EP0193050A1 - Multicolour laser printer - Google Patents
Multicolour laser printer Download PDFInfo
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- EP0193050A1 EP0193050A1 EP86101900A EP86101900A EP0193050A1 EP 0193050 A1 EP0193050 A1 EP 0193050A1 EP 86101900 A EP86101900 A EP 86101900A EP 86101900 A EP86101900 A EP 86101900A EP 0193050 A1 EP0193050 A1 EP 0193050A1
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- European Patent Office
- Prior art keywords
- toner
- station
- color
- printing
- developer
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- 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
- G03G15/0105—Details of unit
- G03G15/0126—Details of unit using a solid developer
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- 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
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0844—Arrangements for purging used developer from the developing unit
Definitions
- the invention relates to a non-mechanical printing or copying device according to the preamble of claim 1.
- Non-mechanical pressure devices such as Representing laser printers are generally known and have been used successfully.
- a latent image is generally produced with the aid of a laser or with the aid of magnetic recording media on a photoconductor drum or a magneto-sensitive drum, which is developed by applying toner in a developer station and then transferred to a tape-shaped recording medium in the subsequent transfer printing station.
- the image, which is loosely located on the recording medium and is made of toner, is is known from DE-OS 27 17 260, fixed.
- the tape-shaped recording medium is then deposited on an automatic paper stacker.
- Multi-color printing is a major problem with laser printers.
- US Pat. No. 3,991,713 it is known from US Pat. No. 3,991,713 to arrange several developer stations with differently colored toner in the case of copying machines on the periphery of the photoconductor drum.
- the transfer of this principle to a laser printer fails due to the high printing speed, which leads to mixing of the individual toners with one another. The frequently required cleaning of the individual developer stations would constantly interrupt printing.
- the object of the invention is to design a non-mechanical printing or copying device of the type mentioned at the outset in such a way that it is suitable for multicolor printing.
- a multicolor print can be produced on the recording medium in this way, that the same record carrier is fed to the device several times with a correspondingly changed ink supply.
- the toner supply to the developer station is stopped, the toner absorption capacity of the charge image carrier is increased by large-area exposure and thus the toner concentration of the toner of the original color in the developer station by transporting the toner from the developer station for the cleaning device via the Charge image carrier reduced.
- the new color is fed to the developer station.
- Non-mechanical printing devices in particular laser printers, which are equipped with a fixing device which works according to the principle of cold fixing, have the advantage that the cold fixing principle means that the laser carrier does not deform the recording medium several times because of the cold fixing principle. Even previously applied toner layers do not change in terms of color and consistency.
- a charge is applied to the surface of a photoconductor drum PH via a charging device LE, on which the charge is then generated by means of a laser beam LS controlled by a computer or with the If a form pre-printing station FVS generates a latent charge image.
- the individual latent charge images are then colored with toner powder in a developer station ES, which is usually equipped with a developer roller EW and toner transport screws SCH.
- the developer station ES contains a two-component developer mixture, which on the one hand consists of the actual toner particles and on the other hand largely consists of carrier particles.
- the mixing ratio of toner particles to carrier particles is generally 1: 100 parts by weight, the toner particles being consumed during the printing process, but the carrier particles remaining within the developer station ES.
- the toner image produced on the photoconductor drum leaves the developer station ES and is transferred in a transfer printing station US to normal paper P which is guided tangentially past the surface of the photoconductor drum by means of a paper transport unit PTE.
- the transfer printing station US has a device which is not described in more detail here and which makes it possible to pivot the paper onto and off the photoconductor drum.
- the paper P is then drawn by pulling rollers ZGR out of the paper transport unit PTE through a fixing station FS, which fixes the toner image with the paper in a fixing steam in a document-correct manner into a paper stacking device PS.
- the cleaning station RS is arranged in the transport direction of the photoconductor drum PH, a fleece cleaning station VL, in which a soft textile fleece grazes the surface of the photoconductor drum and any remaining toner is removed from the surface of the photoconductor drum.
- the developer station ES is connected to a multi-chamber toner storage container M via plastic toner delivery pipes T.
- the multi-chamber toner storage container (FIG. 2) in the example described consists of four individual toner chambers TK1 to TK4 which absorb different colors. Each of these toner chambers TK1 to TK4 has an opening OE at the bottom of the container, in which transport turns are arranged in TS.
