EP0967529A2 - Imprimante multicolore éléctrophotographique modulaire - Google Patents

Imprimante multicolore éléctrophotographique modulaire Download PDF

Info

Publication number
EP0967529A2
EP0967529A2 EP99117795A EP99117795A EP0967529A2 EP 0967529 A2 EP0967529 A2 EP 0967529A2 EP 99117795 A EP99117795 A EP 99117795A EP 99117795 A EP99117795 A EP 99117795A EP 0967529 A2 EP0967529 A2 EP 0967529A2
Authority
EP
European Patent Office
Prior art keywords
photoconductor
printing
color
printing unit
toner
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.)
Granted
Application number
EP99117795A
Other languages
German (de)
English (en)
Other versions
EP0967529B1 (fr
EP0967529A3 (fr
Inventor
Volkhard Maess
Martin Schleusener
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.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems GmbH and Co KG
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 Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP0967529A2 publication Critical patent/EP0967529A2/fr
Publication of EP0967529A3 publication Critical patent/EP0967529A3/fr
Application granted granted Critical
Publication of EP0967529B1 publication Critical patent/EP0967529B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
    • G03G15/0184—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image at least one recording member having plural associated developing units
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1604—Arrangement or disposition of the entire apparatus
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements
    • G03G21/1604—Arrangement or disposition of the entire apparatus
    • G03G21/1619—Frame structures
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
    • G03G15/0194—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to the final recording medium
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00451—Paper
    • G03G2215/00455—Continuous web, i.e. roll
    • G03G2215/00459—Fan fold, e.g. CFF, normally perforated
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
    • G03G2215/017—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member single rotation of recording member to produce multicoloured copy

