakushi Kogyo Co., Ltd. Heat-sensitive color transfer recording media and printing process using the same
US4661393A (en) * 1981-03-31 1987-04-28 Fujitsu Limited Ink compositions and ink sheets for use in heat transfer recording
US4684271A (en) * 1986-01-15 1987-08-04 Pitney Bowes Inc. Thermal transfer ribbon including an amorphous polymer
US4687360A (en) * 1986-01-15 1987-08-18 Pitney Bowes Inc. Thermal imaging ribbon including a partially crystalline polymer
US4692044A (en) * 1985-04-30 1987-09-08 International Business Machines Corporation Interface resistance and knee voltage enhancement in resistive ribbon printing
US4704616A (en) * 1983-10-05 1987-11-03 Seiko Epson Kabushiki Kaisha Apparatus for electrothermal printing
JPS6327346U (en) * 1986-08-06 1988-02-23
US4770552A (en) * 1986-03-27 1988-09-13 Tokyo Electric Co., Ltd. Printing apparatus for accentuating the outline portion of a printed character
US4983992A (en) * 1989-06-20 1991-01-08 Teikoku Piston Ring Co., Ltd. Printing head for resistive ribbon type printing apparatus
US5070343A (en) * 1989-08-28 1991-12-03 Teikoku Piston Ring Co., Ltd. Printing head for resistive ribbon type printing apparatus
US5106695A (en) * 1990-06-13 1992-04-21 Presstek, Inc. Method and means for producing color proofs
US5482386A (en) * 1992-06-26 1996-01-09 Francotyp-Postalia Gmbh Selection circuit for an electro-thermal printer with a resistance-type ribbon

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DE2755242C3 (en) * 1976-12-13 1981-06-25 Mitsubishi Denki K.K., Tokyo, Jp
GB2010515B (en) * 1977-12-15 1982-04-15 Ibm Ribbon for non-impact printing
DE3270426D1 (en) * 1981-09-21 1986-05-15 Olivetti & Co Spa Thermosensitive inked element for non-impact printers
DE3248178C2 (en) * 1982-12-27 1987-02-19 Forschungsgesellschaft Druckmaschinen E.V., 6000 Frankfurt, De
DE4228765C2 (en) * 1992-08-28 1998-04-09 Francotyp Postalia Gmbh Pressing apparatus for a franking machine having an electrothermal printing device