- the individual transport coils TS1 to TS4 are arranged within the toner delivery tubes T and have a drive attachment A, which is not shown in detail here. Connected to the drive attachment A is a friction wheel R which can be moved in a fixed setting by means of an actuator ST.
- the friction wheel R in turn is functionally connected to the drive shaft of a drive motor MO via a belt RI.
- the friction wheel R can be displaced in the guide opening of the link K via the actuator ST and thus brought into frictional connection with the different drive approaches A of the different toner transport helices TS.
- the correspondingly colored toner is fed to the developer station ES.
- control of the color change from one toner color to another is carried out by a control arrangement CPU with a microprocessor device, not shown here, which on the one hand has the adjustable drive for the mixing screws, and on the other hand with the individual units of the laser printer (paper transport device, developer station, cleaning station, Fleece station, photoconductor drum, control device for the laser beam).
- a control arrangement CPU with a microprocessor device, not shown here, which on the one hand has the adjustable drive for the mixing screws, and on the other hand with the individual units of the laser printer (paper transport device, developer station, cleaning station, Fleece station, photoconductor drum, control device for the laser beam).
- the recording medium P consisting of normal paper is printed with a first color in a first pass.
- the recording medium is then inserted into the laser printer again and printed again with a second color.
- the change from one color to another is done by first stopping the toner supply to the developer station ES via the control arrangement PCU by stopping the motor MO.
- the transfer printing station US is pivoted away from the photoconductor drum PH.
- the photoconductor drum PH rotates with all the associated units, the fat conductor drum PH is fully exposed via the laser beam LS, and thus its absorption capacity for toner is increased.
- the photoconductor drum PH now transports the residual toner contained in the developer station EW from the developer station EW to the cleaning station RS, where it is removed in a known manner from the photoconductor drum using the cleaning brush RW.
- the toner concentration in the developer station EW is reduced to a minimum within a period of about 5 minutes, ie a proportion of 1.0% toner, based on 99.0% proportions of carrier particles to a toner content of less than 1% o - (Per thousand).
- the developer station is supplied with toner of the desired color for about 2 minutes to the lean developer mixture. This is done by pivoting the friction wheel R via the actuator ST and then actuating the motor drive MO again. After approx.
- mixed colors can now be produced by superimposing several colors or prints of different colors can be produced in succession without the printer operation having to be interrupted for a long time.
- the change from one color to another is done automatically.
- control unit CPU can therefore control the enrichment and emaciation phase via presettable timers. If toner-different consistency is to be used, a device such as that described, for example, in DE-PS 3 1 30 836 can also be used to measure the toner concentration.
- the printing performance is heavily dependent on the number of colors printed.
- Mixed colors can also be expediently generated in the manner described by suitable screening and superimposition of the corresponding primary colors. This is possible both when printing variable data and when the form is the same.
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- General Physics & Mathematics (AREA)
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Abstract
Description
Die Erfindung betrifft ein nichtmechanisches Druck-oder Kopiergerät gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a non-mechanical printing or copying device according to the preamble of claim 1.
Nichtmechanische Druckgeräte wie sie z.B. Laserdrucker darstellen, sind allgemein bekannt und mit Erfolg zur Anwendung gelangt.Non-mechanical pressure devices such as Representing laser printers are generally known and have been used successfully.
Dabei wird im allgemeinen mit Hilfe eines Lasers oder mit Hilfe von magnetischen Aufzeichnungsmitteln auf einer Fotoleitertrommel oder einer magnetosensitiven Trommel ein latentes Bild erzeugt, das durch Auftragen von Toner in einer Entwicklerstation entwickelt und dann in der nachfolgenden Umdruckstation auf einen bandförmigen Aufzeichnungsträger übertragen wird. Das sich lose auf dem Aufzeichnungsträger befindliche, aus Toner bestehende Bild wird mit Hilfe einer Schmelzfixiereinrichtung, wie sie z.B. aus DE-OS 27 17 260 bekannt ist, fixiert. Der bandförmige Aufzeichnungsträger wird dann über einen automatischen Papierstapler abgelegt.A latent image is generally produced with the aid of a laser or with the aid of magnetic recording media on a photoconductor drum or a magneto-sensitive drum, which is developed by applying toner in a developer station and then transferred to a tape-shaped recording medium in the subsequent transfer printing station. The image, which is loosely located on the recording medium and is made of toner, is is known from DE-OS 27 17 260, fixed. The tape-shaped recording medium is then deposited on an automatic paper stacker.
