EP2176712A1 - Vorrichtung und verfahren zum beseitigen von tonerablagerungen auf der oberfläche eines reinigungselements - Google Patents
Vorrichtung und verfahren zum beseitigen von tonerablagerungen auf der oberfläche eines reinigungselementsInfo
- Publication number
- EP2176712A1 EP2176712A1 EP08786688A EP08786688A EP2176712A1 EP 2176712 A1 EP2176712 A1 EP 2176712A1 EP 08786688 A EP08786688 A EP 08786688A EP 08786688 A EP08786688 A EP 08786688A EP 2176712 A1 EP2176712 A1 EP 2176712A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- toner particles
- cleaning element
- particles
- cleaning
- carrier
- 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
Links
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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0844—Arrangements for purging used developer from the developing unit
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/095—Removing excess solid developer, e.g. fog preventing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/0064—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using the developing unit, e.g. cleanerless or multi-cycle apparatus
Definitions
- the invention relates to a method for removing toner deposits on the surface of a cleaning element which receives electrically charged toner particles from a support surface. Furthermore, the invention relates to a device for removing toner deposits on the surface of a cleaning element.
- Electrographic printers or copiers use image development techniques that color electrostatic charge images on subcarrier surfaces, such as charge images on a photoconductor or photoconductor belt, across an air gap or in direct contact with triboelectrically charged toner particles that transfer from the surface of an applicator element become.
- the surface of the applicator element After transferring the toner particles from the applicator element to the surface of the intermediate carrier, the surface of the applicator element must be cleaned of the remaining untransferred toner particles by a cleaning element, generally by a cleaning roller.
- the electrically charged toner particles picked up by the cleaning element which has a predetermined electrical potential, may solidify due to electrical forces of attraction, heat, friction or pressure and cause film formation or caking on the surface.
- the surface of the cleaning element can be impaired in its cleaning function and make the entire printing process unstable. If the solid deposits on the surface of the cleaning element detach as lumps or fragments, this can to impair the function of the developer station, z. B. insufficient coloring and even lead to their damage, eg. B. by scratching the surfaces.
- an apparatus for cleaning an electrode assembly which comprises a plurality of electrodes arranged around small passage holes.
- toner particles are passed through the passage holes, or the through holes are blocked, so that toner material can be applied imagewise to a carrier material present behind the electrode arrangement.
- Vagabonding toner particles may precipitate on the stationary electrode assembly and clog the through holes. Therefore, between the printing operations, a movably mounted cleaning device is moved toward the electrode arrangement, which removes and removes the toner particles without contact.
- the device comprises a suction nozzle whose opening is surrounded by an electrode which is subjected to voltage.
- the toner particles are detached from the electrode assembly and sucked through the suction nozzle. After the detachment of the toner particles, the device is removed again in order to be able to continue the printing process.
- Cleaning roller picks up electrically charged toner particles from the carrier surface of an applicator element.
- the toner particles are added to the mixture of toner particles and carrier recycled particles and used again.
- the electrically charged toner particles on the surface of the cleaning element are guided past an electrode arrangement which generates an alternating electric field.
- This alternating field acts on the electrically charged toner particles. Due to the alternating electric field with the electric charge of the toner particles, a motive force is generated in the alternating electric field, so that toner particles are moved back and forth. Free, non-adherent toner particles jump back and forth in the alternating field and can impinge on firmly adhering further toner particles on the surface of the cleaning element, which are thereby mechanically loosened and dissolved out. Thus, solidified toner particles on the surface of the cleaning element are loosened and their adhesive force on the surface is reduced. The relaxed ones Toner particles of the toner remaining on the cleaning element then form together with carrier particles to form a magnetic brush with which the carrier surface, for example a jump roller, is cleaned off.
- the toner particles After further movement of the cleaning element past the electrode arrangement, depending on the polarity of the alternating field and its charge, the toner particles are attracted or repelled from this surface in relation to the potential of the surface of the cleaning element. Abjected toner particles are immediately returned to the mixture of carrier particles and toner particles in the developer station. Surface-attracted toner particles loosely settle on the surface of the cleaning element. Upon further transport along the transport direction of the cleaning element, these loose toner particles are brought into the sphere of influence of carrier particles, whereby the toner particles are attracted to the carrier particles electrically.
- the working method works without contact and gently for the surface of the cleaning element, because a mechanical scraping or removal of the solid deposits is avoided. It also works gently and mechanically stress-free for the recycled toner particles, because the solid deposits are loosened up in the alternating field by other toner particles, so that a lump formation or a formation of fragments is largely avoided.
