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EP0784248B1 - Elektrostatographische Tonerbild-Herstellungsstation - Google Patents

Elektrostatographische Tonerbild-Herstellungsstation Download PDF

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Publication number
EP0784248B1
EP0784248B1 EP19960309137 EP96309137A EP0784248B1 EP 0784248 B1 EP0784248 B1 EP 0784248B1 EP 19960309137 EP19960309137 EP 19960309137 EP 96309137 A EP96309137 A EP 96309137A EP 0784248 B1 EP0784248 B1 EP 0784248B1
Authority
EP
European Patent Office
Prior art keywords
photoconductive surface
toner image
brush
surface means
electrostatographic
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
EP19960309137
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English (en)
French (fr)
Other versions
EP0784248A1 (de
Inventor
Jean Alois Rachel Norbert Van Daele
Bart Jozef Van Dessel
Ludo Verluyten
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.)
Xeikon NV
Original Assignee
Xeikon NV
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 Xeikon NV filed Critical Xeikon NV
Priority to EP19960309137 priority Critical patent/EP0784248B1/de
Publication of EP0784248A1 publication Critical patent/EP0784248A1/de
Application granted granted Critical
Publication of EP0784248B1 publication Critical patent/EP0784248B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
    • G03G21/0035—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using a brush; Details of cleaning brushes, e.g. fibre density

Definitions

  • the present invention relates to an electrostatographic toner image producing station for use with a printer for forming an image onto a substrate, such as paper.
  • Electrostatographic printing operates according to the principles and embodiments of non-impact printing as described, eg, in "Principles of Non-Impact Printing” by Jerome L Johnson (1986) - Palatino Press - Irvine CA, 92715 USA).
  • Electrostatographic printing includes electrographic printing in which an electrostatic charge is deposited image-wise on a dielectric recording member (imaging member) as well as electrophotographic printing in which an overall electrostatically charged photoconductive dielectric recording member is image-wise exposed to conductivity increasing radiation producing thereby a "direct” or “reversal” toner-developable charge pattern on said recording member.
  • Direct development is a positive-positive development, and is particularly useful for reproducing pictures and text.
  • Reversal is of interest in or when from a negative original a positive reproduction has to be made or vice-versa, or when the exposure derives from an image in digital electrical signal form, wherein the electrical signals modulate a laser beam or the light output of light-emitting diodes (LEDs).
  • LEDs light-emitting diodes
  • electrostatic also includes the direct image-wise application of electrostatic charges on an insulating support, for example by ionography.
  • Electrostatographic printers for forming images on a substrate are well known.
  • Such printers may comprise a toner image producing electrostatographic station having rotatable endless photoconductive surface, such as the surface of a drum or belt onto which a toner image can be formed.
  • a number of such image producing stations may be provided.
  • the or each image producing station further comprises means for charging the photoconductive surface. As the surface rotates, it passes an exposure device for forming an electrostatic latent image on the charged surface.
  • a development station deposits toner onto the electrostatic latent image to form a toner image.
  • the toner image is then transferred from the photoconductive surface to the substrate, which for example is paper in sheet or web form.
  • the surface passes a cleaning unit where excess toner is removed from the photoconductive surface.
  • the surface is then ready for a further cycle. If the residual toner is not removed, it may be transferred to the substrate in a subsequent cycle, producing the effect of "ghost" images.
  • cleaning is achieved by scraper blades or aggressive driven circumferentially rotatable cleaning brushes. While such devices can be very effective in cleaning, the lifetime of the photoconductive surface is reduced, especially if delicate or fragile photoconductive surfaces are used, such as organic photoconductors.
  • the cleaning brush is comprised of electrically conductive fibres.
  • European patent specification EP-A-0512362 (Mita Industrial Co. Ltd.) describes a cleaning unit in which two rotatable fur brushes are provided, the tips of the brushes being in contact with a photoreceptor drum, the brushes being electrostatically charged to opposite potentials, to aid in the removal of toner particles of opposite potentials.
  • An AC corona discharger is positioned in advance of the cleaning unit to decrease the charge on the residual toner.
