US3291276A - Print head having cup shaped protective member - Google Patents

Print head having cup shaped protective member Download PDF

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Publication number
US3291276A
US3291276A US452215A US45221565A US3291276A US 3291276 A US3291276 A US 3291276A US 452215 A US452215 A US 452215A US 45221565 A US45221565 A US 45221565A US 3291276 A US3291276 A US 3291276A
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US
United States
Prior art keywords
electrodes
printing
tape
styli
pin
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Expired - Lifetime
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US452215A
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English (en)
Inventor
James F Milne
Philip E Norgren
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Unisys Corp
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Sperry Rand Corp
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Publication date
Application filed by Sperry Rand Corp filed Critical Sperry Rand Corp
Priority to US452215A priority Critical patent/US3291276A/en
Priority to NL6605208A priority patent/NL6605208A/xx
Priority to GB17548/67A priority patent/GB1132302A/en
Priority to BE680006D priority patent/BE680006A/xx
Priority to FR59122A priority patent/FR1477328A/fr
Application granted granted Critical
Publication of US3291276A publication Critical patent/US3291276A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41J2/39—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 using multi-stylus heads
    • B41J2/395—Structure of multi-stylus heads
    • 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

  • the invention relates in general to printing apparatus and more particularly to an improvement in apparatus for printing data electrically on electrosensitive record material.
  • Certain known printing arrangements provide a plurality of styli in a patterned arrangement'capble of producing characters through selective time energization of the styli as the printer is swept across the face of the record material.
  • the styli are physically separated and electrically isolated from each other in a pattern most conducive to the generation of the desired characters.
  • the styli rest directly upon the record material and current is caused to pass from the selected styli through the record material to a ground plate located at the opposite side of the record material, or from one styli through the paper to another styli.
  • the current in passing through the record material causes distinct marks or dots which can be combined through proper timed energization of the styli to form the data to be printed.
  • sixteen individual styli are mounted in a printing head, adapted to reciprocate across the recording material with the styli in contact therewith.
  • the pin-type styli are each electrically insulated from one another and spaced apart into a matrix configurated generally like the digit 8.
  • Each stylus is 3,291,276 Patented Dec. 13, 1966 yieldably mounted in the print head, protrudes therefrom and is biased by a spring into contact with the record material.
  • a cap made from a phenolic or sirnlar material and a gasket are mounted over the end of the print head from which the syli project.
  • the gasket is made from a thermoplastic resin, preferably a plastic of the polytetrafluoro-et'hylene type of fluorocarbon.
  • Teflon The properties of Teflon, which include resistance to high and low temperatures, excellent dielectric properties, high impact strength and low 00- efficient of friction, are well known.
  • This combination of cap and gasket is spring loaded to the print head so that the Teflon gasket during the print operation rides across the face of the recording material.
  • the styli project through the cap and through the Teflon gasket to contact the face of the recording material; however, due to the spring bias on the cap and gasket combination only the cross-sectional ends of the styli are exposed and these are pressed directly onto the record material.
  • the Teflon has very low coeflicient of friction, and a high dielectric strength and the phenolic cap provides a rigid backing to keep the Teflon gasket from distorting. As a result of this effective isolation and support of the individual styli, fouling of the print head is eliminated, insuring good printing qualities of the device over a prolonged period of operation.
  • the provision of the additional gasket and cap about the printing head provides increased support of the styli along substantially their entire length to the very end thereof in contact with the record paper.
  • This added support of the styli material ly increases the stability thereof, improving the print clarity and reducing scratching marks on the paper, noted in connection with prior art arrangements.
  • FIGURE 1 is a simplified schematic view in perspective of portions of a printer in accordance with the invention.
  • FIGURE 2 is a simplified schematic view greatly enlarged of the printing head of FIGURE 1, showing the configuration of the styli matrix;
