EP1241533A2 - Dispositif de rouleau de transfert améliorée - Google Patents

Dispositif de rouleau de transfert améliorée Download PDF

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Publication number
EP1241533A2
EP1241533A2 EP02005571A EP02005571A EP1241533A2 EP 1241533 A2 EP1241533 A2 EP 1241533A2 EP 02005571 A EP02005571 A EP 02005571A EP 02005571 A EP02005571 A EP 02005571A EP 1241533 A2 EP1241533 A2 EP 1241533A2
Authority
EP
European Patent Office
Prior art keywords
transfer roller
cleaning brush
roller
engagement
cleaning
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.)
Withdrawn
Application number
EP02005571A
Other languages
German (de)
English (en)
Other versions
EP1241533A3 (fr
Inventor
Gary B. Bertram
Philip A. Stern
George R. Walgrove Iii
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.)
Eastman Kodak Co
Original Assignee
Heidelberger Druckmaschinen AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP1241533A2 publication Critical patent/EP1241533A2/fr
Publication of EP1241533A3 publication Critical patent/EP1241533A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • G03G21/0035—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 a brush; Details of cleaning brushes, e.g. fibre density

Definitions

  • the present invention relates to a method for cleaning transfer rollers in high speed printers and a related device.
  • CMOS printers and copiers e.g. from Heidelberg Digital are made using a transfer roller to which a bias is applied is to transfer toner or developing material from a developed image to a photoconductor or transfer from an equivalent film to a substrate.
  • the Transfer roller is electrostatically biased to remove charged toner particles from the Surface of the photoconductor or an equivalent film towards a receiving sheet transferred, for example on paper.
  • a rotating acrylic fiber brush is removed the residual toner from the surface of the transfer roller.
  • the one on the brush Toner is passed a vacuum cleaning station, which removes and injects the toner deposited in a disposal container.
  • High speed printers and copiers are capable of more than 100 per minute Make copies. You can make thousands of copies in one day.
  • the Waste toner particles can accumulate on the transfer roller and cause undesirable marks on the copies. Such are often undesirable Marks only recognized after a large print job has been completed. Such undesirable markings are unacceptable, with the result that numerous large print and copy jobs have to be made again.
  • the unwanted markings cause unnecessary paper consumption, which for the User expensive, uneconomical and disadvantageous for the wood and paper resources is.
  • the transfer roller may need to be cleaned manually. That causes Productivity losses for the copier / printer as well as unwanted additional Maintenance costs for the user of the copier / printer.
  • the invention provides an improvement in the transfer roller cleaning process Copiers and printers. She sees constructive criteria for the choice of the intervention between the transfer roller and the cleaning brush. One of the criteria the choice of an engagement distance for compressing the transfer roller and the cleaning brush without slipping or blocking the Transfer roller with subsequent smearing of the receiver sheet by toner comes. The criteria also include choosing a fiber density for the Cleaning brush from a range of densities according to the force of engagement between the Rollers. Using the present invention, the cleaning performance of Copiers and printers improved. The result is less unusable print jobs and less downtime to clean the transfer rollers.
  • a preferred embodiment comprises a method for setting a Transfer roller cleaning station for efficient and better cleaning of the Transfer roller.
  • the transfer roller is rubbed by a continuous photoconductor belt or driven by an equivalent film or drum.
  • This Film guides a developed image past the transfer roller where the image is on one Substrate is transferred.
  • a cleaning station removes residual toner particles from the Transfer roller.
  • the cleaning station includes a cleaning brush with a Large number of fibrous bristles that extend from the cleaning brush to the transfer roller extend. The bristle force acting against the transfer surface can be measured Adjust the adjustment of the cleaning brush towards the transfer roller. As soon as the desired intervention is selected, the cleaning brush is locked in its position and maintains a relatively constant engagement with the transfer roller.