- apparatus for removing toner deposits on the surface of a cleaning element there is provided apparatus for removing toner deposits on the surface of a cleaning element.
- the technical advantages that can be achieved with this device are in line with this those which have been described in connection with the method.
- FIG. 1 shows a developer station with a cleaning roller, which comprises an electrode arrangement in an activation zone
- FIG. 2 shows a further example in which the cleaning roller in the same cleaning zone has the same direction of movement as an applicator roller
- FIG. 3 shows an electrode arrangement with a plurality of wire-shaped electrodes
- FIG. 4 shows a plate-shaped electrode arrangement
- FIG. 1 shows an exemplary embodiment of a development device 10 in which a mixture of electrically charged toner particles 12 and ferromagnetic carrier particles 14 is used.
- the toner particles 12 are shown as small balls and the carrier particles 14 as larger balls.
- a circulation device (not shown), the mixture is applied in the direction of the arrow Pl to a inking roller 16.
- stationary elongate magnetic elements 18 are arranged, whose outwardly directed poles are seen in the circumferential direction alternate the variant shown.
- the carrier particles 14 are arranged and aligned on each magnetic element 18 by the force of the magnetic field along the magnetic field lines, wherein on the surface of the inking roller 16 in the region of the outwardly facing poles of the magnetic elements 18, an accumulation of carrier particles 14 protruding from the surface and the at them adhering toner particles 12 is formed.
- a protruding aggregation of carrier particles 14 and toner particles 12 is called a magnetic brush due to the brush-like shape.
- the toner particles 12 are triboelectrically charged by the tumbling operation and generally have a negative electric charge. They adhere to the carrier particles 14 and are transported on the basis of the rotating sleeve of the inking roller 16 with this in the direction of the arrow P2 on.
- a metering blade 20 produces a uniformly high layer of the mixture on the outer surface of the inking roller 16.
- This uniform layer is brought by rotation of the inking roller 16 in a Einärbezone 22, where due to a potential difference between the inking roller 16 and Ü transfer roller 24 under the effect of the electric field, the toner particles 12 are transferred to the surface of the transfer roller 24.
- the toner particles 12 are there on the surface in a uniform homogeneous layer 25 on.
- the transfer roller 24 is brought in rotation in the direction of the arrow P3 in a transfer zone 28, in which the uniform toner layer 25 on an intermediate carrier 30, for example in the electrography a photoconductor in the form of an endless photoconductor belt, is passed.
- toner particles 12 are on an air gap under the action of the electric field on the Transposed intermediate carrier 30 according to the image-shaped distribution.
- This process, in which the toner particles 12 jump over from the transfer roller 24 to the intermediate carrier 30, is also referred to as a jump process.
- the transfer roller 24 is therefore also referred to as a jump roller.
- Residual toner 32 is removed in a cleaning zone 34 by means of a cleaning roller 36.
- magnetic elements 38 are arranged which have the same function as in the inking roller 16 and form a magnetic brush with the aid of the magnetic carrier particles 14.
- the carrier particles 14 are transported from the inking zone 22 to the cleaning zone 34, as shown in FIG.
- These carrier particles 14 receive the toner particles 12 from the surface of the transfer roller 24.
- the carrier particles 14 are transported along with the toner particles 12 on.
- the toner particles 12 adhere to the carrier particles 14.
- This mixture separates from the surface of the cleaning roller 36 when it leaves the magnetic field of the magnetic elements 38, and falls back in the direction of arrow P5 in a developer chamber and is mixed again together with there toner particles and carrier particles. Due to their electrical charge and the action of the surface forces, a plurality of toner particles 12 remain on the surface of the cleaning roller 36, which is subjected to a DC potential, and are transported into an activation zone 40. These toner particles 12 may form a solid build-up or deposit 42 due to electrical adhesive forces, heat, pressure and / or aging, which adheres relatively firmly to the surface of the cleaning roller 36. On the surface of the cleaning roller 36 so toner films or caking can form, which can become more voluminous in the course and several revolutions of the cleaning roller 36.
- an electrode arrangement 44 is positioned, which is acted upon by an alternating voltage.
- This alternating voltage is preferably superimposed on a DC voltage.
- the alternating voltage is in the range of 200 to 3000 Vss (peak to peak measured), in particular in the range of 1500 to 2500 Vss, at a frequency of 1 to 10 kHz, in particular in the range of 2 to 5 kHz.
