EP0233469A1 - Mixing device for cross-mixing developer mix in development units of electrophotographic printing systems - Google Patents

Mixing device for cross-mixing developer mix in development units of electrophotographic printing systems Download PDF

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Publication number
EP0233469A1
EP0233469A1 EP87100411A EP87100411A EP0233469A1 EP 0233469 A1 EP0233469 A1 EP 0233469A1 EP 87100411 A EP87100411 A EP 87100411A EP 87100411 A EP87100411 A EP 87100411A EP 0233469 A1 EP0233469 A1 EP 0233469A1
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EP
European Patent Office
Prior art keywords
mixing
developer
scraping
trough
screw
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87100411A
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German (de)
French (fr)
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EP0233469B1 (en
Inventor
Joseph Dipl.-Ing.(Fh) Knott
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Siemens AG
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Siemens AG
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/80—Falling particle mixers, e.g. with repeated agitation along a vertical axis
    • B01F25/83—Falling particle mixers, e.g. with repeated agitation along a vertical axis with receptacles provided with fixed guiding elements therein, e.g. baffles; Cross-mixers comprising crossing channels for guiding the falling particles
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/08—Details of powder developing device not concerning the development directly
    • G03G2215/0802—Arrangements for agitating or circulating developer material
    • G03G2215/0816—Agitator type
    • G03G2215/0819—Agitator type two or more agitators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S222/00—Dispensing
    • Y10S222/01—Xerography

Definitions

  • the invention relates to a mixing device for mixing a developer consisting of carrier particles and toner according to the preamble of patent claim 1.
  • German patent 31 17 309 describes a mixing device for mixing a developer consisting of carrier particles and toner, which is used in the developer station of a printer which works according to the electrophotographic principle.
  • the replenished toner is mixed into the developer in the mixing tank over the entire length and fed to the development process on one side at the end of the mixing tank. Since the developer mixture enriched with supplied toner has a higher toner concentration than the rest of the developer, the unilateral addition of the developer enriched with toner leads to an uneven distribution of the toner concentration in the development area. As a result, unacceptably high coloration differences across the width of the writing may occur. This negative effect is particularly pronounced in the case of weak coloring, high print image utilization and when printing barcodes.
  • the object of the invention is to design a mixing device of the type mentioned so that the Ent a uniformly mixed developer mixture is offered across the entire width to the developer roller transporting the charge image carrier.
  • the arrangement of mixing strips which overlap several slopes of the first mixing screw and which are arranged in the entrance area adjacent to one another and axially offset in the mixing trough results in rapid mixing of the developer supplied. Through a multitude of openings in the mixing trough, the developer is evenly fed to the mixing chamber when the developer is transported away from the entrance area.
  • the mixing trough has a trough height that decreases in the conveying direction of the developer, so that the developer passes over the edge of the mixing trough into the mixing chamber from a predetermined filling level.
  • An additional mixture level control is achieved with different levels.
  • a constant mixture level both in the mixing tub and in the mixing chamber is necessary for a uniform coloring across the printing width.
  • the formation of the scraping bar on the developer roller in the form of a scraping comb which is formed with scraping teeth and which extends almost over the entire width of the developer roller enables the developer adhering to the developer roller to be removed evenly and fed to the mixing pan for renewed mixing.
  • a metering baffle extending over the area of the scraper teeth is arranged at an angle to the scraper bar, which feeds the developer stripped from the scraper teeth on the one hand through the interdental spaces of the mixing chamber and on the other hand via recesses in the scraper bar of the mixing trough.
  • the metered transfer of the enriched developer into the mixing chamber or the storage area formed at the bottom of the mixing chamber is brought about by defined inclined slots in the mixing trough.
  • the defined width of the slits prevents toner clumps that have not yet been mixed into the supply area from passing over.
  • baffles are arranged, which have the task of giving the non-scraped off portion of the developer located on the developer roller in the storage area of the mixing chamber a certain flow direction. In cooperation with the second mixing screw in the storage area of the mixing chamber, a uniform developer distribution and a rapid migration of the developer is achieved.
  • the mixture flow which is controlled via the metering baffle and the baffles formed thereon, enables this Keep slanted slots in the mixing trough on the side of the storage area of the mixing chamber free from developers. The developer thus falls into the storage area of the mixing chamber without interference.
  • the device described In addition to improving the cross-mixing, the device described also achieves automatic mixture emptying through the fixed scraper bar. This eliminates the usual pivoting or the arrangement of an emptying plate.
  • a developer station operating according to the principle of cross-mixing is arranged.
  • the developer station 10 is located adjacent to a charge image carrier (not shown here) which consists of a photoconductor drum and which is dyed in a known manner via a first winding roller 11 (magnetic brush principle).
  • the developer station 10 contains an actual mixing chamber 12 with a storage area 13 and a mixing trough 14 arranged in it at the bottom of the developer station has axially offset mixing strips 17, each spanning a plurality of turns 18 of the first mixing screw.
  • the mixing pan 14 also has along it Most mixing screw arranged inclined slots 19.
  • the mixing trough 14 has a trough height 21 which decreases in the conveying direction of a developer mixture 20, the function of which will be described later.
  • a second mixing screw 22 in the storage area 13 of the developer station, which is also provided with turns.
  • the second mixing screw 22 is covered with a protective plate 23 opposite the developer roller (magnetic roller).
  • a baffle 27 is arranged as a guide device on the scraping area 25 of the scraping bar 24 arranged in the vicinity of the feed area 16.
  • a metering guide plate 28 which extends over the area of the scraping teeth 26 and which passes through the scraping teeth 26 of the scraping bar 24 and thereby leaves through openings 29 open above the teeth 26.
  • the metering baffle 28 has baffles 30 on its lower part.
  • the metering baffle 28 is formed in one piece together with the baffles 30, the baffles being in the form of set blades.
  • the scraper bar 24 is used to deliver the toner mixture to the toner supply area 16 of the mixing trough 14 via the scraper area 25 and the guide plate 27.
  • the replenished toner is rapidly mixed in by means of the mixing bars 17, which are offset by 180 ° and displaced in the axial direction of the first mixing screw 15 the mixing tub 14 significantly reduced and also prevents a so-called floating of the toner.
  • Sufficient mixing of toner, both fresh toner and toner from the developer station can thus take place within a short mixing distance. Due to the short mixing path, it is possible to offer the developer enriched with supplied toner almost uniformly over the entire developer station range to the development process.
  • inclined slots 19 with the dimensions of 25 ⁇ 1.1 mm have an inclination angle of 45 ° and with a pitch of 10 mm.
  • a certain geometry and position of the mixing trough 14 and the oblique slots 19 is important for functional reasons.
  • the defined width of the oblique slits 19 thus prevents toner clumps which have not yet been mixed in from entering the storage area 13.
  • the scraping bar 24 is moved through the scraping teeth 26 in connection with the through openings of the metering baffle 28, approximately the amount of developer of the mixing trough 14 is added, which passes through the oblique slots 19 of the mixing trough 14 into the storage area 13.
  • the two mixing screws move in the opposite direction of rotation (arrow direction) during the mixing process.
  • the flow directions of the developer mixture that occur as a result of the mixing process are shown in the drawings as arrows labeled EF (developer flow).

