EP0326558B1 - Imprimante ou copieur non mecaniques a systeme d'exposition lumineuse dispose dans la region de developpement - Google Patents

Imprimante ou copieur non mecaniques a systeme d'exposition lumineuse dispose dans la region de developpement Download PDF

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Publication number
EP0326558B1
EP0326558B1 EP87905941A EP87905941A EP0326558B1 EP 0326558 B1 EP0326558 B1 EP 0326558B1 EP 87905941 A EP87905941 A EP 87905941A EP 87905941 A EP87905941 A EP 87905941A EP 0326558 B1 EP0326558 B1 EP 0326558B1
Authority
EP
European Patent Office
Prior art keywords
developer
charge image
carrier
image carrier
particles
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
EP87905941A
Other languages
German (de)
English (en)
Other versions
EP0326558A1 (fr
Inventor
Rainer KÖFFERLEIN
Bernhard Schlageter
Erich Baier
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
Siemens Nixdorf Informationssysteme AG
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 Siemens Nixdorf Informationssysteme AG filed Critical Siemens Nixdorf Informationssysteme AG
Publication of EP0326558A1 publication Critical patent/EP0326558A1/fr
Application granted granted Critical
Publication of EP0326558B1 publication Critical patent/EP0326558B1/fr
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
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/169—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer with means for preconditioning the toner image before the transfer
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/095—Removing excess solid developer, e.g. fog preventing