Definitions

  • the invention relates to an electrophotographic printer for printing a final image carrier with a transport device to transport the final image carrier, with a first one Printing unit for generating a first toner image by a first arrangement of color particles on a first photoconductor, with at least one further printing unit for generating a further toner image by a further arrangement of Color particles on another photoconductor, and with one Transmission device for direct or indirect transmission the first toner image from the first photoconductor and the further toner image from the further photoconductor onto a surface section on the front of the final image carrier.
  • a color separation is understood to be a toner image applied by a single developer station has been.
  • a multicolored toner image is therefore created by the overlay of several color separations.
  • a printer of this type is e.g. from the European patent application EP 0 659 569 A1 is known. With the one described there Printer becomes the first by the first printing unit single color toner image (color separation) fixed before the second also monochrome toner image on the already fixed first Toner image is applied.
  • a perfectly fitting multi-color print is not possible with the known printer because it is not guaranteed can be that the two toner images exactly on the same surface section of the substrate to be printed.
  • the picture elements of the first toner image and the second toner image are not exact aligned with each other. The result is that it is too unwanted overlays or spaces between picture elements different toner images come up (registration error).
  • high quality color printing is not possible.
  • the printer is according to the aforementioned disclosure to adapt to different printing tasks inflexible. Should e.g. can only be printed with one color, this is the second printer according to the aforementioned publication superfluous. You can also use the printer EP 0 659 569 A1 when printing only from a color palette of four preset colors can be selected.
  • the object of the invention is to provide a printer which a multi-color print with a relatively simple structure Quality and the number of colors, the combination of the colors that can be printed at the same time Print used toner colors (color palette), and regarding Register accuracy between certain color separations quickly different printing tasks can be adapted.
  • the printer according to the invention has an assembly for receiving the first printing unit in one first recording and for recording the further printing unit in another shot. Because the recordings in one assembly are arranged, is the spatial distance between the recordings low.
  • the recordings are preferably immediate arranged side by side.
  • the first recording and the further recording have the Invention essentially the same structure.
  • the same Structure of the recordings ensures that printer units can be interchanged, and that depending on required print quality an appropriate number of print units be used in the recordings. An adjustment of further developed or newly developed printing units is possible when designing these printing units on it care is taken that they are used in the recordings can.
  • At least one of the printing units releasably inserted into one of the recordings i.e. this printing unit can easily be included in the respective recording used or removed from this recording.
  • This measure ensures that the Printer according to the invention quickly, i.e. in a few simple steps, can be adapted to different printing tasks can be removed or inserted by removing the releasable printing unit is or is exchanged for another printing unit.
  • an exchange of developer stations in the Printing unit, refilling toner and performing of maintenance work facilitated by a printing unit for the respective activity taken from the assembly and after Completion of the activity is reinstated.
  • the printer according to the invention can use the final image carrier, e.g. sheet material, which is preferably paper, directly or print indirectly.
  • a Intermediate carrier used to transfer the toner images before they are finally transferred to the final image carrier become.
  • Carrier material uses an intermediate carrier, such as the Layering the toner images of different printing units done more accurately. This increases the registration accuracy, because photoconductors and intermediate supports are better too synchronize, as photoconductor and final image carrier.
  • the intermediate carrier consists of a Interaction between photoconductor and intermediate carrier in Selected with regard to abrasion and chemical influence Material. This makes the photoconductor less and more uniform worn out when interacting with a Final image carrier e.g. made of paper.
  • a printer which is suitable for double-sided printing.
  • An embodiment of the invention further relates an electrophotographic printer for multi-color printing the features of claim 7.
  • This printer works according to a process which is referred to below as repeating printing is referred to, in which the final image carrier or Intermediate carrier passed past a printing unit several times the successive at least two toner images on the same Applies surface section of the carrier material.
  • Toner image is at least color particles of three colors ensures that at least picture elements with these colors are exactly aligned with each other.
  • Becomes the first toner image a further toner image generated in a further printing step superimposed, so there are only register errors between toner images of different printing units. The consequence is that the print quality increases.
  • repeat print By the possibility of the repeat print can be the same print quality additional printing units are dispensed with, however a longer printing time and thus a reduced number of per page of printed pages must be accepted.
  • printer according to the invention can however at a later date e.g. another printing unit be inserted into one of the pressure recordings, so that Repeat printing through multi-color printing in one pass can be replaced.
  • Another embodiment of the invention relates a printer with the features of claim 8.
  • This Embodiment of the invention is based on the knowledge that the picture elements when applying a toner image do not deviate from their specified positions (accurate registration). Therefore, in this embodiment the invention when applying one of the toner images at least color particles of two colors applied. So there is already an additive color mixture within one Toner image possible. Are within a toner image the invention applied color particles of three colors, so can e.g. when using the colors red, blue and green one Variety of other colors created by additive color mixing become. In this case, the second printing unit can black toner can be applied. At different Toner images produced in printing units is a registration error unavoidable.