Abstract

In einer nach der im Prinzip der Querdurchmischung arbeitenden Entwicklerstation in einer elektrofotographischen Druckeinrichtung sind zwei gegenläufige Mischschnecken (15, 22) voneinander angeordnet. Die erste Mischschnecke (15) befindet sich in einer Vielzahl von Schrägschlitzen versehenen Mischwanne (14) und weist im Zuführungsbereich des Entwicklergemisches zwei um 180° benachbarte zueinander versetzte Mischleisten (17) auf. Oberhalb der beiden Mischschnecken (15, 22) befindet sich eine Abschabeleiste mit einem eigentlichen Abschabebereich und Abschabezähne (26). Im Winkel zu dieser Abschabeleiste ist ein Dosierleitblech (28) angeordnet, daß durch die Zähne der Abschabeleiste greift und an seinem unteren Ende Leitbleche zur Steuerung des Flusses des Entwicklergemisches aufweist.Two counter-rotating mixing screws (15, 22) from one another are arranged in a developer station in an electrophotographic printing device that works according to the principle of cross-mixing. The first mixing screw (15) is located in a plurality of mixing troughs (14) provided with inclined slots and has two mixing strips (17) that are offset by 180 ° in the feed area of the developer mixture. Above the two mixing screws (15, 22) there is a scraping bar with an actual scraping area and scraping teeth (26). A metering baffle (28) is arranged at an angle to this scraping bar, which reaches through the teeth of the scraping bar and has baffles at its lower end for controlling the flow of the developer mixture.

Description

Die Erfindung betrifft eine Mischvorrichtung zur Durchmi­schung eines aus Trägerteilchen und Toner bestehenden Ent­wicklers gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a mixing device for mixing a developer consisting of carrier particles and toner according to the preamble of patent claim 1.