Definitions

  • the invention relates to a non-mechanical printing or copying device according to the preamble of claim 1.
  • charge images are stored on a charge image carrier, e.g. generated in a photoconductor drum and then colored with a colored powder, toner in a developer station.
  • a charge image carrier e.g. generated in a photoconductor drum
  • the toner images are then transferred to plain paper and fixed there.
  • a two-component developer consisting of ferromagnetic carrier particles and colored toner particles is used for development.
  • the developer mixture is e.g. by means of a magnetic brush arrangement on the charge image on the charge image carrier, on which the toner particles - caused by electrostatic forces - stick.
  • the magnetic brush arrangement consists of a rotatable hollow cylinder, in the interior of which several rows of stationary permanent magnets are arranged.
  • a magnetic brush arrangement can be used to transport the developer mixture past the charge image carrier.
  • This magnetic brush arrangement is referred to below as the developer roller.
  • Another magnetic brush arrangement can be used to transport the developer mixture from inside the developer station to the developer roller.
  • Such a magnetic brush arrangement or any other arrangement such Developer mixture transport causes, is called in the following transport roller.
  • DE-PS 31 19 010 discloses developer stations in which developer mixtures are used to color the charge images on the charge image carrier with the aid of the magnetic brush principle.
  • an electrophotographic copier which has a synchronous developer station.
  • the developer station is located downstream a carrier capture roller, which serves to remove excess developer mixture from the charge image carrier.
  • a corona discharge station is arranged between the carrier catching roller and the developer station.
  • coronary discharge stations have the disadvantage that they act both on the colored and on the non-colored areas of the charge image.
  • the object of the invention is to design a non-mechanical printing or copying machine of the type mentioned at the outset in such a way that high printing quality at high process speed using a developer mixture long mixture life is possible.
  • This object is achieved in a non-mechanical printing device of the type mentioned at the outset in that an illumination device for the charge image carrier is arranged between the development area and the device for removing the carrier particles in the developer station, said device illuminating the charge-charged and unloaded areas of the charge image carrier .
  • the lighting device In front of the actual carrier catching device for the carrier particles and the transfer printing station downstream of the carrier catching device, the lighting device generates a largely homogeneous charge image on the charge image carrier.
  • This "imagewise" discharge not only facilitates the removal of the carrier particles from the photoconductor drum by reducing the electrostatic adhesive forces, but also promotes the transfer printing of the toner image onto the paper web in the transfer printing station.
  • a light-emitting diode comb is used as the character generator, a similarly structured device is also recommended for the lighting device.
  • the exposure can also prevent memory effects on the charge image carrier which are disruptive to the print image by charge images which have not been completely deleted.
  • the light source is surrounded by a translucent motor-driven protective roller, which protective roller can consist of a plexiglass tube.
  • the lighting device with its protective tube is arranged inside the developer station, specifically in the vicinity of the last developer roller in the transport direction of the charge image carrier, as a result of which it is continuously cleaned of adhering mixture particles via this developer roller during operation.
  • FIG. 1 shows a schematic sectional view of a developer station in a non-mechanical rapid printing device with the lighting device according to the invention.
  • a photoconductor drum 10 is arranged as a charge image carrier in a printing device, which is not shown in detail here and operates according to the electrophotographic principle.
  • a charge image is applied to this photoconductor drum in a known manner by means of an exposure device which is controlled as a function of the character, and this charge image is then colored using the developer station shown.
  • the coloring takes place according to the reverse development principle, in which the areas discharged by exposure are colored with the aid of a developer mixture 11 containing toner particles and carrier particles. After passing through the developer station, the charge images consisting of colored toner particles are transferred to paper in the usual way.
  • the developer station essentially consists of a storage chamber 12, which is fed through a filling opening 13 with a foam roller arranged therein as a metering device, developer mixture 11.
  • a foam roller arranged therein as a metering device, developer mixture 11.
  • an electromotive driven transport roller in the form of a paddle wheel roller 14 which has spoke-like blades 15 for transporting the developer mixture 11.
  • the storage chamber 12 is closed off from the photoconductor drum 10 by four developer rollers 16, 17, 18 and 19. These developer rollers, which are arranged along the circumference of the photoconductor drum, are located at a close distance of approximately 1 to 2.5 mm from the surface of the photoconductor drum and work according to the magnetic brush principle.
  • the hollow cylinders 20 consist essentially of hollow cylinders continuously driven by means of electromotive devices, for example made of aluminum with a knurled surface and magnet arrangements 21 arranged therein.
  • the hollow cylinders 20 are charged with a bias voltage which is approximately the size of 20-50% of the charging potential of the photoconductor drum .
  • the bias voltage is between 100-500 V.
  • the developer rollers 16, 17 and 18 are designed as so-called synchronous developer rollers.
  • the direction of movement of their hollow cylinders corresponds to the direction of movement of the surface of the photoconductor drum 10 in the region of the development gap 22 formed by the hollow cylinders 20 and the surface of the photoconductor drum 10.
  • the developer roller 19 is designed as a counter-rotating developer roller, in which the hollow cylinder 20 moved in the development gap 22 against the photoconductor drum 10.
  • the developer mixture 11 is transported according to the arrows shown in FIG. 1 in such a way that the developer mixture 11 of the first synchronous developer roller 16 is offered from a mixture sump bottom of the storage chamber 12 via the paddle wheel roller 14.
  • a metering knife 23 determines the height of the developer mixture carpet on the first synchronizing roller 16 and thus also on the following synchronizing rollers 17 and 18.
  • the residual developer mixture transported to the surface of the photoconductor drum 10 now develops the charge image one last time in the opposite direction.
  • the distances between the developer rollers are advantageously less than 2.5 mm, the development gap 22 having a width of 1 to 2.5 mm.
  • the developer mixture must be conveyed with the highest possible density.
  • the density of the developer mixture must be chosen so that on the one hand the latent charge image is well colored and on the other hand the surface of the charge image carrier is not damaged by excessive squeezing.
  • the surface of the developer rollers is, as already described, subjected to a bias voltage of approximately 20-50% of the charge potential.
  • the last developer roller designed as a counter-rotating developer roller 19 there is an illumination device in the form of a light-emitting diode strip or foil 25 which extends along the photoconductor drum 10 and which is accommodated in a protective roller 26 made of a transparent rotating plexiglass tube.
  • Rotation and distance to Counter-rotating developer roller 19 are coordinated so that the surface of the plexiglass tube 26 is continuously cleaned of the developer mixture 11 and the light exit region 27 of the light-emitting diode strip 25 is only slightly dampened by adhering toner dust.
  • the LED strip generates a spectral light that approximately corresponds to the light of the character generator (eg LED comb).
  • a carrier catch roller 28 which operates according to the developer brushes according to the magnetic brush principle and which, in cooperation with the illuminating device, lift the carrier particles of the developer mixture from the areas of the surface of the photoconductor drum which are not imagewise exposed and feeds them again to the developer mixture 11 via a suitably designed guide channel.
  • the lighting device compensates for the charge pattern via the light-emitting diode strip 25 by illuminating the highly charged (approx. 400-1000 V) and non-stressed areas of the surface of the photoconductor drum 10 and thereby discharging to a residual voltage of less than 50 V, thus the discharge voltage of the Character generator corresponds. This reduces the adhesion of negative carrier particles of the developer mixture to the unexposed areas of the surface of the photoconductor drum 10, so that they can be pulled off the surface of the photoconductor drum 10 by the subsequent carrier catch roller 28 and returned to the developer station. At the same time, the lighting device can prevent memory effects due to charge images on the photoconductor drum surface that have not been completely deleted.
  • the lighting device generates a largely homogeneous charge image on the charge image carrier in front of the carrier catching device and the subsequent transfer printing station in the printer.
  • the charge image carrier thus has a uniform residual charging voltage of approximately 50 V.
  • This "imagewise" discharge not only facilitates the removal of the carrier particles from the photoconductor drum, but it also promotes the transfer of the toner image onto the paper web in the transfer station.
  • the light of the exposure device has approximately the same spectral structure as the light of the character generator. If, for example, a light-emitting diode comb is used as a character generator, a similar structured lighting device is recommended. Instead of an LED line, a luminescent film can also be used.
  • the lighting device is surrounded by a suction device, which acts on the area between the carrier catching roller 28 and the protective roller 26 via a suction channel 29 extending along the lighting device.
  • This suction channel 29 is connected via a suction manifold 30 to a suction fan, not shown here.
  • This air suction between the plexiglass tube (protective roller) 26 with the lighting device and the carrier capture roller 28 generates a local vacuum and thus free toner dust that is not bound by the charge image is collected in a container. This means that the free toner dust cannot be torn up out of the developer station by the photoconductor drum 10.
  • Carrier particles caught by the carrier catching roller 28 and developer mixture stripped off by the metering doctor 24 of the counter-rotating developer roller are returned to the storage chamber 12 via guide plates 31.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Cleaning In Electrography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)

