EP0877973B1 - Device for applying release agent to the surface of a fixing roller of an electrographic printer or copier - Google Patents

Device for applying release agent to the surface of a fixing roller of an electrographic printer or copier Download PDF

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Publication number
EP0877973B1
EP0877973B1 EP96934383A EP96934383A EP0877973B1 EP 0877973 B1 EP0877973 B1 EP 0877973B1 EP 96934383 A EP96934383 A EP 96934383A EP 96934383 A EP96934383 A EP 96934383A EP 0877973 B1 EP0877973 B1 EP 0877973B1
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EP
European Patent Office
Prior art keywords
supply roll
applicator element
sensor
speed
fixing roller
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
EP96934383A
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German (de)
French (fr)
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EP0877973A1 (en
Inventor
Joachim Hoffmann
Stephen Nicholas Huntley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Production Printing Germany GmbH and Co KG
Original Assignee
Oce Printing Systems GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP0877973A1 publication Critical patent/EP0877973A1/en
Application granted granted Critical
Publication of EP0877973B1 publication Critical patent/EP0877973B1/en
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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
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
    • G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
    • G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
    • G03G15/2025—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means with special means for lubricating and/or cleaning the fixing unit, e.g. applying offset preventing fluid
    • 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
    • Y10S118/00—Coating apparatus
    • Y10S118/01—Anti-offset