Neben der üblichen Wärmeschmelzfixierung, ist es aus der DE-PS 30 48 477 für Laserdrucker bekannt, Fixierstationen zu verwenden, bei der die Fixierung des Tonergemisches über Fixiermitteldampf erfolgt.In addition to the usual heat-melt fixing, it is known from DE-PS 30 48 477 for laser printers to use fixing stations in which the fixing of the toner mixture takes place via fixing agent vapor.
Ein großes Problem bei Laserdruckem ist der Mehrfarbendruck. So ist es zwar aus der US-PS 3 991 713 bekannt, bei Kopiergeräten am Umfang der Fotoleitertrommel mehrere Entwicklerstationen mit verschiedenfarbigem Toner anzuordnen. Die Übertragung dieses Prinzips auf einen Laserdrucker scheitert aber an der hohen Druckgeschwindigkeit die zu einer Vermischung der einzelnen Toner untereinander führt. Die häufig erforderliche Reinigung der einzelnen Entwicklerstationen würde den Druckbetrieb ständig unterbrechen.Multi-color printing is a major problem with laser printers. Thus, it is known from US Pat. No. 3,991,713 to arrange several developer stations with differently colored toner in the case of copying machines on the periphery of the photoconductor drum. However, the transfer of this principle to a laser printer fails due to the high printing speed, which leads to mixing of the individual toners with one another. The frequently required cleaning of the individual developer stations would constantly interrupt printing.
Die gleichen Vorbehalte gelten für nichtmechanische Druck-oder Kopiergeräte, bei denen anstelle der Fotoleitertrommel eine magnetosensitive Trommel angeordnet ist, auf der das latente Bild durch Magnetisierung erzeugt wird.The same reservations apply to non-mechanical printing or copying devices, in which a magneto-sensitive drum is arranged instead of the photoconductor drum, on which the latent image is generated by magnetization.
Aufgabe der Erfindung ist es, ein nichtmechanisches Druck-oder Kopiergerät der eingangs genannten Art so auszugestalten, daß es für Mehrfarbendruck geeignet ist.The object of the invention is to design a non-mechanical printing or copying device of the type mentioned at the outset in such a way that it is suitable for multicolor printing.
Diese Aufgabe wird bei einer Vorrichtung der eingangs genannten Art gemäß dem kennzeichnenden Teil des ersten Patentanspruches gelöst.This object is achieved in a device of the type mentioned at the outset according to the characterizing part of the first claim.
Weitere vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen gekennzeichnetFurther advantageous embodiments of the invention are characterized in the subclaims
Ordnet man in einen nichtmechanischen Druck-oder Kopiergerät, das nur eine einzige Entwicklerstation aufweist, Tonervorratsbehältem unterschiedlicher Farbe, an die jeweils eine separat betätigbare Tonertransporteinrichtung aufweisen und die mit einer einzigen Entwicklerstation in Verbindung stehen, so läßt sich ein Mehrfarbendruck auf dem Aufzeichnungsträger dadurch erzeugen, daß der selbe Aufzeichnungsträger dem Gerät mehrfach bei entsprechend veränderter Farbzuführung zugeführt wird. Beim erforderlichen Farbwechsel von einer Farbe zu ande-ren, wird dabei die Tonerzuführung zur Entwicklerstation gestoppt, die Toneraufnahmefähigkeit des Ladungsbilderträgers durch großflächige Belichtung erhöht und damit die Tonerkonzentration des Toners der ursprünglichen Farbe in der Entwicklerstation durch Transport des Toners von der Entwicklerstation für Reinigungsvorrichtung über den Ladungsbildträger verringert.If one arranges in a non-mechanical printing or copying device which has only a single developer station, toner storage containers of different colors, each of which has a separately operable toner transport device and which are connected to a single developer station, a multicolor print can be produced on the recording medium in this way, that the same record carrier is fed to the device several times with a correspondingly changed ink supply. When the required color change from one color to another is stopped, the toner supply to the developer station is stopped, the toner absorption capacity of the charge image carrier is increased by large-area exposure and thus the toner concentration of the toner of the original color in the developer station by transporting the toner from the developer station for the cleaning device via the Charge image carrier reduced.
Nach Verringerung der Tonerkonzentration auf einen möglichst geringen Wert, wird die neue Farbe der Entwicklerstation zugeführt.After reducing the toner concentration to the lowest possible value, the new color is fed to the developer station.