  • the Cleaning brush is driven in one direction by its own motor runs opposite to the direction of the transfer roller.
  • the determination of the blocking torque that brakes the rotation of the transfer roller or stops, is achieved by known means.
  • the cleaning brush can be moved in such a way that their bristles engage the transfer roller with an initial force that is sufficient to bend the brushes against the transfer roller and at least with the partial removal of residual development material from the transfer roller too kick off.
  • the cleaning brush is moving in small incremental steps Transfer roller with which moved to closer engagement with the transfer roller. With each step, the cleaning condition of the transfer roller is recorded.
  • the Cleaning effect improves little or not at all until a first intervention threshold is exceeded. Then the cleaning effect increases continuously until that Blocking torque is reached. Otherwise, the cleaning performance improves in the Dimensions in which the density of the fibrous bristles on the cleaning brush increases.
  • the Cleaning performance below the blocking torque is achieved by increasing the engaging force and improved by increasing the density of the bristles in the cleaning brush.
  • Fig. 1 shows in schematic form a typical printing device 10 of the electrophotographic design, which is used to use an exemplary Transfer roller assembly is suitable, as shown in US-A-6,097,913 and described.
  • the film element 12 is, for example, as elongated, endless belt formed, which is arranged on carrier rollers and around a closed path through a series of electrographic processing stations in Direction of arrow A is movable.
  • the moving film element 12 evenly charged as it passes a charging station 14. Subsequently the uniformly charged dielectric element passes through an exposure station 16, in which changes the uniform charge such that a latent image charge pattern arises that corresponds to the information to be printed.
  • the latent image charge pattern are formed in that the dielectric element with a reflected image of an original to be reproduced is exposed, or by a "Write operation" is performed on the dielectric element with a series of lamps (e.g. LEDs or lasers) or with point electrodes generated by electronically Signals can be activated, based on the desired to be reproduced Information.
  • the latent image charge pattern on film element 12 is then shown in FIG Effectively brought to a development station 18, the pigmented Marking particles for adhesion to the dielectric elements, and so that Latent image developed.
  • the part of the dielectric element that carries the developed image then passes through a transfer station 20 in registration with one Printing material 8, which from a storage compartment 22 is in a relationship that is precisely timed is fed along the path P.
  • An electrical one generated in the transmission station Field pulls the marker particles of the developed image from the dielectric Element for printing material.
  • the electrical transmission field can adhere the substrate 8 to the effect dielectric element. It is therefore immediately below in the direction of transport dielectric element, a detachment mechanism 24 is arranged to detach the Allow substrate from the dielectric element.
  • the release mechanism can, for example, an AC corona charger to neutralize the Field of attraction that holds the substrate 8 to the dielectric element.
  • the aforementioned transmission station 20 can be, for example Transfer roller assembly, the following with particular reference to FIG. 2nd is described in detail.
  • Other transfer roller assemblies are of course, also suitable for use with the present invention.
  • the Transfer roller assembly includes a housing 40, a transfer roller 42, one Roller cleaning mechanism 44 and a detaching mechanism 24 in a more compact manner Configuration.
  • a voltage-limited current source (not shown) is connected to the An electrical bias is applied to the core of the transfer roller 42. If the Transfer roller operatively related to dielectric element 12 (as in FIG. 2 shown), an electrical transmission field is built up, which is a developed Efficiently transfers image from the dielectric element to a substrate 8 which between them.