Definitions

  • the invention relates to a release agent application device.
  • the release agent application device carries on the surface a fusing roller one working on the transfer printing principle electrographic printer or copier separating liquid on.
  • charge images are used on an intermediate carrier, e.g. a photoconductor drum generated, which is then due to electrostatic or magnetic forces with a developer mixture of a developer station be colored.
  • the colored charge images are transferred to a recording medium in a transfer printing station reprinted in the form of single sheets or continuous paper and then thermally fixed.
  • thermal Fixation is known from US-A-33 24 791, a fixing station to be used with two rollers, between which the carrier of the Toner image is moved through. The one facing the toner image Fuser roller is heated, the other presses the carrier with the toner image against the fuser roller. Through warmth and Pressure is then melted down the toner.
  • separating liquid e.g. Wet silicone oil.
  • a release agent application device from DE-C-39 42 147 known in which a felt Application element from one along the fuser roller extending pressure body pressed against the fixing roller becomes.
  • a metering tube is provided, which in its Includes longitudinal openings. In the dosing tube pumped release agent emerges from the openings and reaches the application element.
  • the application element picks up the release agent and hands it over to the surface of the fuser roller.
  • the receptivity will through the material, through the material thickness and the degree of contamination certainly.
  • a supply roll is provided on the the fleece is wound up.
  • a take-up roll winds up dirty Fleece back on.
  • the transport speed of the fleece is constant Rotation speed of the pickup roller determined.
  • the transport speed of the fleece therefore increases with increasing diameter of the take-up roll.
  • the cleaning effect of the fleece increases with the transport speed of the fleece.
  • the transport speed of the Fleece is therefore designed so that the lower speed at the beginning of the fleece is just enough to to achieve a sufficient cleaning effect.
  • the present invention is therefore based on the object a release agent application device for applying Release agent on the surface of a fixing roller of an electrographic To design printing or copying machine so that with a constant and reliable cleaning effect Extension of the maintenance intervals is achieved.
  • the application element is wound on a supply roll.
  • a sensor is coupled to the supply roll, which measures the speed of rotation for example in the form of pulses. It outputs these impulses to a control unit which in turn the speed of an engine that is the take-up roll drives, controls.
  • the control unit are therefore the Rotation speeds of both roles known. About that the total length of the application element is also known. Out
  • the control unit calculates the actual values from these values Speed of the application element and compares it with a target speed. The control unit slows down or accelerates the engine speed according to the comparison result, so that the result is a constant transport speed of the application element, that of the target speed corresponds, is achieved.
  • control unit also the end of the application element.
  • the end of the application element was like this designed to operate a shutdown switch as soon as it was withdrawn from the supply roll. There were failures of the switch to be operated, so that the end of the application element in contact with the surface of the fuser roller came. With the appropriate design of the end, for example, a ledge was attached there for destruction the fuser roller.
  • the control unit recognizes the end of the application elements the standstill or the slowing down of the supply roll and then switches off the engine. In addition, a corresponding message to the central control of the electrographic Printing or copying device are output.
  • a fleece with a thickness between 0.2 to 0.3 mm serves as a request element a fleece with a thickness between 0.2 to 0.3 mm.
  • This fleece is much thinner than conventional fleeces.
  • Polyamide, polyimide and Teflon or combinations thereof are used.
  • a longer length can be achieved by means of the thin fleece of the fleece can be wound up in a small space. With unchanged Maintenance intervals is due to the increased fleece length an increased fleece speed can be realized. This is ensures a higher quality of cleaning the fuser roller, because the fleece is not blocked by dirt can be.
  • the thin fleece enables quick and direct fuser roller lubrication.
  • a particular advantage shows improved capillary action and absorbency.
  • the transfer of the release agent to the fleece using the Wicks ensure optimal wetting of the fleece independently of thermal and geometric tolerances.
  • Printer or copier is in a heat setting station a release agent application device shown in Figure 1 for applying release agent L to the surface of a Fuser roller assigned.
  • the basic diagram shows the Fuser roller F, which rotates clockwise. Not shown are the pressure roller of the fuser and the between recording media guided on both rollers. Shown but is the device for applying release agent the surface of the fusing roller F. serves as application element V. a fleece that has a thickness of 0.2 to 0.3 mm. It exists made of polyamide, polyimide or Teflon.
  • the application element V carries silicone oil or another suitable heat resistant Release agent in liquid form preferably on the whole Surface of the fuser roller F on. To ensure this extends the application element V with its entire Width over the entire axial length of the fixing roller F.
  • Das Application element V is also in a predetermined Circumferential area applied to the fixing roller F.
  • application element V In the operating state, application element V is always available the surface of the fixing roller F in contact. That takes Application element V dirt particles, such as Toner particles or dust carried by the recording medium. To one To ensure proper functioning, as described below in 3 explained in more detail, preferably the the area of the application element V lying against the fixing roller F. either continuously slow, but possibly also in intervals renewed in sections.
  • the take-up roll AV is e.g. driven by a motor MO.
  • the one caused by the MO motor Transport direction of application element V runs the movement the fuser roller F so that the used application element V all by stripping from the surface of the Fuser roller F carries contaminations and always a sufficient area of relatively fresh application elements V is available.
  • These leadership elements UB, OB are arranged vertically one above the other, so that from an upper guide element OB and a lower one Guide element UB can be spoken.
  • the two leadership elements OB, UB are represented by springs S1, S2, which are in the area the end faces of the guide elements UB, OB arranged are pressed to the surface of the fixing roller F.
  • OB perform another task.
  • the wick D is in touch contact with the application element V, whereby release agent L can be included in the application element. This can do that Dispense release agent L to the fixing roller F.
  • the recording role AV is counterclockwise by a motor MO driven.
  • the speed of rotation of the supply roll VV is detected by a sensor H.
  • the speed of the motor MO is determined by a control device CON.
  • This control device CON is coupled to sensor H and evaluates the information provided by the sensor.
  • the diameter of the take-up roll AV is correspondingly low, since there is only one, for example Location of application element V on the AVR receiving tube Recording roll AV is located.
  • a constant engine speed would a constant speed of rotation of the receiving tube AVR Have consequence.
  • the transport speed would then increase of the application element.
  • the diameter of the Recording roll AV increases, the diameter of the decreases Supply roll VV. Their rotational speed increases accordingly when processing the application element V, if you have a constant Speed of application element V presupposes.
  • the control unit CON is due to the presence of the sensor H. Information the rotation speed of the supply roll VV known. The speed of rotation of the take-up roll AV determines the control unit CON itself, why this rotational speed is also known.
  • the control unit compares the engine speed with the speed of the Supply role VV and determines the extent to which the application element V has already been processed. From this she calculates the Diameter of the supply roll VV. From the diameter of the supply roll VV and its speed is the actual speed of application element V can be calculated. This actual Speed of application element V is with a Setpoint compared. The actual value deviates from the target value the control unit CON adjusts the speed of the motor MO accordingly. If the MO motor is one Stepper motor, the on / off duration of this is accordingly Stepper motor MO changed.
  • Hall sensor H is in accordance with Figure 2 arranged on the front side of the supply roll W.
  • a circular disc HS coaxial with a pin HSS are evenly spaced on the from the face of the supply roll facing away from the individual Arranged magnets or a magnetic ring.
  • the HSS pen penetrates into the axis VVA of the supply roll VV coaxially and so coupled with this that the pin HSS the rotational movement of the Axis of the supply roll VV transfers to the disc HS.
  • the Magnet HM on the disc HS is a Hall element HL assigned. It is located in the immediate vicinity Proximity to the magnet HM rotating around the pin HSS.
  • the safe function of the Hall sensor HL can only be guaranteed if both in the radial and in the axial direction very tight tolerances, for example +/- 0.2 millimeters with respect the distance to the magnets HM are observed. These narrow tolerances are met in that the HSS pin from the surface of the disc HS a defined Protrudes length. This part of the HSS is located on the same side as the magnets HM.
  • the HSS pen has an axial bore HB in this area, in which a HLS pin connected to the Hall sensor HL can be introduced.
  • the Hall sensor HL is arranged on the side of the plate HP.
  • the Plate HP is based on a fixed angle HW, see above that a rotational movement of the coupled to the disc HS HSS pin not on the pin coupled to the HP plate HLS is transmitted and thus a fixed position of the Hall sensor HL is reached in the radial direction.
  • the plate HP is HF by a spring axially on the end face of the coupled with the disc HS HSS pin pressed.
  • the spring HF is based on the stationary Angle HW from.
  • the sensor H can also be constructed in the reverse manner.
  • a magnet HM can be arranged on the plate HP. Accordingly, HS would have to be on the disc instead of the magnets HM a plurality of Hall sensors HL are arranged.
  • a single one can be placed on the disc HS Magnet can be arranged and the plate HP as large be carried out that a plurality of Hall sensors HL can be arranged in a fixed position. The rotating magnet would then influence the majority of Hall sensors HL on its way.
  • the sensor H thus detects any movement of the supply roll VV. Depending on the speed of rotation are in certain Intervals of electrical impulses to the control unit CON submitted. Receives the control unit CON in the known Time intervals no pulses from sensor H, though the motor MO drives the take-up roller AV, recognizes the control unit CON the end of the application element V. The control unit CON issues a corresponding message to the controller of the Printing or copying machine, so that a new role with the application element V can be inserted into the device.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)

Description

Beschreibungdescription

Die Erfindung betrifft eine Trennmittelauftragsvorrichtung. Die Trennmittelauftragsvorrichtung trägt auf die Oberfläche einer Fixierwalze eines nach dem Umdruckprinzip arbeitenden elektrografischen Druck- oder Kopiergerätes Trennflüssigkeit auf.The invention relates to a release agent application device. The release agent application device carries on the surface a fusing roller one working on the transfer printing principle electrographic printer or copier separating liquid on.