Damit ergibt sich ein besonders einfaches und kostengünstiges Verfahren mit Hilfe von nichtmechanischen Druck-oder Kopiergeräten Mehrfarbendruck zu erzeugen, ohne daß dazu mehrere störungsanfällige EntwIcklerstationen entlang von dem Ladungsbildträger angeordnet werden müssen und ohne das die Gefahr besteht, daß eine Vermischung von Toner unterschiedlicher Farbe erfolgt.This results in a particularly simple and inexpensive method of producing multicolor printing with the aid of non-mechanical printing or copying devices, without the need to arrange a plurality of developer stations prone to malfunction along the charge image carrier and without the risk that toner of different colors is mixed.
Die Verwendung eines Mehrkammertoner-Vorratsbehälters mit mehreren einzelnen Farben zugeordnete Tonerkammem, vereinfacht den mechanischen Aufbau und erleichtert den Tonertransport.The use of a multi-chamber toner storage container with toner chambers assigned to several individual colors simplifies the mechanical construction and facilitates the toner transport.
Nichtmechanische Druckeinrichtungen insbesondere Laserprinter, die mit einer Fixiereinrichtung ausgestattet sind, die nach dem Prinzip der Kaltfixierung arbeitet, haben den Vorteil, daß durch das Kaltfixierprinzip ein mehrfacher Durchlauf des Aufzeichnungsträger durch den Laserprinter zu keiner Verformung des Aufzeichnungsträgers führt. Auch früher aufgebrachte Tonerschichten ändern sich hinsichtlich Farbe und Konsistenz nicht.Non-mechanical printing devices, in particular laser printers, which are equipped with a fixing device which works according to the principle of cold fixing, have the advantage that the cold fixing principle means that the laser carrier does not deform the recording medium several times because of the cold fixing principle. Even previously applied toner layers do not change in terms of color and consistency.
Eine Ausführungsform der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden beispielsweise näher beschrieben. Es zeigen
- Fig. 1 eine Funktionsdarstellung eines Laserprinters mit Kaltfixierung mit einem Mehrkammertoner-Vorratsbehälter und
- Fig. 2 eine schematische Darstellung eines Mehrkammertoner-Vorratsbehälters mit einem verstellbaren Antrieb für die Tonertransporteinrichtung.
- Fig. 1 is a functional representation of a laser printer with cold fixation with a multi-chamber toner reservoir and
- Fig. 2 is a schematic representation of a multi-chamber toner reservoir with an adjustable drive for the toner transport device.
Bei dem in der Fig. 1 dargestellten Druck-oder Kopiergerät, das nach dem Prinzip der Elektrofotografie arbeitet, wird über eine Ladeeinrichtung LE eine Ladung auf die Oberfläche einer Fotoleitertrommel PH aufgebracht, auf der dann mittels eines von einem Rechner gesteuerten Laserstrahls LS oder mit dem Licht einer Formularvordruckstation FVS ein latentes Ladungsbild erzeugt wird. Anschließend werden die einzelnen latenten Ladungsbilder in einer Entwicklerstation ES, die in üblicherweise mit einer Entwicklerwalze EW und Tonertransportschnecken SCH ausgestattet ist, mit Tonerpulver eingefärbt. Die Entwicklerstation ES enthält dabei ein Zwei-Komponenten-Entwicklergemisch, das einerseits aus den eigentlichen Tonerteilchen besteht andererseits zum größten Teil aus Trägerteilchen. Das Mischungsverhältnis von Tonerteilchen zu Trägerteilchen beträgt im allgemeinen 1:100 Gewichtsanteile, wobei die Tonerteilchen beim Druckvorgang verbraucht werden, die Trägerteilchen jedoch innerhalb der Entwicklerstation ES verbleiben.In the printing or copying device shown in FIG. 1, which works according to the principle of electrophotography, a charge is applied to the surface of a photoconductor drum PH via a charging device LE, on which the charge is then generated by means of a laser beam LS controlled by a computer or with the If a form pre-printing station FVS generates a latent charge image. The individual latent charge images are then colored with toner powder in a developer station ES, which is usually equipped with a developer roller EW and toner transport screws SCH. The developer station ES contains a two-component developer mixture, which on the one hand consists of the actual toner particles and on the other hand largely consists of carrier particles. The mixing ratio of toner particles to carrier particles is generally 1: 100 parts by weight, the toner particles being consumed during the printing process, but the carrier particles remaining within the developer station ES.
