WO2005111735A2 - Verfahren und anordnung zum einfärben eines applikatorelements eines elektrofotografischen druckers oder kopierers - Google Patents
Verfahren und anordnung zum einfärben eines applikatorelements eines elektrofotografischen druckers oder kopierers Download PDFInfo
- Publication number
- WO2005111735A2 WO2005111735A2 PCT/EP2005/005005 EP2005005005W WO2005111735A2 WO 2005111735 A2 WO2005111735 A2 WO 2005111735A2 EP 2005005005 W EP2005005005 W EP 2005005005W WO 2005111735 A2 WO2005111735 A2 WO 2005111735A2
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- WO
- WIPO (PCT)
- Prior art keywords
- applicator element
- roller
- component mixture
- colored
- layer thickness
- Prior art date
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0907—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with bias voltage
Definitions
- the invention relates to a method and an arrangement for coloring an applicator element of an electrophotographic printer or copier, in which a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles adhering to the outer surface of a roller is guided past a surface of an applicator element to be colored. When the two-component mixture is passed, at least some of the toner particles contained in the two-component mixture are transferred to the surface of the applicator element to be colored.
- the invention further relates to a printer or copier for producing multicolored images on a carrier material.
- the charge image is located on a photoconductor, for example on a photoconductor belt or a photoconductor drum.
- the toner material is usually electrically charged and adheres electrostatically to the surface of the applicator element.
- the layer thickness of the layer of toner material transferred to the photoconductor is not constant, in particular due to fluctuations in the layer thickness of the toner material layer on the applicator element.
- the fluctuations are caused by a change in the parameters of the two-component mixture, in particular by changes in the toner concentration, the tiboelectric charge and the two-component mixture resistance.
- fluctuations in the print quality are dependent on a change in parameters of the electrophotography process, in particular on the charging and discharging of the photoconductor.
- Such short and long-term fluctuations influence the print quality of the generated print images by different coloring of the print images to be generated. Additional fluctuations in the print quality are possible due to mechanical and electrical device settings of individual printing units or individual printing systems, which also causes fluctuations in the quality of the printed products which are superimposed on the fluctuations described above and can further intensify them.
- the charge images are not developed via an air gap as described above, but in direct contact with the photoconductor.
- the surface of the applicator element touches the surface of the photoconductor to be colored.
- a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles is used to produce a layer of toner particles on the surface of the applicator element, which layer adheres electrostatically to this surface.
- the two-component mixture is transported with the help of a so-called magnetic roller Inner magnetic elements are arranged stationary. The poles of these magnetic elements are aligned radially so that one pole of each magnetic element faces the roller surface. In the area of these poles, the magnetic field generates collections of the two-component mixture, since the ferromagnetic carrier particles are held in the area of the magnetic elements.
- Part of the surface of the magnetic roller can be passed through a so-called mixture sump of the developer station, as a result of which two-component mixture still adhering to the roller surface is rubbed off and new two-component mixture is deposited.
- the amount of the two-component mixture deposited on the roller surface can be limited using a doctor blade.
- So-called magnetic brushes form in the area of the poles, in particular a magnetic element being arranged in a fixed position opposite a point with the smallest distance between the magnetic roller and the applicator element in order to produce a magnetic brush there which at least touches the surface of the applicator element to be colored.
- the detachment of the toner particles from the ferromagnetic carrier particles and the attachment of the toner particles to the applicator roller can be promoted by applying a so-called auxiliary transmission voltage between the applicator element and the magnetic roller system.
- the layer thickness of the areas colored on the photoconductor is achieved by changing the electrophotography parameters, in particular the potential difference in the charge image between charged and discharged areas is increased and the bias voltage is changed.
- the charge image is then developed with a two-component magnetic brush, which creates a relatively thick toner layer on the photoconductor at the higher potential difference.
- this influence on the layer thickness inevitably affects other print quality parameters, e.g. Dot diameter, line widths, full-surface homogeneity and balance of negative and positive signs.
- two-component printing systems which, depending on the layer of toner material produced on the photoconductor, control the amount of toner which is fed to the two-component mixture.
- toner material is fed into the two-component mixture of the developer station as a function of the toner layer generated on the photoconductor.
- fresh toner is removed from a storage container, in particular special from a buffer, fed to the developer station.
- This increases the toner concentration in the two-component mixture in the developer station, which increases the ratio of toner particles and carrier particles in the two-component mixture and contains more toner particles in the magnetic brush that is used to color the photoconductor.
