EP1141787B2 - Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess - Google Patents

Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess Download PDF

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Publication number
EP1141787B2
EP1141787B2 EP99967019A EP99967019A EP1141787B2 EP 1141787 B2 EP1141787 B2 EP 1141787B2 EP 99967019 A EP99967019 A EP 99967019A EP 99967019 A EP99967019 A EP 99967019A EP 1141787 B2 EP1141787 B2 EP 1141787B2
Authority
EP
European Patent Office
Prior art keywords
toner
recording medium
intermediate image
image carrier
transfer
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
EP99967019A
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German (de)
English (en)
French (fr)
Other versions
EP1141787A1 (de
EP1141787B1 (de
Inventor
Heiner Reihl
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
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Application filed by Oce Printing Systems GmbH and Co KG filed Critical Oce Printing Systems GmbH and Co KG
Publication of EP1141787A1 publication Critical patent/EP1141787A1/de
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Publication of EP1141787B1 publication Critical patent/EP1141787B1/de
Publication of EP1141787B2 publication Critical patent/EP1141787B2/de
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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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
    • 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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0178—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image
    • G03G15/0189—Structure of complete machines using more than one reusable electrographic recording member, e.g. one for every monocolour image primary transfer to an intermediate transfer belt
    • 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
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • 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
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/23—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 specially adapted for copying both sides of an original or for copying on both sides of a recording or image-receiving material
    • G03G15/231—Arrangements for copying on both sides of a recording or image-receiving material
    • G03G15/238—Arrangements for copying on both sides of a recording or image-receiving material using more than one reusable electrographic recording member, e.g. single pass duplex copiers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00059—Image density detection on intermediate image carrying member, e.g. transfer belt

Definitions

  • the invention relates to a method and a device for controlling an electrographic printing or copying process. More particularly, the invention relates to a method and system for controlling toner concentration in a toner / developer mixture.
  • the toner mark is thus to make only relatively small, whereby the scanning surface and thus the measurement accuracy is limited, in particular transversely to the transport direction of the photoconductive drum or the recording medium.
  • it is sometimes useful to control a variety of parameters of the electrographic process apply a toner mark in the actual writing area of the photoconductor drum and scan. In particular when using sheet-shaped recording media, e.g. of so-called continuous paper, but then creates waste, because the so-printed record carrier for printing with other information is no longer available.
  • edge effects occur at the edges of a photoconductor, e.g. of the electric field, whereby the validity of a measurement in this area is weakened. The narrower a toner mark is, the more such edge effects overlap.
  • an electrophotographic printer which can process both recording medium with edge perforation and recording medium without edge perforation.
  • an aggregate with a friction drive is provided, which can be swiveled in and out of a photoconductor drum so precisely that the recording medium returns to its original position after swiveling off and on again with respect to the photoconductive drum.
  • the components described there are designed so that the pivoting on and off, for example, in the course of a service operation.
  • such a printer is suitable for printing a recording medium without edge perforation wider than a recording medium with edge perforation.
  • An edge hole-free recording medium can then be printed by the photoconductive drum in the region of the drum in which the edge perforation is located in the case of an edge-punched recording medium.
  • the information to be printed is produced as a toner intermediate image on an intermediate image carrier with a photoconductor drum and later in a transfer zone from a transfer printing surface, for example from the surface of the photoconductor drum or from a transfer transfer ribbon, to a recording medium transfer.
  • a toner mark is produced on the electrographic intermediate image carrier, the toner mark is scanned on the intermediate image carrier at least in regions, and the toner mark is subsequently removed again from the intermediate image carrier.
  • the density is scanned at the toner mark.
  • the toner concentration is then controlled with the measured value, in particular density value, in a developer station, so that the coloration can be kept constant.
  • a transfer of the toner intermediate image from the transfer printing surface to the recording medium is at least temporarily prevented.
  • This inhibition of the transfer is prevented in particular during a period by the toner mark passes the transfer zone.
  • the prevention of the transfer can be done in particular by separating / lifting the recording medium from the transfer printing surface.
  • the invention provides for the operation of an electrographic printing or copying device in particular two operating states.
