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US3855600A - Printing device with stabilized printing electrode - Google Patents

Printing device with stabilized printing electrode Download PDF

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Publication number
US3855600A
US3855600A US00317412A US31741272A US3855600A US 3855600 A US3855600 A US 3855600A US 00317412 A US00317412 A US 00317412A US 31741272 A US31741272 A US 31741272A US 3855600 A US3855600 A US 3855600A
Authority
US
United States
Prior art keywords
electrode
printing device
belt
image
image electrode
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
US00317412A
Other languages
English (en)
Inventor
T Potma
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.)
US Philips Corp
Original Assignee
US Philips Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3855600A publication Critical patent/US3855600A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
    • F02B71/045—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby with hydrostatic transmission
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/024—Details of scanning heads ; Means for illuminating the original
    • H04N1/032—Details of scanning heads ; Means for illuminating the original for picture information reproduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H04N1/14—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning using a rotating endless belt carrying the scanning heads or at least a part of the main scanning components

Definitions

  • the image electrode consists of a wire piece which is guided near one end in a slot-like guide AmQC /S9 54 l 7 6 4%B 368 E B 7 4 HUSH n wam ME .E 4 7 u a W 0S M H n E .dwM mmw m v .m a mm .l .w UhF HUM 555 [.ll.
  • the invention relates to a printing device for printing images composed of dot-like or line-like elements, in
  • the image electrode displacement is transverse to the direction of movement of the transport belt, the image elecis .used which comprises a system of five image electrodes.
  • Such a printing head consists of a flat, flexible carrier of an insulating material on which five electrically conductive tracks are provided which constitute the image electrodes.
  • the flexible carrier is bent to form a V-shape along a folding line which is transverse to its longitudinal direction.
  • the V-shaped printing head is arranged to be detachable in a specially shaped opening in the transport belt.
  • This opening has a rim which extends transverse to the longitudinal direction of the transport belt, and which takes along the printing head when the belt is moved.
  • one half of the V is guided under pre-tension against the information carrier, while the other'half of the V is guided under pre-tension in a beam having a U-shaped section.
  • the bottom of said beam isprovided with conductive strips which serve to energize the image electrodes.
  • One end of the electrically conductive tracks of the printing head then slides over the surface of the information carrier, while the other end slides over a conductive strip in the U-shaped beam.
  • a drawback of the described printing device is that both the manufacture and the mounting of the printing head on the transport belt are subject to very narrow tolerances. For example, so as to obtained proper prints,'the ends of the conductors on the printing head which slide over the information carrier must be accurately aligned, while this alignment must be as parallel as possible to the said folding line.
  • the folding line and the rim of the opening in the transport belt must be at right angles to the printing line direction. In the case of an inclined folding line or rim of the opening, it can also occur that the ends of the conductors on the printing head which slide over the conductive strips in the U-beam are not pressed onto these strips under the same pressure, so that irregular wear occurs while the contact area is reduced at thesame time.
  • the invention has for its object to eliminate the said drawbacks.
  • FIG. 1 is a plan view of the relevant parts of a printing device according to the invention.
  • FIG. 2 is a side view of theprinting device according to FIG. 1.
  • FIG. 3 is a diagrammatic representation of the guiding of the image electrode in a printing device according to the invention.
  • FIG. '4 is a bottom view of the guide for the image electrode shown in FIG. 3.
  • FIG. 5 shows a first embodiment of an electrode section of a printing device according to the invention.
  • FIG. 6 shows a second embodiment'of an electrode section of a printing device according to the invention.
  • FIG. 7 shows a third embodiment of an electrode section of a printing device according to the invention.
  • the belt 7 drives a pulley 13 which is also suspended in the frame 9.
  • a transport belt 15 which is further guided via a pulley 19 which is suspended in a U-shaped frame 17.
  • the frames 9 and 17 are connected to a support plate 21 (see FIG. 2).