- this regulation primarily serves to feed the amount of toner material removed from the two-component mixture by coloring the charge images back into this mixture and to achieve a constant coloring of the print images generated.
- a flexible adjustment of the amount of toner used to develop the charging device is not possible because changes in the print image due to the supply or not supply of toner material only take effect after a large number of print images have been generated, and therefore only a relatively slow control option is given.
- a change in the inking intensity of the charge image can only be achieved with a simultaneous change in the print quality.
- the safe and clean depiction of single dots, the depiction of exact lines, the creation of smooth edges and the adherence to exact grids as well as a homogeneous full-surface coloring with an increase in the coloring negatively influences.
- a homogeneous coloring of areas to be colored can be achieved by a so-called saturated coloring with a high layer thickness of toner particles, dots are displayed too large and grids are not adhered to, so that in particular lines no longer have exactly straight edges.
- the dot size is adjusted with a rich coloring, the dots are displayed too small with a low coloring.
- the object of the invention is to provide a method and an arrangement for coloring an applicator element of an electrophotographic see printer or copier to specify, through which a desired preset layer thickness of toner particles on areas to be colored in the photoconductor is generated in a simple manner and a high quality of the printed image is guaranteed.
- This method according to the invention ensures that the layer thickness of the toner particle layer is set or regulated precisely to a preset value.
- the optical density of a print image to be generated can be set in a simple manner, in particular with the aid of further electrophotography parameters in further areas.
- the method according to the invention can also ensure that even when the properties of the two-component mixture change, in particular when the carrier particles age, a layer of toner particles on the surface of the applicator element with a constant, i.e. is generated with a preset layer thickness.
- a second aspect of the invention relates to a device for producing a toner particle layer with a preset layer thickness on the surface of an applicator element.
- This device has a roller, on the outer surface of which a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles adheres.
- the device comprises an applicator element, in the surface of which the two-component mixture adhering to the surface of the roller can be passed.
- the device comprises means for generating an electric field which exerts at least a force on a portion of the electrically charged toner particles of the two-component mixture, which is located between the surface of the roller and the surface of the applicator element to be inked.
- the device comprises means for changing the strength of the electric field in order to adjust the layer thickness of the toner particle layer formed by the toner particle transferred to the surface to be colored of the applicator element.
- a measuring arrangement for determining an actual value is also provided as a measure of the layer thickness.
- the device comprises means for comparing the determined actual value with a desired value determined by the preset layer thickness. The means for changing the strength of the electric field change and / or adjust the strength of the electric field depending on the deviation of the determined actual value from the target value.
- Such an arrangement ensures that the layer thickness produced on the surface of the applicator element reaches exactly a preset value.
- This preset layer thickness is achieved with the aid of the device according to the invention even if the mixture properties of the two-component mixture change due to the aging of the carrier particles or changed material properties of the toner particles.
- the arrangement according to the invention can thus achieve high print quality over a long period of time.
- the layer thickness produced on the surface of the applicator element is set or regulated exactly to the preset value, and the layer thickness can also be changed in a simple manner by changing the setpoint.
- a third aspect of the invention relates to a method for adjusting the degree of coloring one on one side of one Carrier material to be produced toner image in which a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles adhering to the outer surface of a roller is guided past a surface of an applicator element to be colored.
- the two-component mixture is passed, at least some of the toner particles contained in the two-component mixture are transferred to the surface of the applicator element to be colored.
- the toner particle layer produced by the transferred toner particles on the surface of the applicator element to be colored preset layer thickness is generated.
- the degree of coloring of the toner image to be produced on the side of the carrier material is set with the aid of further electrophotography parameters.
- This method according to the invention ensures that the layer thickness of the toner particle layer produced on the surface of the applicator element always has a constant preset layer thickness, the degree of coloring of the print image, which can be changed and preset in particular by changing the brightness setting of the print image to be generated, using an operating unit , is not set via the layer thickness of the toner particle layer produced on the surface of the applicator element, but rather via the further electrophotography parameters, for example via the dot size, the auxiliary voltage for transferring toner material from the surface of the applicator element to the areas of a photoconductor to be colored and / or from the auxiliary transfer voltage between the photoconductor and a substrate.
- the auxiliary transmission voltage is between the Photoconductor and this intermediate carrier and between the intermediate carrier and the carrier material also electrophotography parameters, by means of which the degree of coloring of the printed image, ie the brightness of the printed image, can be set and / or changed.