  • the first operating state the so-called measuring cycle
  • a toner mark is produced on the intermediate image carrier
  • the density of the toner mark is scanned
  • the toner mark is then removed again from the intermediate image carrier.
  • the sampled toner density value is used to control the toner concentration in the developer station, and finds particular influence in a toner concentration set point and / or in a control threshold.
  • information to be printed is generated on the intermediate image carrier as a toner image and later transferred to the recording medium.
  • the toner concentration is controlled in particular with the toner concentration or control threshold determined from the first operating state.
  • the recording medium in the first operating state, is at least temporarily separated or lifted from the transfer printing surface, in particular from the intermediate image carrier.
  • the invention is therefore suitable for producing the toner mark on the intermediate image carrier in a region in which the information to be printed on the recording medium is also output.
  • the recording medium is in particular web-shaped and can be made of paper, for example.
  • an intermediate carrier on which the toner mark is produced in particular a photoconductor drum is provided.
  • the record carrier is separated from it for at least one revolution or lifted off.
  • a photoconductor belt is used as the first intermediate image carrier and / or a transfer belt as the second intermediate image carrier.
  • Information to be printed is generated on the first intermediate image carrier, then transferred to the transfer belt and finally transferred from the transfer belt to the recording medium.
  • density values of a plurality of toner marks can be used to determine the desired value in the toner concentration control.
  • the different toner marks may come from a plurality of measuring cycles which are far apart in time or may be formed in a continuous measuring cycle, in particular with one or more revolutions of the photoconductive drum.
  • a fast-switching, high-precision mechanical lifting device For separating the recording medium from the transfer printing surface, it is possible in particular to use a fast-switching, high-precision mechanical lifting device. In this case, it is particularly provided that the recording medium before lifting and after Wiederanschwenken with respect to the transfer station both in the transport direction and transverse to the transport direction in almost the same position.
  • an electrophotographic variable in the region of the transfer printing station is changed so that a transfer printing is prevented. For example, to reduce the electrical voltage on a transfer corotron.
  • the operating state in which the toner mark is generated and evaluated and no transfer to the Auyogsuch takes place is timed between the other operating state in which printing information is printed on the recording medium.
  • An advantage of the invention is in particular that the toner mark can be designed very wide, up to the entire width of the intermediate image carrier, such as a photoconductor drum. This allows the toner mark in particular after in the DE 198 01 521.6 be evaluated in several places.
  • the toner mark can also be positioned anywhere within the printing width of the intermediate image carrier. These capabilities not only increase the accuracy of measurement against narrow toner marks, but also provide the ability to use different methods of evaluating the toner brand rather than evaluating the toner density. For example, an evaluation of the shape of the toner mark produced is possible or its comparison with a desired shape. This further makes it possible to optimize the color toner evaluation methods. Different evaluation methods can be combined into one overall evaluation, eg color-specific evaluation methods differing with respect to the toner color and / or color-specific properties of the toner mark sensor are taken into account.
  • the toner marker's evaluation method can be designed with regard to its position, size and shape in such a way that independence from the toner color can be achieved. This is particularly true even in the case where an optoelectronic toner mark sensor operates in a narrow wavelength spectrum of light, e.g. only in one color, and its light has a direct effect on the reflection and absorption behavior of the toner pigments. In this case, in particular, the shape recognition of a large-area mark can be advantageously used.
  • toner marks are cyclically generated and scanned in relatively large page intervals in an electrographic process, for example only after a few thousand pages of printing.
  • the toner concentration then becomes otherwise, i. only based on other measured variables.
  • Such another measurand may e.g. the toner concentration measured in the developer station with a toner concentration sensor. From the measured value (toner density, toner mark shape, etc.) determined by the toner mark, a desired value is determined, e.g. for the toner concentration or for a control threshold and the toner concentration regulated with it.
  • This toner concentration control to be used in the intervals between the toner mark measurements in a developer station can be carried out in a manner known per se.
  • the toner post-discharge is otherwise controlled over relatively large print intervals (between the toner mark evaluation cycles).