Bei elektrografischen Druck- oder Kopiergeräten werden Ladungsbilder auf einem Zwischenträger, z.B. einer Fotoleitertrommel erzeugt, die dann auf Grund elektrostatischer oder magnetischer Kräfte mit einem Entwicklergemisch einer Entwicklerstation eingefärbt werden. Die eingefärbten Ladungsbilder werden in einer Umdruckstation auf einen Aufzeichnungsträger in Form von Einzelblättern oder Endlospapier umgedruckt und anschließend thermisch fixiert. Zur thermischen Fixierung ist aus US-A-33 24 791 bekannt, eine Fixierstation mit zwei Walzen zu verwenden, zwischen denen der Träger des Tonerbildes hindurchbewegt wird. Die eine dem Tonerbild zugewandte Fixierwalze wird erhitzt, die andere drückt den Träger mit dem Tonerbild gegen die Fixierwalze. Durch Wärme und Druck wird dann der Toner eingeschmolzen.In electrographic printing or copying machines, charge images are used on an intermediate carrier, e.g. a photoconductor drum generated, which is then due to electrostatic or magnetic forces with a developer mixture of a developer station be colored. The colored charge images are transferred to a recording medium in a transfer printing station reprinted in the form of single sheets or continuous paper and then thermally fixed. For thermal Fixation is known from US-A-33 24 791, a fixing station to be used with two rollers, between which the carrier of the Toner image is moved through. The one facing the toner image Fuser roller is heated, the other presses the carrier with the toner image against the fuser roller. Through warmth and Pressure is then melted down the toner.

Um zu verhindern, daß Toner an der Oberfläche der Fixierwalze hängenbleibt, wird deren Oberfläche mit Trennflüssigkeit, z.B. Silikonöl benetzt. Zum Aufbringen dieser Trennflüssigkeit auf die Fixierwalze ist aus DE-C-39 42 147 eine Trennmittelauftragsvorrichtung bekannt, bei der ein aus Filz bestehendes Antragselement von einem sich längs der Fixierwalze erstreckenden Andruckkörper gegen die Fixierwalze gedrückt wird. Auf der von der Fixierwalze abgewandten Seite des Antragselements ist ein Dosierrohr vorgesehen, das in seiner Längserstreckung Austrittsöffnungen enthält. In das Dosierrohr gepumptes Trennmittel tritt aus den Öffnungen aus und gelangt so auf das Antragselement.To prevent toner from appearing on the surface of the fuser roller gets stuck, its surface is covered with separating liquid, e.g. Wet silicone oil. To apply this separation liquid on the fixing roller is a release agent application device from DE-C-39 42 147 known in which a felt Application element from one along the fuser roller extending pressure body pressed against the fixing roller becomes. On the side of the application element facing away from the fixing roller a metering tube is provided, which in its Includes longitudinal openings. In the dosing tube pumped release agent emerges from the openings and reaches the application element.

Das Antragselement nimmt das Trennmittel auf und übergibt es zur Oberfläche der Fixierwalze. Die Aufnahmefähigkeit wird durch das Material, durch die Materialdicke und den Materialverschmutzungsgrad bestimmt. Es werden als Antragselemente dicke Vliese verwendet. Diese können eine bestimmte Menge Schmutz aufnehmen. Mit zunehmender Verunreinigung wird das Vlies jedoch immer weniger Trennmittel zur Fixierwalze durchlassen, so daß es im Extremfall die Zufuhr von Trennmittel zur Fixierwalze verhindert. Aus diesem Grund wird das Vlies kontinuierlich oder in zeitlichen Abständen erneuert. Dazu ist bei DE 38 42 147 eine Vorratsrolle vorgesehen, auf der das Vlies aufgewickelt ist. Eine Aufnahmerolle wickelt verschmutztes Vlies wieder auf.The application element picks up the release agent and hands it over to the surface of the fuser roller. The receptivity will through the material, through the material thickness and the degree of contamination certainly. There are application elements thick fleece used. These can be a certain amount Pick up dirt. With increasing pollution that becomes Nonwoven, however, let less and less release agent through to the fixing roller, so that in extreme cases there is the supply of release agents to the fuser roller prevented. For this reason, the fleece renewed continuously or at intervals. To DE 38 42 147 a supply roll is provided on the the fleece is wound up. A take-up roll winds up dirty Fleece back on.

Die Transportgeschwindigkeit des Vlieses ist durch die konstante Rotationsgeschwindigkeit der Aufnahmerolle bestimmt. Die Transportgeschwindigkeit des Vlieses erhöht sich deshalb mit zunehmendem Durchmesser der Aufnahmerolle. Die Reinigungswirkung des Vlieses erhöht sich mit der Transportgeschwindigkeit des Vlieses. Die Transportgeschwindigkeit des Vlieses ist deshalb so ausgelegt, daß die geringere Geschwindigkeit am Anfang des Vlieses gerade noch ausreichend ist, um eine ausreichende Reinigungswirkung zu erzielen. Obwohl die Länge des Vlieses aufgrund seiner Dicke und den damit verbundenen räumlichen Einschränkungen relativ gering ist, kommt es gegen Ende des Vliesvorrates zu einer so hohen Transportgeschwindigkeit des Vlieses, die zum Erzielen einer befriedenden Reinigungswirkung zu hoch ist. Dies bedingt einen häufigen Ersatz des Vlieses und damit kurze Wartungsintervalle.The transport speed of the fleece is constant Rotation speed of the pickup roller determined. The transport speed of the fleece therefore increases with increasing diameter of the take-up roll. The cleaning effect of the fleece increases with the transport speed of the fleece. The transport speed of the Fleece is therefore designed so that the lower speed at the beginning of the fleece is just enough to to achieve a sufficient cleaning effect. Although the Length of the fleece due to its thickness and the associated spatial restrictions is relatively small, it happens towards the end of the fleece stock at such a high transport speed of the fleece, which is used to achieve a satisfactory Cleaning effect is too high. This requires a frequent Replacement of the fleece and therefore short maintenance intervals.