  • the fur brushes are rotated at different speeds.
  • an electrostatographic toner image producing station for use in an electrostatographic printer as defined in the independent claims advantageous embodiments being defined in the dependent claims.
  • the refurbishing brush which characterises the electrostatographic toner image producing station according to the invention has the effect of reducing filming and the build up of extraneous matter on the endless photoconductive surface means.
  • the lateral marks on the printed copies derive from minute scratches in the photoconductive surface, which may be caused by manipulation or touching of the surface during the manufacture thereof and/or during maintenance. It is thought that such scratches may also be caused if there is rubbing of the photoconductive surface by the substrate, for example during maintenance. Initially these scratches have a dimension much less than that of the toner particles (typically about 7 ⁇ m) and do not therefore pick up toner particles and consequently are not noticeable in the printed copies.
  • extraneous matter of sub-micron particle size
  • extraneous matter of sub-micron particle size
  • extraneous matter becomes trapped by these scratches and gradually builds up to such a size that the photoconductive surface becomes locally deformed and thus these scratches result in marks on the printed copies.
  • these sub-micron particles become fused to the photoconductive surface, producing a material which is strongly adhered to the surface and therefore not easily removed by the cleaning brush.
  • longitudinal (e.g. circumferential) scratches in the photoconductive surface may also pick up extraneous matter, this is more easily removed by the cleaning brush and/or at the development station and does not therefore build up to the point where its effect on the printed product becomes noticeable.
  • the rotatable endless surface means comprises a belt or the circumferential surface of a drum, especially a belt or drum which has a photoconductive surface.
  • imaging member comprises a belt or the circumferential surface of a drum, especially a belt or drum which has a photoconductive surface.
  • the refurbishing brush has substantially no degree of movement in the longitudinal direction.
  • the refurbishing brush is stationary.
  • the brush may be mounted on a support fixed to a housing part of the cleaning device or a housing part of the charging means.
  • the brush may be carried on a separate removable housing part.
  • the refurbishing brush support may be urged against the surface of the drum by a light pressure. After a given period of time, say after printing 150,000 copies, the brush can be cleaned by use of a vacuum cleaner, or may be removed and replaced.
  • the refurbishing brush is in the form of a belt which can be driven laterally across the rotatable endless photoconductive surface.
  • the device will usually be provided with a stationary spring loaded support plate for the belt to urge the belt against the drum surface with substantially even pressure.
  • Such a belt may be driven at a relatively slow speed, such as from one tenth to one thousandth of the linear speed of the drum in order to avoid fluidising any particulate material picked up by the brush.
  • a vacuum cleaning device may be applied to the belt at a suitable location.
  • the refurbishing brush is a rotating brush which rotates slower than the drum, for example at a speed of 1 revolution for every 50,000 copies produced by the printer. Such a slowly rotating brush would have a longer lifetime than an equivalent stationary brush.
  • means are provided, located between the transfer means and the driven rotatable cleaning brush, to pre-charge the residual toner.
  • This pre-charging enables the toner to be more easily removed and makes the final charging by the charging means easier.
  • This feature also ensures that substantially all the residual toner is removed by the driven rotatable cleaning brush, leaving the refurbishing brush to remove extraneous matter.
  • the photoconductive surface may be formed of an organic photoconductor.
  • Organic photoconductive (OPC) materials with two recording active layers contain a combination of a charge generating layer (CGL) and charge transporting layer (CTL).
  • CGL charge generating layer
  • CTL charge transporting layer
  • photoconductors of the organic type it is most convenient to charge the surface of the drums to a negative polarity and to develop the latent image formed thereon in reversal development mode by the use of a negatively charged toner.
  • the means for image-wise exposing the charged surface of the drum or belt may comprise an array of image-wise modulated light-emitting diodes or take the form of a scanning laser beam.
  • the toner will usually be in dry particulate form.
  • the refurbishing brush comprises filaments composed of a material selected from polypropylene, polyamides, polyimides, polyesters and mixtures thereof.
  • the refurbishing brush may have a filament packing density of between 10,000 and 100,000 filaments/cm 2 .
  • the charging means is a corona device.