  • a container 23 with developing powder is arranged at the front of the surface formed by the transport belt 15 and the pulleys Band 19, is a container 23 with developing powder in which a paddle wheel 27 is suspended.
  • the paddle wheel 27 is rotatable by means of a motor 25.
  • Via a shaft 29, the container 23 is journalled in supports 31 which are mounted on the support plate 21.
  • an image electrode 33 Connected to the transport belt 15 is an image electrode 33 which consists of a piece of wire.
  • the method of connection will be described hereinafter with reference to the FIGS. 5, 6 and 7.
  • the image electrode 33 is guided ina slot-like guide 35 which will be described with reference to the FIGS. 3 and 4.
  • a counter electrode 37 Opposite to the image electrode 33, a counter electrode 37 is rigidly arranged.
  • an information carrier 43 (denoted by dotted lines) is guided over the counter electrode 37.
  • the roll 39 is arranged such that the information carrier 43 is guided along a supply aperture 45 of the container 23 after having passed the electrodes 33 and 37.
  • the described printing device is of the static type, which means that brief gas discharges are generated between image electrode 33 and information carrier 43, in order to provide a latent charge image on the information carrier 43 in the pattern of the characters to be printed. Therefore, such an electrical voltage difference is applied between image electrode 33 and counter electrode'37 in known manner at the printing instant, that the so-termed Paschen voltage is exceede'din the space, which is always present between image electrode 33 and information carrier 43.
  • the information carrier 43 consists of a dielectric layer which is provided on a substratum having favorable electrical conductivity properties.
  • the container 23 contains a commonly used developing powder which is applied, by means of the paddle wheel 27, through the supply aperture 45 to the areas of the information carrier 43 where a latent charge image has been formed. The further processing of the information carrier is irrelevant in this context and will not be elaborated upon, and neither will be the device required for this process.
  • the slot-like guide 35 is situated in a beam 47 (FIGS. 3 and 4) which extends parallel to the printing line direction on the information carrier.
  • the beam 47 (not shown in FIG. 2 for the sake of clarity) is connected to the support plate 21.
  • the beam 47 On its left-hand side (FIG.3) the beam 47 is provided with a curved guide path 49 which encloses a wedge-shaped opening 51 in conjunction with pulley 19. At the area where the wedge-shaped opening 51 is narrowest, the guide path 49 changes over into the slot-like guide 35.
  • the guide path 49 serves to stabilize the image electrode 33, which starts to vibrate due to the centrifugal force and vibrations in the transport belt 15. A vibrating image electrode 33 could giverise to irregular printing.
  • Stabilization is effected in that the end of image electrode 33 lands in the guide path 49, and leaves this path only after the undesired vibrations have been substantially damped. This is the case near the transition from guide path 49 to the guide 35.
  • the guide 35 prevents any lateral vibrations of the image electrode'33 from giving rise to irregularities in the height of the characters to be printed.
  • the beam 47 is provided on the one side of the guide 35 with a light source 53, and on the other side of the guide 35 with a photocell (FIG. 4) which is arranged opposite to the light source 53.
  • a photocell FOG. 4
  • the light source-photocell combination is arranged near the end of the guide path 49, so that the light beam is interrupted by an image electrode 33 which is no longer subject to vibrations.
  • another photosensitive member can be used such as, for example, a photodiode.
  • a position indicator for the image electrode 33 which comprises a magnetic circuit with an air gap. When passing through the air gap, the image electrode, made of a magnetically conductive material, changes the magnetic resistance of the magnetic circuit.
  • Interruption of the light beam starts the logic of the printing device by means of the photocell 55. This is effected upon each passage of image electrode 33. By starting the logic in the described manner, the beginning of a line on the information carrier is always printed at the same distance from the edge of the information carrier,
  • the image electrode 33 consists of a U-shaped, scalene, electrically conductive piece of wire (FIG. 5) which is supported in the transport belt 15 of electrically insulating material.
  • One end 57 of the image electrode 33 is guided in slot 35 of the beam 47, which is made of electrically insulating material, for example, wear-resistant synthetic resin such as nylon or epoxy resin.
  • the other end 59 of the image electrode 33 slides over a contact path 61 of electrically conductive material which is provided on the beam 47.