Das auf der Fotoleitertrommel erzeugte Tonerbild verläßt die Entwicklerstation ES und wird in einer Umdruckstation US auf Normalpapier P das tangential an der Fotoleitertrommel-Oberfläche mittels einer Papiertransporteinheit PTE vorbeigeführt wird, übertragen. Die Umdruckstation US weist eine hier nicht näher beschriebene Einrichtung auf, die es ermöglicht das Papier an die Fotoleitertrommel an-und abzuschwenken. Von Zugrollen ZGR wird das Papier P dann aus der Papiertransporteinheit PTE durch eine Fixierstation FS, welche das Tonerbild dokumentenecht mit dem Papier in einem Fixierdampf fixiert, in eine Papierstapeleinrichtung PS gezogen. Nachdem das Tonerbild auf das Papier umgedruckt worden ist, wird von der Fotoleitertrommel-Oberfläche der restliche Toner von einer in einer Reinigungsstation RS vorgesehenen Reinigungsbürste RW abgebürstet und in ein Filtersystem abgesaugt. Zur Feinreinigung ist der Reinigungsstation RS in Transportrichtung der Fotoleitertrommel PH nachgeordnet, eine Vliesreinigungsstation VL, in der über ein weiches Textilvlies das entlang der Fotoleitertrommel-Oberfläche streift, der noch evtl. verbleibende Toner von der Fotoleitertrommel-Oberfläche entfernt wird.The toner image produced on the photoconductor drum leaves the developer station ES and is transferred in a transfer printing station US to normal paper P which is guided tangentially past the surface of the photoconductor drum by means of a paper transport unit PTE. The transfer printing station US has a device which is not described in more detail here and which makes it possible to pivot the paper onto and off the photoconductor drum. The paper P is then drawn by pulling rollers ZGR out of the paper transport unit PTE through a fixing station FS, which fixes the toner image with the paper in a fixing steam in a document-correct manner into a paper stacking device PS. After the toner image has been printed onto the paper, the remaining toner is removed from the surface of the photoconductor drum by a cleaner provided in a cleaning station RS brushing brush RW and brushed into a filter system. For fine cleaning, the cleaning station RS is arranged in the transport direction of the photoconductor drum PH, a fleece cleaning station VL, in which a soft textile fleece grazes the surface of the photoconductor drum and any remaining toner is removed from the surface of the photoconductor drum.
Die Entwicklerstation ES steht über aus Kunststoff bestehende Tonerförderrohre T mit einem Mehrkammertoner-Vor ratsbehälter M in Verbindung. Der Mehrkammertoner-Vorratsbehälter (Fig. 2) besteht in dem beschrieben Beispiel aus vier einzelnen Toner verschiedener Farbe aufnehmenden Tonerkammem TK1 bis TK4. Jeder dieser Tonerkammem TK1 bis TK4 weist am Behältergrund eine Öffnung OE auf, in der Transportwendein TS angeordnet sind. Die einzelnen Transportwendeln TS1 bis TS4 sind innerhalb der Tonerförderrohre T angeordnet und weisen einen hier nicht im einzelnen dargestellten Antriebsansatz A auf. Mit dem Antriebsansatz A in Verbindung steht, ein einer festen Kulisse über ein Stellantrieb ST verschiebliches Reibrad R. Das Reibrad R widerum steht über einen Riemen RI in Funktionsverbindung mit der Antriebswelle eines Antriebsmotores MO. Über den Stellantrieb ST läßt sich das Reibrad R in der Führungsöffnung der Kulisse K verschieben und so in Reibverbindung mit den verschiedenen Antriebsansätzen A der verschiedenen Tonertransportwendeln TS bringen. Abhängig von der gewählten an den einzelnen Tonerkammern TK1 bis TK4 zugeordneten Tonerförderwendeln TS1 bis TS4 wird der Entwicklerstation ES der entsprechend eingefärbte Toner zugeführt. Die Steuerung des Farbwechsels von einer Tonerfarbe zur anderen übemimmt eine Steueranordnung CPU mit einer, hier nicht dargestellten, Mikroprozessor-Einrichtung, die einerseits mit dem verstellbaren Antrieb für die Mischschnecken, anderseits mit den einzelnen Aggregaten des Laserprinters (Papiertransport-Einrichtung, Entwicklerstation, Reinigungsstation, Vliesstation, Fotoleitertrommel, Ansteuereinrichtung für den Laserstrahl) in Verbindung steht.The developer station ES is connected to a multi-chamber toner storage container M via plastic toner delivery pipes T. The multi-chamber toner storage container (FIG. 2) in the example described consists of four individual toner chambers TK1 to TK4 which absorb different colors. Each of these toner chambers TK1 to TK4 has an opening OE at the bottom of the container, in which transport turns are arranged in TS. The individual transport coils TS1 to TS4 are arranged within the toner delivery tubes T and have a drive attachment A, which is not shown in detail here. Connected to the drive attachment A is a friction wheel R which can be moved in a fixed setting by means of an actuator ST. The friction wheel R in turn is functionally connected to the drive shaft of a drive motor MO via a belt RI. The friction wheel R can be displaced in the guide opening of the link K via the actuator ST and thus brought into frictional connection with the different drive approaches A of the different toner transport helices TS. Depending on the selected toner conveying filaments TS1 to TS 4 assigned to the individual toner chambers TK1 to TK4, the correspondingly colored toner is fed to the developer station ES. The control of the color change from one toner color to another is carried out by a control arrangement CPU with a microprocessor device, not shown here, which on the one hand has the adjustable drive for the mixing screws, and on the other hand with the individual units of the laser printer (paper transport device, developer station, cleaning station, Fleece station, photoconductor drum, control device for the laser beam).