  • the refurbishing brush is preferably located immediately in advance of the charging means. For this reason it is preferred that the filaments of the refurbishing brush be electrically non-conductive, otherwise the electrical field generated by the charging means might be disturbed in an unpredictable manner. It is also important to mount the refurbishing brush in advance of the charging means, so that any charging of the photoconductive surface caused by friction with the refurbishing brush is cancelled out by the charging of the surface with the charging means.
  • the transfer means is a corona device, such as may spray charged particles having a charge opposite to that of the toner particles.
  • the supply current fed to the corona device is preferably within the range of 1 to 10 ⁇ A/cm substrate width, most preferably from 2 to 5 ⁇ A/cm substrate width, depending upon the substrate characteristics and will be positioned at a distance of from 3 mm to 10 mm from the path of the substrate.
  • the developing unit comprises a driven rotatable magnetic developing brush in frictional contact with the drum surface, the magnetic developer brush rotating in a direction opposite to the direction of rotation of the driven rotatable cleaning brush.
  • the position of at least one of said brushes relative to the drum surface may be adjustable thereby to adjust the extent of frictional contact between that brush and the drum surface.
  • the substrate is in the form of a web which constitutes a final support for the toner images and is unwound from a roll, image-fixing means being provided for fixing the transferred images on the web.
  • the printer may further comprise a roll stand for unwinding a roll of web to be printed in the printer, and a web cutter for cutting the printed web into sheets.
  • Drive means are provided to rotate the drum in synchronism with the movement of the substrate.
  • a drive motor may be mounted on a shaft of the drum.
  • the drum is driven by adherent contact with the moving substrate, one or more drive motors being provided for driving the substrate past the image forming station.
  • This arrangement reduces the effect of slippage between the drum surface and the substrate, which can result in image errors, and in the case of multiple station printers, can result in misregistration of images.
  • This indirect driving of the drum is particularly convenient when the substrate is in the form of a web.
  • the drive means for the web may comprise one or more drive rollers, preferably at least one drive roller being positioned downstream of the image producing stations and a brake or at least one drive roller being positioned upstream of the image forming stations.
  • the speed of the web through the printer and the tension therein is dependent upon the speed and the torque applied to these drive rollers.
  • the web is conveyed through the printer at a speed of from 5 cm/sec to 50 cm/sec and the tension in the web at each image producing station preferably lies within the range of 0.2 to 2.0 N/cm web width.
  • the substrate may be in the form of cut sheets, the printer being provided with means known per se for feeding cuts sheets from an input location to an output location by way of a transfer location where toner images from the drum surface are transferred thereto.
  • the substrate prefferably in the form of an intermediate member, from which the images are subsequently transferred to a final support in the form of a web or cut sheets.
  • the printer is an electrostatographic single-pass multiple station printer, which comprises a plurality of electrostatographic toner image producing stations each having a drum onto which a toner image can be formed, and means for conveying substrate in the form of a web in succession past said stations.
  • a printer having a supply station 13 in which a roll 14 of web material 12 is housed, in sufficient quantity to print, say, up to 5,000 images.
  • the web 12 is conveyed into a tower-like printer housing 44 in which a support column 46 is provided, housing four similar printing stations A to D.
  • a further station E is provided in order to optionally print an additional colour, for example a specially customised colour, for example white.
  • the printing stations A to E are mounted in a substantially vertical configuration resulting in a reduced footprint of the printer and additionally making servicing easier.
  • the column 46 may be mounted against vibrations by means of a platform 48 resting on springs 51.
  • the image on the web is fixed by means of the image-fixing station 16 and fed to a cutting station 20 (schematically represented) and a stacker 52 if desired.
  • the printing stations i.e. image producing stations
  • A, B, C, D and E are arranged in a substantially vertical configuration, although it is of course possible to arrange the stations in a horizontal or other configuration.
  • the web of paper 12 unwound from the supply roll 14 is conveyed in an upwards direction past the printing stations in turn.
  • the moving web 12 is in face-to-face contact with the drum surface 26 over a wrapping angle ⁇ of about 15° (see Figure 2) determined by the position of the guide rollers 36.