  • the end 57 slides over the information carrier 43 which is in electrical contact with the counter electrode 37.
  • the information carrier 43 is composed of, for example, an electrically conductive layer 63 which is in contact with the counter electrode 37, and a dielectric layer 65 which is in contact with the end 57 of the image electrode 33.
  • the contact path 61 is electrically grounded in a usual manner, whilst the counter electrode 37 is connected to a voltage at-the instant of printing vby means of a switch not showm I V
  • the second embodiment of an electrode section which is shown in FIG. 6, comprises an image electrode 33 which is mounted on the transport belt 15 by means of two fixing blocks 6f7 and 69.
  • the fixing blocks 67 and 69 are made of an electrically conductive material, for example, metal, and are connected to the transport belt 15 by means of an electricallyconductive glue.
  • the transport belt 15 is made of an electrically conductive material in this case;
  • the block 67 has a borehole 71 in which one end 73 of the image electrode 33 is inserted.
  • a part 75 of the image electrode 33 is situated in a slot 77, and a part 79 in a slot 81.
  • a part 83 of the image electrode 33 bears under pre-tension against the wall of a bore-hole 85 provided in the block 69.
  • the part 83 is arranged in the bore-hole 85 via a slot 87 in the block 69.
  • An advantage of the electrode section according to FIG. 6, is that a worn image electrode can be quickly replaced by a new one.
  • the image electrode 33 is electrically connected to ground. This is possible, for example, by means of a commonly used slide contact against the pulley 19, (see FIG. 3) which is made of metal for this purpose.
  • the counter electrode 37 (see FIG. 2) is then controlled by voltage pulses.
  • the image electrode 33 is connected, via two electrically conductive blocks 89 and 91 on the transport belt 15, which is made of electrically conductive material, by means of an electrically conductive glue.
  • the block 89 has a U-shaped slot 93, which is bridged by a bolt 95 which is screwed into the block 89 and about which a part 97 of the image electrode 33 is wound.
  • the block 91 is provided with a bore-hole 99, the wall of which is engaged under pretension by both a part 101 and a part 103 of the image electrode 33.
  • Theparts 101 and 103 can be arranged in the bore-hole 99 via a slot 105.
  • the-transport belt 15 (FIG. 3) can be provided with a number of image electrodes 33.
  • the counter electrode 37 (FIG. 2) is then subdivided into a number of separately controllable electrodes.
  • the beam 47 (FIGS. 3 and 4) which forms a guide for the image electrode 33 can be made as a single piece, or can be composed of parts.
  • the curved guide path 49 can consist of a separate part which is connected on the beam 47. In that case, it is possible to use different materials for the beam 47 and the guide path 49.
  • the transport belt 15 can be completely, but also partly, made of metal, for example, a steel band.
  • a transport belt 15 which consists of a textile-reinforced synthetic resin material on which a conductive lacquer is provided, a
  • the transport belt 15 is connected to ground by means of a slide contact directly on the transport belt.
  • the image electrode 33 can also be stabilized by making the electrode slide along a wall of the guide 35 under pretension.
  • the guide path 49 can then be dispensed with.
  • a printing device not only the commonly used dielectric paper can be used, but also information carriers which consist of, for example, a non-transparent semiconductor layer on a base of material which contrasts therewith, a carrier which is impregnated in electrolyte in which pigment is formed, or a currentsensitive information carrier.
  • an image electrode comprising a wire-like conductive member extending generally radially from and supported by said belt, said image electrode movable with said belt;
  • curved guide path means guiding said image electrode and having a curved guide path feeding the slot-like aperture of said electrode guide means for stabilizing the movement of said image electrode;
  • said information carrier passing between said belt and said counter electrode, and consequently between said image electrode and said counter electrode, when said image electrode is" transported by belt in juxtaposition to said counter electrode, said information comprising:
  • the image electrode comprises a U-shaped piece of wire supported by said belt, one leg of the U-shaped piece of wire being guided in said slot-like electrode guide means during printing, the other leg of the U- shaped wire being in electrical contact with a conductive portion of said electrode guide means.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electronic Switches (AREA)
US00317412A 1972-01-28 1972-12-21 Printing device with stabilized printing electrode Expired - Lifetime US3855600A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7201224A NL7201224A (it) 1972-01-28 1972-01-28