  • the Roller cleaning mechanism 44 of transfer station 20 includes an elongated, cylindrical fiber brush 52.
  • the cleaning brush 52 is such in the housing 40 held that the longitudinal axis of the cleaning brush parallel to the longitudinal axis of the Transfer roller 42 runs. The respective longitudinal axes are in relation to one another spaced that part of the surrounding area of the cleaning brush 52 the Transfer roller 42 touches.
  • a motor 56 attached to the housing 40 is included connected to the cleaning brush 52 and rotates the cleaning brush at high speed and preferably in one direction such that the cleaning brush and the Rotate the transfer roller in the contact area counter to the marking particles (and any accumulated paper dust) effectively wiped off the transfer roller, so that they can be absorbed by the fibers of the cleaning brush.
  • the Roller cleaning mechanism 44 equipped with a suction system 62.
  • the Suction system 62 which with a (not shown) vacuum blower in Flow connection is established, forms a around the cleaning brush 52 Air flow chamber.
  • the air flow chamber forms an air duct that is part of the cleaning brush 52 and an opening 64 facing the cleaning brush has, which is adjacent to the peripheral surface of the cleaning brush below the Contact area between the cleaning brush and transfer roller is arranged and extends in the direction of the longitudinal axis of the cleaning brush.
  • a lip 68 extends into the fibers of the cleaning brush.
  • the lip 68 serves as a flicker bar to bend the brush fibers and let go so that the particulate material on it can be thrown off. This released particle material is taken up by the air flow and by the Cleaning mechanism to a remote collection point (not shown) transported.
  • the distance between the axes of rotation of the transfer roller 42 and the Cleaning brush 52 is normally fixed. Those described in this document Techniques enable a person skilled in the art to determine the appropriate distance between to determine the centers of the cleaning brush and the roller and the To design a transfer station for a chosen cleaning brush. Alternatively, is the distance between the centers can be adjusted by a suitable mechanism.
  • the axis of the cleaning brush could, for example, be arranged in bearings that are in Longitudinal slots can be positioned, which are arranged adjacent to the bearings. If the bearings are set to the desired positions, they can be adjusted by suitable ones Lock the agent in this position. Using a pawl mechanism for the individual adjustment slots, the bearings could be moved in individual steps and to adjust.
  • the transfer roller is opposed by the transfer roller adjustment seat held the film.
  • the cleaning brush has its own (not shown) Axial adjuster provided to the distance between the axis of the transfer roller 42nd and the cleaning brush 52. Once the rollers are in relation to each other are positioned, their engagement ratio is fixed and the engagement force remains relatively constant during machine operation.
  • the transfer roller assembly release mechanism 24 is preferably an AC corona charger connected to the housing 40 is.
  • the release mechanism 24 is arranged such that the loader is below the Transfer roller 42 is when transfer station 20 is in operative relationship with the dielectric element so that it builds up a field that the electrostatic attractive forces between the substrate and the dielectric Element eliminated. In this way, the substrate can be easily removed from the detach dielectric element and the fixing device 26 (Fig. 1) on the Feed the intended transport route P without disturbances or transport jams arise.
  • the cleaning brush 52 with a force F against the Transfer roller 42 pressed, which is sufficient to the fiber bristles 500 Bring cleaning brush 52 into contact with the transfer roller 42.
  • the force F depends on the engagement distance between the cleaning brush and the transfer roller.
  • the transfer roller 42 is freely rotatable and is directed from the film element 12 of arrow A driven.
  • the cleaning brush 52 is driven by the motor 56 in driven in the opposite direction (arrow B).