Mischvorrichtungen der eingangs genannten Art sind allge­mein bekannt und mit Erfolg zur Anwendung gelangt. So wird in der deutschen Patentschrift 31 17 309 eine Mischvorrich­tung zur Durchmischung eines aus Trägerteilchen und Toner bestehenden Entwicklers beschrieben, die in der Entwickler­station eines nach dem elektrofotographischen Prinzip ar­beitenden Druckers Anwendung finden.Mixing devices of the type mentioned are well known and have been used successfully. German patent 31 17 309 describes a mixing device for mixing a developer consisting of carrier particles and toner, which is used in the developer station of a printer which works according to the electrophotographic principle.

Bei dieser nach dem Prinzip der Querdurchmischung arbeiten­den Mischvorrichtung wird der nachgeförderte Toner dem Ent­wickler in der Mischwanne über die gesamte Länge zugemischt und am Ende der Mischwanne einseitig dem Entwicklungsprozeß zugeführt. Da das mit zugeführtem Toner angereichterte Ent­wicklergemisch eine höhere Tonerkonzentration hat als der übrige Entwickler, kommt es durch die einseitige Zugabe des mit Toner angereicherten Entwicklers zu einer ungleichen Tonerkonzentrationsverteilung im Entwicklungsbereich. Als Folge davon können unzulässig hohe Einfärbungsunterschiede über die Schreibbreite auftreten. Dieser negative Effekt wird bei schwacher Einfärbung, hoher Druckbildauslastung und beim Drucken von Barcode besonders stark ausgeprägt.In this mixing device, which works on the principle of cross-mixing, the replenished toner is mixed into the developer in the mixing tank over the entire length and fed to the development process on one side at the end of the mixing tank. Since the developer mixture enriched with supplied toner has a higher toner concentration than the rest of the developer, the unilateral addition of the developer enriched with toner leads to an uneven distribution of the toner concentration in the development area. As a result, unacceptably high coloration differences across the width of the writing may occur. This negative effect is particularly pronounced in the case of weak coloring, high print image utilization and when printing barcodes.

Aufgabe der Erfindung ist es eine Mischvorrichtung der eingangs genannten Art so auszugestalten, daß der den Ent­ wickler zum Ladungsbildträger transportierenden Entwickler­walze über ihre gesamte Breite ein gleichmäßig durchge­mischtes Entwicklergemisch angeboten wird.The object of the invention is to design a mixing device of the type mentioned so that the Ent a uniformly mixed developer mixture is offered across the entire width to the developer roller transporting the charge image carrier.

Diese Aufgabe wird bei einer Mischvorrichtung der eingangs genannten Art gemäß dem kennzeichnenden Teil des ersten Pa­tentanspruches gelöst.This object is achieved in a mixing device of the type mentioned at the outset according to the characterizing part of the first claim.

Vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous embodiments of the invention are characterized in the subclaims.

Durch die Anordnung von Mischleisten die mehrere Stei­gungen der ersten Mischschnecke übergreifen und die im Ein­gangsbereich um 180° benachbart und axial versetzt in der Mischwanne angeordnet sind, kommt es zu einer Schnell­durchmischung des zugeführten Entwicklers. Über eine Viel­zahl von Öffnungen in der Mischwanne wird beim Transport des Entwicklers vom Eingangsbereich weg der Entwickler gleichmäßig der Mischkammer zugeführt.The arrangement of mixing strips which overlap several slopes of the first mixing screw and which are arranged in the entrance area adjacent to one another and axially offset in the mixing trough results in rapid mixing of the developer supplied. Through a multitude of openings in the mixing trough, the developer is evenly fed to the mixing chamber when the developer is transported away from the entrance area.

Bei einer vorteilhaften Ausführungsform der Erfindung weist die Mischwanne eine in Förderrichtung des Entwick­lers abnehmende Wannenhöhe auf, so daß ab einem vorgege­benen Füllgrad der Entwickler über den Rand der Mischwanne in die Mischkammer übertritt. Damit wird eine zusätzliche Gemischnivellierregelung bei unterschiedlichen Füllständen erreicht. Ein konstantes Gemischniveau sowohl in der Mischwanne als auch in der Mischkammer ist für eine über die Druckbreite gleichmäßige Einfärbung notwendig.In an advantageous embodiment of the invention, the mixing trough has a trough height that decreases in the conveying direction of the developer, so that the developer passes over the edge of the mixing trough into the mixing chamber from a predetermined filling level. An additional mixture level control is achieved with different levels. A constant mixture level both in the mixing tub and in the mixing chamber is necessary for a uniform coloring across the printing width.

Die Ausbildung der Abschabeleiste an der Entwicklerwalze in Form eines Abschabekammes der mit Abschabezähnen aus­gebildet ist und der sich nahezu über die gesamte Breite der Entwicklerwalze erstreckt, ermöglicht es den an der Entwicklerwalze anhaftenden Entwickler gleichmäßig zu ent­fernen und zur erneuten Durchmischung der Mischwanne zu­zuführen.The formation of the scraping bar on the developer roller in the form of a scraping comb which is formed with scraping teeth and which extends almost over the entire width of the developer roller enables the developer adhering to the developer roller to be removed evenly and fed to the mixing pan for renewed mixing.