  • a Printing unit with the features of claims 9 and 10, respectively used.
  • a only exposure device in the printing unit of the photoconductor Exposed imagewise only once per toner image. This ensures that the picture elements of the Color separations of the same printing unit as opposed to one Two or more imagewise exposure no positional deviation to each other (accurate registration).
  • positional deviations Registration error
  • Photoconductor and final image carrier or between photoconductor and Intermediate image carrier always available.
  • the printing unit used in the embodiment can Print more than two or more than three colors in one Toner image can be expanded by adding another total exposure unit for lowering the potential surface elements of the surface not yet covered with color particles Photoconductor is used and then by color particles an additional color can be applied. This The process is repeated for each additional color to be applied. With this measure it is possible to start with the first Toner image Color particles at least three or at least four to arrange different colors side by side on the toner image. A variety of subtractive coloring effects can in addition to the additive color effects within a single printing unit with the help of the second or further Printing units can be realized. By expanding the Printing units and by adding additional printing units can the color printing quality up to full color printing to the Printing task, e.g. Line and character printing, Business graphics or high quality full color printing.
  • the photoconductor contains the Invention only an electrode layer carrying a predetermined potential and an approximately parallel photoconductor layer, which results in a simple structure.
  • the colors from a number of possible colors of a color palette selected by the pressure control are one of the development stations Assigned printing units, their toner images to the front or back of the final image carrier directly or indirectly be transmitted.
  • the color palette is one of the development stations Assigned printing units, their toner images to the front or back of the final image carrier directly or indirectly be transmitted.
  • the Developer stations can be used releasably, i.e. the developer stations can easily in the printing units used or removed from the printing units become. Is by the pressure control instead of at least one of the developer stations optionally an additional one Developer station for applying color particles additional color activated, other mixed colors are activated generated. In this way, the printable color space can be transferred to the Printing task to be adjusted. If a larger number, e.g. 10 to 20 specified colors in developer stations outside of the printer are available in a few simple steps the printing units can be used and with the help of Print control can be selected, so is the printer to a variety of printing tasks quickly and easily customizable.
  • the fixing process takes place the toner images only after the toner images were overlaid and possibly on both sides of the Carrier material was applied a multi-color print image. This measure makes it possible to ensure the accuracy of fit Layering the toner images increases because of the backing material not due to the fixation of solid paint particles occurring heat is affected. Also eliminated additional fuser stations, so that the printer is easy to set up is and consumes considerably less energy.
  • the invention can be used with a dry toner that is only solid Contains color particles, or executed with a liquid toner in which e.g. the color particles in a carrier liquid are included.
  • FIG. 1 shows a schematic diagram of an electrophotographic Printer 10 for multi-color printing with essential electrical and mechanical functional units.
  • the printer 10 has one driven by a motor 12 via a shaft 14
  • Transport device 16 for transporting a carrier material 18 past a printing unit receptacle 20 essentially according to a predetermined printing speed VD.
  • the endless support material 18 can be changed
  • printing unit receptacle 20 depending on the printing requirements regarding the quality of the printed image and the number of colors to be printed in printing unit inserts I to III printing units added in the by an arrow 22 clarified transport direction arranged one behind the other become.
  • the construction of a printing unit is shown below explained with reference to Figure 4.
  • the printing units can be on simple way, e.g. in a few simple steps, into the printing unit slots I to III used or from these be removed.
  • a printing unit in the printing unit insert I generates an first toner image, which is made using a transfer printing corona device (cf. part a of FIG. 2) onto the carrier material 18 is transmitted.
  • Print units in the print units II or III possibly generate a second or third toner image, which is also using the printing units assigned transfer printing corona devices (see Part b and part c of FIG. 2) transferred to the carrier material 18 becomes.
  • the second toner image is immediately above the first Toner image applied and the third toner image becomes immediate applied over the second toner image so that the Overlay toner images to the printed image.
  • the carrier material 18 on the printing unit holder 20 After the carrier material 18 on the printing unit holder 20 has been transported past, it becomes a fixing station 24 supplied, in which the still smearable toner images with the Backing material 18 with the help of pressure and temperature smudge-proof to be merged.
  • Seen in the transport direction 22 in front of the printing unit receptacle 20 is a first deflection unit 26 arranged, the carrier material 18 of the printing unit receptacle 20 passes.
  • Another deflection unit 28 stacks the printed carrier material 18 on a stack 30.
  • the substrate 18 is at the beginning of the printing process removed from a stack 32 by the first deflection unit 26. Instead of the two stacks 30 and 32 there are also rolls used, on which the carrier material 18 is rolled up.
  • the printing process is controlled by a print controller 34, the at least one microprocessor 36 and a memory 38 contains.
  • the microprocessor 36 works in the memory 38 stored print program and controls the printing process.
  • the pressure controller 34 also prepares Memory 38 stored image data and transfers the processed image data via control and data buses 40, 42 or 44 to the printing units in the printing units I, II and III.
  • the motor 12 is connected via a control line 46 controlled by the pressure controller 34 so that depending on the printing units in the printing unit receptacle 20 the carrier material 18 an optimal transport speed has that with a respective optimal printing speed VD essentially matches.