  • the toner consumption can also be determined from the printed information, in particular the total number of printed pixels. This determination can also be made as a function of the contrast ratio set on the printing device, a specific transfer printing efficiency, the age of the toner / developer mixture, the type of toner and / or other influencing variables. With the sizes determined in this way, the toner supply to the developer station can then be regulated from a toner reservoir.
  • the object is achieved in the intervals between the formation and measurement of the toner mark to be able to carry out a largely independent control of toner coloration in an electrophotographic process.
  • FIG. 1 is a working according to the principle of electrophotography printing device 1 for web-shaped recording medium shown schematically.
  • the web-shaped recording medium in the form of a paper web 2 is thereby supplied by a drive unit 3 with a motor-driven friction roller 19 in the direction A 1 of a photoconductor drum 4.
  • the drive unit 3 and other components are the DE 197 49 651.2 to be taken into the present description.
  • the unit additionally contains movable pivot elements 15, with which the paper web 2 can be pressed against the surface of the photoconductor drum or lifted off it. They are automatically movable with an electric actuator 20, such as a stepper motor or lifting magnet.
  • suitable pivot elements are in the form of Umdruckschwingen for example from WO 97/17635 A1 known.
  • WO 97/17635 A1 may be designed like the rockers 40 and 44 shown in FIG. 5 of the WO publication, and may be mounted pivotably on axes in such a way that the paper web can be swiveled in and out of length-neutral with regard to parts of the drive assembly located farther away.
  • the content of WO 97/17635 A1 is also incorporated herein by reference.
  • the paper web 2 is printed in a transfer printing zone 5.
  • the photoconductive drum 4 which is driven by a motor, is acted upon by different, coupled aggregates with a toner intermediate image, which is transferred to the paper web 2 in the transfer printing zone 5.
  • a first unit is a character generator 6, which contains a light-emitting diode comb with individual controllable lighting elements and which, for example, according to WO 96/3782 A1 can be constructed.
  • the character generator 6 can be regulated by varying the drive voltage or the drive current in its light intensity.
  • An electronic control controls the individual LEDs according to the image information to be printed. at.
  • the loading station is adjoined by a charging sensor 7, which measures the surface potential on the photoconductive drum 4 and emits a signal in dependence thereon.
  • the image generated on the photoconductor 4 character dependent with the character generator 6 (charge image) is using a developer station 8 colored.
  • the developer station 8 contains a toner reservoir 9 for receiving toner and a metering device 10 in the form of a metering roller. Depending on the toner consumption, the metering roller 10 supplies toner to a mixing chamber 11.
  • In the mixing chamber 11 is a toner / developer mixture of ferromagnetic carrier particles and toner particles.
  • the toner mixture is fed to a developer roller 12.
  • the developer roller 12 acts as a so-called magnetic brush roller and consists of a hollow cylinder with magnetic strips arranged therein.
  • the developer roller 12 transports the developer mixture to a development nip 13 between the photoconductive drum 4 and the developer roller 12. Excess developer mixture is transported back to the mixing chamber 11 via the developer roller 12.
  • the toner mark sensor 14 is an optoelectronic scanner, which may be designed, for example, as a reflection light barrier. It consists of a light source and a phototransistor as a receiver. The output signal of the phototransistor is dependent on the reflectance of the applied on the photoconductor drum 4 and colored by the developer station information. With the sensor, in particular, a toner mark is scanned, which serves to determine the color saturation, ie the applied optical density of the toner mark. The wavelength of the reflection light barrier is selected so that the scanning light has no influence on the function of the photoconductive drum 4.
  • the toner brand is started when calling a test routine or automatically on a regular basis, for example after 2000 printed pages.
  • the toner mark then produced is scanned and the test pattern is evaluated, for example, in terms of color density and / or color saturation.
  • the paper web 2 is pivoted away from the photoconductor drum 4, so that it does not touch the surface 4a of the photoconductive drum 4 in the transfer printing zone 5.
  • the drive unit 3 or the pressure element 15 which presses the paper web 2 against the photoconductive drum 4 are then swung away from the photoconductive drum 4.
  • the cleaning station 16 is constructed in a conventional manner and contains, for example, a stripping element 17, which strips off the excess toner or the carrier particles from the photoconductive drum 4.