Der vorliegenden Erfindung liegt deshalb die Aufgabe zugrunde, eine Trennmittelauftragsvorrichtung zum Auftragen von Trennmittel auf die Oberfläche einer Fixierwalze eines elektrografischen Druck- oder Kopiergerätes so auszugestalten, daß bei konstanter und zuverlässiger Reinigungswirkung eine Verlängerung der Wartungsintervalle erreicht wird.The present invention is therefore based on the object a release agent application device for applying Release agent on the surface of a fixing roller of an electrographic To design printing or copying machine so that with a constant and reliable cleaning effect Extension of the maintenance intervals is achieved.

Diese Aufgabe wird durch die im Patentanspruch 1 angegebenen Merkmale gelöst. Ausgestaltungen und Weiterbildungen der Erfindung sind in Unteransprüchen angegeben.This object is achieved by the specified in claim 1 Features resolved. Refinements and developments of the invention are specified in subclaims.

Das Antragselement ist auf einer Vorratsrolle aufgewickelt. An die Vorratsrolle ist ein Sensor gekoppelt, der die Rotationsgeschwindigkeit beispielsweise in Form von Impulsen erfaßt. Diese Impulse gibt er an eine Steuereinheit aus, die ihrerseits die Geschwindigkeit eines Motors, der die Aufnahmerolle antreibt, steuert. Der Steuereinheit sind somit die Rotationsgeschwindigkeiten beider Rollen bekannt. Darüber hinaus ist die Gesamtlänge des Antragselements bekannt. Aus diesen Größen errechnet die Steuereinheit die tatsächliche Geschwindigkeit des Antragselements und vergleicht diese mit einer Soll-Geschwindigkeit. Die Steuereinheit verlangsamt oder beschleunigt die Motor-Drehzahl entsprechend des Vergleichsergebnisses, so daß im Ergebnis eine konstante Transportgeschwindigkeit des Antragselements, die der Soll-Geschwindigkeit entspricht, erreicht wird.The application element is wound on a supply roll. A sensor is coupled to the supply roll, which measures the speed of rotation for example in the form of pulses. It outputs these impulses to a control unit which in turn the speed of an engine that is the take-up roll drives, controls. The control unit are therefore the Rotation speeds of both roles known. About that the total length of the application element is also known. Out The control unit calculates the actual values from these values Speed of the application element and compares it with a target speed. The control unit slows down or accelerates the engine speed according to the comparison result, so that the result is a constant transport speed of the application element, that of the target speed corresponds, is achieved.

Gemäß einer Weiterbildung und Ausgestaltung der Erfindung ermittelt die Steuereinheit auch das Ende des Antragselements. Bei bisherigen Lösungen war das Ende des Antragselements so ausgestaltet, daß es einen Abschalter betätigte, sobald es von der Vorratsrolle abgezogen wurde. Dabei kam es zu Ausfällen des zu betätigenden Schalters, so daß das Ende des Antragselements mit der Oberfläche der Fixierwalze in Kontakt kam. Diese konnte bei entsprechender Ausgestaltung des Endes, beispielsweise war dort eine Leiste angebracht, zur Zerstörung der Fixierwalze führen. Durch die erfindungsgemäße Lösung erkennt die Steuereinheit das Ende Antragselements aufgrund des Stillstandes oder der Verlangsamung der Vorratsrolle und schaltet daraufhin den Motor ab. Zusätzlich kann eine entsprechende Meldung an die Zentralsteuerung des elektrografischen Druck- oder Kopiergerätes ausgegeben werden.Determined according to a development and embodiment of the invention the control unit also the end of the application element. With previous solutions, the end of the application element was like this designed to operate a shutdown switch as soon as it was withdrawn from the supply roll. There were failures of the switch to be operated, so that the end of the application element in contact with the surface of the fuser roller came. With the appropriate design of the end, for example, a ledge was attached there for destruction the fuser roller. By the solution according to the invention the control unit recognizes the end of the application elements the standstill or the slowing down of the supply roll and then switches off the engine. In addition, a corresponding message to the central control of the electrographic Printing or copying device are output.

Gemäß einer weiteren Weiterbildung und Ausgestaltung der Erfindung dient als Antragselement ein Vlies mit einer Dicke zwischen 0,2 bis 0,3 mm. Dieses Vlies ist wesentlich dünner als herkömmliche Vliese. Vorzugsweise wird als Vliesmaterial Polyamid, Polyimid und Teflon oder Kombinationen daraus verwendet. Mittels des dünnen Vlieses kann eine größere Länge des Vlieses auf kleinem Raum aufgewickelt werden. Bei unveränderten Wartungsintervallen ist durch die erhöhte Vlieslänge eine erhöhte Vliesgeschwindigkeit realisierbar. Dadurch ist eine höhere Qualität der Reinigung der Fixierwalze gewährleistet, weil eine Verstopfung des Vlieses durch Schmutz verhindert werden kann. Das dünne Vlies ermöglicht eine schnelle und direkte Fixierwalzenbeölung. Ein besonderer Vorteil zeigt sich in der verbesserten Kapillarwirkung und Saugfähigkeit. Die Übertragung des Trennmittels zum Vlies mit Hilfe des Dochtes gewährleistet eine optimale Benetzung des Vlieses unabhängig von thermischen und geometrischen Toleranzen.According to a further development and embodiment of the invention serves as a request element a fleece with a thickness between 0.2 to 0.3 mm. This fleece is much thinner than conventional fleeces. Is preferably used as a nonwoven material Polyamide, polyimide and Teflon or combinations thereof are used. A longer length can be achieved by means of the thin fleece of the fleece can be wound up in a small space. With unchanged Maintenance intervals is due to the increased fleece length an increased fleece speed can be realized. This is ensures a higher quality of cleaning the fuser roller, because the fleece is not blocked by dirt can be. The thin fleece enables quick and direct fuser roller lubrication. A particular advantage shows improved capillary action and absorbency. The transfer of the release agent to the fleece using the Wicks ensure optimal wetting of the fleece independently of thermal and geometric tolerances.