  • the web of paper 12 passes through the image-fixing station 16, an optional cooling zone (not shown) and thence to the cutting station 20 to cut the web 12 into sheets.
  • the web 12 is conveyed through the printer by two drive rollers 22a, 22b one positioned between the supply station 13 and the first printing station A and the second positioned between the image-fixing station 16 and the cutting station 20.
  • the drive rollers 22a, 22b are driven by controllable motors, 23a, 23b.
  • One of the motors 23a, 23b is speed controlled at such a rotational speed as to convey the web through the printer at the required speed, which may for example be about 125 mm/sec.
  • the other motor is torque controlled in such a way as to generate, in conjunction with brake 11, a web tension of, for example, about 1 N/cm web width.
  • each printing station comprises a cylindrical drum 24 having a photoconductive outer surface 26.
  • a main corotron or scorotron charging device 28 capable of uniformly charging the drum surface 26, for example to a potential of about -600 V
  • an exposure station 30 which may, for example, be in the form of a scanning laser beam or an LED array, which will image-wise and line-wise expose the photoconductive drum surface 26 causing the charge on the latter to be selectively reduced, for example to a potential of about -250 V, leaving an image-wise distribution of electric charge to remain on the drum surface 26.
  • the developer contains (i) toner particles containing a mixture of a resin, a dye or pigment of the appropriate colour and normally a charge-controlling compound giving triboelectric charge to the toner, and (ii) carrier particles charging the toner particles by frictional contact therewith.
  • the carrier particles may be made of a magnetizable material, such as iron or iron oxide.
  • the developer brush 33 contains magnets carried within a rotating sleeve causing the mixture of toner and magnetizable material to rotate therewith, to contact the surface 26 of the drum 24 in a brush-like manner.
  • Negatively charged toner particles triboelectrically charged to a level of, for example 9 ⁇ C/g, are attracted to the photo-exposed areas on the drum surface 26 by the electric field between these areas and the negatively electrically biased developer so that the latent image becomes visible.
  • the toner image adhering to the drum surface 26 is transferred to the moving web 12 by a transfer corona device 34.
  • the moving web 12 is in face-to-face contact with the drum surface 26 over a wrapping angle ⁇ of about 15° determined by the position of guide rollers 36.
  • the charge sprayed by the transfer corona device being on the opposite side of the web to the drum, and having a polarity opposite in sign to that of the charge on the toner particles, attracts the toner particles away from the drum surface 26 and onto the surface of the web 12.
  • the transfer corona device typically has its corona wire positioned about 7 mm from the housing which surrounds it and 7 mm from the paper web.
  • a typical transfer corona current is about 3 ⁇ A/cm web width.
  • the transfer corona device 34 also serves to generate a strong adherent force between the web 12 and the drum surface 26, causing the latter to be rotated in synchronism with the movement of the web 12 and urging the toner particles into firm contact with the surface of the web 12.
  • the web should not tend to wrap around the drum beyond the point dictated by the positioning of a guide roller 36 and there is therefore provided circumferentially beyond the transfer corona device 34 a web discharge corona device 38 driven by alternating current and serving to discharge the web 12 and thereby allow the web to become released from the drum surface 26.
  • the web discharge corona device 38 also serves to eliminate sparking as the web leaves the surface 26 of the drum.
  • the drum surface 26 is pre-charged to a level of, for example -580 V, by a pre-charging corotron or scorotron device 40.
  • the pre-charging makes the final charging by the corona 28 easier.
  • any residual toner which might still cling to the drum surface which may amount to say 10% of the totally applied toner, may be more easily removed by a cleaning unit 42 shown schematically in Figure 2.
  • the cleaning unit 42 includes an adjustably mounted cleaning brush 43, the position of which can be adjusted towards or away from the drum surface 26 to ensure optimum cleaning.
  • the cleaning brush 43 is earthed or subject to such a potential with respect to the drum as to attract the residual toner particles away from the drum surface. After cleaning, the drum surface is ready for another recording cycle.