  • FIGURE 3 is a schematic, cross-sectional view in side elevation and greatly enlarged of a pair of pin styli taken through the printing head of FIGURE 1 and including the improvement of the instant invention, and
  • FIGURE 4 is a perspective view of the print head partly in section
  • FIGURE 5 is a simplified schematic block diagram of the energizing circuits for the printing head of FIGURE 1.
  • a tape conveyor of any conventi-onal design is represented schematically by merely a conveyor roller 332; it being understood that the tape conveyor is adapted to move tape 330 line by line to place successive lines of the tape into printing position; the direction of tape movement being indicated by the directional arrow shown on roller 332.
  • a stylus or printing head 334 is slidably mounted on a guide rod 336 for movement transversely of tape 330 at the printing position.
  • Printing head 334 may be driven by any suitable means from the left edge of tape 330, the initial printing position, to the right edge of the tape during the printing cycle, and then back to the left tape edge, in preparation for printing the next line.
  • Such driven movement is preferably effected at a substantially constant speed by printing head conveying mechanism (not shown) which transmits driven motion to printing head 334 by means of a timing belt 338 attached by fasteners 340 to a printing head 334.
  • roller 332 of the tape conveyor moves tape 330 in the direction of the directional arrow to place the next printing line of tape 330 into printing position. Actuation of roller 332 is effected by the above-mentioned printing head conveying mechanism.
  • Printing head 334 is formed of an electrically nonconductive mate-rial and is provided in the illustrated embodiment with sixteen individual styli assemblies 342 (FIGURE 3), each having a stylus or electrode in the form of a rod-like pin 344.
  • the pins are designated P1 through P16 (FIGURE 2) to differentiate the pins from one another.
  • Styli pins 344 protrude from the bottom of printing head 334, fourteen of which pins (Pl-P14) are arranged into a matrix having the configuration of a digit 8 slightly slanted to the left, as seen in the bottom View of the printing head 334, shown in FIGURE 2.
  • a pair of pins, P15 and P16 are provided for inserting the decimal point designation in the proper position between numerals along the line of print.
  • each styli assembly 342 is formed of conductive material, preferably of tungsten and is slidably disposed in an associated pin hole or channel 348 defined in a bottom portion 352 of printing head 334.
  • Each pin 344 is provided with a sleeve 354 of conductive material, such as stainless steel, which sleeve is press fit onto the upper end of the pin.
  • Sleeve 354 is slidably confined in a channel 356 aligned with channel 348 and defined in an intermediate portion 358 of printing head 334 to permit up and down movement of pin 334 and sleeve 354 in channel 356.
  • a biasing spring 362 of the coil type and of conductive material is provided for each pin 44 and is loosely disposed under compression in the channel 356 provided for its associated pin.
  • Spring 362 presses against sleeve 354 of its associated pin 344, biasing the pin downward to maintain the free or lower end of the pin in constant contact with the upper surface of tape 330.
  • Downward movement of pin 344 is limited by its sleeve 354 abutting a shoulder 364 formed by printing head portion 352 where channel 348 joins channel 356.
  • An electrical connecting lead 366 is provided for each pin 344 and extends through a hole 368 defined in a portion 370 of printing head 334. Each lead 366 enters the channel 356 of its respective pin 344 and is connected electrically to the uppermost portion of the spring 362 in such channel. The leads 366 serve to connect their respective pins 344 (Pl-P16) to the pin energizing circuits.
  • each styli pin 344 is individually spring biased to continually bear upon and frictionally engage the top surface of tape 339, as printing head 334 is driven transversely of the tape.
  • Such individual spring biasing automatically compensates for unevenness of the tape surface and for variation in the wear rates of the individual styli pins 344.
  • this direct contact of the styli pins with the paper surface has a tendency, should the styli pins be exposed from the print head, to pick up fibers from the paper, dust particles and other foreign matter which shortly will cause a fouling of the print head considerably reducing, if not altogether disrupting, the print capability of the arrangement.
  • the instant invention proposes the inclusion of a boot 350 (FIGURE 4) over the print head, which boot consists of a phenolic cap 351 and a Teflon gasket 353.
  • the boot 350 is provided with a plurality of holes, each in substantial alignment with one of the styli pins of the printing head so that the individually spring biased styli pins may protrude through the boot and contact the recording surface 330.
  • the boot 350 is spring loaded with respect to the print head by springs 380 recessed in channels or grooves 381 in the cap 351.
  • the springs 380 act upon pins 382 in contact with the collar 384 surrounding the print head.