- the method according to the invention enables simple and more precise control of the brightness of the print image to be generated, ie the degree of coloring of the print image to be generated on the carrier material is easily adjustable.
- the constant layer thickness also ensures that a constant preset layer thickness can always be assumed for changing the degree of coloring of the toner image to be produced on the carrier material, as a result of which the brightness can be set independently of the layer thickness control or layer thickness regulation and thus more easily. A so-called drifting away of the brightness of the print images generated is avoided.
- a fourth aspect of the invention relates to a device for adjusting the degree of inking of a toner image to be produced on one side of a carrier material, which has a roller, on the outer surface of which a two-component mixture of electrically charged toner parts and ferromagnetic carrier particles adheres. Furthermore, the device comprises an applicator element, in the surface of which the two-component mixture adhering to the surface of the roller can be passed. Means are provided for generating an electric field with an adjustable field strength, the electric field exerting at least one force on a portion of the electrically charged toner particles of the two-component mixture between the surface of the roller and the surface of the applicator element to be colored.
- the toner particle layer produced on the surface of the applicator element to be colored by the toner particles transferred on this surface to be colored has a predetermined set layer thickness. Furthermore, the device comprises means for setting further electrophotography parameters for setting the degree of coloring of the toner image to be generated on the side of the carrier material.
- the degree of coloring of the toner image to be produced or the print image to be generated is changed and adjusted independently of the layer thickness produced on the surface of the applicator element.
- the layer thickness of the toner particle layer produced on the surface of the applicator element can be set independently of the further electrophotography parameters, as a result of which only the further electrophotography parameters need to be changed in a suitable manner in order to set the degree of coloring or the brightness.
- a constant preset layer thickness can be assumed. This enables the brightness or the degree of coloring to be set with high precision.
- the device according to the invention does not have any effects of signs of aging, in particular of the carrier particles of the two-component mixture, on the degree of coloring or on the brightness of the toner image / printed image generated on the carrier material.
- a fifth aspect of the invention relates to a method for coloring an applicator element of a printer or copier, in which a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles adhering to the outer surface of a roller is guided past a surface of an applicator element to be colored.
- a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles adhering to the outer surface of a roller is guided past a surface of an applicator element to be colored.
- the two-component mixture is passed, at least some of the toner particles contained in the two-component mixture are transferred to the surface of the applicator element to be colored. It becomes an electric field generated, which exerts a force on at least a portion of the electrically charged toner particles of the two-component mixture, which is located between the surface of the roller and the surface of the applicator element to be colored.
- This method according to the invention ensures that the optical density of the printed image produced can be adjusted within wide ranges in a simple manner, without other properties of the print quality, in particular without the dot diameter of individual dots, the line widths, the smoothness of the edges, the homogeneous full-surface coloring and the raster image to influence. Furthermore, the provision of an applicator element ensures that a layer of toner particles which has already been produced on the surface of the photoconductor is not damaged again by carrier particles.
- the method according to the invention enables, in particular, a continuous adjustment of the layer thickness of the toner particle layer produced on the applicator element and impairment of the printed image by so-called depletion effects is excluded.
- the change in the layer thickness independently of other printing parameters is achieved in particular by the fact that it is essentially only dependent on the set electric field strength.
- a constant print quality is achieved with an independent change in the coloring of the print image to be inked, as a result of which a significantly lower toner consumption and thus lower printing costs with a higher quality of the printed material is achieved.
- the process according to the invention does not require so-called overtoning of the latent charge image in order to ensure reliable coloring even of large areas.
- the method according to the invention ensures that other parameters of the electrophotography process, in particular the potential difference between charged and discharged areas of the photoconductor and the potential difference can be set between the applicator element and the photoconductor, regardless of the layer thickness of the toner material transferred to the photoconductor on the photoconductor with the aid of the applicator element.
- the layer thickness can be changed very quickly by changing the potential difference between the roller and the applicator element.
- the method according to the invention ensures that the electrophotography process is stabilized and that the print image produced is of high quality. Furthermore, the lifespan of the two-component mixture is increased, since an increase in the degree of coloring does not necessarily result in an increase in the proportion of toner particles in the two-component mixture.
- mixture parameters which change over the long term such as, for example, the mixture resistance
- the mixture parameters which change over the long term can also be compensated in a simple manner by increasing the electric field strength, as a result of which the period of use of the carrier particles is increased and costs of consumables are reduced.