  • Fig. 3a shows parts of the Transfer roller 42 and the cleaning brush 52 before the engagement, while Fig. 3c the corresponding parts after the procedure.
  • the fiber bristles 500 are from the Engagement force F bent against the transfer roller 42. This power is superior to that Fiber bristles 500 apply frictional resistance to the transfer roller 42.
  • the fibers of the cleaning brush consist of an acrylic material, however, other materials can be used in place of acrylic materials without being on Polyamide, polypropylene or natural animal or vegetable fibers are limited too his.
  • the frictional resistance acts in the opposite direction to the drive torque, that bears against the film element 12. If the applied engaging force F is too large, it slips the transfer roller with respect to the film element 12 by or blocked.
  • cleaning performance improves significantly when the procedure between the transfer roller and the cleaning brush larger than one
  • the minimum threshold is as long as the intervention does not slip or block the Transfer roller causes.
  • the engagement is the distance between the transfer roller and the cleaning brush that exceeds a position in which the bristles of the Just touch the cleaning brush to the outer surface of the transfer roller.
  • the cleaning can be improved by changing the density of the fiber bristles 500 in the cleaning brush 52 increased. So there are areas in terms of engagement and fiber density that Improve overall cleaning performance without exceeding a resistance equal to or greater than the blocking torque of the transfer roller 42.
  • the present invention relates to improving the cleaning performance of a transfer roller subsystem using a rotating acrylic fiber brush. It is known from the prior art that the cleaning effect of a brush system can be improved by increasing the fiber density and the brush engagement with the surface to be cleaned.
  • the fiber density is 4.58 x 10 -2 g / cm 2 (13.5 oz-yd 2 ) and the engagement is +0.889 mm (0.035 ").
  • the engagement is measured as the distance the fibers in the surface to be cleaned is "pressed”. With an intervention of 0 mm (0 ”) the tips of the fibers just touch the surface to be cleaned.
  • the cleaning effect can only be improved up to a critical intervention value. In a sample construction, the critical intervention is approximately 1.27 to 1.52 mm (0.050-0.060 ”).
  • the contour curve (FIG. 4a) illustrates this.
  • the diagram shows the lines E0 - E7 of a constant cleaning performance.
  • the numbers are part of a relative scale, with increasing values indicating an improvement in cleaning performance (in dB).
  • Each line represents approximately a 12% change in cleaning performance.
  • the torque required to rotate the roller increases, as shown in the diagram in FIG. 4b.
  • the roller to be cleaned by the cleaning brush is rotated by frictional forces between the roller and the film against which the roller runs.
  • the cleaning brush runs counter to this direction of rotation. If the torque becomes too large, the roller may jam. This causes problems in paper transport and in image quality.
  • the maximum permissible torque (T2) thus limits the range of possible combinations of brush engagement and cleaning brush density.
  • the cleaning brush is therefore subject to the following design requirements: Brush engagement> engagement critical Torque ⁇ torque maximum
  • intervention critical > 1.346 mm (53 mil) torque maximum ⁇ 0.042 Nm (6 in * oz)
  • the test results show that there is a lower, minimal intervention, above which the cleaning performance improves.
  • the low, minimal intervention is due to a relatively constant cleaning performance over a large area of engagement certainly.
  • a certain intervention threshold is approximately 1.346 mm (53 mil).
  • the cleaning performance is relatively constant below this threshold. Above this threshold, performance continues to improve until the Transfer roller slips or blocks, see Fig. 4b.
  • Cleaning brushes with increased density have an increased cleaning performance up to the blocking torque limit.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Cleaning In Electrography (AREA)
EP02005571A 2001-03-14 2002-03-12 Dispositif de rouleau de transfert améliorée Withdrawn EP1241533A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US808491 2001-03-14
US09/808,491 US6381427B1 (en) 2001-03-14 2001-03-14 Transfer roller cleaning