  • the bias provided by springs 380 forces the Teflon gasket 353 against the surface of the tape 330 so that the styli pins 344 are completely isolated except for the crosssectional ends which contact the surface of the tape. Since the Teflon gasket is in pressure contact with the tape 330 when the print head assembly is in the print position, the end of the cap and Teflon gasket have a radius comparable to that of the roller 332 so as to insure good contact between the gasket and the paper over the full gasket area.
  • the holes in the cap 350 through which the print pins pass have a dimension only slightly larger than the pins themselves; however, due to the natural lubrication provided by the Teflon material, the pins may very easily slide in and out of the print head in response to pressure by the springs 362 insuring good contact between the pins 344 and the surface of tape 330.
  • the boot 350 is shown as being formed of two separate elements 351 and 353, it is within the purview of the invention to provide the entire boot of a single material such as a fluorocarbon resin with a fi-ller so as to combine the low friction and high dielectric properties of Teflon with low wear and rigidity.
  • the gasket 353 may be made from other materials having properties similar to Teflon.
  • the styli pins 344 are complete-1y surrounded by the boot 350 so that only the cross-sectional end surfaces of the pins are exposed and these firmly contact the surface of tape 330.
  • the record sheet engaging ends of the pins are substantially in the same plane as the outer surface of the Teflon gasket 353.
  • the gasket 353 which follows the record sheet curvature is maintained firmly against the record surface as it and the print head are driven transversely of the record sheet.
  • the Teflon sheet biased against the record surface eliminates the gap which was heretofore present between the print head and the record sheet and in which dust particles accumulated, fouling the pins.
  • the gasket effectively mashes the exploded dust particles of the record sheet surface back into the sheet surface such that no noticeable loose dust particles are formed to foul the pins.
  • the provision of the boot 350 over the print head provides an added support for the styli pins over substantially their entire length to the very ends which contact the record surface 330 resulting in increased stability and more accurate registration of the pins so that greater clarity in printing is achieved and scratching of the surface due to vibrations in the pins is completely eliminated.
  • the configurations of numerals through 9 and some special symbols may be printed upon tape 330 (FIG. 1), as printing head 334- is moved transversely thereto.
  • marking is effected in the preferred embodiment by causing a succession of current pulses to flow from one pin 344 (FIG. 3) along the chemically coated surface of conductive tape 330 to a second pin 344 which is associated with and spaced from the first pin.
  • a pulse of current may be caused to flow successively from P1 along tape 330 to pin P2.
  • Such current flow causes chemically treated tape 33b to darken or change color at the two points where pins P1 and P2 engage the tape surface to provide legible distinct marks thereat, which due to suecessive pulsation thereof may take the form of elongated dots or lines.
  • the electrical pulsing of the pins is substantially instantaneous, such that movement of printing head 334 relative to tape 33% is effectively stopped during printing. This prevents blurring, notwithstanding the relative motion between pin 344 and tape 330 during the printing.
  • the sixteen styli pins 344 (Pl-P16, FIG. 2), comprising the digit 8 styli matrix and a decimal point designation as mentioned above, are electrically connected to the pin energizing circuits in pairs.
  • the pin styli 344 are therefore divided into pin pairs and an electrical styli energizing circuit is provided for each pair of pins (FIGURE).
  • eight pin energizing circuits, or driving circuits 371-378 are utilized for energizing the sixteen pins.
  • the digits 0 and 1 through 9, plus certain symbols, such as the letter C and the decimal point may be printed by causing the driving circuits to successively energize selective pin pair combinations in accordance with a particular time sequence.
  • the driving circuits utilize means in the form of a decoding matrix 383 for detecting the input of certain pin selection signals derived from an input processor.
  • the decoding matrix translates the selection signals and conditions the driving circuits to effect subsequent energization of associated pin pairs or to prevent such energization, as the signals dictate.
  • the detecting means also automatically and continually responds to changes in pin selection as denoted by the selection signals.
  • a print signal causes energization of print initiating means (not shown) which generate initiating or gating signals which are applied simultaneously to all driving circuits via the decoding matrix 383. This causes the driving circuits of the selected pin pair combination to be simultaneously energized to form the desired character on the record medium, while those of the unselected pin pairs are maintained unenergized in accordance with the preconditioned state of the driving circuits.