Dieser Vorgang wird noch dadurch unterstützt, daß im Win­kel zur Abschabeleiste ein sich über den Bereich der Ab­schabezähne erstreckendes Dosierleitblech angeordnet ist, das den von den Abschabezähnen abgestreiften Entwickler einerseits über die Zahnzwischenräume der Mischkammer, andererseits über Ausnehmungen der Abschabeleiste der Mischwanne zuführt.This process is further supported in that a metering baffle extending over the area of the scraper teeth is arranged at an angle to the scraper bar, which feeds the developer stripped from the scraper teeth on the one hand through the interdental spaces of the mixing chamber and on the other hand via recesses in the scraper bar of the mixing trough.

Dadurch daß sich im Bereich der Mischleisten die Trans­portgeschwindigkeit des Entwicklers in der Mischwanne er­heblich reduziert und ferner ein sogenanntes Aufschwimmen des Toners verhindert wird, kann innerhalb einer kurzen Mischstrecke eine ausreichende Durchmischung des Toners erfolgen. Durch den kurzen Mischweg kann der mit Toner an­gereicherte Entwickler annähernd über die gesamte Ent­wicklerstationsbreite dem Entwicklungsprozeß gleichmäßig angeboten werden.As a result of the fact that the transport speed of the developer in the mixing trough is considerably reduced in the area of the mixing bars and that so-called floating of the toner is prevented, sufficient mixing of the toner can take place within a short mixing distance. Due to the short mixing path, the developer enriched with toner can be offered to the development process almost uniformly over the entire width of the developer station.

Der dosierte Übertritt des angereicherten Entwicklers in die Mischkammer bzw. den am Boden der Mischkammer ausge­bildeten Vorratsbereich wird durch definierte Schräg­schlitze in der Mischwanne bewirkt. Durch die definierte Breite der Schlitze wird ein Übertreten von noch nicht un­tergemischten Tonerklümpchen in den Vorratsbereich verhin­dert.The metered transfer of the enriched developer into the mixing chamber or the storage area formed at the bottom of the mixing chamber is brought about by defined inclined slots in the mixing trough. The defined width of the slits prevents toner clumps that have not yet been mixed into the supply area from passing over.

Unterhalb der Abschabeleiste sind Leitbleche angeordnet, die die Aufgabe haben den nicht abgeschabten Anteil des sich auf der Entwicklerwalze befindlichen Entwicklers im Vorratsbereich der Mischkammer eine bestimmte Fließrich­tung zu geben. So wird im Zusammenspiel mit der zweiten Mischschnecke im Vorratsbereich der Mischkammer eine gleichmäßige Entwicklerverteilung und ein rasches Durch­wandern des Entwicklers erreicht.Below the scraper bar, baffles are arranged, which have the task of giving the non-scraped off portion of the developer located on the developer roller in the storage area of the mixing chamber a certain flow direction. In cooperation with the second mixing screw in the storage area of the mixing chamber, a uniform developer distribution and a rapid migration of the developer is achieved.

Der über das Dosierleitblech und die daran ausgebildeten Leitbleche gesteuerte Gemischstrom ermöglicht es die Schrägschlitze in der Mischwanne auf Seiten des Vorratsbe­reiches der Mischkammer von Entwicklern freizuhalten. Da­mit fällt der Entwickler ohne Störungen in den Vorratsbe­reich der Mischkammer.The mixture flow, which is controlled via the metering baffle and the baffles formed thereon, enables this Keep slanted slots in the mixing trough on the side of the storage area of the mixing chamber free from developers. The developer thus falls into the storage area of the mixing chamber without interference.

Neben der Verbesserung der Querdurchmischung wird mit der beschriebenen Vorrichtung eine automatische Gemischent­leerung durch die feststehende Abschabeleiste erreicht. Damit entfällt ein übliches Verschwenken bzw. die Anord­nung eines Entleerbleches.In addition to improving the cross-mixing, the device described also achieves automatic mixture emptying through the fixed scraper bar. This eliminates the usual pivoting or the arrangement of an emptying plate.

Eine Ausführungsform der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden beispielsweise näher be­schrieben. Es zeigen

  • Fig. 1 eine schematische Schnittdarstellung der Mischvor­richtung und
  • Fig. 2 eine Ansicht der Mischvorrichtung von schräg oben.
An embodiment of the invention is shown in the drawings and is described in more detail below, for example. Show it
  • Fig. 1 is a schematic sectional view of the mixing device and
  • Fig. 2 is an oblique view of the mixing device from above.