Abstract

A l'intérieur de l'unité de développement d'une imprimante rapide de données non mécanique, il est prévu, entre la région de développement et le cylindre collecteur (28) éliminant les particules porteuses, un système d'exposition lumineuse (25) qui éclaire les régions, fortement chargées et non soumises au toner, de la surface du support d'image de charge (10) et ainsi les décharge. L'adhérence des particules porteuses négatives du mélange de développement (11) sur les régions, non exposées à la lumière, de la surface du support d'image de charge (10) s'en trouve alors réduite, le cylindre capteur suivant pouvant ôter de ladite surface lesdites particules.

Claims (5)

1. Dispositif d'impression ou copiage non mécanique comportant une zone de développement (22), dans laquelle une image de charges, produite au moyen d'un dispositif d'exposition sur un support d'images de charges (10), est développée moyennant l'utilisation d'un mélange formant révélateur (11) formé de particules de toner et de particules de support, selon le principe du développement renversé, selon lequel les parties de l'image de charges, déchargées sous l'effet d'une exposition réalisée en fonction d'un symbole, sont encrées par l'intermédiaire de cylindres de développement (16-19), au moyen du mélange formant révélateur (11) et selon lequel un dispositif (28) disposé en aval dans la direction de déplacement du support d'images de charges (10) élimine des particules de support du support d'images de charges (10), caractérisé par le fait qu'en aval de la zone de développement (22) et disposé un dispositif d'exposition (25,26) servant à exposer le support d'images de charges (10) et qui décharge des zones fortement chargées sous l'effet de l'exposition du support d'images de charges et non couvertes de toner, la lumière produite dans le dispositif d'exposition (25,26) correspondant, en ce qui concerne sa composition spectrale, approximativement à la lumière du dispositif d'exposition, et que le dispositif d'exposition (25,26) est disposé à l'intérieur d'un poste de développement situé entre le dispositif servant à éliminer les particules de support (28) du mélange formant révélateur, et la zone de développement (22).
2. Dispositif d'impression ou de copiage non mécanique suivant la revendication 1, caractérisé par le fait que le dispositif d'exposition (25,26) comporte une source de lumière (25), qui est entourée par un cylindre protecteur opaque (26) entraîné par un moteur et qu'il est prévu un dispositif de nettoyage servant à éliminer des particules du mélange qui adhèrent au cylindre de protection (26) au cours du fonctionnement.
3. Dispositif d'impression ou de copiage non mécanique suivant la revendication 1, caractérisé par le fait que le cylindre de protection (26) est formé d'un tube de plexiglas.
4. Dispositif d'impression ou de copiage non mécanique suivant l'une des revendications 2 ou 3, caractérisé par le fait que le cylindre de protection (26) est disposé en étant réglé en rotation et du point de vue de sa distance au cylindre de développement (19) de la zone de développement (22) de manière que le mélange formant révélateur soit éliminé en continu de la surface du cylindre de protection (26).
5. Dispositif d'impression ou de copiage non mécanique suivant l'une des revendications 1 à 4, caractérisé par le fait qu'un dispositif d'aspiration (29,30), qui aspire les particules non fixées du mélange formant révélateur est prévu en tant que dispositif servant à éliminer les particules de support (28).
EP87905941A 1986-09-24 1987-09-21 Imprimante ou copieur non mecaniques a systeme d'exposition lumineuse dispose dans la region de developpement Expired - Lifetime EP0326558B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3632474 1986-09-24
DE19863632474 DE3632474A1 (de) 1986-09-24 1986-09-24 Nichtmechanisches druck- oder kopiergeraet mit einer im entwicklungsbereich angeordneten belichtungseinrichtung