Mit der vorstehend beschriebenen Anordnung läßt sich nun in der folgend dargestellten Weise auf einem Aufzeichnungsträger, in diesem Fall einem bandförmigen Aufzeichnungsträger, ein Mehrfarbendruck erzeugen:With the arrangement described above, multi-color printing can now be produced on a recording medium, in this case a tape-shaped recording medium, in the manner shown below:
Zu diesem Zwecke wird der aus Normalpapier bestehende Aufzeichnungsträger P in einem ersten Druchlauf mit einer ersten Farbe bedruckt. Dann wird der Aufzeichnungsträger erneut in den Laserprinter eingelegt und mit einer zweiten Farbe erneut bedruckt. Der Wechsel von einer Farbe zu anderen geschieht dadurch, daß über die Steueranordnung PCU zunächst die Tonerzufuhr zur Entwicklerstation ES durch Anhalten des Motors MO gestoppt wird. Gleichzeitig wird die Umdruckstation US von der Fotoleitertrommel PH abgeschwenkt. Bei sonst voll aktiven Laserprinter, d.h. bei sich drehender Fotoleitertrommel PH mit sämtlichen zugehörigen Aggregaten, wird die Fatoleitertrommel PH über den Laserstrahl LS voll belichtet und damit ihre Aufnahmefähigkeit für Toner erhöht. Die Fotoleitertrommel PH transportiert nun den in der Entwicklerstation EW enthaltenen Resttoner von der Entwicklerstation EW zur Reinigungsstation RS, wo er in bekannter Weise über die Reinigungsbürste RW von der Fotoleitertrommel entfernt wird. Durch dieses Verfahren wird die Tonerkonzentration in der Entwicklerstation EW innerhalb einer Zeitspanne von ca. 5 Minuten auf ein Minimum reduziert, d.h. von einem Anteil von 1,0 % Toner bezogen auf 99,0 % Anteile von Trägerteilchen auf einen Toneranteil von unter 1 %o -(Promille). Im Anschluß daran, wird ca. 2 Minuten lang der Entwicklerstation Toner der gewünschten Farbe dem abgemagerten Entwicklergemisch zugeführt. Dies geschieht durch Verschwenken des Reibrades R über den Stellantrieb ST und der anschließenden erneuten Betätigen des Motorantriebes MO. Nach ca. 2 Minuten wird in der Entwicklerstation EW eine für den Druckbetrieb ausreichende Tonerkonzentration im Entwicklergemisch EW mit der neuen Farbe erreicht. Durch erneute Betätigung der Papiertransporteinheit PTE und Anschwenken der Umdruckstation US kann das inzwischen neu eingelegte Papier P erneut mit der neuen Farbe bedruckt werden.For this purpose, the recording medium P consisting of normal paper is printed with a first color in a first pass. The recording medium is then inserted into the laser printer again and printed again with a second color. The change from one color to another is done by first stopping the toner supply to the developer station ES via the control arrangement PCU by stopping the motor MO. At the same time, the transfer printing station US is pivoted away from the photoconductor drum PH. In otherwise fully active laser printers, ie when the photoconductor drum PH rotates with all the associated units, the fat conductor drum PH is fully exposed via the laser beam LS, and thus its absorption capacity for toner is increased. The photoconductor drum PH now transports the residual toner contained in the developer station EW from the developer station EW to the cleaning station RS, where it is removed in a known manner from the photoconductor drum using the cleaning brush RW. By this method, the toner concentration in the developer station EW is reduced to a minimum within a period of about 5 minutes, ie a proportion of 1.0% toner, based on 99.0% proportions of carrier particles to a toner content of less than 1% o - (Per thousand). Subsequently, the developer station is supplied with toner of the desired color for about 2 minutes to the lean developer mixture. This is done by pivoting the friction wheel R via the actuator ST and then actuating the motor drive MO again. After approx. 2 minutes, a sufficient toner concentration in the EW developer mixture with the new color is reached in the EW developer station. By actuating the paper transport unit PTE again and swiveling the transfer printing station US, the newly inserted paper P can be printed again with the new color.