- the layer thickness can also advantageously be regulated by detecting the coloring of a colored region of the printed image on the photoconductor or a subsequent carrier material with the aid of a sensor arrangement and adjusting the strength of the electric field depending on the detected degree of coloring.
- the degree of coloration detected by the sensor arrangement can be used to automatically set the basic coloration in the printer or copier.
- a sixth aspect of the invention relates to an arrangement for coloring an applicator element of an electrophotographic printer or copier.
- the arrangement contains a roller, on the outer surface of which a two-component mixture of electrically charged toner particles and ferromagnetic carrier particles adheres.
- the arrangement also includes an applicator element, on the surface of which the two-component mixture adhering to the surface of the roller can be passed.
- the arrangement also contains means for generating an electric field which acts at least on the part of the two-component mixture which is located between the surface of the roller and the surface of the applicator element to be colored, the electrical field when passing the two-component mixture at least a part of those present in the two-component mixture Transferring toner particles to the surface of the applicator element to be colored.
- a control unit controls the strength of the electric field in such a way that the transferred toner particles generate a preset layer thickness on the surface to be colored.
- the layer thickness of a layer of toner material to be applied to a photoconductor can be adjusted in a simple manner independently of further electrophotography parameters.
- the layer thickness of the toner layer produced on areas of a charge image to be colored is essentially independent of the potential difference between areas of the photoconductor to be colored and non-colored.
- carrier particles can also be used in the two-component mixture over a relatively long period of time, since a desired layer thickness of the toner layer generated on the applicator element can still be achieved by changing the strength of the electric field.
- This arrangement also enables a very rapid and flexible change in the layer thickness of the toner layer produced on the applicator element.
- a seventh aspect of the invention relates to a printer or copier for producing multicolored printed images on a carrier material which has at least two developer stations.
- the first developer station contains electrically charged toner particles of a first color and the second developer station contains electrically charged toner particles of a second color different from the first color.
- an applicator element is provided, on the surface to be colored in each case a toner particle layer is produced from the toner particles contained in the respective developer station with a preset layer thickness by a method according to the invention.
- Such a printer or copier can easily produce high-quality print images, since in particular in multi-color printing for producing mixed colors, the amounts of toner in the respective color separation are of crucial importance for the color of the mixed color.
- the applicator element arranged in the respective developer station on the surface to be colored has a defined layer thickness regardless of the aging of the carrier particles contained in the respective developer station.
- An eighth aspect of the invention relates to a printer or copier for producing multicolored printed images on a carrier material which has at least two developer stations.
- the first developer station contains electrically charged toner particles of a first color and the second developer station contains electrically charged toner particles of a second color different from the first color. Every developer station comprises an arrangement according to one of the preceding aspects.
- Such a printer or copier creates constant, preset layer thicknesses on the surface of the respective applicator element, as a result of which high-quality print images are also achieved in multi-color printing when several toner images are printed one above the other.
- Figure 1 shows an arrangement for coloring a photoconductor tape with the help of an applicator roller according to a first embodiment of the invention
- Figure 2 shows an arrangement for coloring a photoconductor tape with the help of an applicator roller according to a second embodiment of the invention.
- FIG. 1 shows a developer unit 10 for developing a charge image contained on a photoconductor belt 12.
- the photoconductor belt 12 is in the direction of arrow Pl driven at a substantially constant speed.
- the developer unit 10 contains an applicator roller 14, a magnetic roller 16 and a mixing wheel 18.
- the lower part of the mixing wheel 18 is located in the so-called mixture sump of the developer unit 10, which contains a two-component mixture of toner particles and carrier particles.
- the toner particles are electrically charged and adhere to the ferromagnetic carrier particles.
- the carrier particles essentially serve to transport the toner particles with the aid of the magnetic roller 16.
- the magnetic elements are permanent magnets, in particular natural magnets, which extend inside the roller 16 over its entire length.
- the longitudinal axes through the poles of the magnetic elements 22, 24, 26 are oriented radially, the south poles of the magnetic elements 22 and 26 being oriented toward the roller surface and the north pole of the magnetic element 24 toward the roller surface.
- the opposite poles of the magnetic elements 22, 24, 26 are not shown.
- so-called magnetic brushes are formed on the surface of the magnetic roller 16, by means of which raised collections of toner particles and carrier particles are formed in these areas.