Im folgenden wird ein Beispiel der Erfindung anhand der Zeichnung näher erläutert. Dabei zeigen

Figur 1
eine schematische Schnittdarstellung einer Trennmittelauftragsvorrichtung mit Fixierwalze und
Figur 3
eine schematische Darstellung eines Antragselements mit Vorratsrolle und Transportmitteln, und
Figur 2
eine Prinzipdarstellung einer Sensoreinheit zur Erfassung der Drehung der Vorratsrolle.
An example of the invention is explained in more detail below with reference to the drawing. Show
Figure 1
is a schematic sectional view of a release agent application device with fixing roller and
Figure 3
a schematic representation of an application element with supply roll and means of transport, and
Figure 2
a schematic diagram of a sensor unit for detecting the rotation of the supply roll.

In einem hier nicht im einzelnen dargestellten elektrografischen Druck- oder Kopiergerät ist in einer Thermofixierstation eine in Figur 1 dargestellte Trennmittelauftragsvorrichtung zum Auftragen von Trennmittel L auf die Oberfläche einer Fixierwalze F zugeordnet. Die Prinzipdarstellung zeigt die Fixierwalze F, die im Uhrzeigersinn umläuft. Nicht dargestellt sind die Andruckwalze der Fixierstation und der zwischen beiden Walzen geführte Aufzeichnungsträger. Dargestellt ist aber die Vorrichtung zum Auftragen von Trennmittel auf die Oberfläche der Fixierwalze F. Als Antragselement V dient ein Vlies, das eine Dicke von 0,2 bis 0,3 mm aufweist. Es besteht aus Polyamid, Polyimid oder Teflon. Das Antragselement V trägt Silikonöl oder ein anderes, geeignetes wärmebeständiges Trennmittel in flüssiger Form vorzugsweise auf die gesamte Oberfläche der Fixierwalze F auf. Um dies zu gewährleisten, erstreckt sich das Antragselement V mit seiner gesamten Breite über die gesamte axiale Länge der Fixierwalze F. Das Antragselement V ist darüber hinaus in einem vorbestimmten Umfangsbereich an die Fixierwalze F angelegt.In an electrographic not shown here in detail Printer or copier is in a heat setting station a release agent application device shown in Figure 1 for applying release agent L to the surface of a Fuser roller assigned. The basic diagram shows the Fuser roller F, which rotates clockwise. Not shown are the pressure roller of the fuser and the between recording media guided on both rollers. Shown but is the device for applying release agent the surface of the fusing roller F. serves as application element V. a fleece that has a thickness of 0.2 to 0.3 mm. It exists made of polyamide, polyimide or Teflon. The application element V carries silicone oil or another suitable heat resistant Release agent in liquid form preferably on the whole Surface of the fuser roller F on. To ensure this extends the application element V with its entire Width over the entire axial length of the fixing roller F. Das Application element V is also in a predetermined Circumferential area applied to the fixing roller F.

Im Betriebszustand steht das Antragselement V andauernd mit der Oberfläche der Fixierwalze F in Kontakt. Dabei nimmt das Antragselement V Schmutzteilchen, wie z.B. Tonerpartikel oder von dem Aufzeichnungsträger mitgeführten Staub auf. Um eine einwandfreie Funktion zu gewährleisten, wird, wie unten im Zusammenhang mit Figur 3 näher erläutert, vorzugsweise der an der Fixierwalze F anliegende Bereich des Antragselements V entweder kontinuierlich langsam, gegebenenfalls aber auch in zeitlichen Abständen abschnittsweise erneuert. Dazu ist eine Vorratsrolle VV, von der das Antragselement V abgezogen wird, sowie eine Aufnahmerolle AV vorgesehen, die das verbrauchte Antragselement V aufnimmt. Die Aufnahmerolle AV wird z.B. durch einen Motor MO angetrieben. Die vom Motor MO hervorgerufene Transportrichtung des Antragselements V läuft der Bewegung der Fixierwalze F entgegen, so daß das verbrauchte Antragselement V alle durch Abstreifen von der Oberfläche der Fixierwalze F aufgenommene Verunreinigungen mitführt und immer eine ausreichende Fläche relativ frischen Antragselements V zur Verfügung steht. In the operating state, application element V is always available the surface of the fixing roller F in contact. That takes Application element V dirt particles, such as Toner particles or dust carried by the recording medium. To one To ensure proper functioning, as described below in 3 explained in more detail, preferably the the area of the application element V lying against the fixing roller F. either continuously slow, but possibly also in intervals renewed in sections. There is one Supply roll VV, from which application element V is subtracted, as well as a take-up roll AV that consumed the Application element V includes. The take-up roll AV is e.g. driven by a motor MO. The one caused by the MO motor Transport direction of application element V runs the movement the fuser roller F so that the used application element V all by stripping from the surface of the Fuser roller F carries contaminations and always a sufficient area of relatively fresh application elements V is available.

Der Umfangsbereich, an dem das Antragselement V mit der Oberfläche der Fixierwalze F steht, wird durch den Abstand zweier sich parallel zueinander in axialer Richtung der Fixierwalze F erstreckender Führungselemente OB, UB definiert. Diese Führungselemente UB, OB sind vertikal übereinander angeordnet, so daß von einem oberen Führungselement OB und einem unteren Führungselement UB gesprochen werden kann. Die beiden Führungselemente OB, UB werden durch Federn S1, S2, die im Bereich der Stirnseiten der Führungselemente UB, OB angeordnet sind, zur Oberfläche der Fixierwalze F gedrückt.The peripheral area at which the application element V with the surface the fuser roller F stands by the distance between two parallel to each other in the axial direction of the fixing roller F extending guide elements OB, UB defined. These leadership elements UB, OB are arranged vertically one above the other, so that from an upper guide element OB and a lower one Guide element UB can be spoken. The two leadership elements OB, UB are represented by springs S1, S2, which are in the area the end faces of the guide elements UB, OB arranged are pressed to the surface of the fixing roller F.