Publications (1)

Publication Number Publication Date
US3855600A true US3855600A (en) 1974-12-17

Family

ID=19815248

Family Applications (1)

Application Number Title Priority Date Filing Date
US00317412A Expired - Lifetime US3855600A (en) 1972-01-28 1972-12-21 Printing device with stabilized printing electrode

Country Status (9)

Country Link
US (1) US3855600A (it)
JP (1) JPS4886436A (it)
CA (1) CA978584A (it)
DE (1) DE2301154A1 (it)
FR (1) FR2169643A5 (it)
GB (1) GB1371471A (it)
IT (1) IT974162B (it)
NL (1) NL7201224A (it)
SE (1) SE389473B (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100551A (en) * 1975-09-09 1978-07-11 Sci Systems, Inc. Rotary electrical printer and method
US4460908A (en) * 1981-02-26 1984-07-17 Sinclair Research Limited Printing apparatus
US5283594A (en) * 1990-12-18 1994-02-01 Brother Kogyo Kabushiki Kaisha Color image recording apparatus for recording a color image on a recording medium with color particles with a vibrating print head

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212970A (en) * 1938-11-16 1940-08-27 William G H Finch Multistylus facsimile recorder
US2770517A (en) * 1954-03-18 1956-11-13 Western Union Telegraph Co Facsimile scanning mechanism
US3108845A (en) * 1961-06-19 1963-10-29 Western Union Telegraph Co Adjustable stylus holder for facsimile recording
US3392404A (en) * 1967-04-06 1968-07-09 Ross Lab Inc Electric discharge recording stylus
US3674923A (en) * 1969-06-30 1972-07-04 T H Gift Co Inc Facsimile system with improved scanning
US3707601A (en) * 1970-07-24 1972-12-26 Phonocopy Inc Facsimile transceiver

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212970A (en) * 1938-11-16 1940-08-27 William G H Finch Multistylus facsimile recorder
US2770517A (en) * 1954-03-18 1956-11-13 Western Union Telegraph Co Facsimile scanning mechanism
US3108845A (en) * 1961-06-19 1963-10-29 Western Union Telegraph Co Adjustable stylus holder for facsimile recording
US3392404A (en) * 1967-04-06 1968-07-09 Ross Lab Inc Electric discharge recording stylus
US3674923A (en) * 1969-06-30 1972-07-04 T H Gift Co Inc Facsimile system with improved scanning
US3707601A (en) * 1970-07-24 1972-12-26 Phonocopy Inc Facsimile transceiver

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4100551A (en) * 1975-09-09 1978-07-11 Sci Systems, Inc. Rotary electrical printer and method
US4460908A (en) * 1981-02-26 1984-07-17 Sinclair Research Limited Printing apparatus
US5283594A (en) * 1990-12-18 1994-02-01 Brother Kogyo Kabushiki Kaisha Color image recording apparatus for recording a color image on a recording medium with color particles with a vibrating print head

Also Published As

Publication number Publication date
GB1371471A (en) 1974-10-23
IT974162B (it) 1974-06-20
CA978584A (en) 1975-11-25
SE389473B (sv) 1976-11-08
JPS4886436A (it) 1973-11-15
NL7201224A (it) 1973-07-31
DE2301154A1 (de) 1973-08-02
FR2169643A5 (it) 1973-09-07

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