- the DC voltage can be in the range of 0 to 2000 V, in particular in the range of 200 V to 900 V.
- the distance a between the surface of the cleaning roller 36 and the electrode assembly 44 is in the range of 0.05 to 2 mm, in particular in the range of 0.1 to 0.5 mm.
- the cleaning roller 36 is supplied with a DC voltage ranging from 0 V to 2000 V, in particular 200V to 900V.
- the transfer roller is supplied with a DC voltage which is in the range of - 1000 V to + 500 V, in particular in the range of - 500 V to 0 V.
- the inking roller 16 has a DC potential in the range of - 3000 V, to + 1000 V, in particular - 2000 V to 0 V.
- the DC voltages are selected so that the toner particles 12 under the effect of the resulting electric field of force of the Einfärbewalze 16 to the transfer roller 22, from there to the intermediate carrier 30 and the cleaning roller 36 are transmitted securely.
- the electrode assembly 44 generates an electric field which acts in its near field 46 on the opposite toner particles 12. Due to the changing electric field forces, the electrically charged toner particles 12 are released from the surface of the cleaning roller 36 and moved back again. In the near field 46 of the electrode arrangement 44, ie in the region between the electrode arrangement 44 and its directly opposite surface of the cleaning roller 36 (which forms the counterelectrode), the toner particles 12 jump back and forth between the electrode arrangement 44 and the surface of the cleaning roller 36 avalanche-like further toner particles 12 detached. As a result, firmly attached toner particles 12 are loosened in the activation zone 40. Upon further rotation of the cleaning roller 36 in the direction P4, the loosened toner particles 12 leave the near zone 46 of the alternating electric field.
- the charge of the respective loosened toner particle 12 and the potential of the surface of the cleaning roller 36 some toner particles 12 are not moved back to the surface of the cleaning roller 36, but fall in the direction P5 due to gravity down and mix with the mixture of carrier particles 14 and toner particles 12. The remaining on the surface of the cleaning roller 36 toner particles 12 are loosened and are transported on.
- the cleaning roller 36 as mentioned above, carrier 14 supplied via the inking roller 16. These carrier particles 14 attract the toner particles 12 and further convey them in the area of the magnets 38. In this way, the loosely adhered toner particles 12 are returned to the mixture of carrier particles 14 and toner particles 12.
- the carrier particles 14 are transported in opposite directions to the surface speed of the transfer roller 24.
- the magnetic brush forming in the region of the magnets 38 carries the residual toner 32 in the direction P4 of the cleaning roller 36.
- Figure 2 shows a further embodiment in which the cleaning roller 36 performs a rotational movement according to the arrow P6, in which in the cleaning zone 34, the surface of the transfer roller 24 and the cleaning roller 36 move in the same direction.
- the cleaning roller 36 itself does not contain stationary magnetic elements.
- the transfer of the toner particles 12 from the transfer roller 24 to the cleaning roller 36 in the cleaning zone is carried out by a jump process, wherein the required DC voltage potentials for the electric field force are set accordingly.
- the inking roller 16 further includes the stationary magnetic elements 18, wherein a magnetic element 18 is also arranged in the region of a zone 50, so that a magnetic brush is formed in this area. Accordingly, the mixture of toner particles 12 and magnetic carrier particles 14 also in the region of the zone 50 in the form of a Magnetic brush transported.
- the electrode arrangement 44 is provided in an activation zone 52, which, as in the exemplary embodiment according to FIG. 1, loosens up solid toner deposits on the surface of the cleaning roller 36. In the region of the zone 50 are then on the surface of the cleaning roller 36, the loosened toner particles, which are received by the carrier particles 14 with.
- the carrier particles 14 and the toner particles 12 adhered thereto leave the inking roller 16 in a region where no magnetic field of the magnetic elements 18 is more effective, in the direction of the arrow P7, the surface of the inking roller 16 and are mixed in the developer chamber with the toner mixture.
- FIG. 3 shows an electrode arrangement 44 in which a
- Electrode wires 56 is arranged perpendicular to the paper plane, so that the alternating electric field between the electrode wires 56 and the surface 58 is formed. By this arrangement, the space of the near field 46, in which the alternating electric field is particularly effective, is increased.
- the surface 58 which carries the toner particles 12 and the attachment 42, is flat in this example, for example, formed by a cleaning tape.