Zusätzlich zu ihrer Führungsfunktion für das Antragselement V erfüllen die Führungselemente UB, OB eine weitere Aufgabe. Sie halten einen Docht D, dem von einem Trennmitteldosiervohr R Trennmittel L zugeführt wird. Der Docht D steht in Berührungskontakt mit dem Antragselement V, wodurch Trennmittel L vom Antragselement aufnehmbar ist. Dieses kann dann das Trennmittel L an die Fixierwalze F abgeben.In addition to her leadership role for application element V the guide elements UB, OB perform another task. You are holding a wick D, that of a release agent dosing tube R release agent L is supplied. The wick D is in touch contact with the application element V, whereby release agent L can be included in the application element. This can do that Dispense release agent L to the fixing roller F.

Gemäß Figur 3 wird das Antragselement V von einer Vorratsrolle VV im Uhrzeigersinn abgerollt, an der Fixierwalze F entlang geführt und von einer Aufnahme AV aufgewickelt. Die Aufnahmerolle AV wird von einem Motor MO entgegen dem Uhrzeigersinn angetrieben. Die Drehgeschwindigkeit der Vorratsrolle VV wird von einem Sensor H erfaßt. Die Drehzahl des Motors MO wird von einer Steuereinrichtung CON bestimmt. Diese Steuereinrichtung CON ist mit dem Sensor H gekoppelt und wertet die von dem Sensor gelieferten Informationen aus.According to Figure 3, the application element V from a supply role VV rolled in a clockwise direction along the fixing roller F. led and wound up from a recording AV. The recording role AV is counterclockwise by a motor MO driven. The speed of rotation of the supply roll VV is detected by a sensor H. The speed of the motor MO is determined by a control device CON. This control device CON is coupled to sensor H and evaluates the information provided by the sensor.

Beim Einsetzen einer neuen Vorratsrolle VV weist diese einen großen Außendurchmesser auf. Der Durchmesser der Aufnahmerolle AV ist entsprechend gering, da sich beispielsweise nur eine Lage des Antragselements V auf dem Aufnahmerohr AVR der Aufnahmerolle AV befindet. Eine konstante Motordrehzahl würde eine konstante Drehgeschwindigkeit des Aufnahmerohres AVR zur Folge haben. Mit zunehmendem Durchmesser der Aufnahmerolle AV käme es dann zu einer Steigerung der Transportgeschwindigkeit des Antragselements. In dem Maße, in dem der Durchmesser der Aufnahmerolle AV zunimmt, verringert sich der Durchmesser der Vorratsrolle VV. Deren Drehgeschwindigkeit steigt demnach beim Abwickeln des Antragselements V, wenn man eine konstante Geschwindigkeit des Antragselements V voraussetzt.When a new supply roll VV is inserted, it has one large outside diameter. The diameter of the take-up roll AV is correspondingly low, since there is only one, for example Location of application element V on the AVR receiving tube Recording roll AV is located. A constant engine speed would a constant speed of rotation of the receiving tube AVR Have consequence. With increasing diameter of the take-up roll AV the transport speed would then increase of the application element. To the extent that the diameter of the Recording roll AV increases, the diameter of the decreases Supply roll VV. Their rotational speed increases accordingly when processing the application element V, if you have a constant Speed of application element V presupposes.

Der Steuereinheit CON ist aufgrund der vom Sensor H vorliegenden Information die Rotationsgeschwindigkeit der Vorratsrolle VV bekannt. Die Rotationsgeschwindigkeit der Aufnahmerolle AV bestimmt die Steuereinheit CON selbst, weshalb auch diese Rotationsgeschwindigkeit bekannt ist. Die Steuereinheit vergleicht die Motordrehzahl mit der Drehzahl der Vorratsrolle VV und ermittelt daraus inwieweit das Antragselement V schon abgewickelt ist. Daraus errechnet sie den Durchmesser der Vorratsrolle VV. Aus dem Durchmesser der Vorratsrolle VV und deren Drehzahl ist die tatsächliche Geschwindigkeit des Antragselements V berechenbar. Diese tatsächliche Geschwindigkeit des Antragselements V wird mit einem Sollwert verglichen. Weicht der Ist-Wert vom Soll-Wert ab, paßt die Steuereinheit CON die Drehzahl des Motors MO entsprechend an. Handelt es sich beim Motor MO um einen Schrittmotor, wird entsprechend die Ein-/Ausschaltdauer dieses Schrittmotors MO verändert.The control unit CON is due to the presence of the sensor H. Information the rotation speed of the supply roll VV known. The speed of rotation of the take-up roll AV determines the control unit CON itself, why this rotational speed is also known. The control unit compares the engine speed with the speed of the Supply role VV and determines the extent to which the application element V has already been processed. From this she calculates the Diameter of the supply roll VV. From the diameter of the supply roll VV and its speed is the actual speed of application element V can be calculated. This actual Speed of application element V is with a Setpoint compared. The actual value deviates from the target value the control unit CON adjusts the speed of the motor MO accordingly. If the MO motor is one Stepper motor, the on / off duration of this is accordingly Stepper motor MO changed.