  • the print initiating signals are in the form of electrical pulses.
  • the printing head 334 is moved at a substantially constant speed transversely of the record tape 330.
  • Selection of the pin pairs to be energized and pulsing of their respective driving circuits are synchronized with transverse movement of the print head such that desired characters are printed sequentially on a print line.
  • energization of selection pin pairs in response to the common print initiating pulses will be sufficiently instantaneous so as to appear to stop relative motion between the print head and record material, producing distinct printed characters on the record material, notwithstanding such relative motion.
  • a printing head having a plurality of styli electrodes in continuous contact with one surface of said tape, said styli electrodes being electrically insulated one from the other, means for moving said printing head in transverse excursions with respect to said tape at said printing station, electric circuit means energizable for selectively causing pulses of current to flow simultaneously from a predetermined combination of said styli electrodes through said tape to produce distinct marks on said record surface, and electrode shielding means surrounding said print head and having a plurality of apertures in alignment with said styli electrodes, through which said electrodes protrude, said electrode shielding means having an outer surface portion in contact with said one surface of said tape, and adapted for slidable engagement therewith during said excursions.
  • An apparatus for printing electrically on electrosensitive record material in the form of a tape which is movable longitudinally past a printing station, a printing head having a plurality of styli electrodes protruding from one end thereof, each of which is electrically insulated one from the other and spaced apart into a styli matrix of predetermined configuration, means for moving said printing head transversely of said tape at said printing station and maintaining a free end portion of each of said styli electrodes in contact with one surface of said tape, electrode energizing means energizable for applying electrical energy simultaneously to selected ones of said styli electrodes to cause current to pass through said selected electrodes through said tape, and electrode shielding means positioned over said one end of said printing head for encasing all of each of said styli electrodes except for the cross-sectional surfaces at said free ends thereof.
  • said electrode shielding means is formed of electrically non-conducting material and has for each of said electrodes a receiving aperture defined therein, and each of said electrodes is slidably mounted in its associated one of said apertures and is provided with means for biasing said cross-sectional end of its associated electrode into engagement with said tape.
  • a printing head having at least two styli electrodes with substantially coplanar end surfaces, said lectrodes being electrically insulated and spaced apart from each other, means for mounting said printing head and adapted to maintain said styli electrodes in a predetermined configuration and in engagement with said record material, and electrodes shielding means slidably positioned over said printing head and substantially enclosing said styli electrodes, said shielding means including an end portion adapted to accommodate said electrodes in engagement with said record material, said end portion having an outer surface substantially coplanar with said coplanar end surfaces and engaging said record material.
  • a stylus printing apparatus for electrically printing on chemically treated record material in the form of a tape which is movable longitudinally past a printing station, a printing head having at least two styli electrodes protruding from one end thereof into continuous contact with a surface of said tape at said printing station, said stylus head being movable transversely of said tape for printing along a transverse line on such tape, electric circuit means energizable for causing pulse of current to flow from a first one of said styli electrodes to the other of said electrodes through said tape producing distinct marks on said tape surface where said electrodes contact said tape surface, insulating cup means positioned over said one end of said printing head with said electrodes protruding through the bottom thereof, the outer surface of the bottom of said cup means being provided with a thermoplastic resin layer, said layer being provided with apertures in alignment with said electrodes, and biasing means for said cup means normally urging said outer surface of the bottom thereof into contact with said tape, such that the tape contacting portion of said electrodes and said outer surface