- Figure 4 shows a plate-shaped electrode assembly 60, which also faces a flat surface 58.
- the electrode assembly 44 may be provided with a surface having an electrical resistance. This can preferably be done with the aid of a hardcoat layer or with the help of a ceramic layer, for. B. Al 2 O 3 , Cr 2 O 3 , take place.
- the alternating voltage can also be a square-wave voltage with a variable duty cycle.
- the movement of the toner particles 12 between the electrode assembly 44 and the surface of the cleaning roller 36 can be influenced.
- the residence time of the toner particles 12 on the side of the electrode assembly 44 or on the side of the cleaning roller 36 can be adjusted specifically.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Cleaning In Electrography (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007035994A DE102007035994A1 (de) | 2007-08-01 | 2007-08-01 | Vorrichtung und Verfahren zum Beseitigen von Tonerablagerungen auf der Oberfläche eines Reinigungselements |
| PCT/EP2008/060063 WO2009016233A1 (de) | 2007-08-01 | 2008-07-31 | Vorrichtung und verfahren zum beseitigen von tonerablagerungen auf der oberfläche eines reinigungselements |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2176712A1 true EP2176712A1 (de) | 2010-04-21 |
| EP2176712B1 EP2176712B1 (de) | 2012-08-29 |
Family
ID=40010807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08786688A Not-in-force EP2176712B1 (de) | 2007-08-01 | 2008-07-31 | Vorrichtung und verfahren zum beseitigen von tonerablagerungen auf der oberfläche eines reinigungselements |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8406651B2 (de) |
| EP (1) | EP2176712B1 (de) |
| DE (1) | DE102007035994A1 (de) |
| WO (1) | WO2009016233A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009037735A1 (de) * | 2009-08-17 | 2011-02-24 | OCé PRINTING SYSTEMS GMBH | Reinigungseinrichtung für eine Entwicklerwalze bei einem elektrografischen Druck- oder Kopiergerät |
| DE102010036840A1 (de) * | 2010-08-04 | 2012-02-09 | OCé PRINTING SYSTEMS GMBH | Entwicklerstation für elektrografische Druck- oder Kopiereinrichtungen |
| NL2008319C2 (en) * | 2012-02-20 | 2013-08-21 | Emb Technology B V | Powder purging apparatus and method. |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3422948C2 (de) * | 1983-06-20 | 1986-08-14 | Ricoh Co., Ltd., Tokio/Tokyo | Verfahren und Vorrichtung zum Sammeln von nicht-übertragenem Trockenentwickler in einem elektrophotographischen Kopiergerät |
| US5311258A (en) * | 1993-08-23 | 1994-05-10 | Xerox Corporation | On-the-fly electrostatic cleaning of scavengeless development electrode wires with D.C. bias |
| EP1019786B1 (de) | 1997-09-30 | 2002-08-07 | Ricoh Company | Bilderzeugungsverfahren und gerät und reinigungsvorrichtung hierfür |
| JP3780136B2 (ja) * | 2000-01-06 | 2006-05-31 | キヤノン株式会社 | 画像形成装置 |
| DE10152892A1 (de) * | 2001-10-26 | 2003-05-08 | Oce Printing Systems Gmbh | Verfahren und Vorrichtung zur Reinigung von Trägerelementen in Druckern oder Kopierern unter Anwendung von Magnetfeldern |
| DE102004059532A1 (de) * | 2004-12-09 | 2006-06-14 | OCé PRINTING SYSTEMS GMBH | Elektrografische Druck- oder Kopiervorrichtung sowie Verfahren zum Betreiben der Druck- oder Kopiervorrichtung |
| DE102007019311A1 (de) | 2007-04-24 | 2008-11-06 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum Reinigen einer mit Tonerteilchen versehenen Trägeroberfläche |
-
2007
- 2007-08-01 DE DE102007035994A patent/DE102007035994A1/de not_active Withdrawn
-
2008
- 2008-07-31 WO PCT/EP2008/060063 patent/WO2009016233A1/de not_active Ceased
- 2008-07-31 EP EP08786688A patent/EP2176712B1/de not_active Not-in-force
- 2008-07-31 US US12/670,808 patent/US8406651B2/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009016233A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US8406651B2 (en) | 2013-03-26 |
| DE102007035994A1 (de) | 2009-02-05 |
| US20100226703A1 (en) | 2010-09-09 |
| WO2009016233A1 (de) | 2009-02-05 |
| EP2176712B1 (de) | 2012-08-29 |
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