In einer hier nicht im einzelnen dargestellten nach dem Prinzip der Elektrofotographie arbeitenden Druckeinrich­tung ist eine nach dem Prinzip der Querdurchmischung ar­beitende Entwicklerstation angeordnet. Die Entwickler­station 10 befindet sich benachbart zu einem hier nicht dargestellten Ladungsbildträger der aus einer Fotoleiter­trommel besteht und die in bekannter Weise über eine Erst­wicklerwalze 11 (Magnetbürstenprinzip) eingefärbt wird. Die Entwicklerstation 10 enthält eine eigentliche Misch­kammer 12 mit einem darin angeordneten, am Boden der Ent­wicklerstation befindlichen Vorratsbereich 13 und einer Mischwanne 14. In der Mischwanne 14 ist eine erste elektro­motorisch angetriebene Mischschnecke 15 angeordnet, die im Zuführbereich des Entwicklergemisches 16 zwei um 180° zu­einander und axial versetzte Mischleisten 17 aufweist, die jeweils mehrere Windungen 18 der ersten Mischschnecke über­spannen. Die Mischwanne 14 weist außerdem entlang der er­ sten Mischschnecke angeordnete Schrägschlitze 19 auf. Die Mischwanne 14 hat eine in Förderrichtung eines Entwickler­gemisches 20 abnehmende Wannenhöhe 21, deren Funktion spä­ter beschrieben wird.In a printing device, which is not shown here in detail and operates according to the principle of electrophotography, a developer station operating according to the principle of cross-mixing is arranged. The developer station 10 is located adjacent to a charge image carrier (not shown here) which consists of a photoconductor drum and which is dyed in a known manner via a first winding roller 11 (magnetic brush principle). The developer station 10 contains an actual mixing chamber 12 with a storage area 13 and a mixing trough 14 arranged in it at the bottom of the developer station has axially offset mixing strips 17, each spanning a plurality of turns 18 of the first mixing screw. The mixing pan 14 also has along it Most mixing screw arranged inclined slots 19. The mixing trough 14 has a trough height 21 which decreases in the conveying direction of a developer mixture 20, the function of which will be described later.

Innerhalb der Mischkammer 12 und unterhalb der ersten Mischschnecke befindet sich in dem Vorratsbereich 13 der Entwicklerstation eine zweite Mischschnecke 22 die eben­falls mit Windungen versehen ist. Die zweite Mischschnecke 22 ist gegenüber der Entwicklerwalze (Magnetwalze) über ein Schutzblech 23 abgedeckt. Oberhalb der beiden Misch­schnecken befindet sich eine langgestreckte Abschabeleiste 24 mit einem eigentlichen Abschabebereich 25 und einem Be­reich der in Form eines Abschabekammes mit einzelnen Ab­schabezähnen 26 ausgebildet ist. Auf den in der Nähe des Zufuhrbereiches 16 angeordneten Abschabebereiches 25 der Abschabeleiste 24 ist als Leiteinrichtung ein Leitblech 27 angeordnet.Within the mixing chamber 12 and below the first mixing screw there is a second mixing screw 22 in the storage area 13 of the developer station, which is also provided with turns. The second mixing screw 22 is covered with a protective plate 23 opposite the developer roller (magnetic roller). Above the two mixing screws there is an elongated scraping bar 24 with an actual scraping area 25 and an area which is designed in the form of a scraping comb with individual scraping teeth 26. A baffle 27 is arranged as a guide device on the scraping area 25 of the scraping bar 24 arranged in the vicinity of the feed area 16.

Im Winkel zur Abschabeleiste 24 befindet sich ein über den Bereich der Abschabezähne 26 erstreckendes Dosierleitblech 28, das die Abschabezähne 26 der Abschabeleiste 24 durch­greift und dabei über den Zähnen 26 Durchgangsöffnungen 29 offen läßt. Das Dosierleitblech 28 weist an seinem unteren Teil Leitbleche 30 auf. Das Dosierleitblech 28 ist dabei zusammen mit den Leitblechen 30 einstückig ausgebildet, wo­bei die Leitbleche die Form von geschränkten Schaufeln ha­ben.At an angle to the scraping bar 24 there is a metering guide plate 28 which extends over the area of the scraping teeth 26 and which passes through the scraping teeth 26 of the scraping bar 24 and thereby leaves through openings 29 open above the teeth 26. The metering baffle 28 has baffles 30 on its lower part. The metering baffle 28 is formed in one piece together with the baffles 30, the baffles being in the form of set blades.