  • the cleaning process is assisted by a corona device 18.
  • further corona devices are provided in a manner known per se in the pressure device. These include, for example, a loading corotron, which is provided between the cleaning device 16 and the character generator 6. Exposure devices which serve to discharge the photoconductor drum 4 can also be arranged in the device. Further details of the electrophotographic process and the associated facilities are, for example, in the EP 403 523 B1 described.
  • FIG. 2 a device controller 25 of the electrographic printer is shown, which is connected to all electronic components of the various aggregates of the device, so that the processes can be coordinated with each other.
  • the device controller 25 is connected on the one hand to a controller 26, received in the print data to be printed and in pointwise converts the light emitting diodes of the character generator 6 controllable signals. These signals are transmitted to the controller 27 of the character generator.
  • the device controller 25 is connected to a controller 28 which controls electrophotographic parameters such as the voltages of corotron wires.
  • the photocell drum 4 scanning toner mark sensor 14 has electronic components 29, which are also in communication with the device controller 25.
  • the controller 30 of the developer station 8 exchanges data with the device controller 25 on two sides.
  • the toner concentration sensor 21, which measures the concentration of the toner in the toner / developer mixture in the mixing chamber 11 of the developer station 8, has an electronic assembly 31, which is also connected to the device controller 25.
  • the device control 25 is still connected to the electronic control 32 of the drive unit 3.
  • the controller 32 controls components 33 of the stepping motor which moves the paper web 2 and the electronic components 34 which activates the stepping motor 20 or a corresponding lifting magnet for the pressing elements 15.
  • the various pressure elements 15 may also be equipped with their own stepper motors or solenoids, so as to be able to accomplish an individual pressure of the rockers.
  • the device controller 25 is connected to an electronic unit 35, which effects the toner delivery from an external toner reservoir into the developer station. Within the developer station, further electronics can be provided which controls the metering of the toner from the toner reservoir 9 into the mixing chamber 11 by means of the metering roller 10.
  • step S5 a first operating state is shown in which printing data are transferred to the paper web 2.
  • step S1 it is checked if print data exists. If this is not the case, the printing device switches to a stand-by state, in which various units such as the photoconductive drum, transfer corotrons, the transport unit etc. are set to a low power consumption.
  • the device controller 25 receives a signal from the controller 26 that pressure data is available, it activates the aggregates involved, in step S3 the electro-photographic relevant aggregates and in step S4 the transport unit 3.
  • the servomotor 20 is activated by which the paper web 2 is pivoted to the surface of the photoconductor drum 4.
  • the drive motor is activated, which is the friction transport roller 19 is set to transport the paper web in motion.
  • the thus-printed toner image is fixed on the recording medium 2 in a fixing device.
  • the toner concentration in the developer station 8 is controlled by a toner concentration control.
  • the toner concentration in the developer station 8 is permanently detected and maintained by appropriate Nachêt with the conveyor 10, a constant toner developer mixture in the mixing chamber 11.
  • the toner concentration sensor 21 it is also possible to control the amount of toner per unit of time conveyed by the device 10 by counting the converted, set pixels in the controller 26 and / or other toner consumption determining quantities. such as use the contrast adjustment of the image, the temperature of the photoconductive drum or the like to determine the toner delivery amount.
  • the normal printing process is interrupted and a review of the current development conditions carried out using a toner mark.
  • first the paper web 2 in the transfer printing zone 5 is swiveled away from the surface of the photoconductive drum 4 by means of the pressing elements 15. The paper transport is also stopped.
  • step 59 the value of the page counter is stored in a memory of the printer controller 25.
  • the steps S12 to S17 describe a second operation state in which a toner mark is written on the photoconductor 4 and evaluated to modify the toner conveyance control which occurs during the transfer printing phase (S5) in the normal printing operation.
  • step S12 one or more toner marks are sequentially written on the photoconductive drum 4.
  • the toner marks may be generated during one revolution of the photoconductive drum or, alternatively, several toner marks over several revolutions of the photoconductive drum 4.