- the ferromagnetic carrier particles are held together with the toner particles adhering to them in the area of the magnetic elements by the magnetic field of these magnetic elements 22, 24, 26 and are aligned along the field lines of the magnetic field, whereby the protruding brush shape is generated.
- the mixing wheel 18 is driven in the direction of the arrow P2, as a result of which the toner particles and carrier particles located in the mixture sump 20 are mixed, the toner particles being charged tiboelectrically by the friction generated during the mixing.
- the two-component mixture of Chen and carrier particles is flung up to the magnetic roller 16 or whirled up, whereby a part of the two-component mixture hits the surface of the magnetic roller 16 and is held in particular by the magnetic fields of the magnetic elements 22 and 24 on the surface of the magnetic roller 16.
- the mixture of toner particles and carrier particles is conveyed on the surface of the magnetic roller 16.
- the layer thickness of the layer of the two-component mixture located on the surface of the magnetic roller 16 is limited by a doctor blade 28.
- the magnetic roller 16 contains a metal sleeve 30 which is coated with a ceramic layer with a suitable roughness and has good adhesive properties for transporting the two-component mixture.
- the metal sleeve 30 is connected to a first potential of a DC voltage source DC1.
- the DC voltage source DC1 is infinitely adjustable, the voltage of the DC voltage source DC1 being set with the aid of a control unit.
- the applicator roller 14 contains a metal sleeve 32 which is connected to a second potential of the DC voltage source DC1. An electrical field is thus generated between the metal sleeve 32 of the applicator roller 14 and the metal sleeve 30 of the magnet roller 16, the electric field being strongest at the point 46 with the smallest distance between the applicator roller 14 and the magnet roller 16.
- the electric field between the applicator roller 14 and the magnetic roller 16 leads to the toner particles adhering to the carrier particles becoming detached from the carrier particles and being deposited on the surface of the applicator roller 14.
- the amount of the toner particles released from the two-component mixture and attached to the applicator roller 14 is dependent on the potential difference between the first potential a1 and the second potential, ie dependent on the voltage generated by the DC voltage source DC1.
- the toner particles attached to the surface of the applicator roller 14 adhere electrostatically to this surface.
- the layer thickness of the toner particle layer generated on the applicator roller 14 can be adjusted in a simple manner by the voltage set at the voltage source DC1.
- the photoconductor belt 12 is moved in the direction of the arrow P1, the applicator roller 14 being simultaneously driven in the direction of the arrow P4.
- the rotational speed of the photoconductor belt 12 and the rotational speed of the applicator roller 14 are essentially the same, so that there is no speed difference in the area of a transfer printing point 36 between the photoconductor belt 12 and the applicator roller 14.
- the areas of the charge image 34 to be inked are inked with toner material in the transfer printing area 36, essentially the entire layer of toner material located on the surface of the applicator roller 14, which lies opposite the area to be inked, is transferred to the photoconductor belt.
- the area 38 of the photoconductor belt 12 there is therefore a toner image on the photoconductor belt, which essentially corresponds to the print image to be produced.
- a toner image remains in the area 40 on the applicator roller 14, which corresponds to the negative of the printed image in the area 38. With the aid of a doctor blade 42, toner material still on the surface of the applicator roller 14 is scraped off the surface thereof.
- the photoconductor tape 12 contains an electrically conductive layer 44 which is connected to a second potential of a second DC voltage source DC2.
- the first potential of the DC voltage source DC1 is connected to the second potential in the DC voltage source DC1 and thus to the metal sleeve 32 of the applicator roller 14.
- FIG. 2 shows the developer unit 10 according to a second embodiment of the invention. The same elements have the same reference symbols. In contrast to the embodiment according to FIG. 1, in embodiment 2 a stationary counter electrode 48 with two electrode plates 50, 52 is arranged inside the applicator roller 14.
- the electrode plate 5 is arranged opposite the roller 16.
- the counter electrode 48 with the electrode plates 50, 52 is connected in the same way as the metal sleeve 32 according to the first embodiment according to FIG. 1 to the second potential of the DC voltage source DC1 and the first potential of the DC voltage source DC2.
- a plastic roller which does not contain a metal sleeve 32 can also be used as the applicator roller 14.
- an alternating voltage is superimposed on the direct voltage generated by the direct voltage source DC1, which is generated using an alternating voltage source AC1.
- the amount of the AC voltage generated by the AC voltage source AC1 is preferably infinitely adjustable with the aid of a control unit.