  • the web After passing the first printing station A, as described above, the web passes successively to printing stations B, C and D, where images in other colours are transferred to the web. It is critical that the images produced in successive stations be in register with each other. In order to achieve this, the start of the imaging process at each station has to be critically timed. However, accurate registering of the images is possible only if there is no slip between the web 12 and the drum surface 26.
  • the electrostatic adherent force between the web and the drum generated by the transfer corona device 34, the wrapping angle ⁇ determined by the relative position of the drum 24 and the guide rollers 36, and the tension in the web generated by the drive rollers 22a, 22b and the braking effect of the brake 11 are such as to ensure that the peripheral speed of the drum 24 is determined substantially only by the movement of the web 12, thereby ensuring that the drum surface moves synchronously with the web.
  • the rotatable cleaning brush 43 which is driven to rotate in a sense the same as to that of the drum 2.4 and at a peripheral speed of, for example twice the peripheral speed of the drum surface.
  • the developing unit 32 includes a developer brush 33 which rotates in a sense opposite to that of the drum 24.
  • the resultant torque applied to the drum 24 by the rotating developing brush 33 and the counter-rotating cleaning brush 43 is adjusted to be close to zero, thereby ensuring that the only torque applied to the drum is derived from the adherent force between the drum 24 and the web 12. Adjustment of this resultant force is possible by virtue of the adjustable mounting of the cleaning brush 43 and/or the developing brush 33 and the brush characteristics.
  • FIG 3 is a similar view to that shown in Figure 2, with certain features illustrated in more detail.
  • the cleaning unit 42 is slidably mounted in the housing of the printer.
  • the cleaning brush 43 rotates in the direction show, in opposition to the direction of movement of the adjacent surface 26 of the drum 24.
  • the cleaning wheel 43 contacts a counter-rotating insulative toner removing roller 62.
  • a scraper blade 64 removes toner particles from the toner removing roller 62 and directs them to be accumulated in the upper portion of the cleaning unit to be removed by an auger 66.
  • a fixed refurbishing brush 68 is mounted on a carrier bar 70 which extends in a direction parallel to the axis of the drum 24.
  • the carrier bar 70 in turn is secured to the cleaning unit 42 in such a manner as to apply the free ends of the brush filaments against the surface 26 of the drum 24 with slight pressure, sufficient merely to overcome any tolerance in the parallel disposition of the carrier bar 70.
  • the fibres of the refurbishing brush 68 are formed of 680/40 denier polypropylene having a packing density of 55,000 filaments/cm 2 .
  • the filament effective lengths are 8.5 mm.
  • the refurbishing brush 68 removes sub-micron particles from the surface 26 of the drum 24 which were not collected by the cleaning brush 43 and thus prevents filming and the build up of extraneous matter in lateral scratches on the surface 26. After about 150,000 A4 sized copies, or equivalent, the cleaning unit 42, together with the attached refurbishing brush 68, is slid out of the printer housing for servicing, during which accumulated extraneous matter on the refurbishing brush 68 is removed with a vacuum cleaner.
  • FIG 4 shows schematically an alternative embodiment of the invention in which the fixed refurbishing brush of Figure 3 is replaced by a refurbishing brush 72 in the form of a belt passing over rollers 74 and 76.
  • the upper run of the belt brush 72 is backed by a spring loaded support plate 79 which urges the brush filaments into contact with the surface 26 of the drum 24.
  • One of the rollers 74, 76 is coupled to a drive device not shown, to drive the belt at a linear speed of, for example, 0.01 to 1.0 cm/sec.
  • a vacuum cleaner device 78 is positioned adjacent one turning end of the belt brush 72, to constantly remove extraneous matter therefrom.
  • the filament materials used for the belt brush 72 may be similar to those used in the embodiment described in relation to Figure 3.
  • printers which are adapted to produce multiple printed copies of an image from an electronic form thereof
  • present invention is also applicable to machines adapted to produce one, or only a few, printed copies of an image which is in optical form, generated from an original thereof.
  • Such machines are often referred to as “copiers”, and the term “printer” used herein should be interpreted to include such machines within its scope.