Publications (2)

Publication Number Publication Date
EP0326558A1 EP0326558A1 (fr) 1989-08-09
EP0326558B1 true EP0326558B1 (fr) 1991-10-23

Family

ID=6310263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87905941A Expired - Lifetime EP0326558B1 (fr) 1986-09-24 1987-09-21 Imprimante ou copieur non mecaniques a systeme d'exposition lumineuse dispose dans la region de developpement

Country Status (5)

Country Link
US (1) US5023664A (fr)
EP (1) EP0326558B1 (fr)
JP (1) JP2732846B2 (fr)
DE (2) DE3632474A1 (fr)
WO (1) WO1988002502A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994003842A1 (fr) * 1992-07-30 1994-02-17 Siemens Nixdorf Informationssysteme Aktiengesellschaft Poste de developpement pour une imprimante ou un duplicateur electrophotographique
US20040217472A1 (en) * 2001-02-16 2004-11-04 Integral Technologies, Inc. Low cost chip carrier with integrated antenna, heat sink, or EMI shielding functions manufactured from conductive loaded resin-based materials
JP5293575B2 (ja) * 2009-02-19 2013-09-18 株式会社リコー 画像形成装置及び制御方法
JP6222065B2 (ja) * 2014-12-08 2017-11-01 京セラドキュメントソリューションズ株式会社 画像形成装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3424615A (en) * 1966-01-03 1969-01-28 Xerox Corp Method and apparatus for cleaning xerographic plates
US3543720A (en) * 1968-02-29 1970-12-01 Eastman Kodak Co Apparatus for development of electrostatic images
US3883240A (en) * 1970-03-11 1975-05-13 Canon Kk Electrophotographic copying machine
US3912388A (en) * 1970-12-29 1975-10-14 Canon Kk Developing device for use in electrophotographic copying machines
NL7508994A (nl) * 1974-09-25 1975-10-31 Xerox Corp Inrichting voor het verwijderen van achtergrond- deeltjes.
DE3117296C2 (de) * 1981-04-30 1984-01-19 Siemens AG, 1000 Berlin und 8000 München Entwicklerstation zur Entwicklung von auf einem Ladungsbildträger erzeugten Ladungsbilder
DE3119010C2 (de) * 1981-05-13 1986-07-17 Siemens AG, 1000 Berlin und 8000 München Entwicklerstation in einer elektrofotografischen Einrichtung für die Entwicklung von auf einem Ladungsbildträger aufgebrachten Ladungsbildern
FR2521069A2 (fr) * 1982-02-11 1983-08-12 Cii Honeywell Bull Dispositif pour l'application de particules solides sur le support d'enregistrement d'une imprimante non-impact
US4538901A (en) * 1983-01-20 1985-09-03 Ricoh Company, Ltd. Electrophotographic copier with a phantom image suppression function

Also Published As

Publication number Publication date
US5023664A (en) 1991-06-11
DE3632474A1 (de) 1988-03-31
EP0326558A1 (fr) 1989-08-09
WO1988002502A1 (fr) 1988-04-07
JPH02500052A (ja) 1990-01-11
JP2732846B2 (ja) 1998-03-30
DE3774131D1 (de) 1991-11-28

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