- the AC voltage generated by the AC voltage source AC1 serves, in particular, to ensure that the toner particles adhering to the carrier particles are detached from the carrier particles, in particular in the region 46, as a result of which the detached toner particles are drawn towards the surface of the applicator roller 14 with the aid of the DC voltage generated by the DC voltage source DC1 and adhere electrostatically to the surface of the applicator roller 14.
- the DC voltage generated by the DC voltage source DC2 is one of an AC voltage source. le AC2 generated alternating voltage superimposed.
- the toner particles are detached from the surface of the applicator roller 14 with the aid of the voltage generated by the AC voltage source AC1.
- the applicator roller can have a metal sleeve similar to the metal sleeve 32 according to FIG. 1, which serves as an electrode.
- the second electrode plate 52 is arranged in the interior of the applicator roller 14 in a stationary manner with respect to the transfer printing area 36.
- only one AC voltage source AC1 or AC2 can be provided.
- the carrier particles have a diameter of approximately 50 ⁇ m and are shown as circles in FIGS. 1 and 2.
- the toner particles have a diameter of about 7 ⁇ m and are shown as dots in Figures 1 and 2.
- the layer thickness generated on the applicator roller 14 can be controlled by changing the DC voltage DC1.
- the layer thickness of the toner particle layer produced on the applicator roller 14, on the photoconductor belt 12 or a subsequent carrier material, such as an endless transfer belt or a carrier material to be printed is subsequently determined, this determined layer thickness can be compared with a target value and, depending on the comparison result, the height of the DC voltage generated by the DC voltage source DC1 are controlled, whereby the layer thickness is regulated.
- the degree of inking of the toner particle layer produced on the applicator roller 14, the photoconductor belt 12 or a subsequent carrier material can be determined and compared with a desired value.
- the voltage source DC1 is driven by that on the applicator roller 14 layer thickness of the toner particle layer to be generated to the desired value.
- An optical sensor, a capacitive sensor and / or a laser triangulation sensor can be used as the sensor.
- the developer unit 10 When installed in an electrophotographic printer or copier, the developer unit 10 is preferably enclosed in a suitable housing.
- the developer stations 10 with applicator rollers 14 according to FIGS. 1 and 2 use a two-component magnetic brush to generate a layer of toner particles on the applicator roller 14 which adheres electrostatically to the applicator roller.
- the force vector of the electric field generated by the DC voltage DC1, which acts on the toner particles, is directed in the direction of the applicator roller 14.
- the air gap between applicator roller 14 and photoconductor belt 12 is used in the areas of the photoconductor belt to be developed, i.e. in the areas to be colored, the entire toner particle layer is transferred from the applicator roller 14 to the photoconductor belt 12. Only a very small remnant remains on the surface of the applicator roller 14 in this area, which is constant regardless of the toner layer deposited on the applicator roller 14.
- the layer thickness of the toner particle layer on the photoconductor belt 12 in the areas 38 to be colored is therefore independent of the auxiliary transmission voltage DC1.
- the strength of the electrical field of the DC voltage sources DC1 and DC2 is preferably infinitely adjustable, which enables a very variable layer thickness setting in a wide range.
- the printing material inking produced is preferably determined on the photoconductor belt as the actual inking.
- the DC voltage generated by the voltage source DC1 is changed with the aid of a control loop until the then determined actual coloring corresponds to the target coloring.
- the voltage of the DC voltage source DC1 is increased, as a result of which the amount of toner deposited on the surface of the applicator roller 14 and thus the amount developed on the photoconductor belt 12 increases and approaches the target inking.
- the voltage of the DC voltage source DC1 is reduced accordingly. As a result, process fluctuations can be reacted to quickly and flexibly, which is not possible due to the regulation of the subsequent feeding of toner material into the developer unit 10 described in the introduction to the description.
- the mixture parameters of the two-component mixture that change as a result of the aging of the carrier particles influence the toner accumulation on the carrier particles, but these are corrected by the described regulation of the layer thickness or the coloring, so that the charge images to be developed are colored in a constant quality.