  • EP-A-629924 Xeikon NV

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)

Claims (9)

  1. Elektrostatografische Tonerbildererzeugungsstation zur Verwendung in einem elektrostatografischen Drucker, wobei die elektrostatografische Tonerbilderzeugungsstation umfasst:
    eine drehbare fotoleitende Endlosoberflächeneinrichtung (26), auf der ein Tonerbild gebildet werden kann;
    eine Aufladeeinrichtung (28) zum Aufladen der fotoleitenden Endlosoberflächeneinrichtung (26);
    eine Belichtungseinrichtung (30, 32) zur Ausbildung eines elektrostatischen Latentbildes auf der aufgeladenen fotoleitenden Endlosoberflächeneinrichtung (26);
    eine Entwicklungsstation (32) zum Abscheiden von Toner auf dem elektrostatischen Latentbild, um ein Tonerbild zu bilden;
    eine Übertragungseinrichtung (34) zum Übertragen des Tonerbildes von der drehbaren fotoleitenden Oberflächeneinrichtung (26) auf ein Substrat (12), und
    eine angetriebene, in Umfangsrichtung drehbare Reinigungsbürste (43) im Reibkontakt mit der fotoleitenden Endlosoberflächeneinrichtung (26), um restlichen Toner von der fotoleitenden Endlosoberflächeneinrichtung zu entfernen;
    gekennzeichnet durch die Bereitstellung einer Voraufladeeinrichtung (40), die zwischen der Übertragungseinrichtung (34) und der angetriebenen drehbaren Reinigungsbürste (43) angeordnet ist, um die fotoleitende Endlosoberflächeneinrichtung voraufzuladen, sowie eine Aufpolierungsbürste (68; 72), die in Fortbewegungsrichtung der fotoleitenden Endlosoberflächeneinrichtung stationär ist und sich hinter der angetriebenen drehbaren Reinigungsbürste und vor der Aufladeeinrichtung im Kontakt mit der fotoleitenden Endlosoberflächeneinrichtung befindet, um eine Filmbildung und eine Akkumulation von Fremdmaterial auf der fotoleitenden Endlosoberflächeneinrichtung zu vermindern.
  2. Elektrostatografische Tonerbilderzeugungsstation nach Anspruch 1, bei der die Aufpolierungsbürste (68) stationär ist.
  3. Elektrostatografische Tonerbilderzeugungsstation nach Anspruch 1, bei der die Aufpolierungsbürste in Form eines Bandes (72) vorliegt, das in seitlicher Richtung über die drehbare fotoleitende Endlosoberfläche (26) hinweg angetrieben werden kann.
  4. Elektrostatografische Tonerbilderzeugungsstation nach einem vorangehenden Anspruch, bei der die fotoleitende Oberfläche (26) von einem organischen Fotoleiter gebildet wird.
  5. Elektrostatografische Tonerbilderzeugungsstation nach einem vorangehenden Anspruch, bei der die Aufpolierungsbürste (68; 72) Fasern umfasst, die aus einem Material bestehen, das aus Polypropylen, Polyamiden, Polyimiden, Polyestern und Mischungen derselben ausgewählt ist.
  6. Elektrostatografische Tonerbilderzeugungsstation nach einem vorangehenden Anspruch, bei der die Aufpolierungsbürste (68; 72) eine Faserpackungsdichte von zwischen 10 000 und 100 000 Fasern/cm2 aufweist.
  7. Elektrostatografische Tonerbilderzeugungsstation nach einem vorangehenden Anspruch, bei der die Aufpolierungsbürste (68; 72) elektrisch nicht-leitende Fasern umfasst.
  8. Elektrostatografische Tonerbilderzeugungsstation nach einem vorangehenden Anspruch, bei der der Toner in trockener teilchenförmiger Form vorliegt.