Bei laufender Entwicklerstation wird mit Hilfe der Abscha­beleiste 24 und zwar über den Abschabebereich 25 und das Leitblech 27 Tonergemisch dem Tonerzuführungsbereich 16 der Mischwanne 14 zugeführt. Hier erfolgt die rasche Un­termischung des nachgeförderten Toners mittels der um 180° versetzten und in Achsrichtung der ersten Mischschnecke 15 verschobenen Mischleisten 17. Durch die Mischleisten 17 wird die Transportgeschwindigkeit des Wicklergemisches in der Mischwanne 14 erheblich reduziert und ferner ein so­genanntes Aufschwimmen des Toners verhindert. Damit kann innerhalb einer kurzen Mischstrecke eine ausreichende Ein­mischung von Toner und zwar sowohl von frischem Toner als auch von Toner aus der Entwicklerstation erfolgen. Durch den kurzen Mischweg ist es möglich den mit zugeführtem To­ner angereicherten Entwickler annähernd über die gesamte Entwicklerstationsbreite dem Entwicklungsprozeß gleichmä­ßig anzubieten. Dies wird ermöglicht durch den dosierten Übertritt des angereicherten Entwicklers 20 in den Vor­ratsbereich 13 der Entwicklerstation 10 über die definier­ten Schrägschlitze 19 in der Mischwanne 14. Als günstig ha­ben sich Schrägschlitze 19 mit den Abmaßen von 25 × 1,1 mm einen Neigungswinkel von 45° und einer Teilung von 10 mm erwiesen. Eine bestimmte Geometrie und Lage der Mischwanne 14 und der Schrägschlitze 19 ist aus funktionellen Gründen von Bedeutung. So wird durch die definierte Breite der Schrägschlitze 19 ein Übertreten von noch nicht unterge­mischten Tonerklümpchen in den Vorratsbereich 13 verhin­dert.With the developer station running, the scraper bar 24 is used to deliver the toner mixture to the toner supply area 16 of the mixing trough 14 via the scraper area 25 and the guide plate 27. Here, the replenished toner is rapidly mixed in by means of the mixing bars 17, which are offset by 180 ° and displaced in the axial direction of the first mixing screw 15 the mixing tub 14 significantly reduced and also prevents a so-called floating of the toner. Sufficient mixing of toner, both fresh toner and toner from the developer station, can thus take place within a short mixing distance. Due to the short mixing path, it is possible to offer the developer enriched with supplied toner almost uniformly over the entire developer station range to the development process. This is made possible by the metered passage of the enriched developer 20 into the storage area 13 of the developer station 10 via the defined inclined slots 19 in the mixing trough 14. As advantageous, inclined slots 19 with the dimensions of 25 × 1.1 mm have an inclination angle of 45 ° and with a pitch of 10 mm. A certain geometry and position of the mixing trough 14 and the oblique slots 19 is important for functional reasons. The defined width of the oblique slits 19 thus prevents toner clumps which have not yet been mixed in from entering the storage area 13.

Durch die in Förderrichtung des Gemisches 20 abnehmende Wannenhöhe der Mischwanne 14 kann ab einem bestimmten Füllgrad definiert Entwicklergemisch 20 über den Rand der Mischwanne 14 in den Vorratsbereich 13 übertreten. Damit wird eine zusätzliche Gemischnivellierung bei unterschied­lichen Füllständen erreicht. Weiters kann im Bereich der Mischwanne 14 ab einem bestimmten Gemischfüllstand im Vor­ratsbereich 13 Entwickler über eine Ausklinkung 31 (Aus­nehmung) der Mischwanne in den Bereich der Mischschnecke 15 übertreten, wodurch ein Gemischstau im Vorratsbereich 13 vermieden wird. Ein konstantes Gemischniveau sowohl in der Mischwanne 14 als auch im Vorratsbereich 13 ist für eine über die Druckbreite gleichmäßige Einfärbung not­wendig.As a result of the trough height of the mixing trough 14 decreasing in the conveying direction of the mixture 20, from a certain filling level, developer mixture 20 can pass over the edge of the mixing trough 14 into the storage area 13. An additional mixture leveling with different fill levels is thus achieved. Furthermore, in the area of the mixing tub 14, from a certain mixture fill level in the storage area 13, developers can pass through a notch 31 (recess) in the mixing tub into the area of the mixing screw 15, thereby preventing a mixture build-up in the storage area 13. A constant mixture level both in the mixing trough 14 and in the storage area 13 is necessary for a uniform coloring over the printing width.