  • the toner marks are so wide as to enter the writing area of the photoconductive drum in which printing information is output during normal printing operation (step S5) normally be transferred to the paper web 2. If necessary, the toner mark can even extend over the entire width of the photoconductive drum 4.
  • Toner brands or marks produced in this way on the photoconductor drum 4 are scanned with the sensor 14 in step S13 and evaluated in the controller 25.
  • the evaluation may be made as to the toner density produced and / or the shape of the toner mark.
  • the toner brand (s) may have different densities and / or dimensions.
  • a value is then derived, which is compared in step S14 with a control threshold RS. If the toner density value OD of the toner marks is in the interval [RS- ⁇ , ..., RS + ⁇ ], the operating mode of the toner-mark printing may be aborted in step S17 and returned to the normal printing operation mode.
  • step S15 a toner delivery is initiated and a further toner mark is produced according to step S12.
  • This process (steps S12 to S15) is repeated until the coloring OD of the toner mark is in the required interval.
  • at least one correction value is determined from the operating mode of the toner mark generation in step S16, with which the regulation of the toner concentration in the normal printing phase (steps S S5 to S8) is adjusted. In particular, a control threshold for the toner concentration is changed.
  • the toner concentration control in the printing intervals that lie between the adjustment operating conditions in which toner marks are formed and evaluated for example, according to the in the US 4,468,112 A or US 5,387,965 A described method. Its contents are hereby incorporated by reference into the present specification.
  • the calibration operating state is doing From the measured toner density and the target value of the toner density, a difference is formed and the difference value used to determine a new toner concentration setpoint or a threshold for toner concentration control.
  • a toner density measurement factor uses a factor to change a toner concentration setpoint and / or a toner concentration control threshold.
  • the amount of toner delivered to the developer station per unit time can also be adjusted in step S12.
  • other parameters such as the sum of set (i.e., black pixels), the temperature of the photoconductive drum, or the adjusted image contrast may be taken into account for more precise control.
  • FIG. 4 a further printing device is described in which at least one latent image is generated on a photoconductor belt 122 in a first printing unit 150 by a first character generator 124.
  • a multiplicity of developer stations 126a, 126b,... 126e which contain toners of different colors, one or more toner intermediate images are produced on the photoconductor belt 122 in the direction of movement B.
  • This band is a carrier of a temporary image and is therefore called an intermediate image carrier.
  • latent images and toner intermediate images of different colors are generated by a second character generator 138 and a plurality of developer stations 140a to 140 in a second printing unit 152 on a second photoconductor belt 136 in the direction of movement D.
  • This printing device is in the German patent application DE 198 561 45.8 the applicant (internal sign 981101DE ) described in detail.
  • the intermediate toner images are transferred at a first transfer point 128 from the first photoconductor belt 122 to a first transfer belt 130 running in the direction C and correspondingly at a third transfer point 142 from the second photoconductor belt 136 to a second transfer belt 144 which moves in the direction E.
  • the transfer belts 130, 132 respectively collect the intermediate toner images of the different color separations and then print the full-color image on both sides, ie duplex, at a second transfer station 132 or a fourth transfer station 146 on the web-shaped recording medium 114.
  • the recording medium 114 driven by friction rollers 116 passes through a fixing station 118 in the transport direction A for fixing the two toner images and is then cooled in a cooling device 120.
  • FIGS. 1 to 3 Also in this device is in accordance with the in FIGS. 1 to 3 described embodiments with the present invention carried out an operating state in which a toner mark from the character generators 124 and 138 and at least one of the developer stations 126a to 126e and 140a to 140e on at least one photoconductor 122, 136 is generated.
  • the toner mark is then transferred to one of the transfer belts 130, 144, scanned thereon by one of the opto-electronic sensors 154, 156 and removed from the transfer belt without being printed on the paper web 114.
  • the two transfer belts 130 and 144 can be lifted off the paper web 114 in the region of the transfer printing stations 132 and 146, so that the transfer to the paper 114 can be prevented.
  • the toner mark can also be scanned on the photoconductor belts 122, 136 by corresponding sensors. Then either the transfer to the surfaces 130a, 144a of the transfer belt 130, 144 or the transfer to the paper web 114 is prevented.