  9. Elektrostatografische Tonerbilderzeugungsstation zur Verwendung in einem elektrostatografischen Drucker, wobei die elektrostatografische Tonerbilderzeugungsstation umfasst:
    eine drehbare fotoleitende Endlosoberflächeneinrichtung (26), auf der ein Tonerbild gebildet werden kann;
    eine Aufladeeinrichtung (28) zum Aufladen der fotoleitenden Endlosoberflächeneinrichtung (26);
    eine Belichtungseinrichtung (30, 32) zur Ausbildung eines elektrostatischen Latentbildes auf der aufgeladenen fotoleitenden Endlosoberflächeneinrichtung (26);
    eine Entwicklungsstation (32) zum Abscheiden von Toner auf dem elektrostatischen Latentbild, um ein Tonerbild zu bilden;
    eine Übertragungseinrichtung (34) zum Übertragen des Tonerbildes von der drehbaren fotoleitenden Oberflächeneinrichtung (26) auf ein Substrat (12), und
    eine angetriebene, in Umfangsrichtung drehbare Reinigungsbürste (43) im Reibkontakt mit der fotoleitenden Endlosoberflächeneinrichtung (26), um restlichen Toner von der fotoleitenden Endlosoberflächeneinrichtung zu entfernen;
    gekennzeichnet durch die Bereitstellung einer Aufpolierungsbürste (68; 72), die in Fortbewegungsrichtung der fotoleitenden Endlosoberflächeneinrichtung stationär ist und elektrisch nicht-leitende Fasern im Kontakt mit der fotoleitenden Endlosoberflächeneinrichtung hinter der angetriebenen drehbaren Reinigungsbürste und vor der Aufladeeinrichtung umfasst, um eine Filmbildung und eine Akkumulation von Fremdmaterial auf der fotoleitenden Endlosoberflächeneinrichtung zu vermindern.
EP19960309137 1996-01-08 1996-12-13 Elektrostatographische Tonerbild-Herstellungsstation Expired - Lifetime EP0784248B1 (de)

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Application Number Priority Date Filing Date Title
EP19960309137 EP0784248B1 (de) 1996-01-08 1996-12-13 Elektrostatographische Tonerbild-Herstellungsstation

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Application Number Priority Date Filing Date Title
EP96300126 1996-01-08
EP96300126 1996-01-08
EP19960309137 EP0784248B1 (de) 1996-01-08 1996-12-13 Elektrostatographische Tonerbild-Herstellungsstation

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EP0784248A1 EP0784248A1 (de) 1997-07-16
EP0784248B1 true EP0784248B1 (de) 2001-09-12

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JP4857637B2 (ja) 2005-07-27 2012-01-18 ブラザー工業株式会社 感光体用のクリーニング部材とそれを有する感光体カートリッジ及び画像形成装置
JP6210210B2 (ja) * 2013-11-06 2017-10-11 ブラザー工業株式会社 画像形成装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3572923A (en) 1968-08-26 1971-03-30 Xerox Corp Cleaning method and apparatus for electrostatic copying machines
US4134673A (en) * 1975-02-27 1979-01-16 Xerox Corporation Dual brush cleaning apparatus
JPS58196567A (ja) * 1982-05-13 1983-11-16 Canon Inc クリ−ニング装置
JPS61144681A (ja) * 1984-12-18 1986-07-02 Canon Inc クリ−ニング装置
DE68916592T2 (de) 1988-06-23 1994-12-01 Agfa Gevaert Nv Für elektrophotographische Zwecke geeignetes photoempfindliches Aufzeichnungsmaterial.
US5145759A (en) 1989-04-21 1992-09-08 Agfa-Gevaert, N.V. Electrophotographic recording material
JP2793647B2 (ja) * 1989-08-22 1998-09-03 株式会社リコー クリーニング装置
US5233398A (en) 1991-05-02 1993-08-03 Mita Industrial Co., Ltd. Cleaning unit for removing residual toner on photoreceptor drum for use in image forming apparatus
EP0573084B1 (de) 1992-06-04 1997-04-09 Agfa-Gevaert N.V. Phthalocyanine enthaltendes elektrophotographisches Aufreichenungsmaterial
US5455668A (en) 1993-06-18 1995-10-03 Xeikon Nv Electrostatographic single-pass multiple-station printer for forming an image on a web
EP0671672A3 (de) * 1994-03-11 1996-04-24 Xeikon Nv Elektrostatographisches Druckgerät zur Bilderzeugung auf einem Band.

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