Mit der vorstehend beschriebenen Vorrichtung lassen sich nun durch Überlagerung von mehreren Farben Mischfarben herstellen bzw. auch Ausdrucke unterschiedlicher Farbe hintereinander bewerkstelligen, ohne daß dazu der Druckerbetrieb eine lange Zeit unterbrochen werden muß. Die Umstellung von einer Farbe zur anderen erfolgt dabei automatisch.With the device described above, mixed colors can now be produced by superimposing several colors or prints of different colors can be produced in succession without the printer operation having to be interrupted for a long time. The change from one color to another is done automatically.
Bei der vorstehend beschriebenen Vorrichtung sind zum Messen der Tonerkonzentration keine besonderen Füllelemente vorgesehen, wobei sich die erforderlichen Zeiten von ca. 5 Minuten zur Abmagerung des Tonergemisches und 2 Minuten zur Anreicherung als gute Erfahrungswerte herausgestellt haben. Die Steuerung der Anreicherung und Abmagerungsphase kann deshalb durch die Steuereinheit CPU über voreinstellbare Zeitglieder erfolgen. Soll tonerunterschiedliche Konsistenz verwendet werden, so kann auch eine Einrichtung wie sie z.B. in der DE-PS 31 30 836 beschrieben ist, zur Messung der Tonerkonzentration verwendet werden.In the device described above, no special filling elements are provided for measuring the toner concentration, the times required of approximately 5 minutes for the thinning of the toner mixture and 2 minutes for the enrichment to be found to be good empirical values. The control unit CPU can therefore control the enrichment and emaciation phase via presettable timers. If toner-different consistency is to be used, a device such as that described, for example, in DE-PS 3 1 30 836 can also be used to measure the toner concentration.
Die Druckleistung ist bei dieser Art des Mehrfarbendruckes von der Anzahl der gedruckten Farben stark abhängig. Wird z.B. ein Stapelpapier (2000 Blatt, 12 Zoll) vierfarbig bedruckt, so reduziert sich die Blattleistung auf 20 bis 25 % gegenüber dem normalen Einfarbendruck. Mischfarben können zweckmäßig auch in der beschriebenen Weise durch geeignete Rasterung sowie Überlagerung der entsprechenden Grundfarben erzeugt werden. Dies ist sowohl beim Druck variabler Daten, als auch beim gleichbleibenden Formularvordruck möglich.With this type of multi-color printing, the printing performance is heavily dependent on the number of colors printed. E.g. A stacked paper (2000 sheets, 12 inches) printed in four colors, so the sheet performance is reduced to 20 to 25% compared to normal single-color printing. Mixed colors can also be expediently generated in the manner described by suitable screening and superimposition of the corresponding primary colors. This is possible both when printing variable data and when the form is the same.
Das vorstehend beschriebene zum Mehrfarbendruckprinzip wurde anhand eines Laserprinters beschrieben, bei dem der Ladungsbildträger über einen Laser beschrieben wird. Anstelle des als Fotoleitertrommel ausgebildeten Ladungsbildträgers läßt sich auch eine magnetosensitive Trommel verwenden, auf der das latente Bild durch Magnetisierung erzeugt wird. Anstelle der großflächigen Belichtung in der Verarmungsphase muß dann eine großflächige Magnetisierung erfolgen.The above-described multi-color printing principle was described using a laser printer, in which the charge image carrier is written using a laser. Instead of the charge image carrier designed as a photoconductor drum, a magnetosensitive drum can also be used, on which the latent image is generated by magnetization. Instead of large-area exposure in the depletion phase, large-area magnetization must then take place.