Um das Gemischniveau in der Mischwanne 14 konstant zu hal­ten, wird durch die Abschabezähne 26 der Abschabeleiste 24 in Verbindung mit den Durchgangsöffnungen des Dosierleit­bleches 28 in etwa die Menge an Entwickler der Mischwanne 14 zugegeben, die durch die Schrägschlitze 19 der Misch­wanne 14 in den Vorratsbereich 13 tritt.In order to keep the mixture level in the mixing trough 14 constant, the scraping bar 24 is moved through the scraping teeth 26 in connection with the through openings of the metering baffle 28, approximately the amount of developer of the mixing trough 14 is added, which passes through the oblique slots 19 of the mixing trough 14 into the storage area 13.

Die Leitbleche 27 am unteren Bereich der des Dosierleit­bleches 28, die die Form von geschränkten Schaufeln haben, haben die Aufgabe dem nicht abgeschabten Anteil des sich auf der Entwicklerwalze befindlichen Entwicklers im Vor­ratsbereich 13 eine bestimmte Fließrichtung zu geben. So wird im Zusammenspiel mit der zweiten Mischschnecke 22 im Vorratsbereich 13 eine gleichmäßige Entwicklerverteilung und ein rasches Durchwandern des Entwicklers erreicht. Die beiden Mischschnecken bewegen sich beim Durchmischvorgang in entgegengesetzter Drehrichtung (Pfeilrichtung). Die durch den Mischvorgang auftretenden Strömungsrichtungen des Entwicklergemisches sind in den Zeichnungen als mit EF (Entwicklerfluß) bezeichnete Pfeile dargestellt.The baffles 27 at the lower area of the metering baffle 28, which have the shape of set blades, have the task of giving the uns scraped portion of the developer located on the developer roller in the storage area 13 a certain flow direction. In cooperation with the second mixing screw 22 in the storage area 13, a uniform developer distribution and a rapid migration of the developer is achieved. The two mixing screws move in the opposite direction of rotation (arrow direction) during the mixing process. The flow directions of the developer mixture that occur as a result of the mixing process are shown in the drawings as arrows labeled EF (developer flow).

Claims (9)