  • the pressure controller 34 is connected to a via data lines 48 Input / output device 50 connected, among other things, certain Colors can be determined from a color palette for printing.
  • FIG. 2 shows the printing unit receptacle 20 with a printing unit, two printing units or three printing units.
  • Part A FIG. 2 shows the printing unit receptacle 20 with a Printing unit 60 in the printing unit insert I.
  • the mode of operation the printing unit 60 is continued with the aid of FIG. 4 explained in detail below.
  • a photoconductor 62 made of a flexible material exists and like a conveyor belt around two pulleys 64 is guided within the printing unit 60.
  • the printing unit 60 is of a chassis 66 made of a stable material surround.
  • the chassis 66 has an opening 68 at which the Photoconductor 62 passed inside the printing unit 60 becomes. Outside of the printing unit 60 is the carrier material 18 guided past the opening 68.
  • Opposite opening 68 a transfer printing corona device 70 is arranged, with a toner image on the photoconductor 62 onto the Carrier material 18 can be transferred.
  • the printing unit 60 can be directed into the pressure receptacle 20 an arrow 72 are inserted until they are not in one the snap-in shown.
  • the printing unit 60 can be done by releasing the catch and moving in the direction an arrow 74 removed from the pressure receptacle 20 to e.g. Refill toner of a certain color Changing colors or repairs in the printing unit 60 perform.
  • the variant of the pressure absorption shown in part a of FIG. 2 20 with a printing unit 60 represents a basic variant, through the one already in the manufacture of the printer 10 later expansion or adaptation to more developed ones Printing units is enabled.
  • Printing unit 60 results in a variety of color combination options. For example, next to black toner particles also toner particles of one or more other colors onto the photoconductor 62 and then onto the carrier material 18 are applied as the first toner image. For one Black and white printing only produces black toner particles applied to the photoconductor 62 by the print controller 34 only one developer station for black toner particles is activated.
  • the printing speed VD is effective regardless of how many developer stations are switched.
  • the developer stations are individually in the printing unit 60 can be used or removed, which means that the Printing unit 60 certain colors depending on printing requirements can be provided in the printing unit 60.
  • the Print controller 34 switches the printing required for printing Developer stations effective. Are in the printing unit Contain 60 more developer stations than at the same time can be activated, so the variability increased again because the pressure control 34 depending on the print specification other developer stations when printing different toner images can switch effectively. Can e.g. a maximum of three Developer stations in the printing unit 60 activated are and are five developer stations in the printing unit 60 available, so when printing a toner image each three developer stations selected by the print controller 34 of the five existing developer stations at the same time be activated.
  • Part b of FIG. 2 also shows the printing unit receptacle 20 two printing units in the printing unit slots I and II.
  • the printing unit 60 is located in the printing unit insert I. and in the printing unit drawer II, which is like the printing unit drawer I is constructed, there is a printing unit 76, which is constructed essentially like the printing unit 60.
  • printing unit 76 can use other toner colors included as the printing unit 60.
  • the printing unit 76 is assigned a transfer printing corona device 78, which a toner image formed on the carrier by the printing unit 76 18 transmits.
  • a subtractive one Perform color mixing.
  • glazing Toners which do not completely absorb incident light, so that it hits an underlying toner layer - Full color printing can be carried out.
  • the print controller 34 must use the standard printer languages such as. Postscript or HP-PCL, given Convert color information so that the printing units 60 and 76 colors are generated that match the desired Colors come close.
  • Part c of FIG. 2 also shows the printing unit receptacle 20 the two printing units 60 and 76 and another in the printing unit insert III inserted printing unit 80, which is also essentially the same as the printing unit 60 is constructed.
  • the printing unit 80 is also a transfer printing corona device 82 assigned.
  • the variant according to part c enables full color printing without special treatment of the Color information of the printer language through the print control 34.
  • the basic colors e.g. Yellow, magenta or cyan are like this distributed to the printing units 60, 76 and 80 that in each Printing unit 60, 76 or 80 each one of the above-mentioned primary colors is included.
  • Figure 3 shows in parts a, b and c, a second printing unit holder 100 with printing unit inserts I ', II' and III 'which, in contrast to printing unit inserts I, II and III printing units 60 '; 60 ', 76' or 60 ', 76', 80 'included.
  • the printing units 60 ', 76' and 80 ' make toner images generated, not on the carrier material 18, but are transferred to an intermediate carrier material 102, so that there is indirect pressure.
  • the intermediate carrier material 102 consists of a flexible material that is like a endless belt around two pulleys 104 is guided.
  • the Print modules 60 ', 76' and 80 ' are essentially like that Print modules 60, 76 and 80 built.
  • Part a of FIG. 3 also shows the printing unit receptacle 100 a printing unit 60 'in the printing unit slot I, the one Toner image generated with a transfer printing corona device 106 is transferred to the intermediate carrier 102.
  • the intermediate carrier material 102 is transported in the direction of arrow 108. If the toner image reaches a transfer printing point 110, then the toner image at transfer location 110 on the carrier material 18 transferred, which also transports past the transfer printing station 110 becomes.
  • Regarding the color combinations to be printed what has been said with reference to part a of FIG. 2 applies.
  • Part b of FIG. 3 also shows the printing unit receptacle 100 two printing units 60 'and 76' in the printing units I 'and II'.
  • the intermediate carrier material 102 is related to selected its carrier properties so that the toner images with high accuracy on the intermediate carrier material 102 can be applied and the positional deviations of the Image elements of different toner images from target positions are very low. By using the intermediate carrier material the quality of multi-color printing increases.
  • the printing unit 76 ' is associated with a corona device 112 which a by the printing unit 76 'produces a toner image on the intermediate carrier transmits and that generated in the printing unit 60 ' Toner image overlaid. Regarding the colors to be printed applies what has been said with regard to part b of FIG. 2.