  • a printing head for stylus printing apparatus capable of printing on chemically treated record material comprising an insulating block, a plurality of parallel spaced electrodes protruding from one end of said block, means for effecting individual electrical connections to said electrodes through said block, and electrode shielding means positioned over said one end of said block and substantially enclosing said electrodes, said shielding means being movable with respect to said block and said electrodes and including biasing means for normally biasing said shelding means outwardly from said block in the direction of extension of said electrodes.
  • said shielding means has a curved surface including said apertures for conforming to the surface of said record material
  • said electrodes are spring biased within said insulating block for axial movement relative to said block and said shielding means.
  • a printing head for stylus printing apparatus capable of printing on chemically treated record material comprising an insulating block, a plurality of parallel spaced electrodes protruding from one end of said block, means for effecting individual electrical connections to said electrodes through said block, and electrode shielding means positioned over said one end of said block and substantially enclosing said electrodes, said shielding means being movable with respect to said block and said electrodes and including biasing means for normally biasing said shelding means outwardly from said block in the direction of extension of said electrodes,
  • said shielding means being cup-shaped and being provided with a plurality of apertures in substantial alignment with said electrodes and accommodating the passage therethrough of said electrodes,
  • said shielding means having a curved surface including said apertures for conforming to the surface of of said record material
  • said curved surface of said shielding means being formed of a material having low friction and high dielectric properties as compared to said electrodes.
  • a printing head for stylus printing apparatus capable of printing on chemically treated record material comprising an insulating block, a plurality of parallel spaced electrodes protruding from one end of said block, means for effecting individual electrical connections to said electrodes through said block, and electrode shielding means positioned over said one end of said block and substantially enclosing said electrodes, said shielding means being movable with respect to said block and said electrodes and including biasing means for normally biasing said shielding means outwardly from said block in the direction of extension of said electrodes,
  • said shielding means being cup-shaped and being provided with a plurality of apertures in substantial alignment with said electrodes and accommodating the passage therethrough of said electrodes,
  • said shielding means having a curved surface including said apertures for conforming to the surface of said record material
  • said shielding means being formed of a rigid insulating cup and a curved outer layer of thermoplastic resin.
  • a printing head for stylus printing apparatus capable of printing on chemically treated record material comprosing an insulating block, a plurality of parallel spaced electrodes protruding from one end of said block, means for effecting individual electrical connection to said electrodes through said block, and electrode shielding means positioned over said one end of said block and substantially enclosing said electrodes, said shielding means being movable with respect to said block and said electrodes and including biasing means for normally biasing said shielding means outwardly from said block in the direction of extension of said electrodes,
  • said shielding means being cup-shaped with a continuous sidewall portion extending from an end portion, and being provided with a plurality of apertures in substantial alignment with said electrodes and accommodating the passage therethrough of said electrodes,
  • said apertures in said shielding means extending through said end portion and having a diameter substantially equal to the diameter of said electrodes.
  • a printing head for stylus printing apparatus capable of printing on chemically treated record material comprising an insulating block, a plurality of parallel spaced electrodes protruding from one end of said block, means for effecting individual electrical connections to said electrodes through said block, and electrode shielding means positioned over said one end of said block and substantially enclosing said electrodes, said shielding means being movable with respect to said block and said electrodes and including biasing means for normally biasing said shielding means outwardly from said block in the direction of extension of said electrodes,
  • said shielding means being cup-shaped with a continuous sidewall portion extending from an end portion, and being provided with a plurality of apertures in substantial alignment with said electrodes and accommodating the passage therethrough of said electrodes,
  • said electrodes being spring biased within said insulating block for axial movement relative to said block and said shielding means
  • said apertures in said shielding means extending through said end portion and having a diameter substantially equal to the diameter of said electrodes.