- LE LadeeinrichtungLE charging device
- PH FotoleitertrommelPH photoconductor drum
- LS. LaserstrahlLS. laser beam
- FVS FormularvordruckstationFVS form pre-printing station
- ES EntwicklerstationES developer station
- EW EntwicklerwalzeEW developer roller
- SCH Tonertransportschnecken (Förderwendeln)SCH toner transport screws (conveying coils)
- US UmdruckstationUS transfer station
- P NormalpapierP plain paper
- PTE PapiertransporteinheitPTE paper transport unit
- ZGR ZugrollenZGR pull rollers
- FS FixierstationFS fuser
- PS PapiertransporteinrichtungPS paper transport device
- RS ReinigungsstationRS cleaning station
- RW ReinigungsbürsteRW cleaning brush
- VL VliesreinigungsstationVL fleece cleaning station
- T TonerförderrohreT toner delivery tubes
- M Mehrkammertoner-VorratsbehälterM Multi-chamber toner container
- TKl...TK4 TonerkammernTKl ... TK4 toner chambers
- OE ÖffnungOE opening
- TS1...TS4 TransportschneckenTS1 ... TS4 transport screws
- A AntriebsansatzA drive approach
- ST StellantriebST actuator
- R ReibradR friction wheel
- RI RiemenRI straps
- K KulisseK backdrop
- CPU SteueranordnungCPU control arrangement
Claims (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3505565A DE3505565C1 (en) | 1985-02-18 | 1985-02-18 | Non-mechanical printing or copying machine for multiple colors |
DE3505565 | 1985-02-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0193050A1 true EP0193050A1 (en) | 1986-09-03 |
EP0193050B1 EP0193050B1 (en) | 1988-05-25 |
Family
ID=6262845
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86101900A Expired EP0193050B1 (en) | 1985-02-18 | 1986-02-14 | Multicolour laser printer |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0193050B1 (en) |
DE (2) | DE3505565C1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0262871A2 (en) * | 1986-09-29 | 1988-04-06 | Xerox Corporation | Xerographic multi colour copying |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63213867A (en) * | 1987-03-03 | 1988-09-06 | Minolta Camera Co Ltd | Method for preventing color mixing |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4082061A (en) * | 1977-03-14 | 1978-04-04 | Xerox Corporation | Multi-color development system |
US4086006A (en) * | 1976-09-30 | 1978-04-25 | Xerox Corporation | Purging system for a development apparatus |
US4142655A (en) * | 1977-05-31 | 1979-03-06 | Xerox Corporation | Toner dispensing and supply arrangement |
US4271784A (en) * | 1978-09-09 | 1981-06-09 | Olympus Optical Co., Ltd. | Apparatus for discharging a fatigued developing agent in a magnetic brush developing device |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3991713A (en) * | 1974-02-20 | 1976-11-16 | Xerox Corporation | Development apparatus for an electrostatographic printing machine |
JPS6024467B2 (en) * | 1976-07-10 | 1985-06-13 | コニカ株式会社 | liquid developing device |
JPS57155551U (en) * | 1981-03-25 | 1982-09-30 |
-
1985
- 1985-02-18 DE DE3505565A patent/DE3505565C1/en not_active Expired
-
1986
- 1986-02-14 EP EP86101900A patent/EP0193050B1/en not_active Expired
- 1986-02-14 DE DE8686101900T patent/DE3660229D1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4086006A (en) * | 1976-09-30 | 1978-04-25 | Xerox Corporation | Purging system for a development apparatus |
US4082061A (en) * | 1977-03-14 | 1978-04-04 | Xerox Corporation | Multi-color development system |
US4142655A (en) * | 1977-05-31 | 1979-03-06 | Xerox Corporation | Toner dispensing and supply arrangement |
US4271784A (en) * | 1978-09-09 | 1981-06-09 | Olympus Optical Co., Ltd. | Apparatus for discharging a fatigued developing agent in a magnetic brush developing device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0262871A2 (en) * | 1986-09-29 | 1988-04-06 | Xerox Corporation | Xerographic multi colour copying |
EP0262871A3 (en) * | 1986-09-29 | 1989-09-27 | Xerox Corporation | Xerographic multi colour copying |
Also Published As
Publication number | Publication date |
---|---|
DE3660229D1 (en) | 1988-06-30 |
EP0193050B1 (en) | 1988-05-25 |
DE3505565C1 (en) | 1986-07-31 |
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