  • Part c of FIG. 3 also shows the printing unit holder 100 three printing units 60 ', 76' and 80 'in the printing units I ', II' and III '.
  • the printing unit 80 ' is one Transfer printing corona device 114 for transmitting the through the Printing unit 80 'produced toner image on the intermediate material 102 assigned.
  • FIG. 4 shows the essential functional components of the Printing unit 60.
  • the photoconductor 62 consists of a zero potential leading electrode layer 120 and one approximately parallel therefor arranged photoconductor layer 122, which with the Electrode layer 120 over a large area in electrical and mechanical Contact is there.
  • the photoconductor 62 is by the Deflection rollers 64 moved in the direction of an arrow 124.
  • the charging device 126 contains a transverse to the transport direction 124 arranged corona device, each one surface strips of the transverse to the direction of transport 124 Photoconductor 62, which is in the immediate vicinity of the charging device 126 is so charged that an initial potential VA of approximately -1200 V on the surface of the photoconductor layer arises in the area of the area strip (see FIG 5, step S1).
  • the character generator 128 contains one transverse to the direction of transport arranged row of light emitting diodes, each one Area of the photoconductor lying transversely to the transport direction 124 62 illuminate.
  • the character generator 128 is replaced by the Pressure controller 34 controlled so that each image signals Picture elements of a line of the printed image simultaneously in Light signals from the LEDs are implemented.
  • the developer station 130 brings positively charged color particles of the color black K using an auxiliary electrode 160 with a potential VBIAS3 on surface elements that were not exposed. The exact mechanism of action will explained below with reference to FIG. 5 (step S3).
  • Developer station 132 brings negatively charged toner particles the color blue B with the help of an auxiliary electrode 162 a potential VBIAS4 on surface elements that match the third light energy were exposed.
  • the exact mode of action developer station 132 is also below explained with reference to Figure 5 (step S4).
  • the photoconductor 62 is guided past the charging device 134.
  • the loading device arranged transversely to the transport direction 134 becomes the one partially covered with toner particles
  • Photoconductor 62 in the surface elements covered with toner particles charged to a potential VB5 that is slightly larger than the potential on the surface elements, which with the second light energy were exposed see FIG. 5, step S5).
  • the total exposure unit 136 contains a laser diode that crosses into a glass fiber array arranged for the transport direction of the photoconductor 62 Light energy shines in.
  • the glass fiber array is like this trained that essentially over its entire length same light energy is emitted.
  • the light of the total exposure unit 136 can not by already applied black or blue toner particles emit because of the Toner particles is absorbed. Strikes the light of the total exposure unit 136, however, on surface elements of the photoconductor 62, which are not yet covered with toner particles, so the potential on these surface elements is increased (cf. Figure 5, step S6).
  • Developer station 138 brings negatively charged toner particles the color red to the one with the second light energy exposed surface elements of the photoconductor 62.
  • an auxiliary electrode 164 with the potential VBIAS7 is used.
  • the exact mode of action of applying the red Toner particles are also shown in FIG. 5 below explained (step S7).
  • the positively charged black are in the transfer station 140 Reloaded toner particles so that all on the photoconductor 62 applied toner particles are negatively charged (cf. Figure 5, step S8). This measure ensures that transferring the toner image from the photoconductor 62 to the Carrier material 18 with the help of the corona device 70 safely is carried out.
  • the eraser 142 includes a corona device 146 and an exposure unit 148 through which Any remaining charges on the photoconductor are removed.
  • Toner particles left after the toner image is transferred remain on the photoconductor 62 are in the cleaning device 144 with the help of a brush 150 from the photoconductor 62 removed. After being transported past the cleaning facility 144 is the considered strip of the Photoconductor 62 again in a clean initial state and has roughly the same potential at all points.
  • the chassis 66 has on its backing facing away from the carrier material 18 Side a handle 152 with which the printing unit 60 conveniently removed from the printing unit slot I or into the printing unit slot I can be used.
  • Figure 5 shows the potential on the surface of the observed Strip ces photoconductor 62 in an exposure step and two toner polarities.
  • the Time removed in nine consecutive time steps S1 to S9 is divided. That is on the ordinate axis Potential on the surface of the photoconductor 62 with respect to the Potential is shown on the electrode layer 120.
  • step S1 the potential on the surface of the Photoconductor 62 by acting on the field of the charging device 126 lowered to the initial potential VA, which like already mentioned has the value of -1200 V.
  • Step S2 shows the potential profile on the surface of the photoconductor 62 during imagewise exposure using the Character generator 128. Area elements that later with black toner particles should not be covered exposed.
  • the potential VA increases on these surface elements in the course of step S2 only slightly by a Self-discharge of the photoconductor 62 which cannot be suppressed to a value VK2.
  • the potential on the surface elements, that are exposed with the first light energy rises a value VW2 of approximately -800 V.
  • the potential on the surface elements, which exposes with the second light energy were increased to a potential value in the course of step S2 VR2 of around -400 V.
  • the potential on the surface elements, that were exposed with the third light energy increases in step S2 to a potential value VB2 about -100 V.
  • the light energies during exposure are dimensioned so that taking into account the nonlinear photoelectric Properties of the photoconductor 62, the potentials VK2, VW2, VR2 and VB2 are approximately 400 V apart.
  • step S3 the black toner particles are replaced by the Developer station 130 applied.
  • the auxiliary electrode 160 in the immediate vicinity of the photoconductor 62 has the auxiliary potential VBIAS3 of about -900 V.
  • Located on the auxiliary electrode 160 the positively charged black toner particles. Since that Potential VBIAS3 lower than the potentials VW2, VR2 and VB2 is, these potentials are related to the potential VBIAS3 positive.