  • correspondingly fast switching means are provided in the region of the transfer printing zones 132, 146 and / or 128, 142.
  • the invention has been described as having between approximately 2000 print pages of the second mode of operation between two toner mark evaluation cycles (i.e., between automatically starting the first mode), this number of pages may be varied depending on the given stability of the toner concentration control, i. be increased or decreased.
  • the coloration is determined in particular only by the toner concentration control, wherein at least one of its control variables, e.g. the control threshold of the toner concentration, determined by the first operating state, namely the generation of the toner mark.
  • This variant of the invention is therefore also to be regarded as a toner-brand-controlled toner concentration control.
  • the invention can also be used in a device for single sheets.
  • the prevention of the transfer in the operating state in which a toner mark is formed and evaluated may be e.g. done in the way that the supply of a sheet-shaped recording medium is completely suppressed to the transfer station.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)
EP99967019A 1999-01-05 1999-12-29 Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess Expired - Lifetime EP1141787B2 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19900164 1999-01-05
DE19900164A DE19900164A1 (de) 1999-01-05 1999-01-05 Verfahren und Einrichtung zur Regelung der Tonerkonzentration in einem elektrografischen Prozess
PCT/EP1999/010465 WO2000041038A1 (de) 1999-01-05 1999-12-29 Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess

Publications (3)

Publication Number Publication Date
EP1141787A1 EP1141787A1 (de) 2001-10-10
EP1141787B1 EP1141787B1 (de) 2004-02-25
EP1141787B2 true EP1141787B2 (de) 2010-03-24

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EP99967019A Expired - Lifetime EP1141787B2 (de) 1999-01-05 1999-12-29 Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess

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US (1) US6498909B1 (US07585860-20090908-C00136.png)
EP (1) EP1141787B2 (US07585860-20090908-C00136.png)
JP (1) JP4301735B2 (US07585860-20090908-C00136.png)
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DE10136259A1 (de) 2001-07-25 2003-02-20 Oce Printing Systems Gmbh Verfahren und Einrichtung zum Steuern eines Druckprozesses bei hoher Farbdichte
DE10233671A1 (de) * 2002-07-24 2004-02-05 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zum Einstellen der Tonerkonzentration in der Entwicklerstation eines elektrofotografischen Druckers oder Kopierers
DE10246736A1 (de) * 2002-10-07 2004-04-22 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zur Einstellung der Tonerzufuhr auf einen Mindestwert in eine Entwicklerstation einer elektrografischen Druck- oder Kopiereinrichtung
DE10246737A1 (de) * 2002-10-07 2004-01-15 OCé PRINTING SYSTEMS GMBH Verfahren zur Erzeugung eines neuen Träger und Toner aufweisenden Entwicklers in der Entwicklerstation einer elektrografischen Druck- oder Kopiereinrichtung
DE10250827B3 (de) 2002-10-31 2004-07-15 OCé PRINTING SYSTEMS GMBH Verfahren, Steuerungsschaltung, Computerprogrammprodukt und Druckgerät für einen elektrografischen Prozess mit temperaturkompensierter Entladetiefenregelung
DE102004005964A1 (de) * 2004-02-06 2005-09-08 OCé PRINTING SYSTEMS GMBH Steuerungseinrichtung und Verfahren zum Steuern eines elektrofotografischen Druckers oder Kopierers
US7350892B2 (en) * 2004-12-17 2008-04-01 Hewlett-Packard Development Company, L.P. Printing system and method of printing an image in a fixed head printing system
DE102006058579A1 (de) * 2006-12-12 2008-06-26 OCé PRINTING SYSTEMS GMBH Verfahren und Vorrichtung zum Verarbeiten eines Messsignals zum Erfassen einer Eigenschaft einer Tonermarke
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DE19900164A1 (de) 2000-07-27
EP1141787A1 (de) 2001-10-10
WO2000041038A1 (de) 2000-07-13
JP2002534715A (ja) 2002-10-15
JP4301735B2 (ja) 2009-07-22
US6498909B1 (en) 2002-12-24
EP1141787B1 (de) 2004-02-25

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