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US452215A 1965-04-30 1965-04-30 Print head having cup shaped protective member Expired - Lifetime US3291276A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US452215A US3291276A (en) 1965-04-30 1965-04-30 Print head having cup shaped protective member
NL6605208A NL6605208A (enrdf_load_stackoverflow) 1965-04-30 1966-04-19
GB17548/67A GB1132302A (en) 1965-04-30 1966-04-21 Printing apparatus
BE680006D BE680006A (enrdf_load_stackoverflow) 1965-04-30 1966-04-25
FR59122A FR1477328A (fr) 1965-04-30 1966-04-26 Tête d'impression pour un appareil d'impression à styles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US452215A US3291276A (en) 1965-04-30 1965-04-30 Print head having cup shaped protective member

Publications (1)

Publication Number Publication Date
US3291276A true US3291276A (en) 1966-12-13

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ID=23795566

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Application Number Title Priority Date Filing Date
US452215A Expired - Lifetime US3291276A (en) 1965-04-30 1965-04-30 Print head having cup shaped protective member

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US (1) US3291276A (enrdf_load_stackoverflow)
BE (1) BE680006A (enrdf_load_stackoverflow)
GB (1) GB1132302A (enrdf_load_stackoverflow)
NL (1) NL6605208A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405392A (en) * 1965-04-30 1968-10-08 Sperry Rand Corp Electronic calculators
US3742846A (en) * 1972-03-31 1973-07-03 Ibm Wire printer with print head moved in figure eight pattern
US3971042A (en) * 1970-02-25 1976-07-20 Xerox Corporation Writing apparatus having wear resistant material
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
US4136977A (en) * 1976-10-16 1979-01-30 Triumph Werke Nurnberg A.G. Mount for a consumable electrode matrix printer
US4206466A (en) * 1979-03-12 1980-06-03 The United States Of America As Represented By The Secretary Of The Navy Non-fouling print stylus

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1438829A (en) * 1920-06-24 1922-12-12 Gen Electric Recorder
US2404975A (en) * 1942-05-29 1946-07-30 Rca Corp Recording stylus
US2442561A (en) * 1944-02-02 1948-06-01 William G H Finch Stylus
US2647033A (en) * 1952-06-11 1953-07-28 Gen Electric Spark stylus recording apparatus
US2730694A (en) * 1951-02-02 1956-01-10 Ferranti Ltd Amplitude recording system utilizing saturable core reactors
US2743989A (en) * 1952-06-10 1956-05-01 Faximile Inc Facsimile recorder
US2869965A (en) * 1954-12-30 1959-01-20 Ibm Electro-sensitive digital data plotter
US2919171A (en) * 1957-02-27 1959-12-29 Burroughs Corp Page printing apparatus
US2930847A (en) * 1956-11-01 1960-03-29 Rca Corp Printer
US2997361A (en) * 1958-06-25 1961-08-22 Ibm Selective electrostatic character printing
US3012839A (en) * 1954-07-15 1961-12-12 Burroughs Corp Electrographic printer
US3016612A (en) * 1958-04-17 1962-01-16 Ibm Recording device
US3047872A (en) * 1959-12-22 1962-07-31 Hazeltine Research Inc Styli unit
US3161457A (en) * 1962-11-01 1964-12-15 Ncr Co Thermal printing units

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1438829A (en) * 1920-06-24 1922-12-12 Gen Electric Recorder
US2404975A (en) * 1942-05-29 1946-07-30 Rca Corp Recording stylus
US2442561A (en) * 1944-02-02 1948-06-01 William G H Finch Stylus
US2730694A (en) * 1951-02-02 1956-01-10 Ferranti Ltd Amplitude recording system utilizing saturable core reactors
US2743989A (en) * 1952-06-10 1956-05-01 Faximile Inc Facsimile recorder
US2647033A (en) * 1952-06-11 1953-07-28 Gen Electric Spark stylus recording apparatus
US3012839A (en) * 1954-07-15 1961-12-12 Burroughs Corp Electrographic printer
US2869965A (en) * 1954-12-30 1959-01-20 Ibm Electro-sensitive digital data plotter
US2930847A (en) * 1956-11-01 1960-03-29 Rca Corp Printer
US2919171A (en) * 1957-02-27 1959-12-29 Burroughs Corp Page printing apparatus
US3016612A (en) * 1958-04-17 1962-01-16 Ibm Recording device
US2997361A (en) * 1958-06-25 1961-08-22 Ibm Selective electrostatic character printing
US3047872A (en) * 1959-12-22 1962-07-31 Hazeltine Research Inc Styli unit
US3161457A (en) * 1962-11-01 1964-12-15 Ncr Co Thermal printing units

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3405392A (en) * 1965-04-30 1968-10-08 Sperry Rand Corp Electronic calculators
US3971042A (en) * 1970-02-25 1976-07-20 Xerox Corporation Writing apparatus having wear resistant material
US3742846A (en) * 1972-03-31 1973-07-03 Ibm Wire printer with print head moved in figure eight pattern
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
US4136977A (en) * 1976-10-16 1979-01-30 Triumph Werke Nurnberg A.G. Mount for a consumable electrode matrix printer
US4206466A (en) * 1979-03-12 1980-06-03 The United States Of America As Represented By The Secretary Of The Navy Non-fouling print stylus

Also Published As

Publication number Publication date
BE680006A (enrdf_load_stackoverflow) 1966-10-03
NL6605208A (enrdf_load_stackoverflow) 1966-10-31
GB1132302A (en) 1968-10-30

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