  • the positively charged black toner particles can however, only be applied to a surface that is related to a of the potential VBIAS3 has lower potential. The only applies to surface elements that are not in step S2 were exposed and at the beginning of step S3 the potential VK2 have. As a result, these are the surface elements black toner particles applied.
  • step S4 the blue toner particles are replaced by the Developer station 132 applied.
  • the auxiliary electrode 162 in the immediate vicinity of the photoconductor 62 has the auxiliary potential VBIAS4 of about -390V.
  • Located on the auxiliary electrode 162 negatively charged blue toner particles. Because the potential VBIAS4 is higher than the potentials VK3, VW3 and VR3 these potentials with respect to the potential VBIAS4 negative. The however, negatively charged blue toner particles can only show up an area can be applied which is a with respect to the potential VBIAS4 has higher potential. This only applies to surface elements to that in step S2 with the third light energy were exposed and at the beginning of step S4 Have potential VB3. As a result, these surface elements applied the blue toner particles.
  • step S5 the potential VB4 on the surface of the surface elements covered with blue toner particles with the help charger 134 is reduced to about -390 V.
  • the potential VK4, VW4 or VR4 in step S5 increases the potential VK5, VW5 or VR5.
  • step S6 by the total exposure unit 136 emitted light, the potentials VW5 and VR5 the surface elements not covered with toner particles in each case increased by about 400 V to the potentials VW6 or VR6.
  • the potential on surface elements, which in step S2 with the second light energy have been exposed, is through the further Exposure in step S6 to the highest potential of all Area elements in step S6.
  • the potentials VK5 and VB5 increase slightly due to the self-discharge of the Photoconductor 62 to the potentials VK6 and VB6.
  • Between Potentials VR6 and VB6 have a difference of approximately 400 V, so that in the following step S7 similar to step S4 toner particles are applied to the surface elements can, which is exposed in step S2 with the second light energy were.
  • step S7 the red toner particles are passed through the developer station 138 applied.
  • the auxiliary electrode 164 in the immediate vicinity of the photoconductor 62 has the auxiliary potential VBIAS7 of about -370 V. Located on the auxiliary electrode 164 the negatively charged red toner particles. Analog to the electrical conditions described in step S4 the negative toner particles are applied to the surface elements, which is exposed in step S2 with the second light energy were.
  • the potentials VK6, VW6 and VB6 increase due to the self-discharge of the photoconductor 62 to the potential values VK7, VW7 or VB7.
  • step S8 the strip of the photoconductor under consideration 62 passed the transfer station 140.
  • the transfer station 140 includes a corona device that a Has a saturation potential value of about -1200 V.
  • a Has a saturation potential value of about -1200 V.
  • step S9 the toner particles are replaced with toner particles covered surface elements essentially while maintaining their position to each other transferred to the carrier material 18.
  • the potential on the surface elements of the increases Photoconductor 62 to about -400 V.
  • the remaining charge on the photoconductor 62 is by the eraser 142 removed so that the photoconductor 62 on its surface a potential value after passing the quenching device 142 of about 0 V.
  • step S3 Light energy radiated onto the respective surface elements.
  • step S8 toner particles of n different additional colors applied to assigned surface elements become.
  • n is an integer, e.g. one two, three etc.
  • Figure 6 shows an embodiment of a printer according to the Invention with two printing unit receptacles 180 and 182, the are each constructed as the printing unit receptacle 20. Due to the arrangement shown in Figure 6, a bilateral Printing of the carrier material 18 take place.
  • Figure 7 shows another embodiment of a printer according to the invention with two printing unit receptacles 190 and 192.
  • Printing unit receptacles 190 and 192 are respectively similar to the printing unit receptacle 20.
  • the difference for Figure 6 is that in Figure 7, toner images from the printing units not to the carrier material 18 directly, but via intermediate carrier materials 200 or 202 are transferred to the carrier material 18.
  • With the in figure 7 variant is therefore a double-sided print possible without the carrier material 18 with the photoconductors the printing units come into contact. A wear of the Photoconductor through the carrier material 18 is thus avoided.
  • Figure 8 shows two possibilities of the so-called "Repeat printing”. Instead of two or three printing units, that work in parallel with one print unit toner images in two or three printing steps generated that successively on the carrier material 18th or printed onto an intermediate carrier material 210.
  • Part a of Figure 8 shows the repeating pressure at which the Toner images directly superimposed on the carrier material 18 become.
  • a printing unit 212 which is in a Printing unit receptacle 214 is located in a first Printing step a first toner image on the in the printing unit 212 existing photoconductor applied.
  • a Corona device 216 is the first toner image on the in Transfer carrier material 18 moved in the direction of an arrow 218.
  • the printing unit 212 is essentially like the printing unit 60 built.
  • Part b of FIG. 8 shows the repetitive pressure on the intermediate carrier material 210 with a printing unit 212 '.
  • a return transport of the carrier material 18 can be omitted and is by Stopping the carrier material 18 replaced.
  • the intermediate carrier material is guided and runs by two deflection rollers 222 in the manner of a conveyor belt.
  • every circulation of the Intermediate substrate 210 may have a toner image on it for the location provided for the printed image can be applied. are all toner images applied, the transfer takes place overlaid toner images using a corona device 224 onto the carrier material 18.
  • the carrier material 18 synchronously for the duration of an intermediate carrier material circulation moved to the intermediate carrier material.
  • the printing unit 212 is located in a printing unit holder 214 and the printing unit 212 'is in one Pressure unit receptacle 214 '.
  • the pressure control 34 from repeating pressure to parallel Pressure switched.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
EP99117795A 1996-10-17 1997-10-16 Procédé d'imprimer aux deux faces d'une bande portant des images finales Expired - Lifetime EP0967529B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19642890 1996-10-17
DE19642890 1996-10-17
EP97913107A EP0932851B1 (fr) 1996-10-17 1997-10-16 Imprimante multicolore electrophotographique modulaire