Publications (2)

Publication Number Publication Date
EP1241533A2 true EP1241533A2 (fr) 2002-09-18
EP1241533A3 EP1241533A3 (fr) 2005-11-02

Family

ID=25198922

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02005571A Withdrawn EP1241533A3 (fr) 2001-03-14 2002-03-12 Dispositif de rouleau de transfert améliorée

Country Status (5)

Country Link
US (1) US6381427B1 (fr)
EP (1) EP1241533A3 (fr)
JP (1) JP2002287536A (fr)
CA (1) CA2376897A1 (fr)
DE (1) DE10210806A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108636845A (zh) * 2018-05-04 2018-10-12 叶财明 一种单面印刷纸残留碳粉清洁设备

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002304097A (ja) * 2001-04-04 2002-10-18 Fuji Xerox Co Ltd クリーニング装置及びこれを用いた画像形成装置
DE10346659B3 (de) * 2003-09-10 2004-11-18 Janko Despot Reinigungseinrichtung für eine zylindrische Fläche in einer Druckmaschine
US7167662B2 (en) * 2004-03-25 2007-01-23 Eastman Kodak Company Conductive brush cleaner for a transfer roller
US7245848B2 (en) * 2004-03-26 2007-07-17 Eastman Kodak Company Method and apparatus for discharging a conductive brush cleaning assembly for a transfer roller
US7428395B2 (en) * 2005-03-21 2008-09-23 Kabushiki Kaisha Toshiba Image forming apparatus equipped with developing unit to make developing and simultaneous cleaning and image forming method
US7493060B2 (en) * 2005-09-16 2009-02-17 Xerox Corporation Cleaning system for removing dendrites from a charging device in a xerographic printer
JP2014006383A (ja) * 2012-06-25 2014-01-16 Konica Minolta Inc 画像形成装置
TR201808338T4 (en) * 2015-08-12 2018-07-23 Efficient Anilox Care Llc MICROFIBER ANILOX ROLL CLEANING PLATE.
DE102016119055A1 (de) 2016-10-07 2018-04-12 Ideego Gmbh Reinigungsvorrichtung für eine Oberfläche eines Zylinders einer Druck- und/oder Kopiermaschine
CN108067448A (zh) * 2017-12-27 2018-05-25 重庆辰罡科技有限公司 一种用于清理烧结垫板的刷除装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847312A1 (de) * 1978-04-06 1979-10-25 Irodagepipari Es Finomechanika Reinigungswalze an kopiermaschinen
JPS57116377A (en) * 1981-01-12 1982-07-20 Fuji Xerox Co Ltd Cleaing method for surface of xerography photoreceptor
US5532795A (en) * 1993-12-28 1996-07-02 Ricoh Company, Ltd. Method of and system for cleaning roller members
US5612775A (en) * 1994-03-08 1997-03-18 Canon Kabushiki Kaisha Displace cleaning apparatus with toner scattering feature and electrophtographic image forming apparatus using same
US5797078A (en) * 1993-07-09 1998-08-18 Xerox Corporation Photoreceptor comet prevention brush

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3847119A (en) * 1972-03-27 1974-11-12 Xerox Corp Transfer roller assembly
NL179517C (nl) * 1974-11-18 1986-09-16 Oce Van Der Grinten N V P A Oc Inrichting voor het elektrostatisch overdragen van een poederbeeld vanaf een drager naar een ontvangstmateriaal.
JPS54137352A (en) * 1978-04-18 1979-10-25 Olympus Optical Co Ltd Cleaning mechanism for xerographic apparatus
US5101238A (en) * 1991-01-18 1992-03-31 Eastman Kodak Company Roller transfer assembly
US6175711B1 (en) * 1998-10-16 2001-01-16 Fuji Xerox Co., Ltd. Image forming apparatus having a toner diffuser

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847312A1 (de) * 1978-04-06 1979-10-25 Irodagepipari Es Finomechanika Reinigungswalze an kopiermaschinen
JPS57116377A (en) * 1981-01-12 1982-07-20 Fuji Xerox Co Ltd Cleaing method for surface of xerography photoreceptor
US5797078A (en) * 1993-07-09 1998-08-18 Xerox Corporation Photoreceptor comet prevention brush
US5532795A (en) * 1993-12-28 1996-07-02 Ricoh Company, Ltd. Method of and system for cleaning roller members
US5612775A (en) * 1994-03-08 1997-03-18 Canon Kabushiki Kaisha Displace cleaning apparatus with toner scattering feature and electrophtographic image forming apparatus using same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN Bd. 006, Nr. 209 (P-150), 21. Oktober 1982 (1982-10-21) -& JP 57 116377 A (FUJI XEROX KK), 20. Juli 1982 (1982-07-20) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108636845A (zh) * 2018-05-04 2018-10-12 叶财明 一种单面印刷纸残留碳粉清洁设备

Also Published As

Publication number Publication date
EP1241533A3 (fr) 2005-11-02
JP2002287536A (ja) 2002-10-03
CA2376897A1 (fr) 2002-09-14
US6381427B1 (en) 2002-04-30
DE10210806A1 (de) 2002-09-26

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