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3857470A (en) * 1972-05-31 1974-12-31 Battelle Memorial Institute Printer for alphanumeric characters
US3905462A (en) * 1973-02-27 1975-09-16 Olympia Werke Ag Multielectrode electrographic printing device
US3848720A (en) * 1973-03-05 1974-11-19 Contex Calculators As Pressure spring for a thermoprinter
US3995729A (en) * 1973-08-07 1976-12-07 Triumph Werke Nurnberg A.G. Impactless printing apparatus
US3955204A (en) * 1973-10-24 1976-05-04 Triumph Werke Nurnberg A.G. Thermoelectric matrix printing head
US3984809A (en) * 1975-11-20 1976-10-05 Michael L. Dertouzos Parallel thermal printer
US4064982A (en) * 1976-09-20 1977-12-27 Triumph Werke Nurnberg A.G. Printing ribbon
US4195937A (en) * 1977-09-19 1980-04-01 Termcom, Inc. Electroresistive printing apparatus
DE2842772A1 (en) * 1977-10-17 1979-04-26 Ibm Print ribbon for non-impact
US4308318A (en) * 1977-12-15 1981-12-29 International Business Machines Corporation Rub resistant ribbon for non-impact printing
US4236834A (en) * 1978-09-28 1980-12-02 International Business Machines Corporation Electrothermal printing apparatus
EP0021098A2 (en) * 1979-06-29 1981-01-07 International Business Machines Corporation Apparatus for re-inking a ribbon in a thermal transfer printing system
EP0021098A3 (en) * 1979-06-29 1981-11-11 International Business Machines Corporation Apparatus for re-inking a ribbon in a thermal transfer printing system
EP0028334A2 (en) * 1979-11-01 1981-05-13 International Business Machines Corporation Method and apparatus for thermally marking a record medium
EP0028334A3 (en) * 1979-11-01 1982-12-29 International Business Machines Corporation Method and apparatus for thermally marking a record medium
US4309117A (en) * 1979-12-26 1982-01-05 International Business Machines Corporation Ribbon configuration for resistive ribbon thermal transfer printing
EP0031453B1 (en) * 1979-12-26 1983-08-17 International Business Machines Corporation Ribbons for thermal transfer printing and methods of printing using such ribbons
US4572684A (en) * 1980-01-07 1986-02-25 Fuji Kagakushi Kogyo Co., Ltd. Heat-sensitive color transfer ribbon
US4269892A (en) * 1980-02-04 1981-05-26 International Business Machines Corporation Polyester ribbon for non-impact printing
US4291994A (en) * 1980-03-27 1981-09-29 International Business Machines Corporation Tear resistant ribbon for non-impact printing
US4350449A (en) * 1980-06-23 1982-09-21 International Business Machines Corporation Resistive ribbon printing apparatus and method
US4547088A (en) * 1980-06-26 1985-10-15 International Business Machines Corporation Correctable thermal transfer printing ribbon
EP0042950A2 (en) * 1980-06-30 1982-01-06 International Business Machines Corporation Current collector for resistive ribbon printers
US4329071A (en) * 1980-06-30 1982-05-11 International Business Machines Corporation Current collector for resistive ribbon printers
EP0042950B1 (en) * 1980-06-30 1984-07-11 International Business Machines Corporation Current collector for resistive ribbon printers
US4320170A (en) * 1980-12-08 1982-03-16 International Business Machines Corporation Polyurethane ribbon for non-impact printing
EP0053671A1 (en) * 1980-12-08 1982-06-16 International Business Machines Corporation Polyurethane ribbon for non-impact printing
US4408908A (en) * 1980-12-19 1983-10-11 International Business Machines Corporation Ribbon feed system for a matrix printer
EP0059308A3 (en) * 1981-03-02 1983-02-09 International Business Machines Corporation A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon
EP0059308A2 (en) * 1981-03-02 1982-09-08 International Business Machines Corporation A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon
US4400100A (en) * 1981-03-02 1983-08-23 International Business Machines Corp. Four layered ribbon for electrothermal printing
US4661393A (en) * 1981-03-31 1987-04-28 Fujitsu Limited Ink compositions and ink sheets for use in heat transfer recording
FR2506224A1 (en) * 1981-05-19 1982-11-26 Ricoh Kk Method and percussion without recording device
FR2506678A1 (en) * 1981-05-26 1982-12-03 Ricoh Kk Method and recording electrothermal without percussion device
US4484200A (en) * 1981-06-19 1984-11-20 Ricoh Company, Ltd. Non-impact recording apparatus
US4345845A (en) * 1981-06-19 1982-08-24 International Business Machines Corporation Drive circuit for thermal printer
US4396308A (en) * 1981-08-13 1983-08-02 International Business Machines Corporation Ribbon guiding for thermal lift-off correction
US4384797A (en) * 1981-08-13 1983-05-24 International Business Machines Corporation Single laminated element for thermal printing and lift-off correction, control therefor, and process
US4421429A (en) * 1981-12-22 1983-12-20 International Business Machines Corporation Resistive substrate for thermal printing ribbons comprising a mixture of thermosetting polyimide, thermoplastic polyimide, and conductive particulate material
US4419024A (en) * 1981-12-22 1983-12-06 International Business Machines Corporation Silicon dioxide intermediate layer in thermal transfer medium
EP0082269A1 (en) * 1981-12-22 1983-06-29 International Business Machines Corporation Intermediate layer of silicon dioxide in thermal taransfer ribbon
US4588315A (en) * 1982-02-13 1986-05-13 Fuji Kagakushi Kogyo Co., Ltd. Heat-sensitive color transfer recording media and printing process using the same
US4470714A (en) * 1982-03-10 1984-09-11 International Business Machines Corporation Metal-semiconductor resistive ribbon for thermal transfer printing and method for using
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Also Published As

Publication number Publication date Type
DE2100611A1 (en) 1971-07-15 application
DE2100611C3 (en) 1978-05-03 grant
DE2100611B2 (en) 1977-09-08 application

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