1. Mischvorrichtung zur Durchmischung eines aus Trägerteil­chen und Toner bestehenden Entwicklers (20) zur Entwicklung von auf einem Ladungsbildträger aufgebrachten Ladungsbil­dern in einer Entwicklerstation (10) die in einer Mischkam­mer (12) eine parallel zu einer Entwicklerwalze (11) ange­ordnete erste Mischschnecke (15) aufweist, die den Entwick­ler unter Durchmischung in einer Mischwanne (14) von einem Zuführungsbereich aus parallel zur Entwicklerwalze (11) be­wegt, mit einer zweiten unterhalb der ersten Mischschnecke (15) angeordneten Mischschnecke (22) zur Rückführung des Entwicklers entlang der Entwicklerwalze (11), wobei die Entwicklerwalze (11) ständig einen Teil des Entwicklers von der Entwicklerwalze zum Ladungsbildträger transportiert und eine oberhalb der Mischschnecke angeordnete Abschabeleiste (24), die an der Entwicklerwalze anhaftenden Entwickler aufnimmt und über eine Leiteinrichtung (27) zumindest teil­weise der ersten Mischschnecke (15) zuführt,
dadurch gekennzeichnet, daß minde­stens im Zuführungsbereich (16) der Mischwanne (14) der er­sten Mischschnecke (15) mehrere Steigungen der Mischschnecke (15) übergreifende Mischleisten (17) zur schnellen Durch­mischung des zugeführten Entwicklers (20) aufweist und daß die Mischwanne (14) eine Vielzahl von Öffnungen (19) auf­weist, über die der Entwickler der zweiten Mischschnecke (22) im wesentlichen über die gesamte Breite der Misch­schnecke (22) zugeführt wird.1. Mixing device for mixing a developer (20) consisting of carrier particles and toner for developing charge images applied to a charge image carrier in a developer station (10) which in a mixing chamber (12) has a first mixing screw (15) arranged parallel to a developer roller (11). which moves the developer while mixing in a mixing trough (14) from a feed area parallel to the developer roller (11), with a second mixing screw (22) arranged below the first mixing screw (15) for returning the developer along the developer roller (11) , wherein the developer roller (11) constantly transports part of the developer from the developer roller to the charge image carrier and a scraping bar (24) arranged above the mixing screw, which picks up the developer adhering to the developer roller and at least partially the first mixing screw (15) via a guide device (27) ) feeds
characterized in that at least in the feed area (16) of the mixing trough (14) of the first mixing screw (15) has multiple slopes of the mixing screw (15) spanning mixing strips (17) for rapid mixing of the supplied developer (20) and that the mixing trough (14) has a multiplicity of openings (19) through which the developer is fed to the second mixing screw (22) essentially over the entire width of the mixing screw (22). 2. Mischvorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß die Mischleisten (17) um 180° radial und in Achsrichtung ver­setzt zueinander angeordnet sind.2. Mixing device according to claim 1,
characterized in that the mixing strips (17) are arranged at 180 ° radially and offset from one another in the axial direction. 3. Mischvorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die Mischwanne (14) eine in Förderrichtung des Entwicklers ab­ nehmende Wannenhöhe aufweist, so daß ab einem vorgegebenen Füllgrad Entwickler (20) über den Rand der Mischwanne (14) in die Mischkammer (12) übertritt.3. Mixing device according to claim 1 or 2,
characterized in that the mixing trough (14) extends in the direction of conveyance of the developer has increasing tub height, so that from a predetermined filling level developer (20) passes over the edge of the mixing tub (14) into the mixing chamber (12). 4. Mischvorrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Ab­schabeleiste (24) mindestens teilweise in Form eines Ab­schabekammes mit Abschabezähnen (26) ausgebildet ist.4. Mixing device according to one of claims 1 to 3,
characterized in that the scraping strip (24) is at least partially in the form of a scraping comb with scraping teeth (26). 5. Mischvorrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß im Win­kel zur Abschabeleiste (24) ein sich über den Bereich der Abschabezähne (26) erstreckendes Dosierleitblech (28) an­geordnet ist, daß den von den Abschabezähnen (26) abge­streiften Entwickler über die Zahnzwischenräume der Misch­kammer (14) bzw. über Durchgangsöffnungen (29) der Abscha­beleiste (24) der Mischwanne (14) zuführt.5. Mixing device according to claim 4,
characterized in that a metering baffle (28) extending over the area of the scraper teeth (26) is arranged at an angle to the scraper bar (24), that the developer stripped from the scraper teeth (26) passes over the interdental spaces of the mixing chamber (14) or Feed-through openings (29) of the scraping bar (24) of the mixing tub (14). 6. Mischvorrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß unter­halb der Abschabeleiste (24) Leitbleche (30) angeordnet sind.6. Mixing device according to claim 4,
characterized in that baffles (30) are arranged below the scraping strip (24). 7. Mischvorrichtung nach Anspruch 6,
dadurch gekennzeichnet, daß das Do­sierleitblech die Abschabezähne (26) durchgreift und an seinem unterhalb der Abschabeleiste angeordneten Bereich die Leitbleche in Form von geschränkten Schaufeln (30) ausgebildet sind.7. Mixing device according to claim 6,
characterized in that the metering baffle extends through the scraping teeth (26) and the baffles are in the form of set blades (30) on the area below the scraping bar. 8. Mischvorrichtung nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, daß die Öffnungen der Mischwanne (14) als Schrägschlitze (19) ausgebildet sind.8. Mixing device according to one of claims 1 to 7,
characterized in that the openings of the mixing trough (14) are designed as oblique slots (19). 9. Mischvorrichtung nach Anspruch 5,
dadurch gekennzeichnet, daß die Abschabeleiste (24) und das Dosierleitblech (27) derart dimensioniert sind, daß die Menge des dadurch der Misch­wanne (14) zugeführten Entwicklers in etwa der Entwick­lermenge entspricht, die durch die Schrägschlitze (19) der Mischwanne (14) austritt.9. Mixing device according to claim 5,
characterized in that the Scraper strip (24) and the metering guide plate (27) are dimensioned such that the amount of developer fed thereby to the mixing trough (14) corresponds approximately to the amount of developer that exits through the oblique slots (19) of the mixing trough (14).
EP87100411A 1986-01-17 1987-01-14 Mixing device for cross-mixing developer mix in development units of electrophotographic printing systems Expired - Lifetime EP0233469B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3601328 1986-01-17
DE3601328 1986-01-17

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EP0233469A1 true EP0233469A1 (en) 1987-08-26
EP0233469B1 EP0233469B1 (en) 1990-03-28

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EP (1) EP0233469B1 (en)
JP (1) JPS62195689A (en)
DE (1) DE3762071D1 (en)

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US4965639A (en) * 1989-10-25 1990-10-23 Xerox Corporation Toner supply cartridge for reproduction and printing machines
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WO2009028633A1 (en) 2007-08-28 2009-03-05 Toshiba Carrier Corporation Multicylinder rotary type compressor, and refrigerating cycle apparatus
CN101688536B (en) 2007-08-28 2011-12-21 东芝开利株式会社 Rotary compressor and refrigeration cycle device
CN102472281B (en) 2009-09-11 2015-01-14 东芝开利株式会社 Multiple cylinder rotary compressor and refrigeration cycle device
JP5856037B2 (en) * 2012-10-25 2016-02-09 株式会社ヨシカワ Metering feeder

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EP0233469B1 (en) 1990-03-28
JPS62195689A (en) 1987-08-28
US4784081A (en) 1988-11-15

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