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP97913107A Division EP0932851B1 (fr) 1996-10-17 1997-10-16 Imprimante multicolore electrophotographique modulaire
EP97913107.5 Division 1998-04-30

Publications (3)

Publication Number Publication Date
EP0967529A2 true EP0967529A2 (fr) 1999-12-29
EP0967529A3 EP0967529A3 (fr) 2000-03-15
EP0967529B1 EP0967529B1 (fr) 2001-08-16

Family

ID=7809038

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97913107A Expired - Lifetime EP0932851B1 (fr) 1996-10-17 1997-10-16 Imprimante multicolore electrophotographique modulaire
EP99117795A Expired - Lifetime EP0967529B1 (fr) 1996-10-17 1997-10-16 Procédé d'imprimer aux deux faces d'une bande portant des images finales

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP97913107A Expired - Lifetime EP0932851B1 (fr) 1996-10-17 1997-10-16 Imprimante multicolore electrophotographique modulaire

Country Status (4)

Country Link
US (2) US6253054B1 (fr)
EP (2) EP0932851B1 (fr)
DE (3) DE59702908D1 (fr)
WO (1) WO1998018056A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4276364B2 (ja) * 2000-08-18 2009-06-10 株式会社リコー ウェブ印刷装置
DE10052371A1 (de) * 2000-10-20 2002-05-02 Schott Glas Modular aufgebaute elektrofotografische Druckvorrichtung
US6671486B1 (en) * 2002-06-06 2003-12-30 Xerox Corporation Common polarity toner duplexing electrostatographic reproduction machine
DE102012103333A1 (de) 2012-04-17 2013-10-17 Océ Printing Systems GmbH & Co. KG Digitaldrucker zum Bedrucken eines Aufzeichnungsträgers

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188110A (en) * 1978-04-03 1980-02-12 Xerox Corporation Photoconductive belt supporting apparatus
US5014094A (en) * 1982-08-17 1991-05-07 Canon Kabushiki Kaisha Process unit and a multi-color image forming apparatus using the same
US5258809A (en) * 1990-02-26 1993-11-02 Siemens Nixdorf Informationssysteme Aktiengesellschaft Electrophotographic printer of modular design
EP0659569A1 (fr) * 1993-12-21 1995-06-28 Nipson S.A. Imprimante à haute cadence d'impression et utilisations d'une telle imprimante
JPH08160839A (ja) * 1994-12-01 1996-06-21 Canon Inc カラー画像形成装置

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3580670A (en) * 1968-08-12 1971-05-25 Xerox Corp Apparatus for duplexing
US4958187A (en) * 1987-02-13 1990-09-18 Canon Kabushiki Kaisha Image forming apparatus for scanning both sides of an original and producing a duplex copy
JPH0424758U (fr) 1990-03-28 1992-02-27
US5138389A (en) * 1990-10-22 1992-08-11 Eastman Kodak Company Imaging apparatus utilizing intermediate transfer member
US5121171A (en) * 1991-01-09 1992-06-09 Xerox Corporation Hybrid color printing machine
DE69209268T2 (de) * 1992-01-20 1996-11-07 Matsushita Electric Ind Co Ltd Elektrophotographisches Farbgerät
EP0635146B1 (fr) * 1992-04-10 1996-08-07 Siemens Nixdorf Informationssysteme Aktiengesellschaft Dispositif d'impression electrophotographique pour l'impression simultanee sur les deux faces d'un support
US5204730A (en) * 1992-06-01 1993-04-20 Xerox Corporation Transfer, detac polarity switching
EP0575947B1 (fr) * 1992-06-24 1997-12-17 Matsushita Electric Industrial Co., Ltd. Appareil électrophotographique couleur
JP3235342B2 (ja) * 1994-05-16 2001-12-04 富士ゼロックス株式会社 多色画像形成装置
US5526107A (en) * 1994-07-13 1996-06-11 Scitex Corporation Ltd. Color printing apparatus for producing duplex copies
US5848323A (en) * 1995-02-06 1998-12-08 Hitachi Koki Co., Ltd. Apparatus for printing images on both sides of an image printing medium by one process
US5765081A (en) * 1995-05-09 1998-06-09 Agfa-Gevaert Electrostatographic multi-color printer for duplex printing on a web-type toner receptor material
US5740510A (en) * 1995-05-09 1998-04-14 Agfa-Gevaert Electrostatographic multicolour printing apparatus for single pass sequential duplex printing on a web-type toner receptor material
US5752137A (en) * 1995-06-09 1998-05-12 Konica Corporation Multi-color image forming apparatus having a plurality of detachable units
JP3749291B2 (ja) * 1995-10-16 2006-02-22 株式会社東芝 画像形成装置
KR970028908A (ko) * 1995-11-24 1997-06-24 엘 드 샴펠라에레 싱글 패스 다색 정전 사진 프린터
JP3251165B2 (ja) * 1995-12-22 2002-01-28 富士通株式会社 カラー印刷装置
US5797077A (en) 1996-04-04 1998-08-18 Fuji Xerox Co., Ltd. Double-sided images forming apparatus and method using the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4188110A (en) * 1978-04-03 1980-02-12 Xerox Corporation Photoconductive belt supporting apparatus
US5014094A (en) * 1982-08-17 1991-05-07 Canon Kabushiki Kaisha Process unit and a multi-color image forming apparatus using the same
US5258809A (en) * 1990-02-26 1993-11-02 Siemens Nixdorf Informationssysteme Aktiengesellschaft Electrophotographic printer of modular design
EP0659569A1 (fr) * 1993-12-21 1995-06-28 Nipson S.A. Imprimante à haute cadence d'impression et utilisations d'une telle imprimante
JPH08160839A (ja) * 1994-12-01 1996-06-21 Canon Inc カラー画像形成装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
KNAPP J F ET AL: "TANDEM TRILEVEL PROCESS COLOR PRINTER" XEROX DISCLOSURE JOURNAL, Bd. 16, Nr. 6, 1. November 1991 (1991-11-01), Seiten 389-390, XP000235472 *
PATENT ABSTRACTS OF JAPAN vol. 096, no. 010, 31. Oktober 1996 (1996-10-31) & JP 08 160839 A (CANON INC), 21. Juni 1996 (1996-06-21) *