Zur Ermittlung der Drehgeschwindigkeit der Vorratsrolle VV wird ein Hallsensor H eingesetzt. Der Hallsensor H ist gemäß Figur 2 an der Stirnseite der Vorratsrolle W angeordnet. Auf einer kreisrunden Scheibe HS, die koaxial mit einem Stift HSS gekoppelt ist, sind in gleichmäßigen Abständen auf der von der Stirnseite der Vorratsrolle VV abgewandten Seite einzelne Magnete oder ein Magnetring angeordnet. Der Stift HSS dringt in die Achse VVA der Vorratsrolle VV koaxial ein und ist so mit dieser gekoppelt, daß der Stift HSS die Drehbewegung der Achse der Vorratsrolle VV auf die Scheibe HS überträgt. Den auf der Scheibe HS befindlichen Magneten HM ist ein Hallelement HL zugeordnet. Es befindet sich ortsfest in unmittelbarer Nähe zu dem sich um den Stift HSS drehenden Magneten HM.To determine the rotation speed of the supply roll VV a Hall sensor H is used. Hall sensor H is in accordance with Figure 2 arranged on the front side of the supply roll W. On a circular disc HS, coaxial with a pin HSS are evenly spaced on the from the face of the supply roll facing away from the individual Arranged magnets or a magnetic ring. The HSS pen penetrates into the axis VVA of the supply roll VV coaxially and so coupled with this that the pin HSS the rotational movement of the Axis of the supply roll VV transfers to the disc HS. The Magnet HM on the disc HS is a Hall element HL assigned. It is located in the immediate vicinity Proximity to the magnet HM rotating around the pin HSS.

Eine sichere Funktion des Hallsensors HL ist nur dann gewährleistet, wenn sowohl in radialer als auch in axialer Richtung sehr enge Toleranzen, beispielsweise +/- 0,2 Millimeter bezüglich des Abstandes zu den Magneten HM eingehalten werden. Diese engen Toleranzen werden dadurch eingehalten, daß der Stift HSS aus der Oberfläche der Scheibe HS eine definierte Länge herausragt. Dieser Teil des Stifftes HSS befindet sich auf der gleichen Seite wie die Magnete HM. Der Stift HSS weist in diesem Bereich eine axiale Bohrung HB auf, in die ein mit dem Hallsensor HL in Verbindung stehender Stift HLS einführbar ist. An diesem Stift HLS ist eine Aufnahmeplatte HP befestigt, die parallel zur Oberfläche der die Magnete HM tragenden Scheibe HS steht. Auf der den Magneten HM zugewandten Seite der Platte HP ist der Hallsensor HL angeordnet. Die Platte HP stützt sich auf einem ortsfesten Winkel HW ab, so daß eine Rotationsbewegung des mit der Scheibe HS gekoppelten Stiftes HSS nicht auf den mit der Platte HP gekoppelten Stift HLS übertragen wird und damit eine ortsfeste Position des Hallsensors HL in radialer Richtung erreicht wird.The safe function of the Hall sensor HL can only be guaranteed if both in the radial and in the axial direction very tight tolerances, for example +/- 0.2 millimeters with respect the distance to the magnets HM are observed. These narrow tolerances are met in that the HSS pin from the surface of the disc HS a defined Protrudes length. This part of the HSS is located on the same side as the magnets HM. The HSS pen has an axial bore HB in this area, in which a HLS pin connected to the Hall sensor HL can be introduced. There is a mounting plate on this HLS pin HP attached parallel to the surface of the magnets HM bearing disc HS stands. On the one facing the magnet HM The Hall sensor HL is arranged on the side of the plate HP. The Plate HP is based on a fixed angle HW, see above that a rotational movement of the coupled to the disc HS HSS pin not on the pin coupled to the HP plate HLS is transmitted and thus a fixed position of the Hall sensor HL is reached in the radial direction.

Zur Sicherstellung der ortsfesten Position des Hallsensors HL in axialer Richtung wird die Platte HP durch eine Feder HF axial auf die Stirnseite des mit der Scheibe HS gekoppelten Stiftes HSS gepreßt. Die Feder HF stützt sich dabei am ortsfesten Winkel HW ab. Bei einer entsprechend genauen Fertigung der Elemente des Sensors H können die erforderlichen engen Toleranzen eingehalten werden, ohne eine zusätzliche Einstellarbeit bei der Montage des Sensors H zu bedingen.To ensure the stationary position of the Hall sensor HL in the axial direction, the plate HP is HF by a spring axially on the end face of the coupled with the disc HS HSS pin pressed. The spring HF is based on the stationary Angle HW from. With a correspondingly precise production of the elements of the sensor H can be the necessary tight Tolerances are met without additional adjustment work conditions when installing the sensor H.

Der Aufbau des Sensors H kann auch in umgekehrter Weise erfolgen. Auf der Platte HP kann ein Magnet HM angeordnet werden. Entsprechend müßten auf der Scheibe HS anstelle der Magneten HM eine Mehrzahl von Hallsensoren HL angeordnet werden. Als weitere Alternative kann auf der Scheibe HS ein einzelner Magnet angeordnet werden und die Platte HP so groß ausgeführt werden, daß darauf eine Mehrzahl von Hallsensoren HL ortsfest anordenbar sind. Der rotierende Magnet würde dann auf seinem Weg die Mehrzahl von Hallsensoren HL beeinflussen.The sensor H can also be constructed in the reverse manner. A magnet HM can be arranged on the plate HP. Accordingly, HS would have to be on the disc instead of the magnets HM a plurality of Hall sensors HL are arranged. As a further alternative, a single one can be placed on the disc HS Magnet can be arranged and the plate HP as large be carried out that a plurality of Hall sensors HL can be arranged in a fixed position. The rotating magnet would then influence the majority of Hall sensors HL on its way.

Der Sensor H erfaßt somit jegliche Bewegung der Vorratsrolle VV. Abhängig von der Rotationsgeschwindigkeit werden in bestimmten Zeitabständen elektrische Impulse zur Steuereinheit CON übermittelt. Erhält die Steuereinheit CON in den ihr bekannten Zeitintervallen keine Impulse vom Sensor H, obwohl der Motor MO die Aufnahmerolle AV antreibt, erkennt die Steuereinheit CON das Ende des Antragselements V. Die Steuereinheit CON gibt eine entsprechende Meldung an die Steuerung des Druck- oder Kopiergerätes ab, so daß eine neue Rolle mit Antragselement V in das Gerät eingesetzt werden kann.The sensor H thus detects any movement of the supply roll VV. Depending on the speed of rotation are in certain Intervals of electrical impulses to the control unit CON submitted. Receives the control unit CON in the known Time intervals no pulses from sensor H, though the motor MO drives the take-up roller AV, recognizes the control unit CON the end of the application element V. The control unit CON issues a corresponding message to the controller of the Printing or copying machine, so that a new role with the application element V can be inserted into the device.