- the carrier particles can also be used longer in the electrophotographic process in the developer unit 10 of the printer, as a result of which costs can be reduced.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Developing Agents For Electrophotography (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Dry Development In Electrophotography (AREA)
- Developing For Electrophotography (AREA)
- Color Electrophotography (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/579,243 US8401409B2 (en) | 2004-05-14 | 2005-05-09 | Method and arrangement for inking up an applicator element of an electrophotographic printer or copier |
EP05747766A EP1747501B1 (de) | 2004-05-14 | 2005-05-09 | Verfahren und anordnung zum einfärben eines applikatorelements eines elektrofotografischen druckers oder kopierers |
DE502005011282T DE502005011282D1 (de) | 2004-05-14 | 2005-05-09 | Verfahren und anordnung zum einfärben eines applikatorelements eines elektrofotografischen druckers oder kopierers |
CA002566360A CA2566360A1 (en) | 2004-05-14 | 2005-05-09 | Method and arrangement for inking up an applicator element of an electrophotographic printer or copier |
JP2007512057A JP2007537473A (ja) | 2004-05-14 | 2005-05-09 | 電子写真式の印刷機または複写機のアプリケータエレメントを着色する方法および装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102004024047.7 | 2004-05-14 | ||
DE102004024047A DE102004024047A1 (de) | 2004-05-14 | 2004-05-14 | Verfahren und Vorrichtung zum Einfärben eines Applikatorelements eines elektrofotografischen Druckers oder Kopierers |
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Publication Number | Publication Date |
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WO2005111735A2 true WO2005111735A2 (de) | 2005-11-24 |
WO2005111735A3 WO2005111735A3 (de) | 2006-01-05 |
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PCT/EP2005/005005 WO2005111735A2 (de) | 2004-05-14 | 2005-05-09 | Verfahren und anordnung zum einfärben eines applikatorelements eines elektrofotografischen druckers oder kopierers |
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Country | Link |
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US (1) | US8401409B2 (de) |
EP (1) | EP1747501B1 (de) |
JP (1) | JP2007537473A (de) |
CN (1) | CN100524078C (de) |
CA (1) | CA2566360A1 (de) |
DE (2) | DE102004024047A1 (de) |
WO (1) | WO2005111735A2 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007010275A1 (de) | 2007-03-02 | 2008-09-04 | OCé PRINTING SYSTEMS GMBH | Verfahren zum Drucken und Kopieren von Tonerbildern auf ein Trägermaterial mit Reduktion der Belichtung bei ausgewählten Bildelementen |
DE102007019311A1 (de) * | 2007-04-24 | 2008-11-06 | OCé PRINTING SYSTEMS GMBH | Vorrichtung und Verfahren zum Reinigen einer mit Tonerteilchen versehenen Trägeroberfläche |
US8472159B2 (en) * | 2008-09-02 | 2013-06-25 | Xerox Corporation | Method to charge toner for electrophotography using carbon nanotubes or other nanostructures |
DE102016107772B3 (de) * | 2016-04-27 | 2017-05-11 | Océ Holding B.V. | Verfahren zum Übertragen eines Tonerbildes von einem Transferelement auf einen Aufzeichnungsträger |
US10795281B2 (en) | 2017-08-24 | 2020-10-06 | Hp Indigo B.V. | Compensating voltages for electrophotography printing devices |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4686934A (en) * | 1984-10-29 | 1987-08-18 | Kabushiki Kaisha Toshiba | Developing device |
US4851872A (en) * | 1986-05-15 | 1989-07-25 | Minolta Camera Kabushiki Kaisha | Developing device with developer sleeve facilitating developer supply adjustment by bristle height regulating member |
US5030977A (en) * | 1990-02-15 | 1991-07-09 | Acuprint, Inc. | Printed image magnetic signal level control apparatus and method |
US5734955A (en) * | 1996-01-11 | 1998-03-31 | Xerox Corporation | Development system |