Also Published As

Publication number Publication date
US20040179868A1 (en) 2004-09-16
DE59702908D1 (de) 2001-02-15
EP0967529B1 (fr) 2001-08-16
EP0932851B1 (fr) 2001-01-10
DE19781184D2 (de) 1999-10-14
EP0967529A3 (fr) 2000-03-15
US6253054B1 (en) 2001-06-26
EP0932851A1 (fr) 1999-08-04
DE59704338D1 (de) 2001-09-20
WO1998018056A1 (fr) 1998-04-30

Similar Documents

Publication Publication Date Title
DE3329714C2 (fr)
DE69011231T2 (de) Ausdehnung von Drei-Niveau-Xerographie auf schwarz und 2 Farben.
DE68927152T2 (de) Farbbildsimulieren mit nur zwei verschiedenen Farbstoffen oder -tönen
EP1668426B1 (fr) Procede et dispositif de correction du retrait du papier lors de la generation d'une table de bits
DE2408999A1 (de) Farbnorm und verfahren zur eichung eines elektrofotographischen mehrfarbenkopiergeraetes
DE69209268T2 (de) Elektrophotographisches Farbgerät
DE69736209T2 (de) Mehrfarbenbilderzeugungsgerät unter Verwendung eines Zwischenüberträgerbandes
DE3882133T2 (de) Punktdrucker mit tonercharakteristik-kompensationsmittel.
EP0932851B1 (fr) Imprimante multicolore electrophotographique modulaire
DE19536583C2 (de) Vorrichtung zur Ausbildung von Farbbildern
DE3884390T2 (de) Elektrostatografisches gerät mit einem trägergestell, um ein fotoleitfähiges element in genaue stellung zu bringen.
DE2606310A1 (de) Elektrostatografische druckmaschine zur schaffung bildhafter und funktioneller kopien
DE69806110T2 (de) Integriertes System zur Abgabe mehrerer Toner
WO1998018057A1 (fr) Imprimante modulaire electrophotographique couleur
EP0932852B1 (fr) Procede d'impression electrophotographique multicolore avec toner unipolaire
EP0932850B1 (fr) Procede d'impression electrophotographique multicolore avec toner bipolaire
DE3713520A1 (de) Elektrofotografische druckvorrichtung
EP1328849B1 (fr) Systeme d'impression electrophotographique de construction modulaire
DE4408978A1 (de) Verfahren und Einrichtung zur Bilderzeugung
DE19857656B4 (de) Optischer Schreibkopf und Belichtungsgerät mit der Fähigkeit Daten mit hoher Geschwindigkeit ohne Schwankungen in einer Licht-Emittier-Zeitsteuerung zu schreiben
EP0946901B1 (fr) Dispositif d'impression electrographique comportant deux points de duplication
EP1488289B1 (fr) Procede et dispositif d'impression de feuilles individuelles au moyen d'un ensemble inverseur
DE112008000291B4 (de) Verfahren zum Erzeugen von nebeneinander auf einem Bedruckstoff liegenden Druckbildern mit Hilfe einer elektrofotografischen Druckeinrichtung
DE1597851B2 (de) Vorrichtung fuer ein elektrofotografisches mehrfarbenverfahren
WO2005040937A1 (fr) Procede et dispositif pour corriger le retrecissement du papier

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AC Divisional application: reference to earlier application

Ref document number: 932851

Country of ref document: EP

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB

RIC1 Information provided on ipc code assigned before grant

Free format text: 7G 03G 15/01 A, 7G 03G 21/16 B

17P Request for examination filed

Effective date: 20000321

17Q First examination report despatched

Effective date: 20000615

AKX Designation fees paid

Free format text: DE FR GB

RTI1 Title (correction)

Free format text: PROCESS FOR PRINTING ON BOTH SIDES OF A BELT-SHAPED FINAL IMAGE CARRIER

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AC Divisional application: reference to earlier application

Ref document number: 932851

Country of ref document: EP

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 59704338

Country of ref document: DE

Date of ref document: 20010920

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20011117

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20121113

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20121025

Year of fee payment: 16

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20121219

Year of fee payment: 16

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20131016

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 59704338

Country of ref document: DE

Effective date: 20140501

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131016

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20140630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131031

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140501

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20140904 AND 20140910