Claims (6)

  1. Device for applying release agent (L) to the surface of a fixing roller (F) of a printer or copier operating on the transfer-printing principle, having
    an applicator element (V) designed as a cleaning belt, which can be brought into contact with the fixing roller (F) and which applies the release agent (L) to the fixing roller (F),
    a supply roll (VV), on which the applicator element (V) is wound up and from which it can be unwound to a rewind roll (AV),
    a sensor (H) for registering the rotational speed of the supply roll (W) and
    a control unit (CON) which uses the rotational speed registered by the sensor (H) and the length of the applicator element (V) to derive the diameter of the supply roll (VV) and controls a motor (MO) that drives the rewind roll (AV) in such a way that a constant transport speed of the applicator element (V) is ensured, and which uses the data supplied by the sensor (H) about the speed of the supply roll (VV) to determine the end of the applicator element (V) on the supply roll (VV) and then switches the motor (MO) off.
  2. Device according to Claim 1, having a nonwoven which serves as the applicator element (V) and has a thickness of 0.2 mm to 0.3 mm.
  3. Device according to Claim 2, having a nonwoven consisting of polyamide, polyimide or teflon.
  4. Device according to one of Claims 1 to 3, having a control unit (CON) which determines the end of the applicator element (V) by comparing the data supplied by the sensor (H) with an intended range in which the data must lie.
  5. Device according to one of Claims 1 to 4, the sensor (H) containing:
    a disc (HS) which is coupled coaxially to the shaft (WA) of the supply roll (VV) and on which there are arranged magnets (HM) or Hall sensors (HL), which follow the rotational movement of the supply roll (VV); and
    a Hall sensor (HL) or magnet (HM) which is arranged in a fixed location with respect to the rotating magnets (HM) or Hall sensors (HL), in the range of influence of the latter, and which can be pressed in the axial direction against a spacer (HSS).
  6. Method of controlling the speed of an applicator element (V) for applying release agent (L) to the surface of a fixing roller (F) of a printer or copier operating on the transfer-printing principle,
    the applicator element (V), which can be brought into contact with a fixing roller (F) and is designed as a cleaning belt, being wound up on a supply roll (VV), from which it is unwound to a motor-driven rewind roll (AV),
    a sensor (H) registering the rotational speed of the supply roll (W), and
    a control unit (CON) using the rotational speed registered by the sensor (H) and the length of the applicator element (V) to derive the diameter of the supply roll (VV), controlling a motor (MO) that drives the rewind roll (AV) in such a way that a constant transport speed of the applicator element (V) is ensured, and using the data supplied by the sensor (H) about the speed of the supply roll (VV) to determine the end of the applicator element (V) on the supply roll (VV) and then switching the motor (MO) off.
EP96934383A 1996-01-26 1996-08-27 Device for applying release agent to the surface of a fixing roller of an electrographic printer or copier Expired - Lifetime EP0877973B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19602774 1996-01-26
DE19602774 1996-01-26
PCT/DE1996/001588 WO1997027518A1 (en) 1996-01-26 1996-08-27 Device for applying release agent to the surface of a fixing roller of an electrographic printer or copier

Publications (2)

Publication Number Publication Date
EP0877973A1 EP0877973A1 (en) 1998-11-18
EP0877973B1 true EP0877973B1 (en) 2001-07-18

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EP96934383A Expired - Lifetime EP0877973B1 (en) 1996-01-26 1996-08-27 Device for applying release agent to the surface of a fixing roller of an electrographic printer or copier

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US (1) US6070044A (en)
EP (1) EP0877973B1 (en)
JP (1) JP2000503419A (en)
DE (1) DE59607330D1 (en)
WO (1) WO1997027518A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6266496B1 (en) * 2000-04-13 2001-07-24 Lexmark International, Inc. Constant displacement oil web system and method of operating the same
US6347197B1 (en) * 2000-10-20 2002-02-12 Lexmark International, Inc. Life determination in an oil web system
US6445901B1 (en) * 2001-01-23 2002-09-03 Kenneth R. Rasch Fuser release agent management system with driven supply reel
US20050175379A1 (en) * 2004-02-09 2005-08-11 Berg Richard H. Web oiler speed control
JP5422920B2 (en) * 2008-05-23 2014-02-19 セイコーエプソン株式会社 Recording device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2104841B (en) * 1981-07-10 1985-10-16 Konishiroku Photo Ind Method of fixing toner image and apparatus therefor
US4569864A (en) * 1983-06-30 1986-02-11 Acumeter Laboratories, Inc. Roll coating applicator and adhesive coatings and the like and process of coating
JPS6146965A (en) * 1984-08-10 1986-03-07 Hitachi Koki Co Ltd Fixing device
JPS63276079A (en) * 1987-05-08 1988-11-14 Canon Inc Cleaning device for fixing surface of fixing device
JPH01214884A (en) * 1988-02-23 1989-08-29 Minolta Camera Co Ltd Copying machine and its fixing roll web
JPH058900A (en) * 1991-06-06 1993-01-19 Canon Inc Image forming device having sheet thickness detecting device
US5576821A (en) * 1995-12-18 1996-11-19 Xerox Corporation Fuser release agent management (RAM) system having a non-continuous pattern agent roll
US5836532A (en) * 1996-12-05 1998-11-17 E. I. Du Pont De Nemours And Company System and method for on-line missing/gained filament detection

Also Published As

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EP0877973A1 (en) 1998-11-18
DE59607330D1 (en) 2001-08-23
WO1997027518A1 (en) 1997-07-31
US6070044A (en) 2000-05-30
JP2000503419A (en) 2000-03-21

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