DE10137861A1 (de) * | 2001-08-02 | 2003-02-27 | Oce Printing Systems Gmbh | Verfahren zum Steuern eines Druckers oder Kopierers unter Verwendung eines Tonermarkenbandes sowie eines nach dem Triangulationsprinzip arbeitenden Reflexsensors |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5640862A (en) | 1979-09-11 | 1981-04-17 | Canon Inc | Developing device |
JPS58203468A (ja) * | 1982-05-21 | 1983-11-26 | Hitachi Metals Ltd | 乾式リ−ダ−プリンタ− |
JPH0493965A (ja) * | 1990-08-07 | 1992-03-26 | Ricoh Co Ltd | 現像装置 |
JPH09211970A (ja) * | 1996-02-07 | 1997-08-15 | Hitachi Ltd | 現像装置及びそれを用いたカラー電子写真装置 |
JP2000029255A (ja) * | 1998-07-10 | 2000-01-28 | Fuji Xerox Co Ltd | 画像形成装置 |
JP2000250276A (ja) * | 1999-03-04 | 2000-09-14 | Canon Inc | 現像装置及びこの現像装置を備える画像形成装置 |
US6285837B1 (en) * | 2000-09-25 | 2001-09-04 | Xerox Corporation | System for determining development gap width in a xerographic development system using an AC field |
DE10225182A1 (de) * | 2001-06-13 | 2003-01-23 | Kyocera Corp | Bildgebungsvorrichtung |
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 |
DE10204873C1 (de) * | 2002-02-06 | 2003-10-09 | Infineon Technologies Ag | Herstellungsverfahren für Speicherzelle |
US6868240B2 (en) * | 2002-03-15 | 2005-03-15 | Kyocera Corporation | Method for developing in hybrid developing apparatus |
JP2004021127A (ja) * | 2002-06-19 | 2004-01-22 | Canon Inc | 磁性トナー、該トナーを用いた画像形成方法及びプロセスカートリッジ |
JP2004054036A (ja) * | 2002-07-22 | 2004-02-19 | Ricoh Co Ltd | 現像装置及び画像形成装置 |
-
2004
- 2004-05-14 DE DE102004024047A patent/DE102004024047A1/de not_active Ceased
-
2005
- 2005-05-09 CN CNB2005800152145A patent/CN100524078C/zh not_active Expired - Fee Related
- 2005-05-09 US US11/579,243 patent/US8401409B2/en not_active Expired - Fee Related
- 2005-05-09 CA CA002566360A patent/CA2566360A1/en not_active Abandoned
- 2005-05-09 JP JP2007512057A patent/JP2007537473A/ja not_active Withdrawn
- 2005-05-09 DE DE502005011282T patent/DE502005011282D1/de active Active
- 2005-05-09 EP EP05747766A patent/EP1747501B1/de not_active Expired - Fee Related
- 2005-05-09 WO PCT/EP2005/005005 patent/WO2005111735A2/de active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4686934A (en) * | 1984-10-29 | 1987-08-18 | Kabushiki Kaisha Toshiba | Developing device |
US4851872A (en) * | 1986-05-15 | 1989-07-25 | Minolta Camera Kabushiki Kaisha | Developing device with developer sleeve facilitating developer supply adjustment by bristle height regulating member |
US5030977A (en) * | 1990-02-15 | 1991-07-09 | Acuprint, Inc. | Printed image magnetic signal level control apparatus and method |
US5734955A (en) * | 1996-01-11 | 1998-03-31 | Xerox Corporation | Development system |
DE10137861A1 (de) * | 2001-08-02 | 2003-02-27 | Oce Printing Systems Gmbh | Verfahren zum Steuern eines Druckers oder Kopierers unter Verwendung eines Tonermarkenbandes sowie eines nach dem Triangulationsprinzip arbeitenden Reflexsensors |
Non-Patent Citations (3)
Title |
---|
PATENT ABSTRACTS OF JAPAN Bd. 008, Nr. 055 (P-260), 13. März 1984 (1984-03-13) -& JP 58 203468 A (HITACHI KINZOKU KK), 26. November 1983 (1983-11-26) * |
PATENT ABSTRACTS OF JAPAN Bd. 016, Nr. 323 (P-1386), 15. Juli 1992 (1992-07-15) -& JP 04 093965 A (RICOH CO LTD), 26. März 1992 (1992-03-26) * |
PATENT ABSTRACTS OF JAPAN Bd. 1997, Nr. 12, 25. Dezember 1997 (1997-12-25) -& JP 09 211970 A (HITACHI LTD; HITACHI KOKI CO LTD), 15. August 1997 (1997-08-15) * |
Also Published As
Publication number | Publication date |
---|---|
EP1747501A2 (de) | 2007-01-31 |
WO2005111735A3 (de) | 2006-01-05 |
DE502005011282D1 (de) | 2011-06-01 |
CA2566360A1 (en) | 2005-11-24 |
US8401409B2 (en) | 2013-03-19 |
DE102004024047A1 (de) | 2005-12-08 |
JP2007537473A (ja) | 2007-12-20 |
CN100524078C (zh) | 2009-08-05 |
US20120039620A1 (en) | 2012-02-16 |
CN1977222A (zh) | 2007-06-06 |
EP1747501B1 (de) | 2011-04-20 |
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